Method for producing oil-in-water emulsion

Patent metadata

Field	Value
Publication number	US-2024174817-A1
Application number	US-202218284656-A
Country	US
Kind code	A1
Filing date	May 16, 2022
Priority date	May 18, 2021
Publication date	May 30, 2024
Grant date	—

Abstract

In a method for producing an oil-in-water emulsion, a jet of an oil-in-water pre-emulsion (L 1 ) containing an oil phase dispersed in a first aqueous phase is added to a second aqueous phase (L 2 ).

First claim

1 . A method for producing an oil-in-water emulsion, the method comprising:
adding to a second aqueous phase a jet of an oil-in-water pre-emulsion containing an oil phase dispersed in a first aqueous phase at a linear velocity of 5 m/s or higher.

2 . The method of claim 1 , wherein the second aqueous phase has a viscosity from 0.1 mPa·s to 20,000 mPa·s inclusive at a temperature at which the jet of the pre-emulsion is added.

3 . The method of claim 1 , wherein the second aqueous phase has a viscosity from 1 mPa·s to 10,000 mPa·s inclusive at a temperature at which the jet of the pre-emulsion is added.

4 . The method of claim 1 , wherein using a blending tank having a jet discharge section, the jet of the pre-emulsion is added from the jet discharge section to the second aqueous phase stored in the blending tank.

5 . The method of claim 1 , wherein a mass ratio of a content of the oil phase to a content of the first aqueous phase in the pre-emulsion is from 0.01 to 4 inclusive.

6 . The method of claim 1 . wherein a mass ratio of a content of the oil phase to a content of the first aqueous phase in the pre-emulsion is from 0.1 to 3 inclusive.

7 . The method of claim 1 , wherein the oil phase in the pre-emulsion has an average particle diameter of 2,000 μm or less.

8 . The method of claim 1 , wherein the oil phase in the pre-emulsion has an average particle diameter from 10 μm to 500 μm inclusive.

9 . The method of claim 1 , wherein the oil phase in the pre-emulsion has an average particle diameter from 10 μm to 100 μm inclusive.

10 . The method of claim 1 , wherein the pre-emulsion has a viscosity from 1 mPa·s to 15,000 mPa·s inclusive at a temperature at which the jet of the pre-emulsion is added to the second aqueous phase.

11 . The method of any one of claims 1 to 10 , wherein the oil phase contains an oil and/or a silicone The method of claim 1 . wherein the pre-emulsion has a viscosity from 10 mPa·s to 6.000 mPa·s inclusive at a temperature at which the jet of the pre-emulsion is added to the second aqueous phase.

12 . The method of claim 1 , wherein the viscosity of the second aqueous phase (at a temperature at which the jet of the pre-emulsion is added) is lower than the viscosity of the pre-emulsion (at a temperature at which the jet of the pre-emulsion is added to the second aqueous phase).

13 . The method of claim 1 , wherein the second aqueous phase has a same constituent component as that of the first aqueous phase in the pre-emulsion.

14 . The method of claim 1 , wherein the oil phase contains an oil and/or a silicone.

15 . The method of claim 1 . wherein the oil phase in the produced oil-in-water emulsion has an average particle diameter of 35 μm or less.

16 . The method of claim 1 , wherein the oil phase in the produced oil-in-water emulsion has an average particle diameter from 1 μm to 20 μm inclusive.

17 . The method of claim 1 , wherein the adding of the jet of the pre-emulsion to the second aqueous phase is performed using a nozzle.

18 . The method of claim 17 , wherein the nozzle has an inner diameter from 0.01 mm to 20 mm inclusive.

19 . The method of claim 1 , wherein the linear velocity of the pre-emulsion during addition of the jet of the pre-emulsion to the second aqueous phase is from 10 m/s to 100 m/s inclusive.

20 . The method of claim 1 , wherein a shear rate of the pre-emulsion during addition of the jet of the pre-emulsion to the second aqueous phase is from 2,500 s −1 to 500,000 s −1 inclusive.

21 . The method of claim 1 , wherein a shear rate of the pre-emulsion during addition of the jet of the pre-emulsion to the second aqueous phase is from 5,000 s −1 to 400,000 s −1 inclusive.

Assignees

• Kao Corp

Inventors

• Hirabayashi Daiki
• Takagi Michiya
• Nakayama Minami
• Watanabe Daiki
• Kinoshita Takafumi

Classifications

• C08J3/05 Primary

  from solid polymers · CPC title

• B01F23/4105

  Methods of emulsifying · CPC title

• B01F23/4145

  Emulsions of oils, e.g. fuel, and water · CPC title

• B01F23/451

  by injecting one liquid into another · CPC title

• B01F25/20

  Jet mixers, i.e. mixers using high-speed fluid streams (using jets to create vortex flow B01F25/10) · CPC title