Composition comprising an internal phase dispersed in a hydrophilic continuous phase

Patent metadata

Field	Value
Publication number	US-2015273420-A1
Application number	US-201314436099-A
Country	US
Kind code	A1
Filing date	Oct 15, 2013
Priority date	Oct 16, 2012
Publication date	Oct 1, 2015
Grant date	—

Abstract

The composition, advantageously an emulsion or a foam, includes an internal phase dispersed in a hydrophilic continuous phase, the percentage of the internal phase being higher than 50%. The emulsion composition contains nanocrystals of a polysaccharide other than cellulose, advantageously chitin, that are located at the interface between the internal phase and the hydrophilic continuous phase.

First claim

1 . Composition comprising an internal phase dispersed in a hydrophilic continuous phase, the percentage of the internal phase being higher than 50%, characterized in that said composition contains nanocrystals of a polysaccharide other than cellulose, which are located at the interface between said internal phase and said hydrophilic continuous phase.

2 . Composition according to claim 1 , characterized in that the nanocrystals of a polysaccharide other than cellulose are selected from nanocrystals which are positively charged.

3 . Composition according to claim 2 , characterized in that the nanocrystals of polysaccharide are selected from:
(i) exclusively positively charged polysaccharide nanocrystals, excluding cellulose nanocrystals, or (ii) positively charged polysaccharide nanocrystals, other than cellulose, mixed with nanocrystals derived from at least one negatively charged polysaccharide.

4 . Composition according to claim 2 , characterized in that the nanocrystals of a polysaccharide other than cellulose are selected from chitin nanocrystals.

5 . Composition according to claim 1 , characterized in that it consists in an emulsion or a foam.

6 . Composition according to claim 1 , characterized in that said composition consists in an emulsion (i) of the high internal phase or HIPE type, having a percentage of internal phase higher than 75%, or (ii) of the medium internal phase or MIPE type, having a percentage of internal phase ranging between 50% and 75%.

7 . Product obtained from a composition according to claim 1 , selected from dry emulsion, solid foam, porous polymer material or polymer material beads.

8 . Process for obtaining a composition comprising an internal phase dispersed in a hydrophilic continuous phase, the percentage of the internal phase being higher than 50%, which process is characterized in that it comprises the following operations:
a) an operation of incorporating nanocrystals of a polysaccharide other than cellulose, in a hydrophilic phase, (b) an operation of providing said hydrophilic phase containing the polysaccharide nanocrystals and a phase for constituting said internal phase, c) an operation of forming said composition by dispersing said internal phase in said hydrophilic phase.

9 . Process according to claim 8 , characterized in that the polysaccharide nanocrystals incorporated in operation a) are selected from nanocrystals which are positively charged.

10 . Process according to claim 9 , characterized in that the polysaccharide nanocrystals incorporated in operation a) are selected from:
(i) exclusively positively charged polysaccharide nanocrystals, excluding cellulose nanocrystals, or (ii) positively charged polysaccharide nanocrystals, other than cellulose, mixed with nanocrystals derived from at least one negatively charged polysaccharide.

11 . Process according to claim 9 , characterized in that the polysaccharide nanocrystals incorporated in operation a) are selected from chitin nanocrystals.

12 . Process according to claim 8 , characterized in that, at the end of the operation c), the obtained composition consists in an emulsion or a foam.

13 . Process according to claim 8 , characterized in that the composition is an emulsion composition comprising a hydrophobic internal phase and a hydrophilic continuous phase, and in that operation c) of forming the emulsion comprises:
c.1) a step of obtaining an intermediate oil-in-water emulsion having a volume ratio hydrophobic internal phase/hydrophilic continuous phase of at least 5/95, c.2) a step of obtaining the emulsion composition having a percentage of internal phase higher than 50%, comprising: c.2.1) a step of adding a hydrophobic phase volume to the intermediate emulsion obtained in step c.1), and stirring the mixture thus obtained, and/or c.2.2) a step of concentrating the intermediate emulsion obtained in step c.1) by removing at least a part of said hydrophilic phase.

14 . Process according to claim 13 , characterized in that in step c.1), the intermediate oil-in-water emulsion has a percentage of internal phase that is equal to or less than 50%.

15 . Process according to claim 8 , characterized in that the composition is an emulsion composition comprising a hydrophobic internal phase and a hydrophilic continuous phase, and in that operation c) of forming the emulsion consists in mixing the polysaccharide nanocrystal containing hydrophilic phase and the hydrophobic internal phase to directly obtain said emulsion having a percentage of internal phase higher than 50%.

16 . Process according to claim 8 , characterized in that, at the end of step c), the emulsion composition formed is (i) of the high internal phase or HIPE type, having a percentage of internal phase higher than 75%, or (ii) of the medium internal phase or MIPE type, having a percentage of internal phase ranging between 50% and 75%.

17 . Composition according to claim 3 , characterized in that the nanocrystals of a polysaccharide other than cellulose are selected from chitin nanocrystals.

18 . Process according to claim 10 , characterized in that the polysaccharide nanocrystals incorporated in operation a) are selected from chitin nanocrystals.

19 . Process according to claim 9 , characterized in that the composition is an emulsion composition comprising a hydrophobic internal phase and a hydrophilic continuous phase, and in that operation c) of forming the emulsion comprises:
c.1) a step of obtaining an intermediate oil-in-water emulsion having a volume ratio hydrophobic internal phase/hydrophilic continuous phase of at least 5/95, c.2) a step of obtaining the emulsion composition having a percentage of internal phase higher than 50%, comprising: c.2.1) a step of adding a hydrophobic phase volume to the intermediate emulsion obtained in step c.1), and stirring the mixture thus obtained, and/or c.2.2) a step of concentrating the intermediate emulsion obtained in step c.1) by removing at least a part of said hydrophilic phase.

20 . Process according to claim 10 , characterized in that the composition is an emulsion composition comprising a hydrophobic internal phase and a hydrophilic continuous phase, and in that operation c) of forming the emulsion comprises:
c.1) a step of obtaining an intermediate oil-in-water emulsion having a volume ratio hydrophobic internal phase/hydrophilic continuous phase of at least 5/95, c.2) a step of obtaining the emulsion composition having a percentage of internal phase higher than 50%, comprising: c.2.1) a step of adding a hydrophobic phase volume to the intermediate emulsion obtained in step c.1), and stirring the mixture thus obtained, and/or c.2.2) a step of concentrating the intermediate emulsion obtained in step c.1) by removing at least a part of said hydrophilic phase.

Assignees

• Agronomique Inst Nat Rech

Inventors

• Capron Isabelle
• Bizot Herve
• Cathala Bernard

Classifications

• C08J9/28 Primary

  by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum · CPC title

• C08J2305/08

  Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof · CPC title

• B01F17/005 Primary

  Operations & Transport · mapped topic

• C08J2201/052

  Inducing phase separation by thermal treatment, e.g. cooling a solution · CPC title

• C08J9/30

  by mixing gases into liquid compositions or plastisols, e.g. frothing with air · CPC title