1377097 Coated glass fibres GENERAL ELECTRIC CO 11 Nov 1971 [21 Dec 1970] 52463/71 Heading B2E [Also in Division C3] Reinforcement glass fibres for moulding resin compositions are individually uniformly coated with a flame-retardant (defined) resin sizing composition. The glass filaments may be of lime-aluminium borosilicate glass, which is relatively soda free. The filaments may be bundled into fibres, and the fibres bundled into yarns, ropes or rovings or woven into mats. Conveniently the filamentous glass is in the form of chopped strands of # inches to 2 inches long. Suitable flame-retardants are plastic or thermosetting resins such as thermoplastic halogenated vinyl polymers such as polyvinylidene chloride or polychlorostyrene, or halogenated epoxy or halogenated polyester resins. The sizing composition may comprise a thermoplastic or thermosetting resin and a flame-retardant additive. Numerous suitable resins for the sizing composition are listed together with suitable flame-retardant additives. In Examples chopped glass rovings lightly sized with dextronized starch are coated with an epoxy resin containing heavily chlorinated diphenyl containing more than two chlorine atoms per phenyl nucleus. In another Example glass fibres containing 1.2% by weight of a thermoplastic styrene-ethylacrylate copolymer sizing material is coated by immersing in a solution in chloroform of chlorinated biphenyl and drying. In Example 3 the sizing composition was a polyester resin containing "Hetron" PRI-30 (Trade Mark) and applied to the glass fibres by dispersion in a solution of 7.5 parts by weight of the sizing composition and 150 parts by weight of chloroform. In Example 4 the resin composition is a poly(o,p-dichlorostyrene).
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