Pht powder coating materials

Patent metadata

Field	Value
Publication number	US-2016108281-A1
Application number	US-201414516139-A
Country	US
Kind code	A1
Filing date	Oct 16, 2014
Priority date	Oct 16, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

A coating for an article may be made by applying a powder of a polyhemiaminal (PHA) polymer material to the article in a particulate form and then converting the PHA polymer material to a polyhexahydrotriazine (PHT) polymer material and fusing the particles into a monolithic coating by applying heat to the particles. The method generally includes forming a dilute reaction mixture comprising a formaldehyde reactant, a solvent, a primary aromatic diamine, and heating the reaction mixture to a temperature of between about 20° C. and about 120° C. for a short time to form a polymer. A particulate solid is precipitated by adding an excess volume of a non-solvent to the mixture. The powder may be applied to an article and then heated to fuse the powder into a coating and convert the PHA to PHT.

First claim

1 . A powder coating comprising a polyhexahydrotriazine.

2 . The powder coating of claim 1 , wherein the polyhexahydrotriazine is a material having a plurality of hexahydrotriazine groups with the general structure

wherein at least one starred bond of each hexahydrotriazine unit is covalently linked to a divalent linking group, and each divalent linking group is covalently linked to two hexahydrotriazine units.

3 . The powder coating of claim 2 , wherein each divalent linking group has the structure

wherein L′ is a divalent linking group selected from the group consisting of *—O—*, *—S—*, *—N(R′)—*, *—N(H)—*, *—R″—*, and combinations thereof, wherein R′ and R″ independently comprise at least 1 carbon, and each starred bond of each divalent linking group is covalently bonded to a respective starred bond of a hexahydrotriazine unit.

4 . The powder coating of claim 3 , wherein the polyhexahydrotriazine further comprises a plurality of monovalent groups, wherein each monovalent group is covalently linked to a hexahydrotriazine group.

5 - 19 . (canceled)

20 . An article comprising the powder coating of claim 3 .

Assignees

• IBM

Inventors

• Boday Dylan J
• Garcia Jeannette M
• Hedrick James L
• Wojtecki Rudy J

Classifications

• C09D181/02

  Polythioethers; Polythioether-ethers · CPC title

• C08G12/08 Primary

  aromatic · CPC title

• C08G12/46

  Block or graft polymers prepared by polycondensation of aldehydes or ketones on to macromolecular compounds · CPC title

• C09D179/04 Primary

  Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors · CPC title

• C09D5/03

  Powdery paints · CPC title