Improvements in or relating to polymerisable unsaturated compositions

摘要

Unsaturated compounds containing the group > C = C < are polymerized in the presence of 0,002 to 2% of the monomer of a heterocyclic compound of formula: where R is hydrogen, halogen, nitro, sulpho, hydroxyl, carbonyl, carboxyl or a monovalent aliphatic radical, acting as a stabilizer against the deleterious effects of copper. There may also be present 0,001 to 0,5% of the monomer of at least one metal salt of a saturated or unsaturated aliphatic acid, a cyclic acid or an aromatic acid. Specified monomers are styrene, alphamethyl styrene, 2, 4-dichlorostyrene, p-methylstyrene, vinyl acetate, methyl methacrylate, ethylacrylate, methallyl acrylate, diallyl phthalate, succinate, maleate or adipate methallyl alcohol, acrylonitrile, methylvinylketone, diallyl ether, vinylidene chloride, butyl methacrylate, allyl acrylate or crotonate, chloroprene, divinyl benzene, diallyl oxalate or diglycolate, triallyl citrate, carbonyl, maleyl, fumaryl, adipyl, sebacyl or phthalyl-bis-(allyl lactate), fumaryl or carbonyl-bis-(allyl glycolate) carbonyl-bis-(allyl salicylate) tetra (allyl glycolate) silicate, tetra-(allyl lactate) silicate, mixtures thereof or unsaturated polyester resins mixed with a monomer e.g. the reaction product of maleic, fumaric, monochloromaleic, itaconic and citraconic acids or anhydrides with ethylene glycol, glycerol or pentaerythritol or mixtures thereof or an unsaturated alcohol such as allyl alcohol or methallyl alcohol. Castor oil maleate ester-styrene is particularly preferred while diethoxytrivinyl triphenyl trisiloxane is mentioned in Example II. 1, 10-phenanthroline is the preferred heterocyclic compound while the linoleates, resinates, naphthenates, acetates, aro-matic benzoates, octoates, tallates, stearates of aluminium, calcium, cesium, chromium, cobalt, iron, lead, manganese, nickel, tin, titanium, vanadium, zinc and zirconium are specified metal salts. Catalysts such as benzoyl, lauroyl, di-t-butyl, and dicumyl peroxides, t-butyl and cumene hydroperoxide, ascaridole, t-butyl perbenzoate, di-t-butyl di-perphthalate and 2, 2-di-t-butylperoxy butane may be used while fillers and inhibitors may also be present.