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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 9096711 B1

PDFFull Text
Date of Patent:
Aug. 04, 2015

Filed:

Apr. 28, 2010

Powder coating composition comprising a polyester and a crosslinker with oxirane groups providing improved corrosion resistance to a substrate coated therewith

Applicants:

Paulus Franciscus Anna Buijsen, Maassluis, NL;

Juul Cuijpers, Zwolle, NL;

Marcellinus Hermanus Johannes Schutte, Raalte, NL;

Johannes Albertus Hettinga, Zwolle, NL;

Inventors:

Paulus Franciscus Anna Buijsen, Maassluis, NL;

Juul Cuijpers, Zwolle, NL;

Marcellinus Hermanus Johannes Schutte, Raalte, NL;

Johannes Albertus Hettinga, Zwolle, NL;

Assignee:

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

Attorney:

Nixon & Vanderhye P.C.

Primary Examiner:

Vivian Chen

Int. Cl.
CPC ...
C08G 63/16 (2006.01); C08G 63/181 (2006.01); C08G 63/183 (2006.01); C08G 63/20 (2006.01); C08G 63/21 (2006.01); C08G 63/52 (2006.01); C08K 5/17 (2006.01); C08K 5/1515 (2006.01); C08K 5/49 (2006.01); C08K 5/50 (2006.01); C08L 67/02 (2006.01); C08L 67/03 (2006.01); C08L 67/08 (2006.01); C09D 5/03 (2006.01); C09D 167/02 (2006.01); C09D 167/03 (2006.01); C09D 167/08 (2006.01); C08K 5/00 (2006.01); C08K 5/19 (2006.01);
U.S. Cl.
CPC ...
C08G 63/20 (2013.01); C08G 63/16 (2013.01); C08G 63/181 (2013.01); C08G 63/183 (2013.01); C08G 63/21 (2013.01); C08G 63/52 (2013.01); C08K 5/0025 (2013.01); C08K 5/1515 (2013.01); C08K 5/17 (2013.01); C08K 5/19 (2013.01); C08K 5/49 (2013.01); C08K 5/50 (2013.01); C08L 67/02 (2013.01); C08L 67/03 (2013.01); C08L 67/08 (2013.01); C09D 5/03 (2013.01); C09D 5/033 (2013.01); C09D 167/02 (2013.01); C09D 167/03 (2013.01); C09D 167/08 (2013.01);
Abstract

The invention relates to a carboxylic acid functional branched polyester for thermosetting powder coating composition, wherein said polyester is prepared from at least the following monomers: a difunctional aromatic acid, the difunctional aromatic acid being a combination of terephthalic acid (TPA), isophthalic acid (IPA), an at least trifunctional monomer and a difunctional alcohol, the difunctional alcohol being a combination of at least ethylene glycol (EG) and/or diethylene glycol (DEG) and neopentyl glycol (NPG), the molar ratio of TPA to IPA in the carboxylic acid functional branched polyester is at most 12.4, and the functionality of the carboxylic acid functional branched polyester is from 2.15 to 4.0, and the carboxylic acid functional branched polyester has an acid value of from 14 to 80 mg KOH/g resin, and the carboxylic acid functional branched polyester has a glass transition temperature of at least 40C. The powder coating compositions of the present invention derived upon curing of the thermosetting powder coating compositions which comprise the polyester according to the invention together with a crosslinker with oxirane groups and an epoxy cure catalyst present good corrosion resistance to steel substrates. Furthermore, said low cost and corrosion resistant powder coatings may present good reverse impact resistance (RIR) and/or good smoothness.

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