Solvent-Free Emulsification of High Viscosity Resin

Patent metadata

Field	Value
Publication number	US-2016200879-A1
Application number	US-201514595634-A
Country	US
Kind code	A1
Filing date	Jan 13, 2015
Priority date	Jan 13, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A solvent-free emulsification process for making a latex where a high viscosity resin is prepared under pressure is described.

First claim

1 . A process of solvent free emulsion comprising:
a) heating at least one high viscosity resin to a temperature of about 90° C. or higher to form a heated resin in a reaction vessel comprising a mixing device; wherein the high viscosity resin comprises a resin having a melt viscosity of from about 10 to about 1,000,000 Pa*S at about 130° C.; b) combining the heated resin with a surfactant and a neutralization agent in the absence of an organic solvent to form a mixture in said reaction vessel; c) increasing pressure in said vessel to from about 10 to about 1000 kPa; d) adding water to said mixture to form an emulsion under agitation; and e) reducing pressure in said vessel to obtain a solvent-free emulsion comprising resin particles.

2 . The process of claim 1 , wherein the surfactant is present in an amount from about 1% to about 10% by weight of dry resin.

3 . The process of claim 1 , wherein the neutralization agent is present in an amount from about 1% to about 15% by weight of dry resin.

4 . The process of claim 1 , wherein amount of neutralization agent is adjusted based on acid value of the resin to obtain resin particles of a desired size.

5 . The process of claim 1 , wherein the resin particles comprises an average size of about 50 nm to about 900 nm.

6 . The process of claim 1 , wherein the high viscosity resin comprises a molecular weight of at least about 5,000.

7 . The process of claim 1 , wherein the high viscosity resin comprises a melt viscosity of from about 30 to about 500,000 Pa*S at about 130° C.

8 . The process according to claim 1 , wherein the neutralization agent comprises an inorganic basic agent or an organic basic agent.

9 . The process of claim 1 , wherein the neutralization agent comprises an organoamine, a monocyclic compound comprising at least one nitrogen atom, a polycyclic compound comprising at least one nitrogen atom or a secondary amine.

10 . The process of claim 1 , wherein the neutralization agent comprises ammonium hydroxide, potassium hydroxide, sodium hydroxide, sodium carbonate, sodium bicarbonate, lithium hydroxide, potassium carbonate or triethyl amine.

11 . The process of claim 1 , wherein said neutralization agent comprises an aziridine, an azetidine, a piperazine, a piperidine, a pyridine, a bipyridine, a terpyridine, a dihydropyridine, a morpholine, an N-alkylmorpholine, a 1,4-diazabicyclo[2.2.2]octane, a 1,8-diazabicycloundecane, a 1,8-diazabicycloundecene, a dimethylated pentylamine, a trimethylated pentylamine, a pyrrole, a pyrrolidine, a pyrrolidinone, an indole, an indoline, an indanone, a benzindazone, an imidazole, a benzimidazole, an imidazolone, an imidazoline, an oxazole, an isoxazole, an oxazoline, an oxadiazole, a thiadiazole, a carbazole, a quinoline, an isoquinoline, a naphthyridine, a triazine, a triazole, a tetrazole, a pyrazole, a pyrazoline or a combination thereof.

12 . The process of claim 1 , wherein the surfactant is selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants and combinations thereof.

13 . The process of claim 1 , wherein the high viscosity resin comprises a softening point of at least about 120° C.

14 . The process of claim 1 , wherein the high viscosity resin comprises a polyester resin.

15 . A process of solvent free emulsion comprising:
a) heating at least one high viscosity polyester resin comprising a softening point of at least about 115° C. to a temperature of about 110° C. to about 120° C. to form a heated resin in a reaction vessel comprising a mixing device; wherein the high viscosity resin comprises a resin having a melt viscosity of from about 10 to about 1,000,000 Pa*S at about 130° C.; b) combining the heated resin with a surfactant and a neutralization agent in the absence of an organic solvent to form a mixture in said reaction vessel; c) increasing pressure in said vessel above 1 atmosphere; d) adding water to said mixture to form an emulsion; and e) reducing pressure in said vessel to obtain a solvent-free emulsion comprising resin particles.

16 . The process of claim 15 , wherein the neutralization agent is present in an amount from about 1% to about 15% by weight of dry resin.

17 . The process of claim 15 , wherein amount of neutralization agent is adjusted based on acid value of the resin to obtain resin particles of a desired size.

18 . The process of claim 15 , wherein the resin particles comprise an average size of about 50 nm to about 900 nm.

19 . The process of claim 15 , wherein the high viscosity resin comprises a molecular weight of at least about 5,000.

20 . The process of claim 12 , wherein the high viscosity resin comprises a melt viscosity of from about 30 to about 500,000 Pa*S at about 130° C.

Assignees

• Xerox Corp

Inventors

• Zhou Ke
• Hu Nan-Xing
• Sacripante Guerino G

Classifications

• G03G9/08755

  Polyesters · CPC title

• C08J2367/00

  Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers · CPC title

• C08J3/05 Primary

  from solid polymers · CPC title

• G03G9/0804

  whereby the components are brought together in a liquid dispersing medium · CPC title

• C08J3/07 Primary

  from polymer solutions · CPC title