Chlorinated isobutylene-isoprene copolymer

Chlorinated isobutylene/isoprene copolymer. See Isobutylene/isoprene copolymer, chlorinated... 

Synonyms Butyl rubber, chlorinated Chlorinated butyl rubber Chlorinated isobutylene/isoprene copolymer Chlorobutyl rubber CNR... 

Establishments primarily engaged in manufacturing synthetic rubber by polymerization or copolymerization. An elastomer for the purpose of this classification is a rubber-like material capable of vulcanization, such as copolymers of butadiene and styrene, or butadiene and acrylonitrile, polybutadienes, chloroprene rubbers, and isobutylene-isoprene copolymers. Butadiene copolymers containing less than 50 percent butadiene are classified in Industry 2821. Natural chlorinated rubbers and cyclized rubbers are considered as semifinished products and are classified in Industry 3069. 

Butyl rubber, brominated. See Isobutylene/isoprene copolymer, brominated Butyl rubber, chlorinated. See Isobutylene/isoprene copolymer, chlorinated Butyl salicylate... 

Chlorinated butyl rubber. See Isobutylene/isoprene copolymer, chlorinated Chlorinated dioctyl terephthalate. See Dioctyl terephthalate chlorinated Chlorinated hydrochloric ether. See 1,1-Dichloroethane... 

Exxon Chlorobutyl 1065 Exxon Chlorobutyl 1066, Exxon Chlorobutyl 1068. See Isobutylene/isoprene copolymer, chlorinated ExxonMobil IPA. See Isopropyl alcohol ExxonMobil MEK. See Methyl ethyl ketone Exxpar451. See Paraffins, normal C5-20 Exx-Print 176 D Exx-Print 283 D. See Petroleum distillates, hydrotreated light Exx-PrInt 287 D. See Paraffins, normal C5-20 Exx-PrInt 588 D. See Petroleum distillates, hydrotreated middle... 

Polysar 3350-, Polysar 4220, Polysar 4300. See Polystyrene, high-impact Polysar Butyl 100-3 Polysar Butyl 302 Polysar Butyl XL-20, Polysar Butyl XL-10,00, Polysar Butyl XL 30102 Polysar Butyl XL 40302 Polysar Butyl XL 41106 Polysar Butyl XL 54006 Polysar Butyl XL 68102. See Isobutylene/isoprene copolymer Polysar Chlorobutyl 1240-Pharma. See Isobutylene/isoprene copolymer, chlorinated Polysar EPDM 227 Polysar EPDM 345 Polysar EPDM 346 Polysar EPDM 545 Polysar EPDM 585 Polysar EPDM 847X Polysar EPDM 847 Polysar EPDM 865 Polysar EPDM 965. See EPDM rubber... 

Isobutylene/isoprene copolymer Isobutylene/isoprene copolymer, brominated Isobutylene/isoprene copolymer, chlorinated D-Mannitol 2,2 -Methylenebis 6-(1-methylcyclohexyl)-p-cresol Natural rubber Oleyl alcohol... 

Isobutylene/isoprene copolymer, chlorinated rubber, aerospace components Fluorosilicone elastomer rubber, antivibration mounts Isobutylene/isoprene copolymer, chlorinated rubber, automotive EPM rubber... 

Isobutylene/isoprene copolymer, chlorinated rubber, food-contact Sperm oil... 

Bayer Chlorobutyl 1240 Bayer Chlorobutyl 1255 Exxon Chlorobutyl 1065 Exxon Chlorobutyl 1066 Exxon Chlorobutyl 1068 Isobutylene/isoprene copolymer, chlorinated Polysar Chlorobutyl 1240-Pharma 68081-96-9... 

Butyl rubber (HR) contains isobutylene as the parent material to which small proportions of butadiene or isoprene are added. Commercial butyl rubber may contain 5% butadiene as a copolymer. Chlorobutyl rubber (CIIR) is chlorinated isobutylene-isoprene. Both rubbers have the same general properties except that chlorobutyl rubber has a slightly higher allowable operating temperature. 

Exxon butyl rubber and its chlorinated analog, chlorobutyl rubber are isobutylene-isoprene copolymers. They are basically inert, nonpolar, stable elastomers which exhibit outstanding resistance to attack by a great many different chemicals. 

Butyl rubber and other isobutylene polymers of technological importance iaclude various homopolymers and isobutylene copolymers containing unsaturation achieved by copolymerization with isoprene. Bromination or chlorination of the unsaturated site is practiced commercially, and other modifications are beiag iavestigated. 

The most industrially significant polymerizations involving the cationic chain growth mechanism are the various polymerizations and copolymerizations of isobutylene. In fact, about 500 million pounds of butyl rubber, a copolymer of isobutylene with small amounts of isoprene, are produced annually in the United States via cationic polymerization [126]. The necessity of using toxic chlorinated hydrocarbon solvents such as dichloromethane or methyl chloride as well as the need to conduct these polymerizations at very low temperatures constitute two major drawbacks to the current industrial method for polymerizing isobutylene which may be solved through the use of C02 as the continuous phase. 

Butyl rubber consists mostly of isobutylene (95-98%) and about 2-5% isoprene units. 1 The isoprene unit is halogenated by either chlorine or bromine to obtain the corresponding halobutyl rubbers. Despite the superior elastomeric properties of halobutyl, the elastomer can easily undergo dehydrohalogenation leading to crosslinfang, and the isoprene unsaturation is subject to ozone cracking. To remedy these problems and to improve the halobutyl properties, a new class of elastomer poly(isobutylene-co-p-methylstyrene) [poly (IB-PMS)] was developed. Unlike butyl rubber, it contains no double bonds and therefore cannot be crosslinked unless otherwise functionalized. The chemical structures of butyl rubber and poly (IB-PMS) copolymers are shown below. 

Isobutylene has been of interest since the early days of synthetic polymer research when Friedel Crafts catalysts were used to prepare elastic materials. Isobutylene polymers of commercial importance include homopolymers and copolymers containing small amounts of isoprene or p-methylstyrene. Currently, chlorinated and brominated derivatives of butyl(poly[isobutylene-co-isoprene]) have the highest sales volume. 

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