High performance polyamide compounds and uses thereof
AssigneeLyondellBasell Advanced Polymers 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.
Claims15
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 a first heat stabilizer and a second heat stabilizer;
- 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 ratio of the first heat stabilizer to the second heat stabilizer is from about 2.5:1 to about 1:1,
- wherein the first heat stabilizer comprises one or more blends of sterically hindered phenolic stabilizers and phosphonates,
- wherein the second heat stabilizer comprises bis (2,4-dicumylphenyl) pentaerythritol diphosphate, and
- wherein the nucleating agent is a fine talc having an average particle diameter that does not exceed 1.5 μm.
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 a first heat stabilizer and a second heat stabilizer;
- 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 ratio of the first heat stabilizer to the second heat stabilizer is from about 2.5:1 to about 1:1,
- wherein the first heat stabilizer comprises one or more blends of sterically hindered phenolic stabilizers and phosphonates,
- wherein the second heat stabilizer comprises bis (2,4-dicumylphenyl) pentaerythritol diphosphate, and
- wherein the nucleating agent is a fine talc having an average particle diameter that does not exceed 1.5 μm.
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 a first heat stabilizer and a second heat stabilizer 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 ratio of the first heat stabilizer to the second heat stabilizer is from about 2.5:1 to about 1:1,
- wherein the first heat stabilizer comprises one or more blends of sterically hindered phenolic stabilizers and phosphonates,
- wherein the second heat stabilizer comprises bis (2,4-dicumylphenyl) pentaerythritol diphosphate, and
- wherein the nucleating agent is a fine talc having an average particle diameter that does not exceed 1.5 μm.
Dependencies are inferred from the claim text.