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AssigneeSanyo-Kokusaku Pulp Co., Ltd.
InventorsTomishi Shibano, Sachio Maruchi, Koji Yakan, Tadashi Kobayashi, Saburo Akimoto
Estimating the term…
Pressure sensitive adhesive products or articles having one or more release layers and a pressure sensitive adhesive layer, said one or more release layer comprising a polyolefinic elastomer having a shearing modulus of less than 2.0.times.10.sup.8 dyne/cm.sup.2 and surface wettability expressed in terms of an equilibrium contact angle of more than 55.degree. with respect to a standard liquid, and said adhesive layer being composed mainly of a polyacrylate. To increase the adhesion between the release layer and a backing substrate, a reinforcing interlayer may be used. As the release layer, a mixture of the polyolefinic elastomer and polyethylene may be used. The release layer is then kept in contact with the adhesive layer over a given area to form a composite or integral layer thereof as by extrusion coating.
Pressure sensitive adhesive products having one or more release layers and a pressure sensitive adhesive layer, in which a release layer comprises a polyolefinic elastomer having a shearing modulus of less than 2.0.times.10.sup.8 dyne/cm.sup.2 according to JIS K 7213 test, surface wettability expressed in terms of an equilibrium contact angle for more than 55.degree. with respect to a standard liquid having a surface tension of 50 dyne/cm and used in JIS K 6768 test under the conditions of 20.degree..+-.1.degree. C. and 65.+-.5% RH and a thickness of at least 1 micron, and a pressure sensitive adhesive layer contains as a main component a polyacrylate, said release layer being kept in contact with said adhesive layer over a given area to form a composite layer or integral thereof.
Pressure sensitive adhesive products having one or more release layer and a pressure sensitive adhesive layer, in which a release layer has a thickness of at least 1 micron and comprises a resin mixture of a polyolefinic elastomer having a shearing modulus of less than 2.0.times.10.sup.8 dyne/cm.sup.2 according to JIS K 7213 test, surface wettability expressed in terms of an equilibrium contact angle of more than 55.degree. with respect to a standard liquid having a surface tension of 50 dyne/cm and used in JIS K 6768 test under the conditions of 20.degree..+-.1.degree. C. and 65.+-.5% RH and a polyethylene added thereto, and a pressure sensitive adhesive layer contains a polyacrylate as a main component, said release layer being kept in contact with said adhesive layer over a given area to form a composite or integral layer thereof.
Dependencies are inferred from the claim text.