IDiyas

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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10577500 B1

PDFFull Text
Date of Patent:
Mar. 03, 2020

Filed:

Jun. 26, 2014

Process for the preparation of a semi-crystalline semi-aromatic polyamide

Applicant:

Dsm Ip Assets B.v., Heerlen, NL;

Inventors:

Johannes Hoekstra, Echt, NL;

Rudy Rulkens, Echt, NL;

Hans Klaas Dijk,Van, Echt, NL;

Assignee:

DSM IP ASSETS B.V., Heerlen, NL;

Attorney:

Nixon & Vanderhye P.C.

Primary Examiner:

Tri V Nguyen

Int. Cl.
CPC ...
C08L 77/06 (2006.01); C08G 69/26 (2006.01); C08G 69/28 (2006.01); C08G 69/30 (2006.01); C08K 7/14 (2006.01); C08K 3/40 (2006.01); C08L 77/00 (2006.01); C08G 81/00 (2006.01); B29B 7/00 (2006.01); B29B 7/82 (2006.01); B29C 45/00 (2006.01); B29C 45/72 (2006.01); B29K 77/00 (2006.01);
U.S. Cl.
CPC ...
C08L 77/06 (2013.01); B29B 7/002 (2013.01); B29B 7/82 (2013.01); B29C 45/0001 (2013.01); B29C 45/72 (2013.01); C08G 69/265 (2013.01); C08G 69/28 (2013.01); C08G 69/30 (2013.01); C08G 81/00 (2013.01); C08K 3/40 (2013.01); C08K 7/14 (2013.01); C08L 77/00 (2013.01); B29K 2077/10 (2013.01); C08L 2205/025 (2013.01);
Abstract

The invention relates to a process for the preparation of a semi-crystalline semi-aromatic polyamide copolymer (Co-PA) having a melting temperature (Tm-Co-PA) of at least 300° C., comprising steps of (a) preparing a first semi-crystalline semi-aromatic polyamide (A), having a melting temperature (Tm-A) of at least 310° C.; and consisting of repeat units derived from 45-50 mol % terephthalic acid; 47.5-50 mol % of diamine; and 0-5 mol % of one or more other amine and/or acid group containing components; the mol % being relative to the total molar amount of said amine and/or acid group containing components; and wherein poly-amide (A) is prepared by a process comprising direct solid-state polymerization of a diamine-dicarboxylic acid salt of the terephthalic acid and the diamine; (b) providing a polyamide (B), being an amorphous polyamide having a glass transition temperature (Tg-B) below Tm-A, or a second semi-crystalline polyamide having a melting temperature (Tm-B) below Tm-A, or a combination of the amorphous polyamide and the second semi-crystalline polyamide; (c) heating and melt-mixing polyamide (A) and polyamide (B), thereby obtaining a miscible polymer melt with a temperature (T-melt) above Tm-A; and (d) cooling the melt to a temperature below the solidification temperature of the melt, thereby obtaining a solid semi-crystalline semi-aromatic polyamide copolymer.

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