| 摘要 |
1,016,660. Laminates. UNITED STATES RUBBER CO. Sept. 28, 1964 [Oct. 11, 1963], No. 39343/64. Heading B5N. A rigid, heat-formable laminated sheet material comprises a core sheet of rigid cellular gum plastic material which is a blend of from 51 to 90 parts by weight of a styreneacrylonitrile resin or a mixture of a styreneacrylonitrile resin with a polyvinyl chloride resin and correspondingly from 49 to 10 parts by weight of butadiene-acrylonitrile rubber, a rigid sheet of solid gum plastic of the said composition integrally united to each face of said core sheet, and an outer protective skin of flexible, adherent material overlying at least one outer surface of said laminate, said skin being a composition comprising 60 to 85% by weight of polyvinyl chloride resin and correspondingly 40 to 15% by weight of butadieneacrylonitrile rubber, the said butadiene-acrylonitrile rubber in the skin being cured. The gum plastic may be based at least in part on a graft copolymer of the rubber and the resin and may contain plasticizers, antioxidants, stabilizers, vulcanizing agents, pigments and fillers, the core also containing a blowing agent. The protective skin layer may contain a minor amount of a copolymer of vinyl chloride with vinyl acetate, vinylidene chloride or diethyl maleate. The skin layer also contains dicumyl peroxide, di-t-butyl peroxide, 2 : 2-bis- (t-butyl peroxy) butane, di-t-amyl peroxide, t - butyl - 1 - methyl - cyclohexyl peroxide, di- (3 - methyl pentyntl) - 3 - peroxide, 2 : 2 - bis- (t-butyl peroxy) propane, benzoyl peroxide, acetyl peroxide, t-butyl hydroperoxide, suecinyl peroxide, acetyl benzoyl peroxide or sulphur or sulphur-yielding curatives. |
