Support materials for 3d printing

Patent metadata

Field	Value
Publication number	US-2019211170-A1
Application number	US-201916356625-A
Country	US
Kind code	A1
Filing date	Mar 18, 2019
Priority date	Jan 16, 2014
Publication date	Jul 11, 2019
Grant date	—

Abstract

A three-dimensionally printed article comprises a build material and a support material, the support material comprising a hydroxypropyl methylcellulose having a DS of at least 1.0 and an MS of at least 0.6, wherein DS is the degree of substitution of methoxyl groups and MS is the molar substitution of hydroxypropoxyl groups. The support material can be removed from the build material by contacting the support material with water.

First claim

1 .- 8 . (canceled)

9 . A method of printing a three-dimensional article comprising:
selectively depositing layers of a fluid build material to form the three-dimensional article on a substrate; and supporting at least one of the layers of the build material with a support material, the support material comprising a hydroxypropyl methylcellulose having a DS of at least 1.0 and an MS of at least 0.6, wherein DS is the degree of substitution of methoxyl groups and MS is the molar substitution of hydroxypropoxyl groups, and the viscosity of the hydroxypropyl methylcellulose is up to 30 mPa·s, determined as a 2% by weight solution in water at 20° C.

10 . (canceled)

11 . The method of claim 9 , wherein the layers of the build material are deposited according to an image of the three-dimensional article in a computer readable format.

12 . The method of claim 11 further comprising hardening the build material.

13 . The method of claim 12 further comprising removing the support material from the build material by contacting the support material with water.

14 . (canceled)

15 . (canceled)

16 . The method of claim 9 wherein the amount of the hydroxypropyl methylcellulose is at least 50 weight percent of the total weight of the support material.

17 . The method of claim 9 wherein the hydroxypropyl methylcellulose has a DS of at least 1.4.

18 . The method of claim 9 wherein the hydroxypropyl methylcellulose has a DS of from 1.6 to 2.5.

19 . The method of claim 9 wherein the hydroxypropyl methylcellulose has an MS of from 0.6 to 1.7.

Assignees

• Dow Global Technologies Llc

Inventors

• Bayer Roland
• Pyzik Aleksander J
• Allen Sharon

Classifications

• B33Y10/00

  Processes of additive manufacturing · CPC title

• C08J2401/28

  Alkyl ethers · CPC title

• B29K2069/00

  Use of PC, i.e. polycarbonates {or derivatives thereof}, as moulding material · CPC title

• C08J2455/02

  Acrylonitrile-Butadiene-Styrene [ABS] polymers · CPC title

• C08J2467/04

  Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2467/06 takes precedence) · CPC title