Cloud point-resistant adhesives and laminates
First Claim
Patent Images
1. An optically clear laminate comprising:
- a first substrate having at least one major surface;
a second substrate having at least one major surface; and
a cloud point-resistant, optically clear adhesive composition situated between and in contact with at least one major surface of the first substrate and at least one major surface of the second substrate, wherein the adhesive composition is prepared by polymerizing a precursor mixture, the precursor mixture comprising;
from about 60 to about 95 parts by weight of an alkyl acrylate or a combination of alkyl acrylates having 1 to 14 carbon atoms in the alkyl group;
from greater than 0 to about 5 parts of a copolymerizable polar monomer; and
from about 5 to about 50 parts of a hydroxyl-containing monomer that has an OH equivalent weight of less than 400,wherein the laminate has a haze value of less than 5% and an average transmission between 450 nanometers and 650 nanometers of greater than about 85% after it is placed in an environment of at least 70°
C. and 90% relative humidity for 72 hours, cooled to room temperature, and measured.
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Accused Products
Abstract
Optically clear adhesives and laminates that include the adhesives are provided. The adhesives and laminates remain haze-free and are cloud point-resistant when placed in environments of high humidity and elevated temperature. The adhesives and laminates are useful in optical electronic display applications.
30 Citations
12 Claims
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1. An optically clear laminate comprising:
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a first substrate having at least one major surface; a second substrate having at least one major surface; and a cloud point-resistant, optically clear adhesive composition situated between and in contact with at least one major surface of the first substrate and at least one major surface of the second substrate, wherein the adhesive composition is prepared by polymerizing a precursor mixture, the precursor mixture comprising; from about 60 to about 95 parts by weight of an alkyl acrylate or a combination of alkyl acrylates having 1 to 14 carbon atoms in the alkyl group; from greater than 0 to about 5 parts of a copolymerizable polar monomer; and from about 5 to about 50 parts of a hydroxyl-containing monomer that has an OH equivalent weight of less than 400, wherein the laminate has a haze value of less than 5% and an average transmission between 450 nanometers and 650 nanometers of greater than about 85% after it is placed in an environment of at least 70°
C. and 90% relative humidity for 72 hours, cooled to room temperature, and measured.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12)
wherein the laminate does not display bubble, delaminate or turn hazy after the laminate is exposed to environmental conditions of either 1 week at 60° - C. and 90% relative humidity or 1 week at 85°
C. in a dry environment.
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8. A laminate according to claim 7, wherein at least one of the substrates is polycarbonate or poly(methyl)methacrylate.
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12. An optically clear laminate according to claim 1, wherein the haze value is less than 2%.
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9. An optically clear laminate comprising:
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a first substrate having at least one major surface; a second substrate having at least one major surface; and a cloud point-resistant, optically clear adhesive composition situated between and in contact with at least one major surface of the first substrate and at least one major surface of the second substrate, wherein the adhesive composition is prepared by polymerizing a precursor mixture, the precursor mixture comprising; from about 60 to about 95 parts by weight of an alkyl acrylate or a combination of alkyl acrylates having 1 to 14 carbon atoms in the alkyl group, wherein the alkyl acrylate or a combination of alkyl acrylates include isobornyl (meth)acrylate; and from about 15 to about 50 parts of a hydroxyl-containing monomer that has an OH equivalent weight of less than 400, wherein the laminate has a haze value of less than 5% and an average transmission between 450 nanometers and 650 nanometers of greater than about 85% after it is placed in an environment of at least 70°
C. and 90% relative humidity for 72 hours, cooled to room temperature, and measured. - View Dependent Claims (10, 11)
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Specification