US 12,290,967 B2
Combination of mold and release film, release film, mold, and method for manufacturing molded article
Keisuke Sakai, Matsudo (JP); Nanae Tanaka, Matsudo (JP); Kenji Miyashita, Tokyo (JP); and Go Kobayashi, Tokyo (JP)
Assigned to KOBAYASHI & CO., LTD., Tokyo (JP)
Appl. No. 17/440,146
Filed by KOBAYASHI & CO., LTD., Tokyo (JP)
PCT Filed Sep. 24, 2019, PCT No. PCT/JP2019/037198
§ 371(c)(1), (2) Date Sep. 16, 2021,
PCT Pub. No. WO2020/188859, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-052290 (JP), filed on Mar. 20, 2019.
Prior Publication US 2022/0152882 A1, May 19, 2022
Int. Cl. B29C 33/68 (2006.01); B29C 33/42 (2006.01); B29C 43/18 (2006.01); B29C 43/50 (2006.01); B29C 45/02 (2006.01); B29C 45/14 (2006.01); B29C 45/40 (2006.01); B29K 27/18 (2006.01)
CPC B29C 33/68 (2013.01) [B29C 33/42 (2013.01); B29C 43/18 (2013.01); B29C 43/50 (2013.01); B29C 45/02 (2013.01); B29C 45/14754 (2013.01); B29C 45/40 (2013.01); B29K 2027/18 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A combination, comprising:
a mold used for curing a thermosetting resin, and
a release film placed between the thermosetting resin and the mold during curing, wherein:
the release film comprises:
a base layer formed of a thermoplastic resin, and
a surface layer formed of a particle-containing fluororesin and having a surface shape attributable to particles contained in the surface layer,
the fluororesin of the surface layer comprises an isocyanate curing agent and a tetrafluoroethylene resin,
said isocyanate curing agent is a combination of an isocyanurate-type polyisocyanate and an adduct-type polyisocyanate having a mass ratio of 10:6 to 10:10,
the surface layer is laminated to a face of the base layer,
the face is placed on a side of the thermosetting resin during the curing,
the particles are inorganic particles, and an average particle size of the particles determined by laser diffraction particle size analysis is 1 μm to 10 μm,
the mold has an irregularity formed on the face that is brought into contact with the release film during the curing, and
a surface roughness Ra of the face of the mold is 1 μm to 4 μm.