US 11,927,779 B2
Method for manufacturing retroreflective sheet and retroreflective sheet
Chenyang Jiang, Toyama (JP); and Toshiaki Shiomi, Toyama (JP)
Assigned to NIPPON CARBIDE INDUSTRIES CO., INC., Tokyo (JP)
Appl. No. 16/978,222
Filed by NIPPON CARBIDE INDUSTRIES CO., INC., Tokyo (JP)
PCT Filed Mar. 26, 2019, PCT No. PCT/JP2019/012815
§ 371(c)(1), (2) Date Sep. 4, 2020,
PCT Pub. No. WO2019/189154, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-060515 (JP), filed on Mar. 27, 2018.
Prior Publication US 2021/0003751 A1, Jan. 7, 2021
Int. Cl. G02B 5/122 (2006.01); B32B 27/08 (2006.01); G02B 5/124 (2006.01)
CPC G02B 5/124 (2013.01) [B32B 27/08 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for manufacturing a retroreflective sheet, provided with a retroreflective layer having a plurality of retroreflective elements on one surface, a back face layer provided to face a plurality of the retroreflective elements, and a coupling portion configured (i) to couple a part of a plurality of the retroreflective elements and a part of a one side surface of the back face layer and (ii) not to couple the other part of a plurality of the retroreflective elements and the other part of the one side surface of the back face layer, the method comprising:
a preparation step of preparing a resin composition that has a viscosity capable of adhering over a predetermined time after application of predetermined energy, and completes curing after the predetermined time passes;
a coating step of applying the resin composition forming the coupling portion on the retroreflective layer or the back face layer;
an energy application step of applying the predetermined energy to the resin composition; and
a bonding step of bonding the retroreflective layer and the back face layer via the resin composition to which the predetermined energy is applied before the predetermined time passes.