Database/Viscosity Controlling/Isobutylene/Isoprene Copolymer
100% petroleum · ISO 16128

Is Isobutylene/Isoprene Copolymer natural?

No. Synthetic butyl-rubber-type copolymer of isobutylene and isoprene (or butadiene), both petrochemical olefins either way.

INCI nameIsobutylene/Isoprene Copolymer
CAS9010-85-9
FunctionViscosity Controlling
FeedstockMade by cationic copolymerisation of isobutylene with a…

How we scored it

CAS 9010-85-9 = butyl rubber (isobutylene/isoprene copolymer); CosIng text ('1,3-butadiene') appears mismatched with the INCI name, but both possible comonomers are petrochemical C4/C5 olefins → 0.0.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Made by cationic copolymerisation of isobutylene with a small fraction of isoprene, both from petroleum/natural-gas cracking. Not derived from natural rubber.

In plain English

A film-forming and thickening polymer, essentially synthetic butyl rubber, made from two petrochemical building blocks.

CosIng definition: 1,3-Butadiene-, polymer with 2-methyl-1-propene

Natural alternatives with the same function

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References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2ISOBUTYLENE/ISOPRENE COPOLYMER. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3ISOBUTYLENE/ISOPRENE COPOLYMER. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=ISOBUTYLENE/ISOPRENE%20COPOLYMER