Support material comprising polyvinylalcohol and its use in xerographic additive manufacturing

Patent metadata

Field	Value
Publication number	US-9857710-B1
Application number	US-201615258190-A
Country	US
Kind code	B1
Filing date	Sep 7, 2016
Priority date	Sep 7, 2016
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A support material toner particle for use in xerographic additive manufacturing includes a polyvinyl alcohol (PVA) polymer and blend-additives including a chitosan and a polyvinylpyrrolidone (PVP), the amount of blend-additives is selected to adjust the Tg of the PVA polymer to be within about 1° C. to about 20° C. of a desired build material toner Tg. A xerographic toner system includes a build toner material and a support toner material, the support toner material includes a polyvinyl alcohol (PVA) polymer and blend-additives including a chitosan and a polyvinylpyrrolidone (PVP), the amount of blend-additives is selected to adjust the Tg of the PVA polymer to be within about 1° C. to about 20° C. of the build material toner Tg. A method of making a support toner material includes blending polyvinyl alcohol with blend additives including a chitosan and polyvinylpyrrolidone and forming support toner particles after the blending step.

First claim

What is claimed is:

1. A support material toner particle for use in xerographic additive manufacturing comprising:
a polyvinyl alcohol (PVA) polymer; and
blend-additives comprising:
a chitosan; and
a polyvinylpyrrolidone (PVP),
wherein the amount of blend-additives is selected to adjust the T g of the PVA polymer to be within about 1° C. to about 20° C. of a desired build material toner T g and further wherein the chitosan has a number average molecular weight from about 100,000 Daltons to about 1,000,000 Daltons.

2. The support material toner particle of claim 1 , wherein the amount of blend-additives is selected to adjust the T g of the PVA polymer to be within about 1° C. to about 10° C. of a desired build material toner T g .

3. The support material toner particle of claim 1 , further comprising toner surface additives.

4. The support material toner particle of claim 3 , wherein the toner surface additives comprise one or more of a silica, a titania, a silicone oil, or a charge control agent.

5. The support material toner particle of claim 1 , wherein the blend-additives further comprise a wax.

6. The support material toner particle of claim 1 , wherein the blend additives further comprise a colorant.

7. The support material toner particle of claim 1 , wherein the PVP has a number average molecular weight from about 1,000 Daltons to about 500,000 Daltons.

8. A xerographic toner system comprising:
a build toner material; and
a support toner material;
wherein the support toner material comprises:
a polyvinyl alcohol (PVA) polymer; and
blend-additives comprising:
a chitosan; and
a polyvinylpyrrolidone (PVP),
wherein the amount of blend-additives is selected to adjust the T g of the PVA polymer to be within about 1° C. to about 20° C. of the build toner material T g .

9. The xerographic toner system of claim 8 , wherein the amount of blend-additives is selected to adjust the T g of the PVA polymer to be within about 1° C. to about 10° C. of the build toner material T g .

10. The xerographic toner system of claim 8 , wherein the build material comprises acrylonitrile butadiene styrene (ABS).

11. The xerographic toner system of claim 10 , wherein the ABS has a T g of about 100 to about 130° C.

12. The xerographic toner system of claim 8 , wherein the build material comprises a nylon polyester.

13. The xerographic toner system of claim 12 , wherein the nylon polyester has a T g of about 80 to about 110° C.

14. The xerographic toner system of claim 8 , wherein the support toner material further comprises surface additives.

15. The xerographic toner system of claim 14 , wherein the surface additives comprise one or more of a silica, a titania, a silicone oil, or a charge control agent.

16. The xerographic toner system of claim 8 , wherein the blend additives further comprise a colorant.

17. A method of making a support toner material comprising:
blending polyvinyl alcohol with blend additives comprising a chitosan and polyvinylpyrrolidone; and
forming support toner particles after the blending step, wherein the polyvinylpyrrolidone has a number average molecular weight from about 1,000 Daltons to about 500,000 Daltons.

18. The method of claim 17 , further comprising blending surface additives with the support toner particles.

19. The method of claim 17 , wherein the amount of blend additives is selected to adjust the T g of the PVA polymer to be within about 1° C. to about 20° C. of a build material toner T g with which it will be used.

Assignees

• Xerox Corp

Inventors

• Sambhy Varun
• Facci John S
• Robles-Flores Eliud
• Derleth David S
• Craig David C

Classifications

• G03G9/08722

  Polyvinylalcohols; Polyallylalcohols; Polyvinylethers; Polyvinylaldehydes; Polyvinylketones; Polyvinylketals · CPC title

• G03G9/0874

  Polymers comprising hetero rings in the side chains · CPC title

• G03G15/224

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

• G03G9/08708

  Copolymers of styrene · CPC title

• G03G9/081

  by mixing the toner components in a liquefied state; melt kneading; reactive mixing · CPC title