Polybutylene terephthalate moulding compositions with an...

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C - Chemistry, Metallurgy

08

L

339/114, 400/570

C08L 67/02 (2006.01) C08K 5/098 (2006.01) H01B 3/42 (2006.01)

Patent

CA 2000289

ABSTRACT Thermoplastic polyester compositions comprising at least two groups of polybutylene terephthalate with substantially different intrinsic viscosity values and conventional additives for moulding are disclosed. The polymer compositions show an improved thermal flow capability under moulding conditions expressed in such indices as heat flow(m cal/sec), enthalpy change .DELTA.Hm(Joule/gr) at the solidification of fused polymer. crys- talline fraction (Xc), and the time of growth t o (sec) of the primary nuclei of embryonic crystalline. The polymer compositions of the present invention results in a larger size of crystalline than the case of independent, single polymer and this enables to carry out injection moulding at about 20 degrees lower cylinder temperature than usual moulding practice without sacrifysing mechanical and thermal properties of the product.

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