TACKIFIER RESIN EMULSION

PROBLEM TO BE SOLVED: To efficiently water-emulsify a tackifier resin having high softening point (for example, rosin resin or the like) without use of organic solvent. SOLUTION: A tackifier resin having a softening point of 120 to 190°C is emulsified in water without solvent in the presence of an acrylic oligomer having a weight-average molecular weight of 500 to 50,000 under application of a pressure thereby producing the tackifier emulsion of this invention. This emulsion is different from the conventional emulsion using an acrylic polymer of high molecular weight, several ten thousands, which has been widely used as base polymer, and contains the acrylic oligomer having specific low molecular weight, particularly, oligomer prepared by continuous block polymerization as an auxiliary component, therefore, it can be smoothly water-emulsified by the non-solvent phase inversion method using simple equipment, even in the case where the resin has high softening temperature, and can be smoothly water-emulsified as the production cost is suppressed lower. COPYRIGHT: (C)2006,JPO&NCIPI