Patent GB-1087286-A (GB)
Title: Cross-linkable polymeric compositions
IPC: C04B24/24
Filed: 1966-08-31
Abstract: A cross-linkable polymeric composition comprises a polymer having a saturated carbon chain and substituted directly thereon from 0.25 to 12.5 equivalents of carboxylic acid groups per 100 carbon atoms in the chain, a water-hydrolysable co-crystallized oxide which, on hydration, liberates sufficient base to neutralize from 10 to 100% of said carboxylic groups, and a curing amount of a polyepoxide containing at least two epoxide groups, each of which is capable of reacting with ionized carboxylic acid groups under the conditions of cure, and/or an organic peroxide. The oxide is preferably present in amount of from 2 to 100 parts by weight per 100 parts of the polymer. A preferred polymer is a copolymer of an ethylenically unsaturated hydrocarbon monomer and an a ,b -ethylenically unsaturated carboxylic acid, particularly ethylene-acrylic or methacrylic acid copolymers. Preferably the co-crystallized oxide comprises at least one oxide of a base-forming alkali or alkaline earth metal and at least one amphoteric oxide particularly calcium and/or magnesium oxide and silica and/or alumina. A particularly preferred co-crystallized oxide is Portland cement.  The preferred polyepoxide is vinyl cyclohexane diepoxide and the preferred peroxide is dicumyl peroxide.  The compositions may be cross-linked by contacting with water when the cross-linking agent is a polyepoxide and by heating above the boiling-point of water and then contacting with water when the agent is a peroxide.  Also used in the examples are limonene diepoxide, the diepoxide of bisphenol A, carbon black, 2,5-bis(tert.-butyl peroxy) - 2,5 - dimethyl - hexane, chloroprene - acrylonitrile - methacrylic acid terpolymer, MgO.SiO2 and MgO.Al2O3.SiO2.ALSO:A cross-linkable polymeric composition comprises a polymer having a saturated carbon chain and substituted directly thereon from 0.25 to 12.5 equivalents of carboxylic acid groups per 100 carbon atoms in the chain, a water-hydrolysable co-crystallized oxide which, on hydration, liberates sufficient base to neutralize from 10 to 100% of said carboxylic groups, and a curing amount of a polyepoxide containing at least two epoxide groups, each of which is capable of reacting with ionized carboxylic acid groups under the conditions of cure, e.g. vinyl cyclohexanone diepoxide, and/or an organic peroxide, e.g. dicumyl peroxide.  The oxide is preferably present in amount of from 2 to 100 parts by weight of the polymer.  A preferred polymer is a copolymer of an ethylenically unsaturated hydrocarbon monomer and an a ,b -ethylenically unsaturated carboxylic acid, particularly ethylene-acrylic or methacrylic acid copolymers. Preferably the co-crystallized oxide comprises at least one oxide of a base-forming alkali or alkaline-eart metal and at least one amphoteric oxide particularly calcium and/or magnesium oxide and silica and/or alumina, e.g. Portland cement.  Also used in the examples are limonene peroxide, the diepoxide of bisphenol A, carbon black, 2,5-bis(tert.-butyl peroxy)-2,5-dimethyl-hexene, chloroprene-acrylonitrile-methacrylic acid terpolymer, MgO.SiO2 and MgO.Al2O3.SiO2.