Innovative polymers for cosmetics. Beauty Made Possible.

Covestro Deutschland AG Business Unit Coatings, Adhesives, Specialties D-51368 Leverkusen www.baycusan.com cosmetics@covestro.com This information and our technical advice whether verbal, in writing or by ways of trial are given in good faith but without warranty, and this also applies where proprietary rights of third parties are involved. The information is provided by Covestro without assumption of any liability. If any of the above mentioned regulations change after the date of declaration, this declaration is no longer valid. Covestro will strive to keep this information up-to-date. Our advice does not release you from the obligation to verify the information provided especially that contained in our safety data and technical information sheets, to check for updates of any information provided by us and to test our products as to their suitability for the intended processes and uses. The application, use and processing of our products and the products manufactured by you on the basis of our technical advice are beyond our control and, therefore, entirely your own responsibility. Our products are sold in accordance with the current version of our General Conditions of Sale and Delivery. Edition: 2018-03 Order-No.: COV00084332 Printed in Germany Innovative polymers for cosmetics. Beauty Made Possible. 2018 Technical Brochure

»There is a road from the eye to the heart that does not go through the intellect.«around the world, notions of beauty are as colorful as the people who pursue them. There is certainly more than just one kind of beauty, and everybody has their own idea of what beauty involves. Although personal definitions may differ, one aspect remains the same: everyone wants to be beautiful in some way. And that s what Baycusan is all about enabling individual beauty through your products. Baycusan is your key ingredient for creating products that enable people to be as beautiful as they would like to be. We are passionate about inventing products for you and together with you that expand the possibilities for being beautiful. We like to keep raising the bar, re-inventing and perfecting, so that in the end it s not just products but Beauty Made Possible. Contents Baycusan product portfolio 04 Key features 06 SunCare 08 SkinCare 16 ColorCosmetics 24 HairCare 32

Baycusan product portfolio The Baycusan product portfolio features water-based polyurethane polymers and ethanolbased polyurethane polymers all carefully developed for superior performance. Baycusan INCI Name Solids [%] Avg. particle size [μm] ph Viscosity [mpa s] C 1000* Polyurethane-34 40.0 ± 2.0-7.5 ± 1.0 500 C 1001* Polyurethane-34 32.0 ± 2.0-7.5 ± 1.0 1000 Water-based polymers C 1003* Polyurethane-32 50.0 ± 2.0-7.5 ± 1.0 1000 C 1004* Polyurethane-35 41.0 ± 2.0-7.5 ± 1.0 500 C 1008* Polyurethane-48 30.0 ± 2.0-7.0 ± 1.5 < 1000 C 1010 Polyurethane-35 40.0 ± 2.0-7.0 ±1.0 1000 Ethanolbased polymer C 2000 Polyurethane-64 40.0 ± 5.0 - - < 10000 Applications Baycusan SkinCare SunCare HairCare ColorCosmetics C 1000* C 1001* C 1003* C 1004* C 1008* C 1010 C 2000 * Also commercially available with 1.5% antimicrobial additive under the name Baycusan C/1. especially suitable suitable 4

Key features SunCare SkinCare ColorCosmetics HairCare (Salt) water resistance Sweat resistance Sand resistance Helps to reduce eye irritation Wet skin application SPF boosting Comfortable wear Protects the skin against air pollutants Easy & gentle peel-off with no skin irritation Facilitates longer-lasting retention of actives on the surface of the skin Enhances efficacy of active ingredients Rub-off resistance Comfortable wear Water resistance Sweat resistance Rub-off resistance Non-transfer Comfortable wear Even color coverage Styling Strong hold Wash resistance Waterproofing Style retention No tackiness Natural feel Care Heat protection Frizz control for up to 24 hours Anti-breakage Effectively reduces length of split ends Conditioning and detangling effect 6

The sun makes the world blossom and look great. Let s keep it that way. SunCare with Baycusan.

Water resistance As confirmed by in vivo tests conducted in accordance with guidelines established by the European Cosmetics Association (see fig.1), water resistance can be achieved in different formulation types with Baycusan C 1000 and Baycusan C 2000, whereas Baycusan C 1004 imparts an even longer water resistance to emulsion-based formulations. By using the stabilization properties of water-based Baycusan polymers (Baycusan C 1000 and Baycusan C 1004) in an emulsion-based product, the emulsifier or polymeric stabilizer concentration can be reduced to avoid product re-emulsification on contact with water. 2x20 min. immersion 4x20 min. immersion 45 SunCare 40 35 37.2 41.3 41.8 Key features (Salt) water resistance Sweat resistance Sand resistance Helps to reduce eye irritation Wet skin application* SPF boosting Comfortable wear * Applicable to Baycusan C 2000 In vivo SPF 30 25 20 23.2 22.8 32.3 31.8 23.0 Recommended raw materials Trade Name Baycusan C 1000* Baycusan C 1004* Baycusan C 2000 INCI Name Polyurethane-34 Polyurethane-35 Polyurethane-64 Chemical description Physical properties Trade name Baycusan C 1000* Baycusan C 1004* Baycusan C 2000 suitable Appearance White, low viscosity liquid White, low viscosity liquid Transparent, low viscosity liquid Solid content 40.0 ± 2.0 41.0 ± 2.0 40.0 ± 5.0 Viscosity at 23 C 500 1000 < 10000 ph 7.5 ± 1.0 7.5 ± 1.0 - * Also commercially available with 1.5% antimicrobial additive under the names Baycusan C 1000/1 and Baycusan C 1004/1. 10 Water-based polyurethane polymer (40% polymer, 60% water) Water-based polyurethane polymer (41% polymer, 59% water) Ethanol-based polyurethane polymer (40% polymer, 60% ethanol) Ingredient category Film forming Film forming Film forming Application area Emulsionbased (lotion, cream) (Hydro-)alcoholicbased (spray, aerosol, gel) Oil-based 15 10 5 0 Emulsion 1 with 7.5% Baycusan C 1000 Static SPF SPF after water immersion Ethanol spray with 5% Baycusan C 2000 Figure 1: In vivo SPF data before and after immersion Oil spray with 5% Baycusan C 2000 Emulsion 2 with 7% Baycusan C 1004 Emulsion 1: Emulsion stabilized with 0.15% acrylates/c10-30 alkyl acrylates crosspolymer (Pemulen TR-2, Lubrizol) and containing 4% OMC + 4.5% BMDBM + 4% BEMT (RR 8023) Emulsion 2: Emulsion stabilized with 1% polyglyceryl-6 stearate (and) polyglyceryl-6 behenate + 0.10% acrylates/c10-30 alkyl acrylates crosspolymer (Pemulen TR-2, Lubrizol) containing 5% BMDBM + 5% OS + 10% OMC + 5% EHT + 10% OCR (RR 8136) Ethanol spray: Ethanol solution containing 4.9% BMDBM + 2% BEMT + 10% OCR + 3% DHBT + 5% OS + 10% HMS Oil spray: Oil formulation containing 5% BMDBM + 3.5% BEMT + 10% OCR +5% DHBT + 5% OS + 10% HMS (RR 8096) Abbreviations: BMDBM: Butyl methoxydibenzoylmethane DHHB: Diethylamino hydroxybenzoyl hexyl benzoate OCR: Octocrylene OS: Ethylhexyl salicylate HMS: Homosalate EHT: Ethylhexyl triazone BEMT: Bis-ethylhexyloxyphenol methoxyphenyl triazine BP-3: Benzophenone-3 OMC: Ethylhexyl methoxycinnamate DHBT: Diethylhexyl butamido triazone 11

Control of UV filter migration SPF-boosting effect The migration of sun care formulations on skin was found to be a source of eye irritation and less effective protection. In vivo tests demonstrated that the addition of Baycusan C 1000 in an emulsion-based formulation inhibits the migration rate of UV filters across the skin. As shown in Figure 2, at 7.5 wt.% as supplied, Baycusan C 1000 film former inhibits the average migration rate of an emulsion-based sun care formulation stabilized with low molecular emulsifiers by more than 60% over the blank formulation. An emulsifier-free formulation with the same Baycusan concentration shows even better results: the inhibition of UV filter migration increases from 62% to 78% after about 2 hours. The addition of Baycusan C film formers in a sun protection formulation significantly increases the sun protection factor (SPF) under special conditions. SPF measurements have shown that Baycusan C film formers are selective SPF boosters with the UVB filters octocrylene and ethylhexyl triazone and with broadband UV filters such as bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) and benzophenone-3. As shown in Figure 3, sun care formulations containing a combination of the above mentioned UV filters with other commonly used UV filters show analogous SPF-boosting effects. 0,7 Emulsion-based products with 7.5 wt% Baycusan C 1000 Emulsion-based products with 5 wt% Baycusan C 1004 Ethanol-based products with 4.9 wt% Baycusan C 2000 Quicker migration Migration rate after 120 min (sq.mm/mg/min) 0,6 0,5 0,4 0,3 0,2 0,1-62% -78% In vivo SPF 120 100 80 60 40 20 21.6 32.6 25.6 58.7 77.0 96.0 22.6 35.0 26.9 51.6 0 0 Classical emulsion Emulsifier-free formulation RR 8020 RR 8022 RR 8163 RR 8091 RR 8094 Control 7.5 % Baycusan C 1000 Figure 2: Migration rate of a sun care formulation after 2 hours application Without film former With Baycusan product Figure 3: In vivo SPF data for formulations with and without Baycusan C1000 RR 8020: 3% BMDBM + 10% OCR + 5% OS +10% HMS RR 8022: 5% OS + 13% HMS + 7% OCR + 4% BP-3 + 3% BMDBM RR 8163: 5% OS +6% DBT + 2% BEMT + 4% BMDBM + 2% DHHB + 3% EHT RR 8091: 4% BMDBM + 7% HMS + 7% OCR + 2% BEMT + 5% EHS RR 8094: 2% BMDBM + 15% HMS + 2% OCR + 6% BP-3 + 5% EHS Abbreviations: BMDBM: Butyl methoxydibenzoylmethane DHHB: Diethylamino hydroxybenzoyl hexyl benzoate OCR: Octocrylene OS: Ethylhexyl salicylate HMS: Homosalate EHT: Ethylhexyl triazone BEMT: Bis-ethylhexyloxyphenol methoxyphenyl triazine BP-3: Benzophenone-3 12 13

Wet skin application Ethanol-based sun care formulations using Baycusan C 2000 as film former can be applied on wet skin without leaving white traces. About 70% of the static SPF value measured on dry skin can be retained after application of the formulation on wet skin, as shown in Figure 4. 35 32.8 30 26.4-74% 25-71% 24.3 In vivo SPF 20 15 18.8 10 5 0 Ethanol spray with 4 % Baycusan C 2000 Ethanol gel with 4 % Baycusan C 2000 SPF on dry skin SPF on wet skin Figure 4: In vivo SPF data on dry and wet skin Ethanol spray: containing 10% HMS + 5% OS + 1.5 % EHT + 3.8% BMDBM + 2% DHBT + 7% OCR Ethanol gel: containing 10% HMS + 5% OS + 5% BMDBM + 2,5% DHBT + 6% OCR Abbreviations: HMS: Homosalate OS: Ethylhexyl salicylate EHT: Ethylhexyl triazone BMDBM: Butyl methoxydibenzoylmethane DHBT: Diethylhexyl butamido triazone OCR: Octocrylene

Our skin is like a delicate pearl. Let s treasure its beauty with gentle passion. SkinCare with Baycusan.

SkinCare Peel-off effect Key features Protects the skin against air pollutants Easy & gentle peel-off with no skin irritation Facilitates longer-lasting retention of actives on the surface of the skin Enhances efficacy of active ingredients Rub-off resistance Comfortable wear Baycusan C 1001 and Baycusan C 1004 enable the formulation of peel-off masks (a). After about 10 minutes, a wet peel-off formulation containing 30 wt% Baycusan C 1001 as supplied forms a clear continuous film on the skin (b). If water is then applied to the treated skin, the product film turns white (c) and can be easily peeled off in one piece (d), as illustrated in figure 5. Recommended raw materials Trade name Baycusan C 1000* Baycusan C 1001* Baycusan C 1004* INCI name Polyurethane-34 Polyurethane-34 Polyurethane-35 Chemical description Water-based polyurethane polymer (40% polymer, 60% water) Water-based polyurethane polymer (32% polymer, 68% water) Water-based polyurethane polymer (41% polymer, 59% water) Ingredient category Film forming Film forming Film forming a b Face care products Application area Face masks Body care Hand/foot care suitable c d Physical properties Trade name Baycusan C 1000* Baycusan C 1001* Baycusan C 1004* Appearance White, low viscosity liquid White, low viscosity liquid White, low viscosity liquid Figure 5: Peel-off mask application Solid content 40.0 ± 2.0 32.0 ± 2.0 41.0 ± 2.0 Viscosity at 23 C 500 1000 1000 ph 7.5 ± 1.0 7.5 ± 1.0 7.5 ± 1.0 * Also commercially available with 1.5% antimicrobial additive under the names Baycusan C 1000/1, Baycusan C 1001/1, and Baycusan C 1004/1. 18 19

Anti-pollution effect When incorporated into skin care formulations, Baycusan C 1004 forms a highly flexible and breathable invisible film that mimics the movement of skin, without any tightening sensation. This film acts as a barrier to air pollutants, especially respirable particular matter smaller than 2.5 µm (so-called PM 2.5). Baycusan C 1004 reduces the absorption of air pollutants, thus preventing damage from external aggressors and early skin aging. To demonstrate the barrier properties of Baycusan C 1004, absorption of PM 2.5 was measured by covering the inlet of a PM-meter with a cotton piece treated with a gel formulation placed in a saturated atmosphere of PM 2.5. Figure 6 shows that if the concentration of Baycusan C 1004 is increased, the concentration of PM 2.5 measured decreases significantly, while the barrier properties of the product film are also clearly improved. 80 71.4 70 60-47% -61% PM 2.5 value [ µg/m 3 ] 50 40 30 37.7 27.8-81% 20 13.8 10 0 Without Baycusan C 1004 1% Baycusan C 1004 3% Baycusan C 1004 5% Baycusan C 1004 Figure 6: Measurement of the barrier properties of Baycusan C 1004 19

Enhancing the efficacy of active ingredients Baycusan C film formers can significantly improve the efficacy of skin care formulations. In vivo studies demonstrate that Baycusan C 1000 supports the controlled release of actives such as salicylic acid into the stratum corneum, consequently reducing the high irritation potential of salicylic acid. The influence of Baycusan C 1000 on the efficacy of acne treatment was evaluated in vivo on the backs of subjects suffering from acne by applying the test formulation for four consecutive days. The results (see fig. 7) demonstrate that Baycusan C 1000 produces a greater improvement in the acne symptoms than treatment with the control formulation: a significant reduction in redness, inflammation. % of inflammation reduction 80 70 60 50 40 30 20 10 0 Day 1 Day 2 Day 3 Day 4 Base formulation (blank) 2% salicylic acid 5% Baycusan C 1000 + 2% salicylic acid Figure 7: Inflammation reduction Another in vivo study shows that Baycusan C 1004 improves the moisturizing effect of hyaluronic acid. As illustrated in Figure 8, the hydration level of stratum corneum measured with a cornometer is significantly higher when Baycusan C 1004 is added into the formulation. Change from baseline after 5 hours [%] 250 200 150 100 50 0 101.9% 160.8% 193.6% Base formulation (blank) 1% hyaluronic acid 1% hyaluronic acid + 5% Baycusan C 1004 Figure 8: Corneometry measurements 23

Color is one of life s amazing wonders. Let s celebrate its pure joy. ColorCosmetics with Baycusan.

ColorCosmetics Key features Water resistance Sweat resistance Rub-off resistance Non-transfer Comfortable wear Even color coverage Recommended raw materials Trade name Baycusan C 1000* Baycusan C 1004* INCI name Polyurethane-34 Polyurethane-35 Chemical description Water-based polyurethane polymer (40% polymer, 60% water) Water-based polyurethane polymer (41% polymer, 59% water) Ingredient category Film forming Film forming Mascara Eyeliner Eyeshadow Application area Liquid foundation Powder foundation Make-up base Lipstick and lipgloss Nail polish suitable Physical properties Trade name Baycusan C 1000* Baycusan C 1004* Appearance White, low viscosity liquid White, low viscosity liquid Solid content 40.0 ± 2.0 41.0 ± 2.0 Viscosity at 23 C 500 1000 ph 7.5 ± 1.0 7.5 ± 1.0 * Also commercially available with 1.5% antimicrobial additive under the names Baycusan C 1000/1 and Baycusan C 1004/1. 26

Water resistance Non-transfer properties Since Baycusan C 1004 imparts superior wet rub-off resistance to color cosmetics formulations, it is an excellent choice for formulating waterproof and rub-off-resistant mascaras, eyeliners and liquid foundations. The excellent rub-off resistance properties of a mascara formulation (RR 8017) are demonstrated in figure 9. The evaluation of non-transfer properties was conducted in vivo by spreading a fixed amount of foundation onto the forearm of volunteers under controlled conditions. After drying, the volunteers left an imprint of their forearm on a sheet of absorbing paper. As shown in figure 10, the imprints left from different foundation formulations containing Baycusan C 1004 are significantly lower than standard formulations without Baycusan C 1004. Before test: O/W Baycusan C 1004 No film former Standard Baycusan C 1004 Test: W/O Warm tap water 10 seconds gentle rubbing Standard Baycusan C 1004 After test: W/S Baycusan C 1004 No film former Standard Baycusan C 1004 Figure 9: Rub-off resistance Figure 10: Results of imprints 28 29

Peel-off properties in water-based nail polish formulations Baycusan C 1004 makes durable water-based nail polish formulations possible. The application of the nail polish is easy, color coverage good and removal facilitated by the excellent film-forming properties of Baycusan C 1004. As shown in figure 11, the nail polish can be easily peeled off by lifting the edge at the side of the nail and pulling it off. Figure 11: Peel-off of the nail polish formulation containing Baycusan C 1004 30 31

Hair can be the mirror of one s soul. Let s polish and protect it and keep it in balance. HairCare with Baycusan.

SunCare SkinCare ColorCosmetics HairCare HairCare Key features Styling Strong hold Wash resistance Waterproofing Style retention No tackiness Natural feel Care Heat protection Frizz control up to 24 hours Anti-breakage Effectively reduces length of split ends Conditioning and detangling effect Recommended raw materials Trade name Baycusan C 1001* Baycusan C 1008* Baycusan C 1010 Polyurethane-34 Polyurethane-48 Polyurethane-35 Chemical description Water-based polyurethane polymer (32% polymer, 68% water) Water-based polyurethane polymer (30% polymer, 70% water) Water-based polyurethane polymer (40% polymer, 60% water) Ingredient category Film forming Film forming Film forming INCI name Application area Hair styling Elasticity is one of the key characteristics of Baycusan film formers. Compared to traditional fixative polymers, Baycusan polymers form exceptionally flexible films on hair. Figure 12 shows SEM images of single knotted hair fibers coated with an acrylate copolymer and Baycusan C 1001. Under stress, the acrylate copolymer film becomes very brittle, while the Baycusan C 1001 film remains smooth and shows no cracking. Baycusan C 1001 Acrylates copolymer Figure 12: SEM images of single knotted hair fiber Aerosol and pump hair spray Setting lotion, cream and gel cream Aerosol and pump mousse Hair care Hair treatment Leave-on conditioner suitable Physical properties Trade name Baycusan C 1001* Baycusan C 1008* Baycusan C 1010 Appearance White, low viscosity liquid White, low viscosity liquid White, low viscosity liquid Solid content 40.0 ± 2.0 30.0 ± 2.0 40.0 ± 2.0 500 1000 1000 7.5 ± 1.0 7.0 ± 1.0 7.0 ± 1.0 Viscosity at 23 C ph * Also commercially available with 1.5% antimicrobial additive under the names Baycusan C 1001/1 and Baycusan C 1008/1. 34 35

Styling: Strong hold Styling: Humidity resistance Figure 13 shows a comparison of flexural strength tests (2 wt% active polymer in aqueous solution, 50% relative humidity, 21 C). Baycusan C 1010 imparts strong holding power as good as state-of-the-art styling copolymers, such as PVP-K90. Baycusan C 1001, Baycusan C 1008 and Baycusan C 1010 provide excellent high humidity curl retention for styling formulations even better than market-leading styling polymers. As shown in figure 14, curl retention is measured as a function of time at 90% humidity and 25 C. Caucasian dark-brown hair tresses were treated with an aqueous solution of Baycusan C 1001, Baycusan C 1008 and Baycusan C 1010 at a concentration of 2 wt% active. Maximum bending force [cn 70 60 50 40 30 20 10 0 45 Baycusan C 1001 49 Baycusan C 1008 Figure 13: Results of flexural strength test 1 VP/methacrylamide/vinyl imidazole copolymer 63 Baycusan C 1010 56 PVP (K90) 28 VP/VA Copolymer (ratio 70/30) 53 VP copolymer 1 High humidity curl retention (%) 120 100 80 60 40 20 0 0 50 100 150 200 250 300 350 400 Time (min) Figure 14: Results of high humidity curl retention Baycusan C 1010 Baycusan C 1008 Baycusan C 1001 VP/VA copolymer (ratio 70/30) PVP (K90) VP/methacrylamide/vinyl imidazole copolymer

Styling: Wash resistance Baycusan C 1008 enhances the wash resistance properties of styling formulations. Hair styled with a Baycusan C 1008-based formulation keeps its shape after immersion in warm water, and even after shampooing. Figure 15 below shows the wash resistance of curly hair tresses (treated with an aqueous solution of film former at a concentration of 2 wt% active and straightened with a flat iron) before and after washing with a silicone-free commercial shampoo. After two shampoo cycles, Baycusan C 1008 clearly exhibits better wash resistance towards shampoo compared to an acrylate copolymer, and prevents straightened curly hair turning frizzy again when wet. Before treatment: After treatment with polymer solution: After two shampoo cycles: Acrylates copolymer Acrylates copolymer Baycusan C 1008 Baycusan C 1008 Figure 15: Wash resistance test results 38

Styling: Style retention Care: Heat protection The exceptional mechanical properties of Baycusan C 1010 result in excellent style retention. Figure 16 below illustrates the change in curl retention after running fingers through the curl (curl snap test). After they are run through ten times, Baycusan C 1010 clearly exhibits a better curl retention than PVP (K90). Before test: After test: Loss of lustrous shine, split hair ends and hair breakage are annoying features of hair damaged by styling tools, such as blow dryers, curlers and straightening irons, which can reach temperatures of up to 230 C. Baycusan C 1008, a polymer that is stable up to 270 C, forms a protective coating on hair fiber so the hair feels revived, soft and non-sticky. Electron microscope images of hair fibers (see fig. 18) that have been regularly treated with a straightening iron over a long period of time show significant differences compared to conventional heat protection products. The thin, highly elastic Baycusan C 1008 film protects hair against overheating. It expands with the hair under the influence of high temperatures and shrinks again during cooling, preventing fractures forming on the surface of the hair fibers. Cuticle split Breakage Baycusan C 1010 PVP (K90) Baycusan C 1010 PVP (K90) Breakage Cuticle split Figure 16: Curl snap test results Unprotected Hair Protected with Baycusan C 1008 (RR 8068) Protected with a commercial product containing VP/VA Copolymer Figure 18: SEM images of hair fibers after applying heat, scale 10 µm The curl snap test was repeated after placing the hair tresses in 90% relative humidity for one hour. As shown in figure 17, even at high humidity, Baycusan C 1010 provides significantly a better style retention than PVP (K90), making it suitable for dry and humid climatic zones. Before test: After test: Baycusan C 1010 PVP (K90) Baycusan C 1010 PVP (K90) Figure 17: Curl snap test results at 90% relative humidity 40 41

Care: Frizz control up to 24 hours Baycusan C 1008 adds long-lasting frizz control to leave-on formulations, providing significant volume reduction up to 24 hours even at 90% relative humidity (see fig. 19). With leave-in conditioners, silicone oil is often used to achieve this effect. However, Baycusan polyurethane dispersions also enable silicone oil-free formulations to form a protective film on the hair fibers. The film s non-greasy texture gives hair a flexible feel and breathtaking shine. Care: Detangling effect Volume (%) 80 70 60 50 40 Baycusan C1001 has a conditioning and detangling effect on hair, as the tips can then be easily separated. Figure 20 indicates that, on average, 37% less force is needed to comb through hair tips treated with Baycusan C 1001 than in untreated hair. And it is significantly harder to comb through hair treated with other technologies. -10.8% Dimethicone 30-9.0% Competitive polyurethane 20 0 1 2 3 4 5 6 7 8 Time (h) Acrylate copolymer 2 16.6% Acrylate copolymer 1 12.3% 8066 Base control Base + VP/VA Copolymer Base + Baycusan C1008 Figure 19: Volume of frizzy hair as a function of time: 8 h under 90% RH -37.8% Baycusan C 1001-50.0% -40.0% -30.0% -20.0% -10.0% 0.0% 10.0% 20.0% Figure 20: Relative change in combing force between untreated and treated hair (at the hair tip) 43