Oriented acrylic block copolymers

US6703441B2 · kind B2 · utility

Assignee

• tesa AG · DE

Inventors

• Marc Husemann · Hamburg, DE
• Thilo Dollase · Hamburg, DE

Key dates

• Filing date: Jul 24, 2002
• Grant date: Mar 9, 2004
• Expiry date: Jul 24, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An oriented pressure sensitively adhesive system comprising a pressure sensitive adhesive which is comprised of at least one block copolymer composed at least in part of (meth)acrylic acid derivatives, and at least one block copolymer comprising the unit P(A)-P(B)-P(A), whereP(A) independently of one another represent homopolymer blocks or copolymer blocks of monomers A, the polymer blocks P(A) each having a softening temperature in the range from +20° C. to +175° C.,P(B) represents a homopolymer block or copolymer block of monomers B, the polymer block P(B) having a softening temperature in the range from −130° C. to +10° C.,wherein the refractive index nMD measured in one direction is greater than the refractive index nCD measured in a direction perpendicular to that direction.