Primer composition and adhesive tape
AssigneeDenka Company Limited
InventorsKohji KUBO, Mizuki HASUMI
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Abstract
An object of the present invention is to provide a primer composition for application between the base film and the adhesive layer of an adhesive tape that can improve the adhesion between the base film and the adhesive layer of the adhesive tape and an adhesive tape prepared by using the primer composition. A primer composition, comprising 100 parts by mass (as solid matter) of a graft polymer of a natural rubber graft-polymerized with 15 to 65 mass % of methyl methacrylate and 25 to 300 parts by mass of a carboxyl group-modified acrylonitrile butadiene rubber.
Claims4
An adhesive tape, prepared by applying a primer composition between a base film mainly made of a polyvinyl chloride having 30 to 60 parts by mass of a softening agent and an adhesive layer laminated on at least one face of the base film;
- and
- wherein the primer composition, comprising 100 parts by mass (as solid matter) of a graft polymer of a natural rubber graft-polymerized with 30 to 50 mass % of methyl methacrylate and 25 to 300 parts by mass of a carboxyl group-modified acrylonitrile butadiene rubber;
- and
- the carboxyl group-modified acrylonitrile butadiene rubber has a carboxyl group-modification rate of 0.3 to 7 mass %,
- and a solid matter concentration of the primer composition after dilution with solvent is 1 to 20 mass %, and a solution viscosity of the solution of the primer composition diluted with a solvent is 1 to 500 MPa·s, and
- the primer composition contains a graft polymer having a Mooney viscosity (MS.sub.1+4, at 100.degree. C.) of 70 to 160 or contains additionally 0.1 to 10 parts by mass (as solid matter) of a surfactant with respect to 100 parts by mass (as solid matter) of the graft polymer, and
- wherein the adhesive layer, being mainly made of a natural rubber and a graft polymer.
Dependencies are inferred from the claim text.