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.:
Date of Patent:
Apr. 13, 2021
Filed:
Jan. 10, 2019
Applicant:
Solenis Technologies, L.p., Wilmington, DE (US);
Inventors:
Ashley Hawkins Lewis, Wilmington, DE (US);
Mark Tracey Crisp, Leusden, NL;
Assignee:
SOLENIS TECHNOLOGIES, L.P., Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 17/55 (2006.01); D21H 17/36 (2006.01); D21H 17/67 (2006.01); D21H 21/20 (2006.01); D21H 21/28 (2006.01); D21H 17/37 (2006.01); D21H 27/30 (2006.01); D21H 27/26 (2006.01); D21H 17/20 (2006.01);
U.S. Cl.
CPC ...
D21H 17/55 (2013.01); D21H 17/20 (2013.01); D21H 17/36 (2013.01); D21H 17/375 (2013.01); D21H 17/67 (2013.01); D21H 17/675 (2013.01); D21H 21/20 (2013.01); D21H 21/28 (2013.01); D21H 27/26 (2013.01); D21H 27/30 (2013.01);
Abstract
A process is disclosed for making paper having improved filler retention and opacity. The process includes the step of adding Additive A and Additive B to a slurry in a wet end of a paper machine wherein the slurry comprises pulp and a filler. Additive A is a wet strength agent. Additive B is an anionic polymer having a charge density from about −3000 to about −7000 ueq/g on a dry basis when measured in a buffer having a pH of about 6. Additive B also has a weight average molecular weight of from about 150,000 to about 1,000,000, Daltons.