Polyamide blends having improved processing characteristics
First Claim
1. A method for improving the flow characteristics and rheological properties of a nylon resin which comprises blending therewith from 0.01% to 20% by weight of a high molecular weight polyamide additive having an amine value less than 3 and 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 total dibasic acid charge, of a short-chain, saturated, aliphatic dibasic acid having from 2 to 13 carbon atoms with a stoichiometric amount of an aliphatic, saturated diamine having from 2 to 10 carbon atoms or a mixture of said diamines.
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Abstract
The flow characteristics and rheological properties of high molecular weight thermoplastic polyamides are significantly improved by blending therewith a small amount of a polyamide derived from high molecular weight dibasic acids. In addition to improving the processability of the thermoplastic resin, the blends and manufactured articles produced therefrom have other desirable properties.
77 Citations
15 Claims
- 1. A method for improving the flow characteristics and rheological properties of a nylon resin which comprises blending therewith from 0.01% to 20% by weight of a high molecular weight polyamide additive having an amine value less than 3 and 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 total dibasic acid charge, of a short-chain, saturated, aliphatic dibasic acid having from 2 to 13 carbon atoms with a stoichiometric amount of an aliphatic, saturated diamine having from 2 to 10 carbon atoms or a mixture of said diamines.
- 10. A thermoplastic polyamide resin blend having improved flow characteristics and rheological properties comprising 80% to 99.99% by weight of a nylon resin and 0.01% to 20% by weight of a polyamide additive having an amine value less than 3 and 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 having from 2 to 13 carbon atoms with a stoichiometric amount of an aliphatic, saturated diamine having from 2 to 10 carbon atoms or a mixture of said diamines.
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