# US 12,006,420 B2 · Polyimide powder composition

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- Number: US 12,006,420 B2
- Document ID: US12006420B2
- Status: Granted
- Kind: B2
- Application number: 17/049,484
- Filed: 2019-05-08
- Published: 2021-08-26
- Granted: 2024-06-11
- Earliest claimed: 2018-05-17
- Assignees: Mitsubishi Gas Chemical Company, Inc.
- Applicants: Mitsubishi Gas Chemical Company, Inc.
- Inventors: Atsushi Sakai; Yuuki Sato
- Web page: https://patentgrep.com/patent/US12006420B2

## CPC

- C08G 73/1017: {in the form of (mono)amine}
- C08K 9/06: with silicon-containing compounds
- B29C 64/153: using layers of powder being selectively joined, e.g. by selective laser sintering or melting
- B29C 64/314: Preparation
- B33Y 70/10: Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
- B33Y 80/00: Products made by additive manufacturing
- C08G 73/1042: {Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds}
- C08G 73/105: {with oxygen only in the diamino moiety}
- C08G 73/1082: {wholly aromatic in the tetracarboxylic moiety}
- C08K 3/36: Silica
- C08L 79/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08K 2201/005: Additives being defined by their particle size in general
- C08K 2201/011: Nanostructured additives
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided is a polyimide powder composition containing a thermoplastic polyimide resin powder (A) and silica particles (B) having a volume average particle size D50 of 90 nm or less.

## Claims

### Claim 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 %:
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.

### Claim 2 (depends on 1)

The polyimide powder composition according to claim 1, wherein a volume average particle size D50 of the thermoplastic polyimide resin powder (A) is from 5 to 200 μm.

### Claim 3 (depends on 1)

The polyimide powder composition according to claim 1, wherein a weight average molecular weight of the polyimide resin is from 10,000 to 150,000.

### Claim 4 (depends on 1)

The polyimide powder composition according to claim 1, which is a molding material for a 3D printer.

### Claim 5 (depends on 1)

The polyimide powder composition according to claim 1, which is a matrix resin material for a fiber-reinforced composite.

### Claim 6 (depends on 1)

A molded article obtained by molding the polyimide Powder composition according to claim 1.

### Claim 7 (depends on 1)

The polyimide powder composition according to claim 1, wherein the volume average particle size D50 of the silica particles (B) is from 5 nm to 60 nm.

### Claim 8 (depends on 1)

The polyimide powder composition according to claim 1, wherein the silica particles (B) comprise phenylsilane-treated silica particles.

### Claim 9 (depends on 1)

The polyimide powder composition according to claim 1, wherein the content of the silica particles (B) in the polyimide powder composition is from 0.2 to 3.0 parts by mass.