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Page 1 of 8 The use of CRODABOND CSN in Sun Care Formulations for SPF Boosting Disclosed by Croda Europe Limited Introduction CRODABOND CSN (INCI: Hydrogenated Castor Oil/Sebacic Acid Copolymer) is a 100% natural (ISO 16128), readily biodegradable and vegan suitable material available from Croda. This material is known for having film-forming properties which have been shown to provide hair care claims such as immediate and long-lasting split end repair and cuticle sealing. Crodabond CSN’s wax content provides structural integrity, while its polymeric nature delivers superior film-forming capabilities. These characteristics make it a viable natural alternative to petrochemical-based ingredients like polybutene, commonly used for shine and adhesion in colour cosmetics. Its film-forming action can create a seal between the product and skin, enhancing wear time and minimizing transfer or smudging—ideal for long-wear formulations. Crodabond CSN Emulsion Properties Crodabond CSN can be used in different types of emulsions: oil-in-water (O/W), water-in-oil (W/O), water-in-silicone (W/Si), multiple emulsions such as water-in-oil-in-water (W/O/W) and others and can be added either to the oil phase, water phase or after homogenization of the emulsion under mixing. It can also be used in gel and anhydrous formulations. For anhydrous systems, the incorporation can happen at any point of the formulation. Crodabond CSN may be used in combination with a wide range of other cosmetic ingredients in formulation such as emollients/oils and waxes. Examples of emollients/oils and waxes include: avocado oil, C12-15 alkyl benzoate, C12-15 alkyl ethylhexanoate, C12-15 alkyl lactate, C12-15 alkyl salicylate, C13-14 isoparaffin, C18-36 acid glycol ester, C18-36 acid triglyceride, caprylic/capric glycerides, 20 caprylic/capric triglyceride, caprylic/capric/lauric triglyceride, caprylic/capric/linoleic triglyceride, caprylic/capric/myristic/stearic triglyceride, caprylic/capric/stearic triglyceride, castor oil, castor oil-silicone ester, cetearyl ethylhexanoate, cetearyl isononanoate, cetearyl palmitate, cetearyl stearate, cetyl dimethicone, cetyl dimethicone copolyol, cetyl ethylhexanoate, cetyl glycol isostearate, cetyl i...