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BUTYL ACRYLATE/STYRENE COPOLYMER.

Valuable CAS 25767-47-9 / FILM FORMING

A sophisticated polymer that forms protective films on the skin's surface while offering unique UV-enhancing properties through hollow sphere technology. This multi-functional ingredient excels at creating water-resistant barriers and significantly boosting sunscreen efficacy by scattering UV radiation. Its low irritancy profile and gentle nature make it suitable for various formulations across all skin types.

film former opacifying agent SPF booster water-resistance enhancer

Science

Creates flexible, uniform films on the skin surface that provide water-resistant protection while utilizing hollow sphere light-scattering technology to extend UV photon path length, thereby amplifying the effectiveness of existing UV filters


Research

High confidence
Effective range 1–5%
Optimal

1%

Key findings

  1. 01 1% concentration demonstrated 11-18% increase in SPF value through hollow sphere UV scattering technology
  2. 02 26-28% concentrations in aqueous dispersions showed stable film-forming properties without significant skin penetration

Transparency

Not commonly dusted

This functional polymer is used at effective concentrations rather than trace amounts for marketing purposes


The Formula

Solubility
Water
Optimal pH 6.5 – 7.5
0 7 14

Stability

Supplied as aqueous emulsion with 30-60% solids content; mechanically stable but sensitive to pH extremes and high electrolyte concentrations which may cause flocculation

Synergies

  • UV filters for SPF enhancement
  • Water-resistant formulation components

Conflicts

  • High concentrations of electrolytes/salts
  • Cationic surfactants
  • Strongly acidic environments below pH 5.0

Safety

CIR Status
Safe as used
Max tested
35%
Pregnancy
Safe
Sensitization risk Low

35% maximum applies to nail products; leave-on skin products typically use under 5%; insufficient data for nano-sized versions in leave-on products at 0.06%


Your Skin

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

Our Assessment

Valuable

A well-researched, multifunctional polymer that delivers measurable SPF enhancement and film-forming benefits with excellent safety and tolerability across all skin types.


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References