| 摘要 |
<p>A copper-clad plastic panel is made by applying to a copper panel a composition containing monomeric and polymeric methyl methacrylate bond, as an adhesion promoter, a polyhydric alcohol-polybasic acid condensation product in which at least 25% by weight of the acid component contains an olefinic bond in a position alpha to one of the carboxyl groups thereof, and then polymerizing the composition by heat and pressure. Preferred adhesion promoters are obtained by condensing maleic, fumaric, itaconic or aconitic acid or anhydride with ethylene glycol, propylene glycol, glycerol or 1,1-isopropylidene bis-(p-phenyleneoxy) di-2-propanol. The polymerizable composition p may also contain additional monomers, cellulose esters, inorganic fillers and chlorinated hydrocarbon fire-retarding agents.ALSO:A composition which may be polymerized in contact with a copper sheet comprises a liquid mixture of monomeric and polymeric methyl methacrylate and, as an adhesion promoter, a polyhydric alcohol-polybasic acid condensation product in which at least 25% by weight of the acid component contains an olefinic bond in a position alpha to one of the carboxyl groups thereof, any other components being inert in respect of the adherent properties for copper sheet. The mixture of monomeric and polymeric methyl methacrylate may be made either by dissolving the monomer in the polymer or else by partial polymerization of the monomer. Other polymerizable materials may be present, e.g. methyl acrylate, acrylonitrile and polyethylene glycol dimethacrylate. Adhesion promoters specified are condensation products of: (a) maleic anhydride and ethylene glycol; (b) maleic anhydride, succinic anhydride and ethylene glycol; (c) itaconic anhydride and ethylene glycol; (d) maleic acid and propylene glycol; (e) fumaric acid and 1,1-isopropylidene bis-(p-phenyleneoxy) di-2-propanol; (f) maleic anhydride and 1,5-pentanediol; (g) aconitic acid, o-phthalic anhydride and ethylene glycol; and (h) maleic anhydride and glycerol. The polymerization of the compositions may be promoted by the inclusion of catalysts such as benzoyl and lauroyl peroxides, tertiary butyl perbenzoate and azodiisobutyronitrile. Also present in the compositions may be additional substances such as cellulose acetate and butyrate, styrene-methyl methacrylate copolymers, calcium sulphate, carbonate and metasilicate, silica, clay, alumina, calcined aluminium silicate, antimony oxide and chlorinated biphenyl and terphenyl.</p> |
