AQUEOUS EMULSION, METHOD FOR PRODUCING AQUEOUS EMULSION, AQUEOUS ADHESIVE COMPOSITION, AND ADHESIVE SHEET

摘要

This aqueous emulsion is obtained using a production method that includes the following steps and that satisfies the following conditions: (I) A step in which a first polymerizable component is emulsion polymerized in the presence of an addition fragmentation chain transfer agent; a step (II) in which the polymer obtained in step (I) is supplied with a second polymerizable component and polymerized. The amount of the addition fragmentation chain transfer agent is 0.05 to 1 parts by mass per 100 parts by mass of the totality of polymerizable contents obtained by adding the first polymerizable component and the second polymerizable component. The first polymerizable component gives a polymer having a glass transition temperature not exceeding -20°C, and accounts for 70-95% by mass of the totality of polymerizable components. The second polymerizable component gives a polymer having a glass transition temperature of at least 50°C, and accounts for 5-30% by mass of the totality of polymerizable components.