| 摘要 |
<p>1358950 Thermosetting diallyl phthalate prepolymer compositions FMC CORP 21 Sept 1972 [22 Sept 1971 11 Aug 1972] 43788/72 Heading C3P A filled flame retardant thermosetting diallyl phthalate moulding composition comprises at least 30 wt. per cent of a diallyl phthalate prepolymer which in the thermoset state does not release corrosive gases (e.g. HCl) at temperatures of at least 200‹ C. in a sealed environment (i.e. not containing, for example, diallyl chlorendate units), said composition comprising (a) the diallyl phthalate prepolymer, (b) 0À5 to 20 wt. per cent based on (a), of hexabromobiphenyl, (c) 3 to 60 wt. per cent based on (a), of alumina trihydrate and (d) an initiator in an amount sufficient to cure the prepolymer at an elevated temperature. The composition may also contain up to 200 parts by weight of an inert mineral filler and/or inert fibrous filler per 100 parts by weight of (a) plus (b), and may also contain up to 400 parts by weight of glass fibres per 100 parts by weight of (a). The compositions are prepared by mixing the prepolymer with the desired ingredients and, if necessary granulating. The products are used for moulding, when they are cured in situ in moulds using heat. Examples use commercially available diallyl ortho- and isophthalate prepolymers. Additional ingredients used, apart from (b) and (c) are “ inch glass strands, vinyl tris-(2-methoxyethyl)- silane (lubricant for the latter), Ca stearate and Sb 2 O 3 . The initiator used is t-butyl perbenzoate.</p> |
