| abstract |
An adhesive composition comprising a mixture of: (I) a hydrophilic pressure sensitive adhesive, in which the hydrophilic pressure sensitive adhesive comprises (i) a polymerization product of: (a) from 15 to 85 parts by weight of an ester monomer of (meth) acrylate, in which the (meth) acrylate ester monomer, when polymerized, has a glass transition temperature (Tg) of less than 10 ° C; and (b) 85 to 15 parts by weight of a hydrophilic acid comonomer; and (c) at least 10 parts based on 100 parts of the sum of the components (a) + (b) of a non-reactive plasticizing agent, wherein the non-reactive plasticizing agent is polyethylene oxide; polypropylene oxide; polyethylene glycol; a copolymer of ethylene oxide, propylene oxide or polyethylene glycol; an alkyl or aryl functionalized polyalkylene oxide; a phenyl ether of polyethylene oxide; a polyether functionalized with benzoyl; a polypropylene glycol dibenzoate; a monomethyl ether of polyethylene oxide; a methoxypolyethylene glycol having a molecular weight of about 550; a polypropylene glycol having a molecular weight of about 1025 or about 425; a block copolymer of ethylene oxide / propylene oxide; or their mixtures; and (II) a hydrophobic pressure sensitive adhesive. |