Patent · US Expired

Polyvinylacetal-grafted polymers

US6734246B2 · kind B2 · utility

1Cited by

3References

15Claims

0Family size

Assignee

WACKER POLYMER SYSTEMS GMBH & CO. KG · DE

Inventors

Hans-Peter Weitzel · Reischach, DE
Peter Ball · Emmerting, DE
Peter Tschirner · Emmerting, DE

Key dates

Filing date	Nov 9, 2001
Grant date	May 11, 2004
Priority date	—
Expiry date	May 23, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F261/04
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Polyvinylacetal-grafted polymers in the form of their aqueous dispersions or water-redispersible powders, and based on emulsion or suspension polymerized base polymers of one or more monomers from the group consisting of vinyl esters, (meth)acrylates, vinylaromatics, olefins, 1,3-dienes and vinyl halides, and optionally, further monomers copolymerizable therewith, the base polymers grafted with polyvinylacetals having from 0 to 5.0 mol % of vinyl acetate units, from 75 to 95 mol % of vinyl alcohol units and from 0.1 to 20 mol % of acetal units which are derived from aldehydes having 3 to 7 C atoms, are useful as additives in construction compositions, as binders, and as adhesives, and may be dried to form readily water-redispersible polymer powders.

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