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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 10899059 B1

PDFFull Text
Date of Patent:
Jan. 26, 2021

Filed:

Apr. 26, 2018

Method for producing films based on plasticized polyvinyl acetal having a predefined viscosity

Applicant:

Kuraray Europe Gmbh, Hattersheim, DE;

Inventors:

Michael Haerth, Troisdorf, DE;

Daniel Wenzlik, Wiesbaden, DE;

Assignee:

KURARAY EUROPE GmbH, Hattersheim, DE;

Attorney:

Brooks Kushman P.C.

Primary Examiner:

Jeffrey M Wollschlager

Int. Cl.
CPC ...
B29C 48/00 (2019.01); B29C 48/21 (2019.01); B29C 48/92 (2019.01); B32B 17/10 (2006.01); B29C 48/72 (2019.01); C08J 3/18 (2006.01); C08J 5/18 (2006.01); B29K 29/00 (2006.01); B29K 31/00 (2006.01); B29K 105/00 (2006.01);
U.S. Cl.
CPC ...
B29C 48/022 (2019.02); B29C 48/00 (2019.02); B29C 48/21 (2019.02); B29C 48/72 (2019.02); B29C 48/92 (2019.02); B32B 17/10605 (2013.01); B32B 17/10761 (2013.01); C08J 3/18 (2013.01); C08J 5/18 (2013.01); B29C 2948/922 (2019.02); B29C 2948/92361 (2019.02); B29C 2948/92695 (2019.02); B29C 2948/92704 (2019.02); B29C 2948/92857 (2019.02); B29C 2948/92876 (2019.02); B29C 2948/92961 (2019.02); B29K 2029/14 (2013.01); B29K 2031/04 (2013.01); B29K 2105/0038 (2013.01); B29K 2829/14 (2013.01); C08J 2329/14 (2013.01);
Abstract

Plasiticized polyvinylacetal films with greater film-to-film uniformity are produced by a process of extruding a melt stream containing a polyvinyl acetal and a plasticizer at 150-250° C., the film having a predefined melt viscosity at 60-170° C., by providing a first melt stream of at least a first plasticizer and a first polyvinyl acetal resin and measuring its melt viscosity at 60-170° C. online; and adjusting the 60-170° C. melt viscosity by adding a second plasticizer and/or a second polyvinyl acetal resin to the first melt stream in an amount to provide a second melt stream with a melt viscosity at 60-170° C. having a difference of at most 20% to the predefined melt viscosity at 60-170° C.

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