Roller coating

• US 9,684,267 B2
• Filed: 08/24/2011
• Issued: 06/20/2017
• Est. Priority Date: 08/24/2011
• Status: Active Grant

• Current Assignee: Hewlett-Packard Indigo BV (HP Inc.)
• Original Assignee: Hewlett-Packard Indigo BV (HP Inc.)
• Inventors: Tanchangco, Daniel, Li, Guang Jin
• Primary Examiner(s): Tran, Thao T
• Application Number:
  US14/343,018
• Publication Number:
  US 20140295089A1
• Time in Patent Office: 2,127 Days
• Field of Search: 399286, 492 18, 4273855, 427387, 427487, 528 44
• CPC Class Codes: C08G 18/3225 Polyamines
• CPC Class Codes: C08G 18/61 Polysiloxanes
• CPC Class Codes: C08G 18/7664 containing alkylene polyphenyl groups
• CPC Class Codes: C08G 18/7671 containing only one alkylene bisphenyl group
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09D 175/02 Polyureas
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: G03G 15/10 using a liquid developer

Abstract

A method of preparing the surface of a roller comprising adding a coating comprising isocyanate to a ground surface of the roller. A roller comprising a ground surface, the ground surface having unreacted hydroxyl (—OH) groups on the surface of the roller and a layer of isocyanate layered over the unreacted hydroxyl (—OH) groups on the surface of the roller, the isocyanate forming a urethane bond on the surface of the roller.

Claims

1. A method of preparing a surface of a roller, comprising:

grinding the surface of the roller, the surface being made from natural rubber, synthetic rubber, polyurethane, or epichlorohydrin; and

adding a coating comprising isocyanate and non-functional polydimethylsiloxane to the ground surface of the roller, wherein the isocyanate reacts with a polyol in the ground surface to form a chemical bond, wherein all oxygen atoms in the polydimethylsiloxane are each bonded to two silicon atoms, and all silicon atoms in the polydimethylsiloxane are bonded only to oxygen atoms and alkyl groups.

2. The method of claim 1, in which the coating forms a polyurethane bond with the roller.

3. The method of claim 2, in which excess isocyanate within the coating is cured by moisture to form polyurea, the formation of polyurea accelerated by a catalyst.

4. The method of claim 1, in which adding the coating comprising isocyanate to the surface of the roller creates a urethane bond with unreacted hydroxyl (—

OH) groups on the surface of the roller.

5. The method of claim 1, in which the coating further comprises a functional silicone.

6. The method of claim 1, further comprising forming the roller by:

placing an inner core into a mold;

pouring an amount of an outer layer material around the core;

curing the material to form the roller having an outer layer; and

removing the roller from the mold;

wherein the outer layer is the surface that is exposed to the grinding.

7. The method of claim 1, wherein the isocyanate comprises polymeric diphenylmethane diisocyanate.

8. The method of claim 1, wherein the isocyanate is mixed with a solvent that is free of hydroxyl groups.

9. The method of claim 1, wherein the grinding of the surface of the roller generates a surface roughness of less than 0.4 μ

m.

10. The method of claim 1, wherein the surface includes an ionic salt.

11. The method of claim 1, wherein the coating further comprises a lithium salt.

12. The method of claim 11, wherein the lithium salt is lithium (bis)Trifluoromethanesulfonimide.

13. A roller comprising:

a ground surface;

the ground surface having unreacted hydroxyl (—

OH) groups on the surface of the roller; and

a layer of isocyanate and non-functional polydimethylsiloxane layered over the unreacted hydroxyl (—

OH) groups on the surface of the roller;

the isocyanate forming a urethane bond with the hydroxyl groups on the surface of the roller,

wherein the unreacted hydroxyl groups on the surface of the roller are provided by polyols, all oxygen atoms in the polydimethylsiloxane are each bonded to two silicon atoms, and all silicon atoms in the polydimethylsiloxane are bonded only to oxygen atoms and alkyl groups.

14. The roller of claim 13, in which the isocyanate reacts with moisture to form a polyurea.

15. The roller of claim 13, in which the isocyanate reacts with an organic amine to form a polyurea.

16. A method of preparing a developer roller, comprising:

grinding a surface of the developer roller;

adding a mixture of isocyanate and silicone coating to the ground surface of the developer roller, wherein the silicone is a non-functional polydimethylsiloxane wherein all oxygen atoms in the polydimethylsiloxane are each bonded to two silicon atoms and all silicon atoms in the polydimethylsiloxane are bonded only to oxygen atoms and alkyl groups; and

curing the coating wherein the mixture of isocyanate and silicone coating forms a urethane bond with the surface of the developer roller.