GB1298134A - Fiber filled urethane elastomer compositions - Google Patents

Abstract

1298134 Elastomeric compositions ATLANTIC RICHFIELD CO 3 Nov 1970 [18 Nov 1969] 52317/70 Heading C3P Elastomeric compositions comprise fibres incorporated into a urethane made by reacting a diisocyanate with a hydroxy-containing intermediate polymer derived from 25-100% of a C 4-12 conjugated diene and 0-75% of a C 2-12 olefinic monomer, the amount of fibres being 0À1-50 wt. per cent based on the intermediate polymer. The intermediate polymer is a liquid polymer defined as containing an average of at least 1À8 predominantly primary terminal allylic hydroxyl groups per average molecule, having a viscosity at 30‹ C. of 5-20,000 poises, a number average M.W. of 400-25,000, and more than 50% of its unsaturation in the main carbon chain. The urethane formation may take place in the additional presence of a polyhydroxy reactant and/or a diamine, the latter resulting in a urea-urethane. The urethane or urea-urethane resin may be formed in situ, or the fibres may be added to pre-formed resin, both alternatives being exemplified. In specific examples, the fibres are of glass; the hydroxycontaining liquid intermediate polymer is derived from butadiene or butadiene-styrene; the diisocyanate used is tolylene diisocyanate or diphenylmethane diisocyanate; the additional polyhydroxy reactant (when used) is N,N-bis-(2- hydroxy-propyl) aniline; the additional diamine reactant (when used) is 3,3<SP>1</SP>-dichlorobenzidine or N,N - bis - (1,4 - dimethylpentyl) - p - phenylene diamine; and carbon black and naphthenic extender oil are present in some cases. In those examples in which the urethane or ureaurethane resin is produced in situ, stannous octoate or dibutyl tin laurate is present as catalyst.