US 12,006,420 B2
Polyimide powder composition
Atsushi Sakai, Kanagawa (JP); and Yuuki Sato, Kanagawa (JP)
Assigned to MITSUBISHI GAS CHEMICAL COMPANY, INC., Chiyoda-ku (JP)
Appl. No. 17/049,484
Filed by MITSUBISHI GAS CHEMICAL COMPANY, INC., Chiyoda-ku (JP)
PCT Filed May 8, 2019, PCT No. PCT/JP2019/018367
§ 371(c)(1), (2) Date Oct. 21, 2020,
PCT Pub. No. WO2019/220967, PCT Pub. Date Nov. 21, 2019.
Claims priority of application No. 2018-095746 (JP), filed on May 17, 2018.
Prior Publication US 2021/0261756 A1, Aug. 26, 2021
Int. Cl. C08K 9/06 (2006.01); B33Y 70/10 (2020.01); C08K 3/36 (2006.01)
CPC C08K 9/06 (2013.01) [B33Y 70/10 (2020.01); C08K 3/36 (2013.01); C08K 2201/005 (2013.01); C08K 2201/011 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A polyimide powder composition comprising a thermoplastic polyimide resin powder (A) and silica, particles (B), wherein the silica particles have a volume average particle size D50 of 90 nm or less,
wherein a polyimide resin constituting the thermoplastic polyimide resin powder (A) comprises a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of the formula (1) with respect to the total of the repeating structural unit of the formula (1) and the repeating structural unit of the formula (2) is from 20 mol % to less than 40 mol %:

OG Complex Work Unit Chemistry
wherein R1 represents a divalent group having from 6 to 22 carbon atoms comprising at least one alicyclic hydrocarbon structure; R2, represents a divalent chain aliphatic group having from 5 to 16 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms comprising at least one aromatic ring,
wherein the silica particles (B) are at least one selected from the group consisting of phenylsilane-treated silica particles and (meth)acrylsilane-treated silica particles,
wherein a content of the silica particles (B) is from 0.05 to 10 parts by mass with respect to 100 parts by mass of the thermoplastic polyimide resin powder (A),
wherein a total content of the thermoplastic polyimide resin powder (A) and the silica particles (B) is at least 90 mass %, and
wherein the polyimide powder composition has an angle of repose of 30° or less as measured with a multi-functional apparatus for measuring powder physical properties.