| 摘要 |
Self-extinguishing synthetic resins are prepared by polymerizing a mixture comprising (A) at least 5 weight per cent of a vinyl chloride copolymer, (B) at least 1.2 weight per cent of phosphorus in the form of a phosphorus compound, (C) at least one monomeric polymerizable organic compound and optionally (D) up to 3 weight per cent of a cross-linking agent. (A) may be a copolymer of vinyl chloride with vinyl acetate, an ester of acrylic, methacrylic or maleic acid, or a phosphorus containing comonomer. Specified phosphorus compounds are orthophosphoric acid, trimethyl phosphate, trichlorethyl phosphate, bis-(chlorethyl)-propenyl-2-phosphonate and unsaturated compounds such as 1 - methacrylylethane - 1,1 - bis - (phosphonic acid dimethyl ester) and 1-methacrylylethane phosphonic acid dimethyl ester. The monomer (C) may be an acrylic or methacrylic ester, optionally in admixture with vinyl aromatic compounds, vinyl acetate or dicarboxylic acid anhydride or ester; and may be present as a monomer/polymer syrup or prepolymer. Specified cross-linking agents are diacrylates and dimethacrylates of glycols and polyglycols. Glass and asbestos fibres, fillers, pigments, heat and light stabilizers, and catalysts may also be present. Examples describe the polymerization of compositions comprising (1-4) methyl methacrylate monomer and prepolymer, vinyl chloride/vinyl acetate copolymer and trichlorethyl phosphate; methyl methacrylate monomer with and without prepolymer, vinyl chloride/vinyl acetate copolymer, dibutyl tin dilaurate, ultra-violet light absorber, and (6 and 7) a high molecular weight organic phosphorus compound, (8 and 9) a commercial organic phosphorus compound, (10 and 11) trimethyl phosphate, (12) bis-(chloropropyl) - propenyl - 2 - phosphonate and (14) trichlorethyl phosphate and triethylene glycol dimethacrylate; (13) methyl methacrylate, vinyl chloride/maleic ester copolymer, trichlorethyl phosphate and stabilizers; (18) methyl methacrylate, vinyl chloride/vinyl acetate copolymer, trichlorethyl phosphate together with (15) styrene, (16) butyl acrylate and triethylene glycol dimethacrylate, (20) triethylene glycol dimethacrylate, (26) maleic anhydride, and (27) dimethyl fumarate; methyl methacrylate, vinyl chloride/vinyl acetate copolymer and (17) 1-methacrylylethane phosphonic acid dimethyl ester, and (24 and 25) orthophosphoric acid, (19 and 21) methyl methacrylate monomer and prepolymer, vinyl chloride/vinyl acetate copolymer, trichlorethyl phosphate and triethylene glycol dimethacrylate; vinyl chloride/vinyl acetate copolymer trichlorethyl phosphate and (28) tetrahydrofurfuryl methacrylate and (29) cyclohexyl methacrylate. |
