| 摘要 |
1,197,287. Laminates. GULF RESEARCH &. DEVELOPMENT CO. 26 July, 1967 [3 Aug., 1966], No. 34220/67. Heading B5N. [Also in Division C3] Articles of manufacture comprise layers of a porous inert material impregnated and held together by the cured and polymerized reaction product of composition comprising a liquid solution of (i) a solid compound containing at least two "succinic anhydride groups " i.e. groups of the formula and less than three conjugated double bonds when a conjugated double bond is between the C atoms alpha to the carbonyl groups in a succinic anhydride group; (ii) a liquid olefinically unsaturated monooxirane compound containing as its only crosslinkable functional groups a single oxirane 0 atom and a polymerizable double bond; and (iii) a liquid olefinically unsaturated monomer free of oxirane O atoms and containing as its only crosslinkable functional group(s) at least one polymerizable double bond. In examples, copolymers of maleic anhydride with hexene-1, octene-1, dodecene-] or octadecene-1 (preferably hexene- 1) are used as component (i); glycidyl methacrylate or acrylate as component (ii); and styrene, methyl methacrylate or vinyl acetate as component (iii). The reaction mixture may also contain a tertiary amine accelerator (e.g. picoline) and a catalyst (e.g. benzoyl peroxide or phenothiazine). The layers of porous inert material may be composed of paper, cotton, linen, nylon, wood veneer, asbestos paper, sisal, hemp, or woven glass fabric (examples illustrate the use of the latter material). The impregnated layers are assembled together and cured by heating at a temperature above 80‹ C. and preferably at a pressure of above 1À05 k/cm.<SP>2</SP>. Usually a two-stage curing process is adopted, viz. first at elevated pressure for from 1-10 minutes and then at atmospheric pressure for from 1-30 hours. |
