Patent · US Expired

Method for producing polyvinylacetals

US7351765B2 · kind B2 · utility

3Cited by

4References

10Claims

0Family size

Assignee

WACKER POLYMER SYSTEMS GMBH & CO. KG · DE

Inventors

Kurt Stark · Schaffhausen, CH
Peter Tschirner · Emmerting, DE
Karl-Heinz Eichel · Burghausen, DE
Georg Friedl · Burghausen, DE
Franz Eichberger · Mattighofen, AT

Key dates

Filing date	Sep 4, 2003
Grant date	Apr 1, 2008
Priority date	—
Expiry date	Feb 15, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31833
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Polyvinyl acetals are obtained in a cost-effective and environmentally advantageous manner by employing as at least a portion of the aqueous acetalization medium, the mother liquor from a previous acetalization reaction.

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