Adhesive tape and method of manufacturing thereof

An adhesive tape comprising:

• a base material;
• and
• an adhesive sheet provided on one surface of the base material and comprising cured products of an aqueous acrylic adhesive composition, wherein the adhesive tape is formed by the base material and the adhesive sheet undergoing a winding and unwinding process,
• wherein the adhesive sheet has a porous structure comprising pores, and
• wherein the adhesive tape has a water vapor transmission rate of 3,000 g/m2·day or more and 5,000 g/m2·day or less under conditions of a temperature of 40° C. and a relative humidity of 20%,
• wherein the aqueous acrylic adhesive composition comprises an acrylic resin, a thermal foaming agent, a curing agent and a surfactant, wherein the thermal foaming agent includes one or more selected from the group consisting of azo dicarbon amide, p,p′-oxybis (benzenesulfonyl hydrazide), p-toluenesulfonyl hydrazide, and sodium bicarbonate, wherein the surfactant includes one or more of a cationic surfactant, a zwitterionic surfactant, or a non-ionic surfactant,
• wherein the adhesive sheet is formed by carrying out foaming and thermal curing the aqueous acrylic adhesive composition sequentially at a first temperature (T1) of 0° C. or more and 30° C. or less, a second temperature (T2) of 150° C. or more and 200° C. or less, a third temperature (T3) of 90° C. or more and 120° C. or less, and a fourth temperature (T4) of 40° C. or more and 80° C. or less.

An adhesive tape comprising:

• a base material;
• and
• an adhesive sheet provided on one surface of the base material and comprising cured products of an aqueous acrylic adhesive composition,
• wherein the adhesive sheet has a porous structure comprising pores, and
• wherein the adhesive tape has a water vapor transmission rate of 3,000 g/m2·day or more and 5,000 g/m2·day or less under conditions of a temperature of 40° C. and a relative humidity of 20%,
• wherein the aqueous acrylic adhesive composition comprises an acrylic resin, a thermal foaming agent, a curing agent and a surfactant, wherein the thermal foaming agent includes one or more selected from the group consisting of azo dicarbon amide, p,p′-oxybis (benzenesulfonyl hydrazide), p-toluenesulfonyl hydrazide, and sodium bicarbonate, wherein the surfactant includes one or more of a cationic surfactant, a zwitterionic surfactant, or a non-ionic surfactant, wherein a content of the thermal foaming agent is 0.2 parts by weight or more and 1 part by weight or less based on 100 parts by weight of acrylic resin, wherein the acrylic resin is a polymer of a (meth)acrylic acid ester-based monomer and a polar functional group-containing monomer, wherein a content of the polar functional group-containing monomer is 0.7 part by weight or more and 2 parts by weight or less based on 100 parts by weight of the (meth)acrylic acid ester-based monomer, wherein the aqueous acrylic adhesive composition has a density of 0.4 g/cm3 or more and 0.8 or less g/cm3,
• wherein the adhesive sheet is formed by carrying out foaming and thermal curing the aqueous acrylic adhesive composition sequentially at a first temperature (T1) of 0° C. or more and 30° C. or less, a second temperature (T2) of 150° C. or more and 200° C. or less, a third temperature (T3) of 90° C. or more and 120° C. or less, and a fourth temperature (T4) of 40° C. or more and 80° C. or less.