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 derived from a precursor composition comprising;
from about 60 to about 95 parts by weight of an alkyl acrylate having 1 to 14 carbon atoms in the alkyl group;
from about 5 to about 50 parts by weight of a hydroxyl-containing monomer that has an OH equivalent weight of less than 400;
wherein at an adhesive composition thickness of about 175 μ
m, the laminate has a haze value of less than about 5% and an average transmission between 450 nanometers and 650 nanometers of greater than about 85% and the adhesive composition does not separate into an adhesive phase and a water phase after the laminate 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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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
23 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 derived from a precursor composition comprising; from about 60 to about 95 parts by weight of an alkyl acrylate having 1 to 14 carbon atoms in the alkyl group; from about 5 to about 50 parts by weight of a hydroxyl-containing monomer that has an OH equivalent weight of less than 400; wherein at an adhesive composition thickness of about 175 μ
m, the laminate has a haze value of less than about 5% and an average transmission between 450 nanometers and 650 nanometers of greater than about 85% and the adhesive composition does not separate into an adhesive phase and a water phase after the laminate 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, 9, 10, 11, 12, 13, 14, 15)
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16. 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 derived from a precursor composition comprising; from about 60 to about 95 parts by weight of an alkyl acrylate having 1 to 14 carbon atoms in the alkyl group; from about 5 to about 50 parts by weight of a hydroxyl-containing monomer that has an OH equivalent weight of less than 400; and 0 to about 5 parts by weight of a copolymerizable polar monomer; wherein at an adhesive composition thickness of about 175 μ
m, the laminate has a haze value of less than about 5% and an average transmission between 450 nanometers and 650 nanometers of greater than about 85% and the adhesive composition does not separate into an adhesive phase and a water phase after the laminate is placed in an environment of at least 70°
C. and 90% relative humidity for 72 hours, cooled to room temperature within minutes, and measured. - View Dependent Claims (17, 18, 19, 20, 21)
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22. 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 pressure sensitive 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 pressure sensitive adhesive composition is derived from a precursor composition comprising; from about 60 to about 95 parts by weight of an alkyl acrylate having 1 to 14 carbon atoms in the alkyl group; from about 5 to about 50 parts by weight of a hydroxyl-containing monomer that has an OH equivalent weight of less than 400; and 0 to about 5 parts by weight of a copolymerizable polar monomer; wherein at an adhesive composition thickness of about 175 μ
m, the laminate has a haze value of less than about 5% and an average transmission between 450 nanometers and 650 nanometers of greater than about 85% and the adhesive composition does not separate into an adhesive phase and a water phase after the laminate 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 (23)
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Specification
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Current Assignee3M Innovative Properties Company (3M Company)
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Original Assignee3M Innovative Properties Company (3M Company)
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InventorsEveraerts, Albert I., Xia, Jianhui
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Primary Examiner(s)Vo, Hai
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Assistant Examiner(s)ADKINS, CHINESSA T
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Application NumberUS13/545,311Publication NumberTime in Patent Office602 DaysField of SearchNoneUS Class Current428/520CPC Class CodesB32B 27/00 Layered products comprising...C09K 2323/057 Ester polymer, e.g. polycar...Y10T 428/12056 Entirely inorganicY10T 428/269 including synthetic resin o...Y10T 428/2848 Three or more layersY10T 428/31928 Ester, halide or nitrile of...Y10T 428/31935 Ester, halide or nitrile of...
