Optical adhesive coating having low refractive index
AssigneeAvery Dennison Corporation
InventorsDaniel Holguin, Eng Pi Chang
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Abstract
This invention is directed to optical adhesives useful in light transmitting devices, and more particularly to fluorosubstituted monoacrylate based adhesives having low refractive index. The optical adhesive of the present invention is soluble in organic solvents, and in particular, in non-fluorinated organic solvents. The polymer of the optical adhesive of the present invention has a low glass transition temperature and has the ability to bond well with substrates, including glass substrates and polyethylene terephthalate polyester film substrates typically used in optical devices. The invention is further directed to transfer tapes comprised of at least one layer of a fluorosubstituted monoacrylate based adhesive.
Claims30
An optical adhesive having a refractive index of less than 1.40 comprising a transparent polymer comprising:
- 75-100% by weight, based on the total weight of the polymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 is a linear or branched fluoroalkyl group having 2 to 14 carbon atoms, wherein the at least one fluorosubstituted monoacrylate comprises hexafluoroisopropyl acrylate;
- and
- 0-5% by weight, based on the total weight of the polymer of an ethylenically unsaturated comonomer selected from the group consisting of (a) mono- and di-carboxylic acids, (b) hydroxyalkyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers.
A transfer tape comprising an optical pressure-sensitive adhesive layer and a carrier layer, wherein the optical pressure-sensitive adhesive has a refractive index of less than 1.40 and comprises a transparent polymer comprising:
- 75-100% by weight, based on the total weight of the polymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 is a linear or branched fluoroalkyl group having 2 to 14 carbon atoms, wherein the at least one fluorosubstituted monoacrylate comprises hexafluoroisopropyl acrylate;
- and
- 0-5% by weight, based on the total weight of the polymer of an ethylenically unsaturated comonomer selected from the group consisting of(a) mono- and di-carboxylic acids, (b) hydroxylalkyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers.
An optical adhesive having a refractive index of less than 1.40 comprising a transparent polymer comprising:
- 75-100% by weight, based on the total weight of the polymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 a linear or branched fluoroalkyl group having 2 to 14 carbon atoms;
- up to about 5% by weight, based on the total weight of the polymer of one or more ethylenically unsaturated comonomer selected from the group consisting of (a) mono- and di-carboxylic acids, (b) hydroxyalkyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers;
- and
- one or more chemical crosslinking agent.
An optical adhesive having a refractive index of less than 1.40 comprising a crosslinked transparent polymer comprising:
- 75-100% by weight, based on the total weight of the polymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 is a linear or branched fluoroalkyl group having 2 to 14 carbon atoms;
- and
- up to about 5% by weight, based on the total weight of the polymer of an ethylenically unsaturated comonomer selected from the group consisting of (a) mono- and di-carboxylic acids, (b) hydroxyalkyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers.
An optical adhesive having a refractive index of less than 1.40 comprising a transparent copolymer comprising:
- 75-100% by weight, based on the total weight of the copolymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 is a linear or branched fluoroalkyl group having 2 to 14 carbon atoms;
- 0-5% by weight, based on the total weight of the copolymer of an ethylenically unsaturated comonomer selected from the group consisting of (a) mono- and di-carboxylic acids, (b) hydroxyalkyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers;
- and
- one or more perfluoroalkyl ethylene.
A transfer tape comprising an optical pressure-sensitive adhesive layer and a carrier layer, wherein the optical pressure-sensitive adhesive has a refractive index of less than 1.40 and comprises a transparent polymer comprising:
- 75-100% by weight, based on the total weight of the polymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 is a linear or branched fluoroalkyl group having 2 to 14 carbon atoms;
- up to about 5% by weight, based on the total weight of the polymer of an ethylenically unsaturated comonomer selected from the group consisting of (a) mono- and di-carboxylic acids, (b) hydroxylalkyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers;
- and
- one or more chemical crosslinking agent.
A transfer tape comprising an optical pressure-sensitive adhesive layer and a carrier layer, wherein the optical pressure-sensitive adhesive has a refractive index of less than 1.40 and comprises a crosslinked transparent polymer comprising:
- 75-100% by weight based on the total weight of the polymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 a linear or branched fluoroalkyl group having 2 to 14 carbon atoms;
- and
- up to about 5% by weight, based on the total weight of the polymer of an ethylenically unsaturated comonomer selected from the group consisting of (a) mono- and di-carboxylic acids, (b) hydroxylailcyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers.
A transfer tape comprising an optical pressure-sensitive adhesive layer and a carrier layer, wherein the optical pressure-sensitive adhesive has a refractive index of less than 1.40 and comprises a transparent polymer comprising:
- 75-100% by weight, based on the total weight of the polymer of at least one fluorosubstituted monoacrylate comonomer of the formula:
- wherein R1 is hydrogen and R2 a linear or branched fluoroalkyl group having 2 to 14 carbon atoms;
- 0-5% by weight, based on the total weight of the polymer of an ethylenically unsaturated comonomer selected from the group consisting of (a) mono- and di-carboxylic acids, (b) hydroxylalkyl monomers, (c) epoxy monomers, (d) carboxylic amides, and (e) N-vinyl lactam monomers;
- and
- one or more perfluoroalkyl ethylene.
Dependencies are inferred from the claim text.