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US 2017/0362399 A1Published application
Acrylic polyvinyl acetal films, composition, and heat bondable articles
Assignee3M Innovative Properties Company
InventorsCorinne E. Lipscomb, Mary M. Caruso Dailey, Jonathan E. Janoski, Anthony F. Schultz
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Abstract
A film is described comprises a (meth)acrylic polymer and a polyvinyl acetal (e.g. butyral) resin. The film has a tensile elastic modulus of at least 1 MPa at 25° C. and 1 hertz and a glass transition temperature (i.e. Tg) less than 30 C. The film typically comprises photoinitiator as a result of the method by which the film was made. In one embodiment, the film is heat bondable and further comprising a backing.
Claims22
A film comprising:
- (meth)acrylic polymer and polyvinyl acetal resin comprising polymerized units having the following formula
- wherein R1 is hydrogen or a C1-C7 alkyl group;
- wherein the film has a tensile elastic modulus of at least 1 MPa at 25 C and 1 hertz and a Tg less than 30° C.
Dependencies are inferred from the claim text.