US 12,187,932 B2
Adhesive film having three-dimensional molded shape
Haruyuki Mikami, Gotemba (JP)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/620,200
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jun. 23, 2020, PCT No. PCT/IB2020/055929
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2020/261120, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-121007 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0251427 A1, Aug. 11, 2022
Int. Cl. C09J 7/40 (2018.01); C09J 7/29 (2018.01)
CPC C09J 7/403 (2018.01) [C09J 7/29 (2018.01); C09J 2203/37 (2020.08); C09J 2301/206 (2020.08); C09J 2301/208 (2020.08)] 17 Claims
OG exemplary drawing
 
1. An adhesive film having a three-dimensional molded shape, the adhesive film comprising:
a base layer;
an adhesive layer including a fine structure in a surface; and
a liner layer covering the adhesive layer, wherein
the structure of the adhesive layer includes a plurality of convex parts,
each of the plurality of convex parts includes two or more parts joined to each other via an interface,
a first part present in a top of the convex part includes a non-adhesive or weak adhesive material, wherein the weak adhesive material is an adhesive having a storage modulus of elasticity of 3×105 Pa or greater as measured at a frequency of 1 Hz, and
a second part present below the first part includes a strong adhesive material, wherein the strong adhesive material is an adhesive having a storage modulus of elasticity of less than 3×105 Pa,
wherein the adhesive film includes portions differing in degree of stretching.