US2011177329A1PendingUtilityA1

Adhesive blends, articles, and methods

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Assignee: XIA JIANHUIPriority: Apr 11, 2003Filed: Apr 4, 2011Published: Jul 21, 2011
Est. expiryApr 11, 2023(expired)· nominal 20-yr term from priority
Inventors:Jianhui XiaYing-Yuh LuZhiming Zhou
C09J 133/00C08L 2666/04C09J 133/06B32B 7/12B32B 27/08C09J 201/02C09J 7/35C09J 7/10C09J 2433/00Y10T428/31507Y10T428/31938Y10T428/31909Y10T428/2804B32B 27/308B32B 2307/7246B32B 2551/00Y10T428/31855Y10T428/2891Y10T428/2848B32B 27/365C09J 7/00C09J 9/00
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Claims

Abstract

Described are adhesive compositions containing a mixture of a pressure sensitive adhesive, a high Tg polymer, and a crosslinker to form a compatibilized blend that is optically clear. Methods of using the adhesive compositions, and multilayer assemblies such as optical elements prepared using the adhesives, are also provided.

Claims

exact text as granted — not AI-modified
1 . An adhesive composition comprising a blend of:
 a majority of a pressure sensitive adhesive component comprising at least one polymer with an acid or base functionality,   a high Tg polymer with an weight average molecular weight greater than 100,000 comprising an acid or base functionality, and   a crosslinker;   wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed.   
     
     
         2 . The adhesive composition of  claim 1  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the composition is optically clear on visual observation. 
     
     
         3 . The adhesive composition of  claim 1  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the composition has a luminous transmission greater than 90%, and a haze less than 2%. 
     
     
         4 . The adhesive of  claim 1  wherein the high Tg polymer has a glass transition temperature greater than 20° C. 
     
     
         5 . The adhesive of  claim 4  wherein the high Tg polymer has a glass transition temperature greater than 50° C. 
     
     
         6 . The adhesive of  claim 1  wherein the high Tg polymer comprises a monomer selected from the group consisting of vinyl esters, (meth)acrylamide, styrenes, (meth) acrylontriles, substituted styrenes, vinyl halides, vinyl propionate, (meth)acrylates, and mixtures thereof. 
     
     
         7 . The adhesive of  claim 1  wherein the high Tg polymer is a basic copolymer. 
     
     
         8 . The adhesive of  claim 1  wherein the pressure sensitive adhesive comprises a copolymer with an weight average molecular weight less than 800,000. 
     
     
         9 . The adhesive of  claim 1  wherein the pressure sensitive adhesive is formed from free-radically polymerizable monomers selected from the group of (meth)acrylates, vinyl monomers, and mixtures thereof. 
     
     
         10 . The adhesive of  claim 1  comprising a crosslinker selected from the group consisting of multifunctional aziridine, peroxides, benzophenones, triazines, monoethylenically unsaturated mono-, di-, and trialkoxy silane compounds, diacrylates, triacrylates, and tetraacrylates, isocyanates, epoxies, and mixtures thereof. 
     
     
         11 . The adhesive of  claim 1  wherein the acid-base interaction increases the miscibility of the mixture such that the domain size of the high Tg polymer is reduced to less than the wavelength of light. 
     
     
         12 . The adhesive of  claim 11  wherein the domain size of the high Tg polymer is less than 100 nm. 
     
     
         13 . The adhesive of  claim 12  wherein the domain size of the high Tg polymer is less than 50 nm. 
     
     
         14 . The adhesive of  claim 1  further comprising an additive. 
     
     
         15 . The composition of  claim 1  wherein the pressure sensitive adhesive component comprises from 70 to 90 percent based on the weight of the total composition. 
     
     
         16 . The composition of  claim 1  wherein the high Tg polymer comprises from 10 to 30 percent based on the total weight of the composition. 
     
     
         17 . The composition of  claim 1  wherein the adhesive composition is a pressure sensitive adhesive. 
     
     
         18 . An article comprising the composition of  claim 1  coated on at least one surface of a substrate. 
     
     
         19 . The article of  claim 18  wherein the substrate is selected from the group consisting of a release liner, a film, and a rigid material. 
     
     
         20 . A multi-layer assembly coated with an adhesive comprising an a mixture of:
 a majority of a pressure sensitive adhesive component comprising at least one polymer with an acid or base functionality,   a high Tg polymer with an weight average molecular weight greater than 100,000 comprising an acid or base functionality, and   a crosslinker;   wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed;   wherein the adhesive composition is optically clear, and wherein the adhesive bonds at least two layers together.   
     
     
         21 . The multilayer assembly of  claim 20  wherein the layers are selected from the group consisting of release liner, a film, and a rigid material. 
     
     
         22 . The multilayer assembly of  claim 20  wherein the adhesive composition bonds a low moisture vapor transfer layer to an outgassing layer. 
     
     
         23 . The assembly of  claim 22  wherein the outgassing layer comprises a material selected from the group consisting of a polycarbonate and a poly(methyl methacrylate). 
     
     
         24 . The assembly of  claim 22  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the bond between the outgassing layer and the low moisture vapor transfer layer does not delaminate or bubble, and the optical product remains optically clear. 
     
     
         25 . The assembly of  claim 22  wherein the low moisture vapor transfer layer is selected from the group consisting of a metallized polymeric film, an infrared reflecting film and a multilayer optical film. 
     
     
         26 . The assembly of  claim 20  wherein the assembly comprises a conductive optical element comprising a rigid polycarbonate layer adhered with the adhesive to a surface of a polymeric film layer, an opposite surface of the polymeric film layer being coated with a conductive layer. 
     
     
         27 . A method of preparing a multi-layer article, the method comprising
 coating onto a substrate an adhesive composition comprising a mixture of:
 a majority of a pressure sensitive adhesive component comprising at least one polymer comprising an acid or base functionality, 
 a high Tg polymer with an weight average molecular weight greater than 100,000 comprising an acid or base functionality, and 
 a crosslinker; 
   wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed.   
     
     
         28 . The method of  claim 27  further comprising the step of laminating the adhesive coated substrate on a second substrate. 
     
     
         29 . The method of  claim 27 , wherein the adhesive composition is in a solvent before coating on the substrate. 
     
     
         30 . The method of  claim 29 , further comprising the step of drying the adhesive composition to remove the solvent. 
     
     
         31 . The method of  claim 27 , wherein the adhesive composition is crosslinked after coating the adhesive composition on the substrate. 
     
     
         32 . An adhesive composition comprising a blend of:
 a majority of a pressure sensitive adhesive component comprising at least one polymer with an acid functionality,   a high Tg polymer comprising a base functionality imparted by an amide group, and   a crosslinker;   wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed; and   wherein the pressure sensitive adhesive component is free of alkoxy (meth)acrylates.   
     
     
         33 . The adhesive composition of  claim 32  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the composition is optically clear on visual observation. 
     
     
         34 . The adhesive composition of  claim 32  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the composition has a luminous transmission greater than 90%, and a haze less than 2%. 
     
     
         35 . The adhesive of  claim 32  wherein the pressure sensitive adhesive component comprises a copolymer with an weight average molecular weight less than 600,000. 
     
     
         36 . The adhesive of  claim 32  wherein a high Tg polymer with an weight average molecular weight greater than 50,000. 
     
     
         37 . An adhesive composition comprising a blend of:
 a majority of a pressure sensitive adhesive component comprising at least one polymer with a base functionality,   a high Tg polymer comprising an acid functionality, and   a crosslinker;   wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed.   
     
     
         38 . The adhesive composition of  claim 1  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the composition is optically clear on visual observation. 
     
     
         39 . The adhesive composition of  claim 1  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the composition has a luminous transmission greater than 90%, and a haze less than 2%.

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