Aqueous emulsion, method for producing aqueous emulsion, aqueous pressure-sensitive adhesive composition, and pressure-sensitive adhesive sheet

摘要

Step (I) of emulsion polymerization of the first polymerizable component in the presence of an addition-cleavage type chain transfer agent, and a step of supplying the second polymerizable component to the polymer obtained in the step (I) for polymerization. (II) and an aqueous emulsion obtained by the manufacturing method which satisfy | fills the following conditions. The amount of the addition cleavage type chain transfer agent is 0.05 to 1 part by mass with respect to 100 parts by mass of the total polymerizable component obtained by adding the first polymerizable component and the second polymerizable component. A 1st polymeric component gives the polymer whose glass transition temperature is -20 degrees C or less, and is 70-95 mass% in all the polymeric components. A 2nd polymeric component gives the polymer whose glass transition temperature is 50 degreeC or more, and is 5-30 mass% in all the polymeric components.