INCI · other · CIR review pending · used in 8 products
Polyisobutene
Polyisobutene is a synthetic polymer (a large molecule built from repeated subunits of 2-methyl-1-propene) used primarily in lip products such as lipsticks and lip glosses. It functions as a gloss improver and contributes stickiness that helps lip products adhere and stay on longer. When combined with polyacrylate-13 and polysorbate 20, it forms an effective thickener-emulsifier trio in formulations.
Evidence level
weakEWG score
—Comedogenic
—Category
other● Benefits
Improves gloss in lip products and enhances wear longevity through its adhesive properties. As part of a trio with polyacrylate-13 and polysorbate 20, it contributes to thickening and emulsification in cosmetic formulas.
viscosity-controllingfilm-forming
● Cautions
