Pressure sensitive adhesive composition including ultraviolet light-absorbing oligomer
Assignee3M Innovative Properties Company
InventorsDavid B. Olson, Patricia M. Savu, Diane North, Jordan C. DuCharme
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Abstract
A composition that includes a blend of a pressure sensitive adhesive and an ultraviolet light-absorbing oligomer. The oligomer has a first divalent unit having a pendent ultraviolet absorbing group and a second divalent unit represented by formula in which R1 is hydrogen or methyl, and R2 is alkyl having from 4 to 20 carbon atom. Articles including the composition are disclosed. For example, an assembly including a barrier film and the composition is also disclosed.
Claims19
A composition comprising a blend of a pressure sensitive adhesive and an ultraviolet light-absorbing oligomer, wherein the ultraviolet light-absorbing oligomer comprises:
- first divalent units comprising a pendent ultraviolet absorbing group, wherein the pendent ultraviolet absorbing group comprises a triazine, a benzophenone, or a benzotriazole;
- and
- second divalent units represented by formula:
- wherein
- R1 is hydrogen or methyl;
- and
- R2 is alkyl having 8 carbon atoms,
- wherein the second divalent units are present in the ultraviolet light-absorbing oligomer at 70 percent by weight up to 90 percent by weight, based on the total weight of the oligomer, wherein the pressure sensitive adhesive is an acrylic pressure sensitive adhesive comprising an acrylic polymer, wherein the second divalent units are present in the acrylic polymer in an amount of 80 percent by weight up to 100 percent by weight, based on the total weight of the acrylic polymer, wherein the ultraviolet absorbing group is in the composition in an amount of at least 2 percent by weight and in an amount of up to 10 weight percent, based on the total weight of the composition, and wherein the pressure sensitive adhesive does not comprise a third divalent unit comprising a pendent hydroxyl group.
An assembly comprising:
- a first polymeric film substrate having a first surface and a second surface opposite the first surface;
- a barrier film disposed on the first surface of the first polymeric film;
- a pressure sensitive adhesive layer having a first surface and a second surface opposite the first surface, wherein the first surface of the pressure sensitive adhesive layer is disposed on the barrier film opposite the first polymeric film substrate;
- and
- a second polymeric film substrate disposed on the second surface of the pressure sensitive adhesive layer,
- wherein the pressure sensitive adhesive layer comprises a blend of a pressure sensitive adhesive and an ultraviolet light-absorbing oligomer, wherein the ultraviolet light-absorbing oligomer comprises:
- first divalent units comprising a pendent ultraviolet absorbing group, wherein the pendent ultraviolet absorbing group comprises a triazine, a benzophenone, or a benzotriazole;
- and
- second divalent units represented by formula:
- wherein
- R1 is hydrogen or methyl;
- and
- R2 is alkyl having 8 carbon atoms,
- wherein the second divalent units are present in the ultraviolet light-absorbing oligomer at 70 percent by weight up 90 percent by weight, based on the total weight of the oligomer, wherein the pressure sensitive adhesive is an acrylic pressure sensitive adhesive comprising an acrylic polymer, wherein the second divalent units are present in the acrylic polymer in an amount of 80 percent by weight up to 100 percent by weight, based on the total weight of the acrylic polymer, wherein the ultraviolet absorbing group is in the pressure sensitive adhesive layer in an amount of at least 2 percent by weight and in an amount up to 10 weight percent, based on the total weight of the pressure sensitive adhesive layer, and wherein the pressure sensitive adhesive does not comprise a third divalent unit comprising a pendent hydroxyl group.
Dependencies are inferred from the claim text.