Pressure sensitive materials based on a multistep constituted of polymerizates

US6303726A · kind A · 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: Feb 9, 1999
• Grant date: Oct 16, 2001
• Expiry date: Feb 9, 2019

Classification

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

Abstract

A polymer which contains PA1 from 50 to 99.98% by weight of a C.sub.1 -C.sub.12 alkyl (meth)acrylate a), PA1 from 0.02 to 10% by weight of a vinylaromatic compound b), PA1 from 0 to 10% by weight of an ethylenically unsaturated acid or of an ethylenically unsaturated acid anhydride c), and PA1 from 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.