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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 10632660 B1

PDFFull Text
Date of Patent:
Apr. 28, 2020

Filed:

Jan. 11, 2018

Method to improve optical properties of stabilized polycarbonate compositions

Applicant:

Sabic Global Technologies B.v., Bergen op Zoom, NL;

Inventors:

Kevin Wassmer, Poseyville, IN (US);

Franklin Ehrensbeck, Evansville, IN (US);

Robert Russell Gallucci, Mt. Vernon, IN (US);

William E. Hollar, Jr., Mt. Vernon, IN (US);

Assignee:

SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom, NL;

Attorney:

Cantor Colburn LLP

Primary Examiner:

Mathieu D Vargot

Int. Cl.
CPC ...
B29C 48/00 (2019.01); B29C 45/00 (2006.01); B29C 48/05 (2019.01); B29C 33/62 (2006.01); C08L 69/00 (2006.01); C08K 5/00 (2006.01); C08K 5/3475 (2006.01); C08K 5/357 (2006.01); B29C 48/793 (2019.01); B29C 48/88 (2019.01); C08J 3/12 (2006.01); G02B 1/04 (2006.01); B29B 9/16 (2006.01); B29B 7/88 (2006.01); B29B 7/00 (2006.01); B29B 9/06 (2006.01); B29L 11/00 (2006.01); B29K 69/00 (2006.01); B29B 7/46 (2006.01);
U.S. Cl.
CPC ...
B29C 48/05 (2019.02); B29B 7/007 (2013.01); B29B 7/88 (2013.01); B29B 9/06 (2013.01); B29B 9/16 (2013.01); B29C 33/62 (2013.01); B29C 45/0001 (2013.01); B29C 48/0013 (2019.02); B29C 48/0022 (2019.02); B29C 48/793 (2019.02); B29C 48/911 (2019.02); C08J 3/12 (2013.01); C08K 5/005 (2013.01); C08K 5/0041 (2013.01); C08K 5/3475 (2013.01); C08K 5/357 (2013.01); C08L 69/00 (2013.01); G02B 1/04 (2013.01); G02B 1/041 (2013.01); B29B 7/46 (2013.01); B29C 2948/92209 (2019.02); B29C 2948/92247 (2019.02); B29K 2069/00 (2013.01); B29L 2011/0016 (2013.01); C08J 2369/00 (2013.01); C08L 2201/10 (2013.01);
Abstract

Methods for producing transparent polycarbonate articles include melting a composition at a temperature of 300 to 390° C., extruding the melted composition to form a strand, cooling the strand of extruded composition, cutting the cooled strand into pellets, drying the pellets at a temperature of 50 to 140° C. and injecting molding or extruding the pellets at a temperature of 300 to 380° C. to form an article. The composition can comprise a moisture content of 0.1 to 5 wt. % and a crystalline additive having a melting point of at least 280° C., a heat of fusion greater than or equal to 1.0 Joule/gram (J/g). The composition can be cooled to at least 20° C. below the glass transition temperature of the polycarbonate.

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