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ACRYLIC ACID/METHYLSTYRENE/STYRENE COPOLYMER.

Valuable / BINDING, NAIL CONDITIONING

ACRYLIC ACID/METHYLSTYRENE/STYRENE COPOLYMER is a versatile film-forming polymer engineered to enhance cosmetic formulations. It creates a breathable, continuous film on the skin, contributing to water resistance and a refined skin feel. This ingredient also plays a role in improving formula performance, particularly in sunscreens, and optically blurring skin imperfections.

Summary

film-forming opacifying water-resistant agent hydrating agent texture blurring mattifying agent SPF booster pigment binder

Science

Mechanism of Action

This copolymer operates by forming a pliable, cohesive, and continuous film upon application to skin or hair. This film acts as a physical barrier, enhancing the water resistance of formulations and binding water to boost skin hydration. Beyond film formation, it functions as an opacifying agent, improving product aesthetics, and possesses pigment-binding characteristics. In targeted applications, it diffuses light to reduce skin shine and imparts a desirable powdery feel, particularly beneficial for oily products. Furthermore, its film-forming properties help to visibly blur skin texture irregularities, including microreliefs, fine lines, wrinkles, and pores.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

1%

Key findings

  1. 01 At a 1% concentration, it has been observed to improve the SPF value of sunscreen formulations by approximately 11-18%.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 7 – 7.5
0 7 14

Stability

Film-forming acrylic copolymers demonstrate general compatibility across a broad spectrum of pH values, salt concentrations, and alcohol levels. Specific industrial applications note optimal stability when the pH during polymerization is adjusted to 8.0, with the final system pH ideally between 7.0 and 7.5.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The CIR Expert Panel has deemed acrylates copolymers, including related structures, safe for cosmetic use provided formulations are non-irritating. Its large molecular weight suggests a low likelihood of systemic absorption. While there is a recognized concern regarding potential residual styrene, a possible carcinogen, levels are meticulously minimized in compliant cosmetic grades. It is important to note that for nano-forms of Styrene/Acrylates copolymer, the SCCS was unable to conclude on safety due to insufficient toxicity data, even at a proposed maximum concentration of 0.06% in leave-on products. The EPA's exemption from tolerance requirements for similar styrene copolymers in pesticide formulations as inert ingredients further indicates a low risk, attributed to poor absorption.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

ACRYLIC ACID/METHYLSTYRENE/STYRENE COPOLYMER is a valuable ingredient, offering significant aesthetic and performance benefits such as enhancing SPF, blurring imperfections, and providing water resistance, all while maintaining a favorable safety profile for non-nano forms.

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