Thermoplastic polyester compositions containing polyamide additives
AssigneeEmery Industries, Inc.
InventorsHarold E. Mains, Frederick R. Williams, William L. O'Brien
Life of this patent
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Abstract
The flow characteristics and rheological properties of thermoplastic polyesters and copolyesters are significantly improved by the addition of a polyamide resin thereto. In addition to improving the processability of the thermoplastic materials the polymeric additives also impart other desirable properties to the resulting manufactured products.
Claims13
A method for improving the flow characteristics and rheological properties of thermoplastic polyester and copolyester resins which comprises incorporating therein 0.01% to 20% by weight of a polyamide having a number average molecular weight from about 5,000 to 50,000 obtained by the reaction of a high molecular weight aliphatic or cycloaliphatic dibasic acid containing from 18 to 52 carbon atoms and up to 30 weight percent, based on the total acid charge, of a short-chain, saturated, aliphatic dibasic acid containing from 2 to 13 carbon atoms with an aliphatic saturated diamine containing from 2 to 10 carbon atoms or a mixture of said diamines.
An improved resin composition comprising a thermoplastic polyester or copolyester resin and from 0.01 to 20% by weight, based on the weight of said resin, of a high molecular weight polyamide obtained by the reaction of a high molecular weight aliphatic or cycloaliphatic dibasic acid having from 18 to 52 carbon atoms and up to 30 weight percent, based on the total dibasic acid charge, of a short-chain, saturated, aliphatic dibasic acid containing from 2 to 13 carbon atoms with an aliphatic, saturated diamine containing from 2 to 10 carbon atoms or a mixture of said diamines, said polyamide having a number average molecular weight from about 5,000 to 50,000 a softening point in the range 100.degree. C to 240.degree. C and amine value less than three.
Dependencies are inferred from the claim text.