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US 8,772,425 B2Granted
High refractive index pressure-sensitive adhesives
Assignee3M Innovative Properties Company
InventorsMichael D. Determan, Albert I. Evaraerts, Cheryl L. Moore, David B. Olson
Life of this patent
Estimating the term…
Abstract
The present invention provides pressure-sensitive adhesives having a refractive index of at least 1.50. The pressure-sensitive adhesives comprise at least one monomer containing a substituted or an unsubstituted biphenyl group.
Claims12
An adhesive article comprising:
- a flexible or inflexible substrate;
- and
- a pressure sensitive adhesive coated on the substrate, the pressure sensitive adhesive comprising:
- a random copolymer having:
- a) 10 to 90 parts by weight of monomer units having pendent biphenyl groups;
- b) 90 to 10 parts by weight of alkyl (meth)acrylate monomer units;
- c) 1 to 15 parts by weight of acid functional monomer units;
- d) 0 to 15 parts by weight of polar monomers;
- and
- e) 0 to 5 parts by weight of other monomers,
- wherein the sum of the monomers is 100 parts by weight;
- and
- optionally a plasticizer, wherein the monomer units having pendent biphenyl groups are of the formula:
- wherein
- X1 and X2 are each independently —O—, —S—, or —NR3—, where R3 is H or C1-C4 alkyl;
- R1 is an alkylene of 1 to 8 carbons optionally containing one or more catenary ether oxygen atoms or pendent hydroxy groups;
- n is 0 or 1;
- and
- R2 is either H or CH3;
- such that when n is 0, the biphenyl group comprises 2-substituted biphenyl, and wherein the monomer units having pendent biphenyl groups have as homopolymers a glass transition temperature of 70° C. or less.
17 more elements
A pressure sensitive adhesive comprising a random copolymer having:
- a) 10 to 90 parts by weight of monomer units having pendent biphenyl groups;
- b) 90 to 10 parts by weight of alkyl (meth)acrylate monomer units;
- c) 1 to 15 parts by weight of acid functional monomer units;
- d) 0 to 15 parts by weight of polar monomers;
- and
- e) 0 to 5 parts by weight of other monomers,
- wherein the sum of the monomers is 100 parts by weight;
- and
- optionally a plasticizer, wherein the monomer units having pendent biphenyl groups are of the formula:
- wherein
- X1 and X2 are each independently —O—, —S—, or —NR3—, where R3 is H or C1-C4 alkyl;
- R1 is an alkylene of 1 to 8 carbons optionally containing one or more catenary ether oxygen atoms or pendent hydroxy groups;
- n is 0 or 1;
- and
- R2 is either H or CH3;
- such that when n is 0, the biphenyl group comprises 2-substituted biphenyl, and wherein the monomer units having pendent biphenyl groups have as homopolymers a glass transition temperature of 70° C. or less;
- and further comprising at least one additive.
14 more elements
Dependencies are inferred from the claim text.