Removable adhesive sheet
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United States of America Patent
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-
Sep 23, 1997
Grant Date -
N/A
app pub date -
Dec 15, 1995
filing date -
Dec 15, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a removable adhesive sheet comprising a release liner, an adhesive layer and a surface stock as laminated, wherein the adhesive layer being formed by applying an adhesive to the release liner or to the surface stock, followed by drying, said adhesive comprising (i) an aqueous emulsion of a copolymer obtained by emulsion polymerization and (ii) a polyglycidyl compound having two or more epoxy groups within the molecule thereof, said copolymer comprising (a) 80-99% by weight of a (meth)acrylic acid C.sub.8 -C.sub.12 alkyl ester, (b) 0.3-10% by weight of (meth)acrylonitrile, (c) 0.1-5% by weight of an .alpha.,.beta.-unsaturated carboxylic acid and (d) 0-5% by weight of another copolymerizable monomer, said copolymer having a Mn of not less than 0.1.times.10.sup.4 but less than 5.0.times.10.sup.4, ratio of (Mw/Mn) of 40-800, an average particle size of 100-500 nm and a Tg of not higher than -50.degree. C., and said polyglycidyl compound being used in an amount such that the epoxy groups amount to 0.5 to 2 equivalents relative to the carboxyl groups in said copolymer.
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