Pressure-sensitive adhesive dispersion comprising polymers with ureido groups or with ureido-analogous groups and prepared by stage polymerization

US9365745B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Matthias Gerst · Maikammer, DE
• Dirk Wulff · Schifferstadt, DE
• Thomas Christ · Auburn Hills, US

Key dates

• Filing date: Apr 10, 2012
• Grant date: Jun 14, 2016
• Expiry date: Apr 18, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2887
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A description is given of a pressure-sensitive adhesive dispersion comprising a water-dispersed polymer P1 formed by emulsion polymerization. The polymer P1 is formed from a monomer mixture comprising (a) at least 40% by weight of C4 to C20 alkyl (meth)acrylates which when polymerized as homopolymers have a glass transition temperature of −30° C. or less, (b) at least 0.05% by weight of (meth)acrylate monomers having a substituent of the formulawhere X is CH2, O, NH or NR and R is a C1 to C4 alkyl group, (c) at least 0.1% by weight of acid monomers. The polymer P1 is prepared by polymerization in at least 2 stages, the glass transition temperature of a polymer from monomers of the first stage being lower by at least 20° C. than the glass transition temperature of a polymer from monomers of a later, second stage.