专利名称：Preparation of methyl methacrylate
polymer sirups
发明人：CALKINS WILLIAM HAROLD,SQUIRE
EDWARD NOONAN,ZIEGLER MANDELLSTANLEY
申请号：US42384965申请日：19650106公开号：US3380980A公开日：19680430
摘要：Polymer-in-monomer syrups, wherein the said monomer is methyl methacrylatealone or with a copolymerizable a , b -ethylenically unsaturated compound, wherein thepolymer is a methyl methacrylate homopolymer or a copolymer of methylmethacrylateand a copolymerizable a , b -ethylenically unsaturated compound, has an inherentviscosity in the range 0,25 to 1 and is dissolved in said monomer, and wherein the syruphas a bulk viscosity in the range 0,5 to 50 poises and contains less than 20 p.p.m. of apolymerization initiator, may be prepared by heating the monomer in the presence of achain transfer agent, stopping the polymerization by cooling when the reaction mixturehas a bulk viscosity of 0,5 to 50 poises and the polymer an inherent viscosity of 0,25 to 1,and by using a polymerization initiator in sufficiently small amount that the final syrupcontains less than 20 p.p.m. of the initiator. Specified copolymerizable compounds arevinyl acetate, styrene, alkyl acrylates and other alkyl methacrylates. Specified chaintransfer agents are thiophenol and lauryl mercaptan. The initiator may be benzoylperoxide, diethyl peroxide, diisobutyl peroxide, a , a 1-azodiisobutyronitrile or a , a 1-
azobis-(methylisobutyrate). Cooling is preferably effected by adding as quenching liquida cold solution of an inhibitor, e.g. hydroquinone, catechol or pyrocatechol, in monomer.The syrups may also contain cross-linking agents, e.g. ethylene dimethacrylate,propylene dimethacrylate, polyethylene glycol dimethacrylate, divinyl benzene, triallylcyanurate and diallyl phthalate, and inert additives, e.g. glass fibres, powdered metals,pigments, natural and synthetic fibres and may be used in laminating, moulding andpotting. U.S.A. Specification 2,471,959 is referred to.
申请人：E. I. DU PONT DE NEMOURS AND COMPANY
更多信息请下载全文后查看
因篇幅问题不能全部显示，请点此查看更多更全内容