Polyester compositions which crystallize rapidly

Details Polyester compositions which crystallize rapidly Polyester compositions which crystallize rapidly

1979-05-18

1980-09-16

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528309, 264239, 264176R, C08G 6318

Patent

active

042231256

ABSTRACT:
This invention relates to polyalkylene terephthalates which crystallize rapidly, and process of making such compositions and a process of using such compositions in injection molding. The compositions comprise polyalkylene terephthalates with intrinsic viscosities in excess of about 0.4 dl/g in 1:1 phenol/tetrachloroethane at 25.degree. C. and at least about 0.5 wt. %, based on the weight of resin and additive, of an aromatic carboxylic acid ester. These compositions may be prepared by intimately mixing the ingredients, for example by extrusion. These compositions, particularly those wherein the polyester consists essentially of polyethylene terephthalate, may be injection molded with mold temperatures less than about 120.degree. C. and still retain a significant degree of crystallinity even with short mold residence times.

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