Rapidly crystallizing polyester compositions

Details Rapidly crystallizing polyester compositions Rapidly crystallizing polyester compositions

1978-03-24

1979-07-31

Lee, Lester L.

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

Synthetic resins

Ethylenically unsaturated reactant admixed with a preformed...

260 40R, 260 40P, 528173, 528175, C08G 6370, C08G 6376

Patent

active

041631005

ABSTRACT:
The present invention is concerned with polyalkylene terephthalate molding compositions which have improved crystallization behavior as a result of blending with selected sulphonic acid esters. The addition of an effective amount of these esters, generally between about 0.5 to 30 wt. %, improves the rate of crystallization of polyalkylene terephthalates such as polyethylene terephthalate thus permitting the use of shorter mold residence and lower mold temperatures in injection molding.
The invention is also concerned with a process for improving the crystallization behavior of polyalkylene terephthalates by melt blending them with selected sulphonic acid esters.

REFERENCES:
patent: 3313778 (1967-04-01), Sakurai et al.
patent: 3583941 (1971-06-01), Trapasso et al.
patent: 3663508 (1972-05-01), Mobius et al.

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