Pressure sensitive adhesive sheet for optics
Assignee3M Innovative Properties Company
InventorsToshihiro Suwa, Shogo Sakakibara, Sotaro Endo, Saori Ueda, Shunsuke Suzuki
Life of this patent
Estimating the term…
Abstract
An ultraviolet cross-linkable pressure sensitive adhesive sheet includes a (meth)acrylic copolymer of a monomer containing a (meth)acrylic acid ester having an ultraviolet cross-linkable site. The storage modulus of the pressure sensitive adhesive sheet before ultraviolet cross-linking is from 5.0×104 to 1.0×106 Pa at 30° C. and 1 Hz and 5.0×104 Pa or less at 80° C. and 1 Hz. The storage modulus of the pressure sensitive adhesive sheet after ultraviolet cross-linking is 1.0×103 Pa or more at 130° C. and 1 Hz.
Claims7
An ultraviolet cross-linkable pressure sensitive adhesive sheet comprising:
- a (meth)acrylic copolymer of a monomer containing a (meth)acrylic acid ester having an ultraviolet cross-linkable site,
- wherein the ultraviolet cross-linkable site has a benzophenone structure,
- wherein the storage modulus of the pressure sensitive adhesive sheet before ultraviolet cross-linking is from 5.0×104 to 1.0×106 Pa at 30° C. and 1 Hz and 5.0×104 Pa or less at 80° C. and 1 Hz, and
- wherein the storage modulus of the pressure sensitive adhesive sheet after ultraviolet cross-linking is 1.0×103 Pa or more at 130° C. and 1 Hz.
Dependencies are inferred from the claim text.