Process for increasing the rate of crystallization of polyesters

Details Process for increasing the rate of crystallization of polyesters Process for increasing the rate of crystallization of polyesters

1982-03-16

1983-08-30

Phynes, Lucille M.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524396, 524412, 524513, 525176, C08F 800, C08L 6702

Patent

active

044017928

ABSTRACT:
A process is provided for increasing the rate of crystallization of polyester compounds, such as poly (alkylene arylates), more particularly poly(alkylene terephthalates), or blends or mixtures thereof, as for example, poly(ethylene terephthalate), poly(butylene terephthalate) or mixtures of blends thereof, by incorporating therein a small amount of a polyethylene ionomer, or an alkali metal salt of benzoic acid, such as sodium benzoate. The faster crystallization rates improve injection molding performance of the polyesters and blends thereof, such as reduced post-mold shrinkage, faster mold cycle times and lower mold temperature. Also, the resultant products show increases in physical properties such as flex modulus, flex strength, deflection temperature under load (DTUL), tensile strength and solvent resistance. The process is applicable not only to unfilled polyester compounds but also to mineral or glass-filled, or fire-retardant-containing compounds, to impact modified polyesters, as well as blends of polyesters, such as poly(ethylene terephthalate)/poly(butylene terephthalate) (PET/PBT) blends, unfilled and filled with the aforesaid components.

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Science, May 23, 1980, vol. 208, p. 810.

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