US 12,221,568 B2
Adhesive tape and method for producing same
Kiyoshirou Narimatsu, Hasuda (JP); Junji Shibayama, Hasuda (JP); Akihiko Bandou, Saitama (JP); Youhei Takanohashi, Ibaraki (JP); and Nobuto Kamiya, Hasuda (JP)
Assigned to SEKISUI CHEMICAL CO., LTD., Osaka (JP)
Appl. No. 17/424,371
Filed by SEKISUI CHEMICAL CO., LTD., Osaka (JP)
PCT Filed Jan. 21, 2020, PCT No. PCT/JP2020/001953
§ 371(c)(1), (2) Date Jul. 20, 2021,
PCT Pub. No. WO2020/153357, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 2019-008672 (JP), filed on Jan. 22, 2019.
Prior Publication US 2022/0112403 A1, Apr. 14, 2022
Int. Cl. C09J 7/29 (2018.01); C09J 7/38 (2018.01)
CPC C09J 7/29 (2018.01) [C09J 7/38 (2018.01); C09J 2301/122 (2020.08); C09J 2301/208 (2020.08); C09J 2301/412 (2020.08); C09J 2400/24 (2013.01); C09J 2400/283 (2013.01); C09J 2423/046 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A pressure-sensitive adhesive tape, comprising: a base material;
and a pressure-sensitive adhesive layer provided on the surface of the base material and comprising cells in the inside thereof,
the cells comprising first cells contacting with the surface of the base material and second cells disposed at positions away from the surface of the base material,
the first cells being cells derived from a liquid volatile component,
the second cells being cells derived from foamable particles, wherein the foamable particles comprise a hollow particle having a cell inside of an outer shell of the hollow particle,
a surface roughness (Rz) of the outer surface of the pressure-sensitive adhesive layer being 40 μm or smaller, and
the average cell diameter of the first cells being larger than the average cell diameter of the second cells,
wherein the base material comprises a paper base material and a resin layer provided on one surface of the paper base material, and the pressure-sensitive adhesive layer is provided on the other surface of the paper base material,
the paper base material is kraft paper and the resin layer is a polyethylene-based resin layer,
the pressure-sensitive adhesive layer further comprises a rubber component,
a content of the foamable particles in the pressure-sensitive adhesive layer is from 0.28 to 0.97 parts by mass with respect to 100 parts by mass of the rubber component, and
the pressure-sensitive adhesive layer has a peeling rate of 25% or lower.