GB729780A - Stabilized thermosetting compositions - Google Patents

Abstract

A stabilized thermosetting moulding composition comprises (1) an unsaturated alkyd resin having a plurality of D 2,3-enedioyl groups in the molecule, (2) 0.01 to 5 per cent of (1) of an organic peroxide or ozonide, (3) 0.02 to 2 per cent of (1) of a nuclear-substituted aryl hydroxide having at least one nuclear substituent that (a) comprises a monovalent hydrocarbon radical and (b) has no oxygen atom connected to an atom connected to the nucleus, the number of oxygen and nitrogen atoms connected to any atom connected to the nucleus being no more than one, carried on a filler which is 40 to 85 per cent of the weight of the composition, which is in such a form that the major part of the other ingredients are carried by the filler in contact with air. The binder (1) may be derived from unsaturated dibasic acids such as maleic, fumaric, itaconic, citraconic or mesaconic acid and dihydric alcohols such as polymethylene glycols, propylene glycol, butylene glycols, polyethylene glycols, dipropylene glycol, monoformin, monoacetin, monomethylin, monoethylin and primary or secondary dihydroxy-alkanes in the series dihydroxybutane to dihydroxydecane. It may be modified by monobasic acids, monohydric alcohols and natural resin acids. The binder may include a cross-linking monomer of which a long list is given. The catalyst (2) may be benzoyl, p-bromobenzoyl, p-chlorobenzoyl, dichlorobenzoyl, acetyl, acetylbenzoyl, chloracetyl, phthalyl or succinyl peroxide, peracetic acid, perbenzoic acid, t.-butyl perbenzoate, benzyl peracetate, t.-butyl hydroperoxide, diisopropylene and diisobutylene ozonides. The stabilizer (3) may be o-, m- or p-cresol, orcinol, hydroquinone monomethyl or monobenzyl ether, 2 - chloro - 5 - hydroxy toluene, 2 - amino-5-hydroxy toluene hydrochloride, benzene azoresorcinol, b - methyl - umbelliferone, vanillin, vanillyl alcohol, guaiacol, p-hydroxy diphenyl, p-benzyl phenol, eugenol, ionol (2,6-di-tert.-butyl-4-methylphenol), creosol and lignocol A and B which are beechwood creosote fractions boiling between 180 DEG and 240 DEG C. The filler may be a -cellulose, glass fibres, asbestos, ground glass, clay, mica, talc or calcium silicate. The composition is formed, e.g. on a rubber mill, into leathery sheets or extruded into rods or ribbons of a maximum thickness of 1/4 inch, and if desired, comminuted into particles having a maximum diameter of 1/4 inch. In preparing the composition the catalyst may be dissolved in the monomer, ground with the filler or a fibrous filler may be impregnated with a solution of the catalyst and dried. In examples the composition comprises polyethylene maleate, or polyethylene propylene maleate, diallyl phthalate or diallyl maleate, benzoyl peroxide, zinc stearate, clay, asbestos and stabilizer. Specification 690,956 is referred to.