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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 10150232 B1

PDFFull Text
Date of Patent:
Dec. 11, 2018

Filed:

Apr. 12, 2017

Process for producing articles formed from polylactic acid and articles made therefrom

Applicant:

W. L. Gore & Associates, Inc., Newark, DE (US);

Inventors:

Guy A. Sbriglia, Christiana, PA (US);

Scott A. Gore, Newark, DE (US);

Assignee:

W. L. Gore & Associates, Inc., Newark, DE (US);

Attorney:

Amy L. Miller

Primary Examiner:

Irina S Zemel

Int. Cl.
CPC ...
B29C 43/00 (2006.01); C08J 9/28 (2006.01); C08G 63/08 (2006.01); B29C 55/00 (2006.01); B29C 44/34 (2006.01); B29C 43/24 (2006.01); B29C 43/52 (2006.01); B29C 55/04 (2006.01); C08J 9/24 (2006.01); B29C 44/30 (2006.01); C08J 9/00 (2006.01); B29K 33/04 (2006.01); B29K 105/04 (2006.01); B29C 47/00 (2006.01); B29K 67/00 (2006.01); B29C 55/02 (2006.01); B29K 105/00 (2006.01); C08G 101/00 (2006.01); C08J 9/36 (2006.01);
U.S. Cl.
CPC ...
B29C 43/003 (2013.01); B29C 43/24 (2013.01); B29C 43/52 (2013.01); B29C 44/30 (2013.01); B29C 44/348 (2013.01); B29C 55/005 (2013.01); B29C 55/04 (2013.01); C08G 63/08 (2013.01); C08J 9/0014 (2013.01); C08J 9/0066 (2013.01); C08J 9/24 (2013.01); C08J 9/28 (2013.01); B29C 47/0004 (2013.01); B29C 55/02 (2013.01); B29K 2033/04 (2013.01); B29K 2067/046 (2013.01); B29K 2105/04 (2013.01); B29K 2105/041 (2013.01); B29K 2105/251 (2013.01); B29K 2995/006 (2013.01); B29K 2995/0077 (2013.01); C08G 2101/00 (2013.01); C08J 9/365 (2013.01); C08J 2201/03 (2013.01); C08J 2205/052 (2013.01); C08J 2367/04 (2013.01); C08J 2467/04 (2013.01);
Abstract

PLA polymers that can be expanded into microporous articles having a node and fibril microstructure are provided. The fibrils contain PLA polymer chains oriented with the fibril axis. Additionally, the PLA polymers have an inherent viscosity greater than about 3.8 dL/g and a calculated molecular weight greater than about 150,000 g/mol. The PLA polymer article may be formed by bulk polymerization where the PLA bulk polymer is made into a preform that is subsequently expanded at temperatures above the glass transition temperature and below the melting point of the PLA polymer. In an alternate embodiment, a PLA polymer powder is lubricated, the lubricated polymer is subjected to pressure and compression to form a preform, and the preform is expanded to form a microporous article. Both the preform and the microporous article are formed at temperatures above the glass transition temperature and below the melting point of the PLA polymer.

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