Acrylic polyvinyl acetal films and composition

US11629250B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Jonathan E. Janoski · Woodbury, US
• Anthony F. Schultz · Forest Lake, US
• Keith R. Lyon · Hudson, US
• Ronald S. Steelman · Woodbury, US
• Kevin M. Lewandowski · Inver Grove Heights, US
• Corinne E. Lipscomb · Windom, US
• Terry R. Hobbs · Windom, US
• Arlin L. Weikel · Roberts, US
• Jayshree Seth · Woodbury, US
• Duane D. Fansler · Dresser, US
• Hidetoshi Abe · Yamagata, JP

Key dates

• Filing date: Nov 19, 2020
• Grant date: Apr 18, 2023
• Expiry date: Aug 19, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J2467/005
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A film is described comprising a (meth)acrylic polymer and a polyvinyl acetal (e.g. butyral) resin. In some embodiments, the film has a glass transition temperature (i.e. Tg) ranging from 30° C. to 60° C. In some embodiments, the film has a gel content of at least 20% or greater. In some embodiments, the film has an elongation at break of at least 175%. The film typically comprises photoinitiator as a result of the method by which the film was made. The film may be a monolithic film or a layer of a multilayer film.