Pressure sensitive adhesives based on polymers of multistage construction

US6583252B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Bernhard Schuler · Austin, US
• Gerhard Auchter · Bad Dürkheim, DE
• Johannes Turk · Böhl-Iggelheim, DE
• Rik Noordijk · Schifferstadt, DE
• Johannes Dobbelaar · Monsheim, DE
• Reinhard Bacher · Bad Dürkheim, DE
• Wolfgang Hümmer · Birkenheide, DE

Key dates

• Filing date: May 21, 2001
• Grant date: Jun 24, 2003
• Expiry date: May 21, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2826
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polymer composed overall offrom 50 to 99.98% by weight of C1-C12 alkyl (meth)acrylate a),from 0.02 to 10% by weight of a vinylaromatic compound b),from 0 to 10% by weight of an ethylenically unsaturated acidor of an ehtylenically unsaturated acid anhydride c), andfrom 0 to 40% by weight of further monomers d),the percentages by weight being based on the polymer and the polymer being obtainable by polymerizing the monomers a) to d) in at least two stages which differ in their content of vinylaromatic compounds in such a way that the content of vinylaromatic compounds in the vinylaromatics-rich stage is at least 5 times as great as in the low-vinylaromatics stage.