| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a removable aqueous dispersion-type adhesive and an adhesive sheet exerting a low increase with time in adhesion to adherends, such as metal plates and enabling easy removal without leaving any glue, without increasing the types of adhesive. <P>SOLUTION: The removable aqueous dispersion-type adhesive and an adhesive sheet are obtained by aqueous emulsion polymerization of a monomer mixture comprising at least (meth)acrylic acid esters and a vinyl monomer containing a functional group polymerizable with the esters, wherein an aqueous dispersion (A) having a weight-average molecular weight ranging from 5×10<SP>4</SP>to less than 5×10<SP>5</SP>, an aqueous dispersion (B) also having a weight-average molecular weight of 5×10<SP>5</SP>or more, an aqueous dispersion (C) having a gel content of 95% or less of the whole, and a sol content having a weight-average molecular weight of 5×10<SP>5</SP>or more, the average particle sizes of them are each within a range of 0.01 to 1μm, the aqueous dispersion (A) has an average particle size equivalent to or less than that of the aqueous dispersion (B) or (C), and 10-90 wt.% (A) and 10-90 wt.% (B) or 10-90 wt.% (A) and 10-90 wt.% (C) are arbitrarily mixed in terms of solid content so as to enable adjustment to a specific storage modulus. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
