Color improvement and acetaldehyde reduction in high molecular weight polyesters
AssigneeThe Goodyear Tire & Rubber Company
InventorsFreddie L. Massey, Douglas D. Callander
Life of this patent
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Abstract
This invention relates to a method of improving the brightness and color of a polyester resin and reducing the acetaldehyde content by passing the resin through molecular sieves at a temperature of from 230.degree. C. to about 300.degree. C.
Claims9
The method of treating molten polyester resin which comprises heating said resin to a temperature of from 230.degree. C. to about 300.degree. C. and passing said resin through a molecular sieve.
The method of reducing the level of acetaldehyde from molten polyester resin which comprises passing said resin, at a temperature of from 230.degree. C. to about 300.degree. C., through a molecular sieve for a time sufficient to reduce the level of acetaldehyde in said resin.
The method of improving the brightness and color in a molten polyester resin which comprises extruding said resin through a filter containing a molecular sieve.
A filter comprising of a molecular sieve, said filter situated between an extruder outlet and a receiving mold or forming die.
Dependencies are inferred from the claim text.