TACKIFYING RESIN EMULSION AND AQUEOUS PRESSURE-SENSITIVE ADHESIVE COMPOSITION

摘要

PROBLEM TO BE SOLVED: To obtain a tackifying resin emulsion with a high heat resistance and good adhesive properties by emulsifying, in the presence of an emulsifier, a compound formed by converting the carboxyl groups of a rosin and/or a rosin derivative having an acid value into metal salt groups with a metal compound, SOLUTION: A tackifying resin is prepared by adding 0.1-5 pts.wt. mono-to trivalent metal compound (e.g. calcium hydroxide) to 100 pts.wt. rosin and/or rosin derivative (e.g. an ester compound) having an acid value to convert the carboxyl groups of the rosin or rosin derivative into metal salt groups. The objective tackifying resin emulsion is prepared by adding 1-10 pts.wt. (solid basis) anionic or nonionic surfactant to 100 pts.wt. tackifying resin prepared as above. An aqueous resin composition is prepared by compounding 100 pts.wt. (solid basis; the same applies hereunder) acrylic polymer emulsion with 2-40 pts.wt. tackifying resin emulsion or by compounding 100 pts.wt. rubber latex with 10-150 pts.wt. tackifying resin emulsion.