Patent GB-617779-A (GB)
Title: After-treatment of copolymers
IPC: C08F8/02
Filed: 1946-01-15
Abstract: Copolymers of aromatic olefins such as styrene, p-brom styrene, a -methyl styrene, p-methyl styrene, a -methyl-p-methyl styrene and p-methoxy styrene, with aliphatic olefins such as isobutylene, isoamylene, methyl-2-butene-2, iso-octylene, propylene, n-butylene and ethylene prepared at below 0 DEG  C. in the presence of a Friedel-Crafts catalyst, are reacted with halogenated hydrocarbons or olefins at an elevated temperature in the presence of a Friedel-Crafts catalyst.  The copolymer may also contain up to 40 per cent of a conjugated polyolefin such as butadiene, isoprene, cyclopentadiene, myrcene or ocimene.  Halogenated hydrocarbons specified are ethylene dichloride, propylene dichloride and like bromo-compounds, trichlorotrifluoro propylene and the dimer and trimer thereof, difluoroethane, carbon tetrachloride, carbon tetrafluoride, 1-chloro-1, 1-difluoro ethane, chloropentafluoro-ethane, hydrocarbons such as paraffin wax, cetane, octadecane, tri-isobutylene, polymethyl pentadiene, polypropylene, polybutene, polyethylene, petrolatum, naphtha, kerosene, gas oil or butyl rubber, which have been halogenated, e.g. chlorinated, methyl chloride or bromide, ethyl bromide or fluoride, isopropyl chloride, n-, sec- and tert.-butyl chloride, amyl and/or hexyl chlorides, iso-octyl chloride, 1-fluoro-2-methyl propane, lauryl chloride or fluoride and octadecyl chloride. Alkylating olefins specified are isobutylene, propylene, ethylene, amylenes, di-isobutylene, or non-cracking dehydrogenation products of paraffin wax.  The reaction is preferably carried out in the presence of a solvent such as benzene, toluene, aromatic or aliphatic naphthas, carbon tetrachloride or tetrachlorethane. The products of the alkylation may be mixed with paraffin wax, white oils, halogenated wax, asphalts, greases, Diesel oils, kerosene, naphthas, or light white oils used for hydraulic fluids, styrene-isoprene copolymers, cyclo-polybutadiene, cyclized deproteinized natural rubber, chlorinated cyclized natural rubber, polyesters, shellac, terpene resins, coumarone resins, phenol-formaldehyde resins, cyclopentadiene adduct of maleic acid, polymethyl methacrylate, polyvinyl chloride and/or acetate, polystyrene, cellulose acetate, polysilicones, polythene, natural or synthetic rubbers (GR-N and GR-S), polymethyl pentadiene, polybutadiene, polypropylene, polyisobutylene, linseed, fish or soyabean oils, carbon, sulphur, aluminium or copper powder, titanium dioxide, zinc oxide or stearate, zinc superdimerate, aluminium stearate, chlorinated polyisobutylene or styrene-isobutylene copolymer, ground leather, barium sulphite, chalk, glass wool, chlorinated polystyrene, copolymers of styrene-isobutylenedienes, halogenated rubbers, lithium stearate, iron or lead oxide, molybdenum, titanium phosphite, halogenated polymethylpentadiene and tin oxide.  The alkylated copolymers may also be used as pour-point depressors in conjunction with sulphurized mahogany soaps, polyisobutylene and other specified compounds.  If the alkylated products are prepared from unsaturated terpolymers they may be treated with sulphur chlorides to give rubbery gels. Specification 513,521 is referred to.ALSO:Synthetic and natural rubbers are compounded with an alkylated copolymer of an aliphatic olefin and an aromatic olefin (see Group IV(a)).  In an example 10 per cent of an amylated styrene-isobuty-lene copolymer was mixed with a rubbery isobutylene-isoprene copolymer and then vulcanized by heating with the usual aids.  In another example an amylated styrene-isobutylene copolymer was mixed with 95 per cent of a rubbery isobutylene-dimethyl butadiene copolymer.  Specification 513,521 is referred to.