| abstract |
1389810 Laminates DYNAMIT NOBEL AG 5 June 1973 [7 June 1972] 26879/73 Heading B5N [Also in Divisions B2 and D1] In a process for the production of a glass fibre reinforced vinyl chloride thermoplast, prior to incorporation in the thermoplast the glass fibre reinforcing material, which may be in the form of woven or non-woven fabric, loose cut filaments or staple or short fibres, is coated with a bonding agent comprising a vinyl chloride/vinyl trialkoxysilane copolymer. The latter copolymer may also comprise further co-monomers such as vinyl acetate, vinyl propionate, vinyl stearate, vinyl laurate, a #-alkylated pivalic acid vinyl ester, a vinyl versatic ester, di-2-ethylhexyl or dicyclohexyl fumarate or maleate, butyl, iso-butyl or iso-octyl acrylate or methacrylate, or 2-ethylhexyl or isobutyl vinyl ether. It may be applied, optionally together with epoxidized soya bean oil as stabilizer, as a solution or dispersion by impregnation under vacuum. Prior to application of the bonding agent, the glass fibre reinforcing material may be sized with a chromium methacrylate complex or a substituted alkyl trialkoxysilane. The vinyl chloride thermoplast to be reinforced may be a vinyl chloride homopolymer or copolymer with ethylene, propylene or vinylidene chloride, or a chlorinated PVC or copolymer. In the examples, woven glass fibres are coated with the bonding agent, dried, stacked alternately with PVC films and the stack heated under under pressure in a platen press. |