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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 12540439 B1

PDFFull Text
Date of Patent:
Feb. 03, 2026

Filed:

Oct. 16, 2020

Polypropylene coated paper and paperboard

Applicant:

Stora Enso Oyj, Helsinki, FI;

Inventor:

Ville Ribu, Lappeenranta, FI;

Assignee:

Stora Enso OYJ, Helsinki, FI;

Attorney:

Greer, Burns & Crain, Ltd.

Primary Examiner:

Yan Lan

Int. Cl.
CPC ...
D21H 19/22 (2006.01); B32B 27/08 (2006.01); B32B 27/10 (2006.01); B32B 27/20 (2006.01); B32B 27/32 (2006.01); B65D 81/34 (2006.01); C09D 123/12 (2006.01); D21H 19/58 (2006.01); D21H 21/34 (2006.01); D21H 23/46 (2006.01); D21H 27/10 (2006.01); B29C 48/154 (2019.01); B29K 23/00 (2006.01); B29K 711/12 (2006.01);
U.S. Cl.
CPC ...
D21H 19/22 (2013.01); B32B 27/08 (2013.01); B32B 27/10 (2013.01); B32B 27/20 (2013.01); B32B 27/32 (2013.01); B65D 81/3453 (2013.01); C09D 123/12 (2013.01); D21H 19/58 (2013.01); D21H 21/34 (2013.01); D21H 23/46 (2013.01); D21H 27/10 (2013.01); B29C 48/154 (2019.02); B29K 2023/12 (2013.01); B29K 2711/12 (2013.01); B32B 2307/306 (2013.01); B32B 2307/4026 (2013.01); B32B 2307/718 (2013.01); B32B 2307/72 (2013.01); B32B 2307/7246 (2013.01); B32B 2439/70 (2013.01);
Abstract

The present invention relates to paper or paperboard comprising cellulose fibers, said paper or paperboard comprising at least one coating layer formed by extrusion coating of a PP (polypropylene) resin, characterized in that the PP resin comprises at least 50% by weight of a branched PP copolymer having a density in the range of 890-910 kg/m(as determined according to ISO 1183), a melting temperature in the range of 155-170° C. (as determined according to ISO 11357-3), and a melt flow rate (230° C./2.16 kg) in the range of 10-15 g/10 min (as determined according to ISO 1133), and wherein the PP resin is applied to the paper or paperboard at a grammage of less than 30 g/m.

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