Patent · US Expired

Process for the preparation of polyvinylbutyral having improved properties

US4205146A · kind A · utility

17Cited by

1References

8Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hans D. Hermann · Bad Soden am Taunus, DE
Joachim Ebigt
Ulrich M. Hutten · Kelkheim, DE

Key dates

Filing date	Jul 18, 1978
Grant date	May 27, 1980
Priority date	—
Expiry date	Jul 18, 1998

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/3163
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The preparation of polyvinylbutyral is commonly effected by the acetalization of polyvinyl alcohol with n-butyraldehyde, either in an organic solvent or in water. By varying the reaction conditions it is possible to obtain the polyvinylbutyral in a coarse-grain or fine-grained form. The production of polyvinylbutyral having improved properties is possible by using a polyvinylbutyral having a content of from 17 to 24% by weight of vinyl alcohol units as starting material for an after-treatment in the presence of an organic sulfonic acid having an emulsifying effect. The polyvinylbutyral obtained is particularly suitable for the manufacture of compound sheets.

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