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Abstract

An aqueous, plasticizer-retardant pressure sensitive adhesive (PSA) is made from an aqueous latex emulsion having an average particle size diameter of not substantially above about 100 nm and made from a mixture of ethylenically-unsaturated monomers and oligomers that include one or more of N-(iso-butoxymethyl) acrylamide, N-(n-butoxymethyl) acrylamide, N-methylol acrylamide; and emulsified in the presence of an emulsifier consisting essentially of: ##STR1## In structure I, R.sub.1 is an alkyl, alkenyl, or aralkyl group containing between 6 and 18 carbon atoms, R.sub.2 is H or R.sub.1, R.sub.3 is H or a propenyl group; A is an alkylene group of 2 to 4 carbon atoms, n is an integer ranging from 1 to 200, X is H or SO.sub.3 M, where M is an alkali metal, an ammonium ion, or an alkanolamine cation. Preferably, the ethylenically-unsaturated monomers include 2-ethylhexyl acrylate. Preferably, the emulsifier is: ##STR2## The preferred aqueous latex emulsion is prepared from a monomer mixture consisting essentially of at least one alkylacrylate having at least 4 carbon atoms in the alkyl chain, at least one ethylenically unsaturated carboxylic acid or its corresponding anhydride, at least one styrenic monomer, and N-(iso-butoxymethyl) acrylamide, and has a mean particle size diameter of less than or equal to about 100 nm.

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