Aqueous emulsion based pressure sensitive adhesive and pressure sensitive adhesive sheet employing same
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United States of America Patent
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app pub date -
Dec 19, 2005
filing date -
May 13, 2002
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Abandoned
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Abstract
An aqueous emulsion based pressure sensitive adhesive is disclosed that includes water and a water dispersible polymer, and has (1) a viscosity of 100 to 1000 mPas, (2) a dynamic surface tension of a water diluted 75% solution thereof of 59 mN/m or more at a discharge frequency of 25 Hz and a temperature of 25.degree. C., and (3) a nonvolatile content of 50 to 70 wt %. This pressure sensitive adhesive is an emulsion composition having low viscosity and ease of handling and causing no coating defects such as `cissing` and `retraction` when coated on a release paper. Furthermore, there is disclosed a process for producing a pressure sensitive adhesive sheet that includes a release material, a pressure sensitive adhesive layer, and a substrate, the pressure sensitive adhesive layer being formed from the above aqueous emulsion based pressure sensitive adhesive.
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