Process for preparing solvent-type acrylic pressure-sensitive adhesives and medical pressure-sensitive adhesive
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United States of America Patent
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Mar 23, 1999
Grant Date -
N/A
app pub date -
Sep 15, 1997
filing date -
Mar 31, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The object is directed toward obtaining a process for preparing a solvent-type acrylic pressure-sensitive adhesive which is able to increase a conversion at polymerization in the preparation of the solvent-type acrylic pressure-sensitive adhesive to thereby solve the problems of odors associated with residual monomers and of attachment of gels on reactor walls, and further to provide improved productivity and workability. In the preparation of the solvent-type acrylic pressure-sensitive adhesives, a monomer composition containing alkyl (meth)acrylate ester as its main component is subjected to solution polymerization under a closed condition at least in a latter stage of the polymerization reaction. In the polymerization, the solution to be polymerized is maintained at temperatures not lower than a boiling point thereof under normal pressures or at 50.degree.-120.degree. C.
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