| 摘要 |
<p>1,221,210. Polyester based moulding compositions. FARBWERKE HOECHST A.G. 7 Oct., 1968 [10 Oct., 1967], No. 47401/68. Headings C3P and C3R. A moulding composition comprises, (a) a linear saturated polyester of an aromatic dicarboxylic acid and optionally up to 10% by weight of an aliphatic dicarboxylic acid, and a saturated aliphatic or cycloaliphatic diol and (b) 0.05 to 25% by wt. calculated on the total mixture. of a polymer of an ester of acrylic acid, methacrylic acid or ethacrylic acid, and a saturated aliphatic or cycloaliphatic alcohol containing 1-30 carbon atoms. Polyesters specified are polyethylene terephthalate and polycyclohexane - 1,4 - dimethylol terephthalate, and can contain in addition to terephthalic acid, units of isophthalic, naphthalene-2,6- dicarboxylic and adipic acids, and in addition to ethylene glycol, units of 1,4-butanediol and neopentyl glycol. The polymer (b) may be a homopolymer or copolymer or a mixture of polymers and has a molecular weight of at least 3000, those specified being poly-2-ethylhexylacrylate, poly - 3 - ethylhexylacrylate and poly-n-octyl acrylate. Nucleating agents such as calcium carbonate, aluminium silicate, TiO 2 , talc and soot having a particle size of less than 2 microns may be added at various stages of making the composition. The particulate composition is preferred to have a moisture content of less than 0.01% by wt., and for this purpose the particles are coated with a water repellent paraffin wax or other wax.</p> |
