Loading patent…
AssigneeNitto Electric Industrial Co., Ltd.
InventorsIchiro Ijichi, Shigetoshi Kai, Hikaru Teranishi, Akira Morioka, Kazuyoshi Seki
Estimating the term…
A pressure-sensitive adhesive composition comprising a liquid diene polymer containing in the molecule thereof an average of about 2.0 to about 2.5 functional groups capable of reacting with an isocyanate group, an isocyanate compound containing in the molecule thereof 2 or more isocyanate groups and a tackifier containing therein at least one polar group selected from the class consisting of --COOH, --OH, and --CH.sub.2 OH, wherein the isocyanate compound is present in such amount that the isocyanate group(s) of the isocyanate compound is/are present in an amount of about 0.75 to about 1.2 equivalents per equivalent of the functional groups of the liquid diene based polymer, and the tackifier is present in an amount of about 10 to about 70, preferably 30 to 60, parts by weight per 100 parts by weight of the total weight of the liquid diene polymer and the isocyanate compound. This pressure-sensitive adhesive composition is coated on a support and heated to produce a pressure-sensitive layer, whereby a pressure-sensitive adhesive tape, for example, can be obtained.
A pressure-sensitive adhesive composition for producing a pressure-sensitive adhesive, the pressure-sensitive adhesive composition consisting essentially of a homo- or co-polymer having a molecular weight of 1,000 to 50,000 of diene monomers or a copolymer of diene monomers and a vinyl monomer and containing in the molecule thereof an average of about 2.0 to about 2.5 functional groups capable of reacting with an isocyanate group, an isocyanate compound containing therein 2 or more isocyanate groups, and a tackifier miscible with the diene polymer and the isocyanate compound containing therein at least one polar group selected from the class consisting of --COOH, --OH, and --CH.sub.2 OH, wherein the isocyanate compound is present in such amount that the isocyanate group of said isocyanate compound is about 0.75 to about 1.2 equivalents per equivalent of the functional group of the liquid diene polymer, and the tackifier is present in an amount of about 10 to about 70 parts by weight per 100 parts by weight of the total weight of the liquid diene polymer and the isocyanate compound.
Dependencies are inferred from the claim text.