Water-soluble pressure sensitive adhesive
AssigneeAdhesive Research, Inc.
InventorMichael J. Zajaczkowski
Life of this patent
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Abstract
A water-soluble or water-dispersible normally tacky pressure sensitive adhesive is provided comprised of a copolymer of a water-soluble base monomer and a water-soluble macromer. In a preferred embodiment, the water-soluble base monomer comprises a carboxylic hydroxyalkyl ester monomer and the water-soluble macromer comprises an ethoxylated or propoxylated hydroxyalkyl (meth)acrylate.
Claims42
A water-soluble or water-dispersible normally tacky pressure sensitive adhesive comprised of copolymerized water-soluble base monomer A and hydrophilic macromer C, and optionally a B monomer copolymerizable with said A monomer and said C macromer, wherein said monomer A comprises a vinyl monomer capable of forming a hydrophilic polymer and having a T.sub.g <20.degree. C., said optional monomer B is capable of forming a hydrophilic or hydrophobic polymer, and said macromer C comprises a hydrophilic monomer represented by the formula:
- ##STR3## wherein R.sub.1 represents a hydrogen atom or a C.sub.1-5 alkyl group;
- R.sub.2 is H or C.sub.1-5 alkyl;
- and in which m is an integer of from 2 to 6 and n is an integer of from 5 to 300, with the provisos that when said C macromer is present in an amount of at least 45 percent by weight, then at least 5 percent by weight of a B monomer having a T.sub.g of >20.degree. C. is present, and when said C macromer is present in an amount of 35 percent by weight or less, then at least 5 percent by weight of a B monomer having a T.sub.g of <0.degree. C. is present, and wherein any B monomer present, if hydrophobic, is present in an amount up to 25 percent by weight, based on the total weight of the components A, B and C, said adhesive exhibiting a tackifier-free Polyken probe tack value of at least 300 gm/cm.sup.2 as determined by ASTM D2979, a peel adhesion value of at least 20 oz/in as determined by PSTC 1, and a shear holding value of greater than 5 minutes as determined at 500 grams according to PSTC 7.
A water-soluble or water-dispersible normally tacky tackifier-free pressure sensitive adhesive comprised of copolymerized water-soluble base monomer A and hydrophilic macromer C, and optionally a B monomer copolymerizable with said A monomer and said C macromer, wherein said monomer A comprises a vinyl monomer capable of forming a hydrophilic polymer and having a T.sub.g <20.degree. C., said optional monomer B is capable of forming a hydrophilic or hydrophobic polymer, and said macromer C comprises a hydrophilic monomer represented by the formula:
- ##STR4## wherein R.sub.1 represents a hydrogen atom or a C.sub.1-5 alkyl group;
- R.sub.2 is H or C.sub.1-5 alkyl;
- and in which m is an integer of from 2 to 6 and n is an integer of from 5 to 300, with the provisos that when said C macromer is present in an amount of at least 45 percent by weight, then at least 5 percent by weight of a B monomer having a T.sub.g of >20.degree. C. is present, and when said C macromer is present in an amount of 35 percent by weight or less, then at least 5 percent by weight of a B monomer having a T.sub.g of <0.degree. C. is present, and wherein any B monomer present, if hydrophobic, is present in an amount up to 25 percent by weight, based on the total weight of the components A, B and C, said adhesive exhibiting a tackifier-free Polyken probe tack value of at least 300 gm/cm.sup.2 as determined by ASTM D2979, a peel adhesion value of at least 20 oz/in as determined by PSTC 1, and a shear holding value of greater than 5 minutes as determined at 500 grams according to PSTC 7.
Dependencies are inferred from the claim text.