# US 11,441,003 B2 · Three-dimensional object precursor treatment composition

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- Number: US 11,441,003 B2
- Document ID: US11441003B2
- Status: Granted
- Kind: B2
- Application number: 16/302,291
- Filed: 2016-05-17
- Published: 2019-06-20
- Granted: 2022-09-13
- Earliest claimed: 2016-05-17
- Assignees: Kao Corporation
- Applicants: Kao Corporation
- Inventors: Ryouichi Hashimoto; Eiji Kashihara
- Web page: https://patentgrep.com/patent/US11441003B2

## CPC

- C08J 7/12: Chemical modification
- B29C 64/118: using filamentary material being melted, e.g. fused deposition modelling [FDM]
- B29C 64/30: Auxiliary operations or equipment
- B29C 64/40: Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
- B29C 67/00: Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B33Y 10/00: Processes of additive manufacturing
- B33Y 40/00: Auxiliary operations or equipment, e.g. for material handling
- B33Y 40/20: Post-treatment, e.g. curing, coating or polishing
- B33Y 70/00: Materials specially adapted for additive manufacturing
- C08J 2333/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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

## Abstract

The present invention is a composition of an agent for treating a precursor of a three-dimensional object for removing a support material from the precursor of the three-dimensional object containing a three-dimensional object and the support material containing a (meth)acrylic acid-based copolymer having a hydrophilic monomer and a hydrophobic monomer as a monomer unit; the composition of the agent for treating the precursor of the three-dimensional object having at least one or more type of organic amine compounds selected from the group consisting of a secondary monoamine compound, a tertiary monoamine compound, a secondary diamine compound, and a tertiary diamine compound; in which a total content of alkali metal hydroxide and alkali metal carbonate is less than a content of the organic amine compound and less than 2.5% by mass. The present invention can provide a composition of an agent for treating a precursor of a three-dimensional object that is capable of removing the support material containing a (meth)acrylic acid-based copolymer more quickly than before.

## Claims

### Claim 1

A support material removing method comprising:
contacting (a) a precursor of a three-dimensional object containing a support material containing a (meth)acrylic acid-based copolymer having a hydrophilic monomer and a hydrophobic monomer as a monomer unit, with (b) a composition of an agent for treating the precursor of the three-dimensional object to remove the support material;
wherein the composition of the agent for treating the precursor of the three-dimensional object comprises:
at least one or more type of organic amine compounds selected from the group consisting of a secondary monoamine compound, a tertiary monoamine compound, a secondary diamine compound, and a tertiary diamine compound; wherein
a total content of alkali metal hydroxide and alkali metal carbonate is less than a content of the organic amine compound and less than 2.5% by mass.

### Claim 2 (depends on 1)

The support material removing method of claim 1, wherein the one or more organic amine compounds include an amine compound having an alcoholic hydroxy group.

### Claim 3 (depends on 2)

The support material removing method of claim 2, wherein the secondary monoamine compound is butylethanolamine.

### Claim 4 (depends on 2)

The support material removing method of claim 2, wherein the tertiary monoamine compound is at least one selected from the group consisting of dimethylaminoethanol, diethylaminoethanol, ethyldiethanolamine, and 6-dimethylamino-1-hexanol.

### Claim 5 (depends on 2)

The support material removing method of claim 2, wherein the secondary diamine compound is hydroxyethylpiperazine.

### Claim 6 (depends on 1)

The support material removing method of claim 1, wherein the tertiary diamine compound is at least one selected from the group consisting of tetramethylhexanediamine, tetramethylpropanediamine, and (2-dimethylaminoethyl) methylethanolamine.

### Claim 7 (depends on 1)

The support material removing method of claim 1, wherein the content of the one or more organic amine compounds in the composition of the agent for treating the precursor of the three-dimensional object is 0.5-20% by mass.

### Claim 8 (depends on 1)

The support material removing method of claim 1, wherein the hydrophilic monomer is methacrylic acid.

### Claim 9 (depends on 1)

The support material removing method of claim 1, wherein the hydrophobic monomer is at least one selected from the group consisting of butyl acrylate and styrene.

### Claim 10 (depends on 1)

The support material removing method of claim 1, wherein a pH of the composition of the agent for treating the precursor of the three-dimensional object is 10 to 14.