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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 10493700 B1

PDFFull Text
Date of Patent:
Dec. 03, 2019

Filed:

Jan. 22, 2015

Methods for lowering melt viscosity and improving heat-sealability of polyester and for manufacturing a heat-sealed container or package

Applicant:

Stora Enso Oyj, Helsinki, FI;

Inventors:

Kimmo Nevalainen, Kotka, FI;

Ville Ribu, Lappeenranta, FI;

Jari Räsänen, Imatra, FI;

Outi Kylliainen, Imatra, FI;

Ari Rosling, Turku, FI;

Mohammad Khajeheian, Turku, FI;

Jurkka Kuusipalo, Tampere, FI;

Sami Kotkamo, Tampere, FI;

Mikko Tuominen, Tampere, FI;

Assignee:

Stora Enso OYJ, Helsinki, FI;

Attorney:

Greer, Burns & Crain Ltd.

Primary Examiner:

Daniel H Lee

Int. Cl.
CPC ...
B29C 65/00 (2006.01); B29C 71/04 (2006.01); B32B 27/10 (2006.01); B29C 65/02 (2006.01); B32B 27/36 (2006.01); D21H 25/04 (2006.01); D21H 27/10 (2006.01); D21H 19/28 (2006.01); B29C 35/08 (2006.01); B29K 67/00 (2006.01); B29L 31/00 (2006.01);
U.S. Cl.
CPC ...
B29C 66/73121 (2013.01); B29C 35/0805 (2013.01); B29C 65/02 (2013.01); B29C 66/028 (2013.01); B29C 66/4322 (2013.01); B29C 66/71 (2013.01); B29C 66/72328 (2013.01); B29C 66/851 (2013.01); B29C 71/04 (2013.01); B32B 27/10 (2013.01); B32B 27/36 (2013.01); D21H 19/28 (2013.01); D21H 25/04 (2013.01); D21H 27/10 (2013.01); B29C 2035/0827 (2013.01); B29C 2035/0877 (2013.01); B29K 2067/00 (2013.01); B29K 2067/003 (2013.01); B29K 2067/046 (2013.01); B29L 2031/7132 (2013.01); B32B 2270/00 (2013.01); B32B 2307/31 (2013.01); B32B 2307/7163 (2013.01); B32B 2307/7244 (2013.01); B32B 2307/7246 (2013.01); B32B 2439/70 (2013.01);
Abstract

The invention relates to methods for lowering the melt viscosity and thereby improving heat-sealability of a polyester. The invention also relates to a method for manufacturing a heat-sealed container or package from fibrous-based, polyester-coated packaging material, and a method for heat-sealing polyester. The solution according to the invention is subjecting polyester to electron beam (EB) radiation. The lowered melt viscosity allows a lower heat-sealing temperature, and permits sealing of polyester to an uncoated fibrous surface. The preferred polyester for the invention is polylactide, as such or as blended with another polyester.

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