UV-crosslinkable acrylic hotmelt PSAs with narrow molecular weight distribution

US6720399B2 · kind B2 · utility

Assignee

• tesa AG · DE

Inventors

• Marc Husemann · Hamburg, DE
• Stephan Zollner · Hamburg, DE

Key dates

• Filing date: Jul 17, 2002
• Grant date: Apr 13, 2004
• Expiry date: Jul 17, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2857
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polyacrylate pressure sensitive adhesive, havingan average molecular weight Mw (weight average) of from 100 000 to 600 000 g/mola polydispersity of not more than 3.0copolymerized photoinitiator units, anda process for preparing a UV-crosslinkable polyacrylate pressure sensitive adhesive having a polydispersity of not more 3.0, comprisinga radical polymerization process for preparing a polymer from a monomer mixture,the monomer mixture to be polymerized comprising copolymerizable photoinitiators,the polymerization process being regulated by the presence of at least one chemical compound comprising the unit in which X is S, O or N as polymerization regulator.