US 11,919,205 B2
Mold-release film
Keisuke Sakai, Matsudo (JP); and Nanae Tanaka, Matsudo (JP)
Assigned to KOBAYASHI & CO., LTD., Tokyo (JP)
Appl. No. 17/792,114
Filed by KOBAYASHI & CO.,LTD., Tokyo (JP)
PCT Filed Jun. 29, 2020, PCT No. PCT/JP2020/025434
§ 371(c)(1), (2) Date Jul. 11, 2022,
PCT Pub. No. WO2021/220523, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 2020-078007 (JP), filed on Apr. 27, 2020.
Prior Publication US 2023/0054528 A1, Feb. 23, 2023
Int. Cl. B29C 33/68 (2006.01); B29C 37/00 (2006.01); B32B 27/08 (2006.01); B32B 27/26 (2006.01); B32B 27/32 (2006.01)
CPC B29C 33/68 (2013.01) [B29C 37/0075 (2013.01); B32B 27/08 (2013.01); B32B 27/26 (2013.01); B32B 27/322 (2013.01); B32B 2264/0221 (2013.01); B32B 2307/5825 (2013.01); B32B 2307/748 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A release film having a base layer formed of a thermoplastic resin and a surface layer formed of a resin composition laminated on at least one surface of the base layer, wherein the trouser tear strength in accordance with JIS K7128-1 is 5 N/mm or more, the peeling force of the resin composition is 15 mN/30 mm or less when measured at 175° C. according to JIS Z0237, and the breaking point elongation of the resin composition is 70% or more when measured at 175° C. according to JIS K7127;
wherein the resin composition contains isocyanurate type polyisocyanate and adduct-type polyisocyanate and a tetrafluoroethylene resin,
wherein an amount of the isocyanurate-type polyisocyanate is 8.6 parts by mass to 12.9 parts by mass with respect to 100 parts by mass of the tetrafluoroethylene resin, and
wherein an amount of the adduct-type polyisocyanate is 2.6 parts by mass to 10.4 parts by mass with respect to 100 parts by mass of the tetrafluoroethylene resin.