Powder, thermoplastic composition, and method for producing three-dimensional object

Patent metadata

Field	Value
Publication number	US-10731025-B2
Application number	US-201715604505-A
Country	US
Kind code	B2
Filing date	May 24, 2017
Priority date	Nov 28, 2014
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A powder contains particles containing a water-soluble material and a water-insoluble material. When dependence on temperature of a storage elastic modulus and a loss elastic modulus of a cylindrical compact of the powder in a shear direction, the cylindrical compact having a diameter of 10 mm and a thickness of 1 mm, is measured with a rotational rheometer at an angular frequency of 1 Hz and a rate of temperature increase of 2° C./min, letting a temperature at which the storage elastic modulus is 1 MPa be T° C., the storage elastic modulus is always higher than the loss elastic modulus in a temperature range of T° C. to (T+10)° C.

First claim

The invention claimed is:

1. A thermoplastic composition comprising:
a water-soluble material and cellulose nanofibers,
wherein the water-soluble material comprises a poly(alkylene oxide) or a poly(vinyl alcohol),
wherein the content of the water-soluble material is 50% by mass or more and 95% by mass or less when the total mass of the thermoplastic composition is 100% by mass, and
wherein the thermoplastic composition is a constituent material used in an additive manufacturing process.

2. The thermoplastic composition according to claim 1 , wherein the cellulose nanofibers are contained in an amount of 15% or more by mass and less than 50% by mass per 100% of the total mass of the thermoplastic composition.

3. The thermoplastic composition according to claim 1 , wherein a storage elastic modulus of the thermoplastic composition is greater than a loss elastic modulus of the thermoplastic composition in a temperature range of T° C. or higher and (T+10°) C. or lower, T being a temperature at which the storage elastic modulus of the thermoplastic composition is 1 MPa, and
wherein the storage elastic modulus and the loss elastic modulus of the thermoplastic composition are obtained by:
pressure forming the thermoplastic composition into a cylindrical compact having a diameter of 10 mm and a thickness of 1 mm, and
measuring temperature dependency of a storage elastic modulus and a loss elastic modulus of the cylindrical compact in a shear direction using a rotational rheometer at an angular frequency of 1 Hz while raising the temperature at a rate of 2° C./minute.

4. The thermoplastic composition according to claim 1 , wherein the thermoplastic composition contains a first water-soluble material and a second water-soluble material.

Assignees

• Canon Kk

Inventors

• Hanyu Yukio
• Saito Tomohiro
• Sugiyama Akira
• Sato Naotake
• Takahashi Masahiko

Classifications

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title

• B32B5/16 Primary

  characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)} · CPC title

• B29C64/147

  using sheet material, e.g. laminated object manufacturing [LOM] or laminating sheet material precut to local cross sections of the 3D object · CPC title

• B32B2264/062

  Cellulose particles, e.g. cotton · CPC title

• G03G15/224

  Machines for forming tactile or three dimensional images by electrographic means, e.g. braille, 3d printing · CPC title