Method for manufacturing impregnation-coating type Japanese paper masking tape base material
The present invention relates to a masking tape base material using a machine-made Japanese paper as a base paper. The machine-made Japanese paper comprises a mercerized softwood pulp and a kraft pulp. The weight percent of the mercerized softwood pulp in a mixture of the mercerized softwood pulp and the kraft pulp is from 10 to 70% by weight. The machine-made Japanese paper is impregnated with a resin having a glass transition temperature of not higher than −25° C. in an amount of 20% by weight or more. One surface of the impregnated machine-made Japanese paper is further coated with a resin having a glass transition temperature (Tg) of from 0 to 40° C. in a dry coating amount of from 2 to 20 g/m 2 .
1. A masking tape base material comprising:
a machine-made Japanese paper as a base paper, wherein
the machine-made Japanese paper has a basis weight of from 25 to 40 g/m 2 and consists of a mercerized softwood pulp and a kraft pulp, a weight percent of the mercerized softwood pulp in a mixture of the mercerized softwood pulp and the kraft pulp being from 10 to 70% by weight,
the machine-made Japanese paper is impregnated with a resin having a glass transition temperature of not higher than −25° C. in an amount of 20% by weight or more relative to a weight of the machine-made Japanese paper, and
one surface of the impregnated machine-made Japanese paper is coated with another resin having a glass transition temperature (Tg) of from 0 to 40° C. in a dry coating amount of from 2 to 20 g/m 2 .
2. The masking tape base material according to claim 1 ,
wherein the weight percent of the mercerized softwood pulp is from 20 to 50% by weight.