HYDROGENATED STYRENE/ISOPRENE COPOLYMER

CAS Number	68648-89-5
Chem/IUPAC Name:	Benzene, ethenyl-, polymer with 2-methyl-1,3-butadiene, hydrogenated
EINECS/ELINCS No:	607-504-5 / 614-693-8
COSING REF No:	56675

Hydrogenated styrene or hydrogenated styrene isoprene copolymer is a synthetic, large-sized polymer, that works to control the viscosity and forms a film in cosmetics and personal care products. It has a molecular weight of 172.27 and its chemical formula is C₁₃H₁₆.

Who supplies HYDROGENATED STYRENE/ISOPRENE COPOLYMER ?

KRATON

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What is HYDROGENATED STYRENE/ISOPRENE COPOLYMER used for?

Hydrogenated styrene/isoprene copolymer primarily serves as a viscosity-increasing, opacifying, and film-forming agent. It can stabilize water-in-oil emulsions (W/O) along with adding texture to the formulation. It is usually found in various cosmetic formulations like sun care, color cosmetics, especially in hand and body sprays, face powders, etc.

Origin

Hydrogenated styrene isoprene copolymer is made by anionic polymerization, which results in little or no residual monomer in the polymer. The final result of controlled hydrogenation of styrene/isoprene copolymer is hydrogenated styrene/isoprene copolymer.

What does HYDROGENATED STYRENE/ISOPRENE COPOLYMER do in a formulation?

Emulsion stabilising
Film forming
Opacifying
Viscosity controlling

Safety profile

According to the Cosmetic Ingredient Review (CIR) Expert Panel, hydrogenated styrene is safe under the present practices of use and concentration in cosmetics. The panel agreed that it is unlikely that styrene would be absorbed through the skin due to the large size of its molecules. The panel's assessment of the safety of these polymers as they are used in cosmetics was adequately supported by the lack of any potential for percutaneous absorption and the negative findings of toxicity tests. Given the large size of the styrene molecules, the panel agreed that percutaneous absorption is unlikely. The absence of potential for percutaneous absorption and the negative results of toxicity tests provided the panel with a sufficient basis to assess the safety of these polymers as they are used in cosmetics.

HYDROGENATED STYRENE/ISOPRENE COPOLYMER Alternatives

HYDROGENATED STYRENE BUTADIENE COPOLYMER, ETHYLENE PROPYLENE STYRENE COPOLYMER, BUTYLENE ETHYLENE STYRENE COPOLYMER

Technical profile

Property	Values
Boiling Point	145.2°C at 760 mmHg
Melting Point	95°C
Solubility	Soluble in alcohol, ether, methanol, acetone, and carbon disulfide; sparingly soluble in water