Patent · US Expired

Dispersions for pressure sensitive adhesives containing alkyl (meth) acrylates

US5556922A · kind A · utility

3Cited by

4References

20Claims

0Family size

Assignee

Roehm GmbH Chemische Fabrik · DE

Inventors

Gunther Mueller · Gernsheim, DE
Herbert Fink · Emmelshausen, DE
Joachim Heyne · Schifferstadt, DE

Key dates

Filing date	Aug 25, 1994
Grant date	Sep 17, 1996
Priority date	—
Expiry date	Aug 25, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S525/902
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A method for preparing a dispersion for a pressure sensitive adhesive is provided, wherein the dispersions contain a copolymer (CP) having units of butyl acrylate and (meth)acrylic acid, the method involving the steps of polymerizing an aqueous emulsion (EM) containing butyl acrylate, an anionic emulsifier and a non-ionic emulsifier, in the aqueous phase, under heating and in the presence of at least one water-soluble initiator (IN) of formula (I) EQU M R.sub.1 (I) where M represents a metal cation, and R1 represents an anion of a peroxyacid or azo-group-containing acid, wherein (IN) is present in an amount of 0.5-1.5 wt. % (based on weight of the monomers); emulsifying-in (meth)acrylic acid while maintaining an elevated reaction temperature; and adding a second initiator (RI) to complete the polymerization.

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