Patent · US Expired

Polyvinyl acetals with improved adhesion

US6870009B2 · kind B2 · utility

3Cited by

7References

20Claims

0Family size

Assignee

WACKER POLYMER SYSTEMS GMBH & CO. KG · DE

Inventors

Kurt Stark · Schaffhausen, CH
Bernhard Glaser · Ismaning, DE
Werner Bauer · Neuötting, DE
Peter Tschirner · Emmerting, DE

Key dates

Filing date	Aug 13, 2002
Grant date	Mar 22, 2005
Priority date	—
Expiry date	Sep 23, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F8/28
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Low molecular weight polyvinyl acetals have a solution viscosity of from 2 to 12 mPas and a degree of polymerization Pw less than 200, and are obtained by hydrolyzing a vinyl ester polymer having a solution viscosity of from 1.0 to 1.6 mPas until the content of vinyl alcohol units is ≧50 mol %, to produce a polyvinyl alcohol whose solution viscosity is from 1.0 to 2.0 mPas, and then acetalizing the resultant polyvinyl alcohol. The products may be used as binders and films of increased adhesion to substrates.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.