Thermoplastische Polyesterformmassen

摘要

1,210,054. Injection mouldable polyesters. FARBWERKE HOECHST A.G. 11 March, 1969 [23 March, 1968], No. 12713/69. Heading C3R. Thermoplastic moulding compositions consist of a nucleating agent having a particle size of below 2 microns and a polyester containing the residues of (a) an aromatic dicarboxylic acid and optionally a small amount of an aliphatic dicarboxylic acid, (b) a saturated aliphatic or cycloaliphatic diol, and (c) an alcohol having more than two primary hydroxy groups in an amount in the range 0.01% to 2% by weight, calculated as the free alcohol with reference to the weight of polyester. The preferred polyester is modified polyethylene terephthalate or poly-( 1 ,4-cyclohexyl-dimethylene)- terephthalate. Specified are polyols: 1,1,1- tris - hydroxymethyl ethane, 1,1,1 - tris - hydroxymethyl propane, pentaerythritol, dipentaerythritol, 1,1,1,6,6,6 - hexakis - hydroxymethyl - hexane, 1,1,3,3 - tetrakis - hydroxymethyl - cyclopentane and 1,2,4 - tris - hydroxymethyl benzene; nucleating agents: kaolin, talc, alkaline earth metal carbonates, aluminium silicate or a copolymer of ethylene and acrylic acid. The composition may also contain (i) up to 20% by wt. of a copolymer of ethylene and an acrylic acid ester or of butadiene and styrene, and (ii) a wax, e.g. paraffin wax or polyethylene wax.