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What (who) is butyl rubber - definition

SYNTHETIC RUBBER; A COPOLYMER OF ISOBUTYLENE WITH ISOPRENE

Halobutyl rubber

butyl rubber

¦ noun a synthetic rubber made by polymerizing isobutylene and isoprene.

Butyl rubber

Butyl rubber, sometimes just called "butyl", is a synthetic rubber, a copolymer of isobutylene with isoprene. The abbreviation IIR stands for isobutylene isoprene rubber.

https://en.wikipedia.org/wiki/Butyl_rubber

Butyl group

ANY 4-CARBON ALKYL GROUP

Tert-butyl; Isobutyl; T-Bu; I-Bu; S-Bu; C4H9; -Bu; T-butyl; Sec-Butyl; Tert-Butyl; N-Butyl; Secondary butyl; Tertiary butyl; Tert Butyl; T-butyl cation; T-Butyl; Tertiary Butyl; Sec-butyl; Tertiary butyl group; Butyl; N-butyl; Tert-butyl group; Isobutyl group

In organic chemistry, butyl is a four-carbon alkyl radical or substituent group with general chemical formula , derived from either of the two isomers (n-butane and isobutane) of butane.

https://en.wikipedia.org/wiki/Butyl_group

Wikipedia

Butyl rubber

Butyl rubber, sometimes just called "butyl", is a synthetic rubber, a copolymer of isobutylene with isoprene. The abbreviation IIR stands for isobutylene isoprene rubber. Polyisobutylene, also known as "PIB" or polyisobutene, (C₄H₈)_n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based. Butyl rubber is produced by polymerization of about 98% of isobutylene with about 2% of isoprene. Structurally, polyisobutylene resembles polypropylene, but has two methyl groups substituted on every other carbon atom, rather than one. Polyisobutylene is a colorless to light yellow viscoelastic material. It is generally odorless and tasteless, though it may exhibit a slight characteristic odor.

https://en.wikipedia.org/wiki/Butyl rubber