Patent GB-1071167-A (GB)
Title: Improvements relating to elastomer compositions
IPC: C08L21/00
Filed: 1965-04-28
Abstract: A vulcanizable mineral-loaded elastomer composition comprises an uncured elastomer, a mineral filler containing at least on its surface aluminium magnesium or silicon and as additives (1) an epoxy compound and (2) piperazine or an aromatic compound containing attached to the aromatic nucleus, two or more active amino and/or hydroxyl groups.  Specified elastomers are ethylene/propylene/1,4-hexadiene terpolymer, ethylene/propylene copolymer, chlorosulphonated polyethylene, polychloroprene, copolymers of chloroprene with acrylonitrile, styrene, acrylic or methacrylic acid or an ester thereof, 1-3-butadiene, isoprene, 2-3-dichlorobutadiene-1,3,poly-1-hexene, ethylene / propylene / 2 - norbornene copolymer, hydrogenated poly-cis-1,4-isoprene, ethylene/propylene/non-conjugated diene copolymers, ethylene/1-butene, propylene/1-butene, ethylene/5-5-dimethyl-1-octene, 1-hexene/1-decene, ethylene/propylene/1-octadecene, propylene/5-methyl-1-heptene, 1-hexene/1-dodecene, butyl rubber, and thermoplastic polyurethanes especially segmented polyurethane.  The segmented polyurethanes are linear copolymers containing "soft" segments derived from polyether or polyester glycols connected through urethane links to "reinforcing" segments in which urethane, urea or amide links are concentrated. They may be prepared by reacting low molecular weight glycols or diamines with diisocyanates or by reacting diamines with bischloroformates of low molecular weight glycols or diacid chlorides, especially preferred are copolymers in which the "soft" segment is furnished by polytetramethylene ether glycol and the "reinforcing" segment is a urethane based on butanediol-1,4 or neopentyl glycol in combination with p-perazine or hexamethylene diamine (see U.S. Specification 2,929,802); optionally the "reinforcing" segment may contain a minor proportion of amide links derived from adipic acid.  Specified mineral fillers are "hard" and "soft" kaolin clay, magnesium silicate, esterified silica, calcined kaolin clay and fine particle talc.  The amounts of filler vary but are frequently between 60 and 300 parts for each 100 parts of elastomer.  The epoxy compounds are those which contain two or more epoxy groups and those which contain at least one epoxy group and one ethylenic double bond.  Specified epoxy compounds are those from polyhydric phenols and polyfunctional coupling agents such as polyhalohydrins, polyepoxides or epihalohydrins especially those based on 2,2 - bis(4 - hydroxyphenyl) propane, i.e. bisphenol-A, brominated epoxides, epoxy compounds prepared by condensing a phenol and formaldehyde under acidic conditions followed by reaction with epichlorhydrin, epoxidized low molecular weight polybutadiene, the epoxidized saturated esters derived from vegetable, animal and fish oils.  Specified amines are 4,42methylene-dianiline (preferred), m-phenylene diamine, 4,41-methylene - bis - (N,N - dimethylaniline) and hexamethoxymethyl triaminotriazine, resorcinol and m-aminophenol and their mixtures.  A petroleum oil may be included in the composition, as may also curing agents, accelerators, anti-oxidants, and pigments.  The compositions may be cured.