High performance polyamide compounds and uses thereof
AssigneeA. Schulman, Inc.
InventorYing Shi
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Abstract
Disclosed herein are high performance semi-aromatic polyamide compounds having improved performance indicators for various applications, including alkaline battery end cap seal assembly applications. In one preferred embodiment, the disclosure relates to compounds comprising a semi-aromatic polyamide component comprising recurring terephthalamide and/or isophthalamide units, an impact modifier component comprising a modified polyolefin elastomer, one or more synergistic blends of sterically hindered phenolic stabilizers and phosphonates and one or more relatively high molecular weight organic phosphite stabilizers, and a fine talc nucleating agent.
Claims21
A formed article obtained by forming a semi-aromatic polyamide resin composition comprising:
- 90 to 70 weight percent of at least one semi-aromatic polyamide;
- 5 to 25 weight percent of at least one modified polyolefin elastomer;
- 0.2 to 2 weight percent of first and second heat stabilizers;
- and
- 0.1 to 2 weight percent of a nucleating agent,
- wherein the at least one semi-aromatic polyamide has a melt temperature from 305° C. to about 343° C. and a glass transition temperature from 90° C. to 130° C., wherein the first heat stabilizer comprises one or more sterically hindered phenolic stabilizers, alkyl phosphonate stabilizers, or metal salt and halide stabilizers, or combinations thereof, and wherein the second heat stabilizer comprises one or more sterically hindered phenolic stabilizers, organic phosphite stabilizers, or combinations thereof, and wherein the ratio of the first heat stabilizer to the second heat stabilizer is from about 2.5:1 to about 1:1.
A battery end cap seal assembly obtained by forming a semi-aromatic polyamide resin composition comprising:
- 90 to 70 weight percent of at least one semi-aromatic polyamide;
- 5 to 25% weight percent of at least one modified polyolefin elastomer;
- 0.2 to 2 weight percent of first and second heat stabilizers;
- and
- 0.1 to 2 weight percent of a nucleating agent,
- wherein the at least one semi-aromatic polyamide has a melt temperature from 305° C. to about 343° C. and a glass transition temperature from 90° C. to 130° C., wherein the first heat stabilizer comprises one or more sterically hindered phenolic stabilizers, alkyl phosphonate stabilizers, or metal salt and halide stabilizers, or combinations thereof, and wherein the second heat stabilizer comprises one or more sterically hindered phenolic stabilizers, organic phosphite stabilizers, or combinations thereof, and wherein the ratio of the first heat stabilizer to the second heat stabilizer is from about 2.5:1 to about 1:1.
A semi-aromatic polyamide resin composition comprising:
- 90 to 70 weight percent of at least one semi-aromatic polyamide;
- 5 to 25 weight percent of at least one impact-modified polyolefin elastomer;
- 0.2 to 2 weight percent of first and second heat stabilizers;
- and
- 0.1 to 2 weight percent of a nucleating agent,
- wherein the at least one semi-aromatic polyamide has a melt temperature from 305° C. to about 343° C. and a glass transition temperature from 90° C. to 130° C., wherein the first heat stabilizer comprises one or more sterically hindered phenolic stabilizers, alkyl phosphonate stabilizers, or metal salt and halide stabilizers, or combinations thereof, and wherein the second heat stabilizer comprises one or more sterically hindered phenolic stabilizers, organic phosphite stabilizers, or combinations thereof, and wherein the ratio of the first heat stabilizer to the second heat stabilizer is from about 2.5:1 to about 1:1.
Dependencies are inferred from the claim text.