| 摘要 |
<p>Tackifiers and bonding cements for ethylene/propylene/polyene terpolymer rubber stocks comprise (a) an unvulcanized ethylene/propylene/polyene terpolymer rubber, (b) a vulcanizing agent for (a), and (c) a resin which is the reaction product of (i) phenol or an alkyl or cycloalkyl phenol having at least one unsubstituted ortho or para position, (ii) a terpene and (iii) a cyclic polyene other than a terpene which is a mono or polycyclic hydrocarbon having at least two non-conjugated double bonds, (a) and (c) being dissolved in a volatile organic solvent. The rubber (a) may be derived from ethylene, propylene and dicyclopentadiene, 1,4-hexadiene, methylenenorbornene, 1,5-cyclooctadiene, allo ocimene or methyl cyclopentadiene dimer. Resin (c) may be prepared by reacting phenol or an alkyl or cycloalkyl phenol, a terpene, e.g. pinenes, d-limonene, a -terpineol and delta-3-carene, and a cyclic diene, e.g. dicyclopentadiene, methylcyclopentadiene dimer, vinylcyclohexenes, bicycloheptadiene, cyclododecatriene, cyclooctadiene, cyclooctatriene, cycloheptadiene, cyclopentadiene and methylcyclopentadiene, in the presence of a Friedel-Crafts catalyst in a solvent, e.g. aromatic and aliphatic hydrocarbons, chlorinated aromatic hydrocarbons and naphthenes. The cements may also comprise extending oils and conventional fillers, e.g. carbon black, silica, calcium silicate and lignin, and may be used for bonding ethylene/propylene/polyene rubbers, e.g. in retreading tyres. Examples describe the preparation of resins from phenol, dicyclopentadiene and (A) a -pinene and b -pinene, (B) b -pinene, (C) a -pinene and (D) d-limonene, and from phenol, bicycloheptadiene and (E) b -pinene and (F) d-limonene, in xylene in the presence of boron trifluoride. Further examples describe cements comprising ethylene/propylene/polyene terpolymer rubbers, carbon black, extending oil, zinc oxide, stearic acid, mercaptobenzothiazole, tetramethylthiuram monosulphide, sulphur and (1, 2 and 4) resin (A), (3) resin B, (5) resin A, B, C or D, (6) resin A, B, E or F and (7) resin A and butyl rubber.</p> |
