| 摘要 |
<p>1,217,709. Curing polymers by laser beam. FMC CORP. 13 Sept., 1968 [14 Sept., 1967], No. 43570/68. Heading C3P. [Also in Division G2] Resins compositions which are curable by laser beams comprise a thermally cross-linkable allylic ester resin obtained by the polymerization of an addition polymerizable allyl carboxylic ester having a plurality of aliphatic ethylenically unsaturated linkages, at least one of which is an allyl ester group, the resin having residual unsaturation and being a solvent-soluble material which is a solid at ambient temperatures and which undergoes very little shrinkage when further polymerized by heat at room temperature; and a peroxide catalyst which accelerates polymerization of the said cross-linkable allylic ester resin. Preferred resins are (A) prepolymers of esters of formulµ: (in which R is allyl, n is 1-17, y is 1 or 2, and X is halogen, OH, optionally substituted phenyl, furfuryl or C 1-4 alkyl or alkoxy); (B) copolymers of (i) an allyl ester of an unsaturated monobasic acid or (ii) a poly(allyl)ester of an aliphatic carboxylic acid, with another monomer (e.g. butadiene, styrene, methylmethacrylate, vinylidene chloride, vinyl chloride, vinyl acetate, diethylene glycol, maleate, cinnamyl cinnamate) and (C) polymers of allyl esters of benzene, naphthalene and s-triazine carboxylic acids.</p> |
