Description

Styrene/Stearyl Methacrylate Crosspolymer is a synthetic, film-forming copolymer designed to deliver exceptional texture and stability in advanced formulations. This versatile polymer is engineered to act as a key rheology modifier and film former, providing a unique combination of water resistance, flexibility, and a luxurious skin feel. It is an essential ingredient for manufacturers in the personal care and cosmetic industries seeking to enhance the performance and sensory profile of their products, from long-wearing makeup to high-end skincare.

Application

• Waterproof Cosmetics: A primary film-former in mascara, eyeliner, and foundation to provide exceptional smudge and water resistance.
• Long-Wear Makeup: Used in lipsticks, lip glosses, and color cosmetics to improve wear time, color payoff, and transfer resistance.
• Sun Care & Skincare: Imparts water-resistant properties to sunscreens while contributing to a smooth, non-greasy application in moisturizers and serums.
• Hair Styling Products: Provides strong hold, flexibility, and humidity resistance in gels, waxes, and styling sprays.
• Nail Care: Enhances the durability, chip resistance, and gloss of nail lacquers and coatings.
• Color Cosmetic Suspensions: Acts as a stabilizer and suspending agent for pigments and powders in various anhydrous and emulsion systems.

Basic Information

Product Name	Styrene/Stearyl Methacrylate Crosspolymer
CAS No.	91838-84-5
Molecular Formula	(C10H12O2.C22H42O2)x
Molecular Weight	Not applicable (Polymer)
Synonyms	Styrene/Stearyl Methacrylate Copolymer; Stearyl Methacrylate/Styrene Copolymer; Poly(Styrene-Co-Stearyl Methacrylate); SMA Copolymer (Stearyl Methacrylate Type); Film-Forming Polymer S/SA; 2-Propenoic acid, 2-methyl-, octadecyl ester, polymer with ethenylbenzene; Octadecyl 2-methylprop-2-enoate polymer with ethenylbenzene
EINECS	Contact for details

Quality Control

Our Styrene/Stearyl Methacrylate Crosspolymer is manufactured under strict quality management systems. Each batch is tested to ensure consistent purity, particle size, and performance characteristics relevant to cosmetic applications. We provide comprehensive Certificates of Analysis (COA) with key parameters including assay, residual monomers, and heavy metal content, supporting compliance with global cosmetic ingredient regulations (e.g., EU Cosmetics Regulation, FDA).

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from heat sources and open flame. Under these conditions, the product has a typical shelf life of 24 months from the date of manufacture.

Specification

Item	Specification
Appearance	White to off-white powder or beads
Identification (IR)	Conforms to standard
Assay (as Polymer)	≥ 98.0 %
Residual Monomers	≤ 0.1 %
Loss on Drying	≤ 2.0 %
Particle Size (Typical)	Passes through 80 mesh
Heavy Metals (as Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.