Wet and Dry Surface Adhesives

Abstract

A pressure sensitive adhesive comprising the polymerization product of a polymerizable composition comprising: (a) one or more (meth)acrylate ester monomers; (b) one or more hydrophilic non-acidic monomers; and (c) reactive, ionic surfactant. Also articles comprising such adhesives and methods for making such adhesives and such articles.

1 . A pressure sensitive adhesive comprising the polymerization product of a polymerizable composition comprising:
 (a) one or more (meth)acrylate ester monomers that when polymerized in the absence of other co-monomers yield a polymer or copolymer having a T g  of less than about 10° C.;   (b) one or more hydrophilic non-acidic monomers, wherein the one or more (meth)acrylate ester monomers and the one or more hydrophilic non-acidic monomers are present in a ratio of about 1:1 to about 1.8:, wherein the polymerizable composition comprises 30 to 70 to 70 to 90 parts by weight of a mixture of one or more (meth)acrylate ester monomers and one or more hydrophilic non-acidic monomers; and   (c) about 10 wt % to about 30 wt %, based on the total weight of polymerization product, of a reactive, ionic surfactant.   
     
     
         2 . The adhesive of  claim 1  wherein the one or more (meth)acrylate ester monomers are selected from the group consisting of n-butyl acrylate, decyl acrylate, 2-ethylhexyl acrylate, hexyl acrylate, isoamyl acrylate, isodecyl acrylate, isononyl acrylate, isooctyl acrylate, lauryl acrylate, 2-methyl butyl acrylate, 4-methyl-2-pentyl acrylate, ethoxy ethoxyethyl acrylate, 2-octyl acrylate, monomers comprising structural isomers of a secondary alkyl (meth)acrylate, and mixtures thereof. 
     
     
         3 . The adhesive of  claim 1  wherein the one or more hydrophilic non-acidic monomers are selected from the group consisting of N,N-dimethyl acrylamide, N,N-diethyl acrylamide, tert-octyl acrylamide, N,N-dimethyl methacrylamide, N,N-diethyl methacrylamide, n-octyl acrylamide, and mixtures thereof. 
     
     
         4 . The adhesive of  claim 1  wherein the polymerization composition further comprises one or more hydrophilic acidic comonomers. 
     
     
         5 . The adhesive of  claim 4  wherein the one or more hydrophilic acidic comonomers is selected from the group consisting of ethylenically unsaturated carboxylic acids, ethylenically unsaturated sulfonic acids, ethylenically unsaturated phosphonic acids, and mixtures thereof. 
     
     
         6 . The adhesive of  claim 1  wherein the reactive, ionic surfactant is selected from the group consisting of ammonium or sodium salts of sulfate and phosphoric acid. 
     
     
         7 . The adhesive of  claim 1  wherein the polymerization composition further comprises one or more initiators selected from the group consisting of photoinitiators and thermal initiators. 
     
     
         8 . The adhesive of  claim 7  wherein the one or more initiators is selected from the group consisting of benzoin ethers, substituted benzoin ethers, aromatic sulfonyl chlorides, and photoactive oxides. 
     
     
         9 . The adhesive of  claim 8  wherein the one or more initiators is selected from the group consisting of hydroperoxides and peroxides 
     
     
         10 . The adhesive of  claim 8  wherein the one or more initiators is in an amount of about 0.005 to about 1 wt % based on the weight of the copolymerizable monomers. 
     
     
         11 . The adhesive of  claim 1  wherein the polymerization composition further comprises one or more chain transfer agents selected from the group consisting of halogenated hydrocarbons, sulfur compounds, and mixtures thereof. 
     
     
         12 . The adhesive of  claim 11  wherein the polymerization composition comprises from about 0 part to about 10 parts by weight per 100 parts of total monomer. 
     
     
         13 . A hot melt pressure sensitive adhesive comprises a wet-stick pressure sensitive adhesive having a flow temperature and a thermoplastic packaging material enveloping said wet-stick pressure sensitive adhesive, said thermoplastic packaging material having a melting temperature lower than the flow temperature of the wet-stick pressure sensitive adhesive, wherein said pressure sensitive adhesive comprises the polymerization product of a polymerizable composition comprising:
 (a) one or more (meth)acrylate ester monomers that when polymerized in the absence of other co-monomers, yield a polymer or copolymer having a T g  of less than about 10° C.;   (b) one or more hydrophilic non-acidic monomers, wherein the one or more (meth)acrylate ester monomers and the one or more hydrophilic non-acidic monomers are present in a ratio of about 1:1 to about 1.8:1, and   (c) about 10 wt % to about 30 wt %, based on the total weight of polymerization product, of a reactive, ionic surfactant.   
     
     
         14 . An article a substrate; and a hot melt pressure sensitive adhesive applied to a surface of said substrate, said hot melt adhesive comprising a mixture of a pressure sensitive adhesive having a flow temperature and a thermoplastic material having a melting temperature that is less than the flow temperature of the pressure sensitive adhesive, said pressure sensitive adhesive comprising the polymerization product of a polymerizable composition comprising:
 (a) one or more (meth)acrylate ester monomers that when polymerized in the absence of other co-monomers yield a polymer or copolymer having a T g  of less than about 10° C.;   (b) one or more hydrophilic non-acidic monomers, wherein the one or more (meth)acrylate ester monomers and the one or more hydrophilic non-acidic monomers are present in a ratio of about 1:1 to about 1.8:1, and   (c) about 10 wt % to about 30 wt %, based on the total weight of polymerization product, of a reactive, ionic surfactant.   
     
     
         15 - 17 . (canceled) 
     
     
         18 . The adhesive of  claim 1  wherein the polymerizable composition comprises 25 to 40 wt. % of the one or more hydrophilic non-acidic monomers. 
     
     
         19 . The adhesive of  claim 1  wherein the pressure sensitive adhesive is solventless. 
     
     
         20 . The adhesive of  claim 1  wherein the adhesive is not an emulsion.