GB1092086A - Elastomeric compositions including a phenolic resin tackifier - Google Patents

Abstract

A composition comprises (A) 1-30 parts of a resin of formula <FORM:1092086/C3/1> where R is alkylene, or haloalkylene, Y is H, aliphatic, unsaturated aliphatic, cycloalkyl, aromatic or furanyl, A is H, alkyl, substituted alkyl, alicyclic, substituted alicyclic, alkyl or alicyclic ketonic, alkyl or alicyclic carboxylic, m is 0 or 1 and n is 1-18 provided that when A is H, Y is a carbon containing group and when Y is H, alkyl of more than 4 carbon atoms or aromatic other than phenyl m is 1 and (B) an elastomeric composition comprising 100 parts of elastomer. (A) may be prepared by (1) alkylating a phenol; (2) polycondensing the product with an aldehyde; and (3) hydroxyalkylating it. Alkylation may be by treatment with an olefin, e.g. 2,4,4-tri-methylpent-2-ene. A radical specified include alkyl, e.g. tert-butyl, secondary butyl, tert-hexyl, iso-octyl, tert-octyl, decyl, dodecyl, tetradecyl, octadecyl, nonyl, methyl, pentadecyl and cetyl, cycloalkyl, e.g. cyclohexyl, cyclopentyl, methyl cyclohexyl and butyl cyclohexyl, alkyl and cycloalkyl ketone groups, alkyl and cycloalkyl carboxylate groups and aralkyl groups, e.g. (p-hydroxyphenyl) propyl and (p-hydroxyphenyl) methyl. Aldehydes specified for the polycondensation have up to 8 carbon atoms, e.g. formaldehyde, acetaldehyde, propionaldehyde, isobutyraldehyde, benzaldehyde, furfural, paraformaldehyde, trioxane, paraldehyde, 2-ethyl hexanol, ethyl butyraldehyde, heptaldehyde and glyoxal, isopentaldehyde and crotonaldehyde. 0.5-1 Mole of aldehyde may be used per mole of phenol. Condensation catalysts specified are H2SO4, (COOH)2 and HCl. The polycondensation may take place at up to 150 DEG C. and up to 100 p.s.i. Afterwards the catalyst may be neutralized, e.g. with lime. Hydroxyalkylation may be effected with an alkylene oxide or alkylene halohydrin, e.g. ethylene, propylene, butylene, styrene and cyclohexene oxides, glycidol, epichlorohydrin, ethylene propylene, 2,3-butylene and glyceryl chloro and bromohydrins and alkylene carbonates e.g. ethylene and propylene carbonates. Catalysts specified for hydroxy-alkylation are amines, e.g. Me3N, metal amides and salts of strong bases and weak acids. No more than 0.5% of the phenol hydroxyl groups may be unreacted. Elastomers specified are copolymers of ethylene and propylene optionally with 5-10% of an unconjugated diene, e.g. dicyclopentadiene or 1,4-hexadiene. The composition may be prepared at 125-275 DEG F. and may also contain pigments, fillers, e.g. carbon black, clay and ZnO, stabilizers, plasticizers, e.g. naphthenic process oil, waxes, accelerators and organic acid activators, e.g. stearic acid. The elastomer may be cured at 250-345 DEG F/23-1000 p.s.i. using a free radical catalyst, e.g. dicumyl peroxide or sulphur and a catalyst such as zinc dimethyl dithiocarbamate, tetramethyl thiuram mono- and disulphide and 2-mercapto-benzthiazole. The product may be made into shaped articles.