Patent GB-591444-A (GB)
Title: Improvements relating to the curing of polymeric materials
IPC: C08K3/22
Filed: 1943-01-13
Abstract: Rubber-like copolymers of iso-olefins and diolefins prepared by low-temperature polymerization in the presence of a Friedel-Crafts' catalyst are cured by heating with a quinonoid substance of the benzene or naphthalene series with or without an oxidizing agent.  In a modification, a substance capable of forming on oxidation a quinonoid substance may be used and in this case an oxidizing agent is essential.  Suitable quinonoid substances are p-benzoquinone, p-quinone dioxime and tetrabromo-p-benzoquinone and the potentially quinonoid substance may be 2-amino-4-nitrophenol, p-phenylene diamine, p-aminophenol and a -naphthylamine.  Suitable oxidizing agents are lead dioxide, ferric oxide, magnetic iron oxide (Fe3O4), lead chromate, potassium dichromate or permanganate, manganese dioxide, red lead, zinc oxide, barium peroxide, benzoyl peroxide, nitrobenzenes, nitrophenols and tertiary amine oxides.  Copolymers specified are those of isobutylene with butadiene, isoprene, piperylene and dimethyl butadiene.  Curing may be effected at temperatures between 20 DEG  and 200 DEG  C.  There may also be present carbon black, zinc oxide, ferric oxide, mercuric oxide, magnesia, aluminium oxide, stearic acid, lead chromate, lithopone, clay, wood flour, asbestos and oil-soluble dyes.  Specifications 475,034 and 513,521 are referred to.  The Specification as open to inspection under Sect. 91 comprises also the use of simple polyisobutylene and a large number of quinonoid substances is given. This subject-matter does not appear in the Specification as accepted.ALSO:Rubber-like copolymers of iso-olefins and diolefins prepared by low-temperature polymerization in the presence of a Friedel-Crafts' catalyst are cured by heating with a quinonoid substance of the benzene or naphthalene series with or without an oxidizing agent.  In a modification, a substance capable of forming on oxidation a quinonoid substance may be used and in this case an oxidizing agent is essential.  Suitable quinonoid substances are p-benzoquinone, p-quinone dioxime and tetrabromo-p-benzoquinone and the potentially quinonoid substance may be 2-amino-4-nitrophenol, p-phenylene diamine, p-aminophenol and a-naphthylamine.  Suitable oxidizing agents are lead dioxide, ferric oxide, magnetic iron oxide (Fe3O?), lead chromate, potassium dichromate or permanganate, manganese dioxide, red lead, zinc oxide, barium peroxide, benzoyl peroxide, nitrobenzenes, nitrophenols and tertiary amine oxides. Copolymers specified are those of isobutylene with butadiene, isoprene, piperylene and dimethyl butadiene.  Curing may be effected at temperatures between 20 and 200 DEG C.  There may also be present carbon black, zinc oxide, ferric oxide, mercuric oxide, magnesia, aluminium oxide, stearic acid, lead chromate, lithopone, clay, wood flour, asbestos and oil-soluble dyes.  Specifications 475,034 and 513,521, [Group IV], are referred to.  The Specification as open to inspection under Sect. 91 comprises also the use of a large number of other quinonoid substances. This subject-matter does not appear in the Specification as accepted.