# US 2013/0281584 A1 · Process for Making Polyurea Particles

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- Number: US 2013/0281584 A1
- Document ID: US20130281584A1
- Status: Published application
- Kind: A1
- Application number: 13/979,151
- Filed: 2011-12-15
- Published: 2013-10-24
- Earliest claimed: 2011-01-13
- Assignees: Huntsman International LLC
- Inventors: Steve Andre Woutters; Chris Ian Lindsay
- Web page: https://patentgrep.com/patent/US20130281584A1

## CPC

- C08G 71/02: Polyureas
- C08G 18/0852: {the solvents being organic}
- C08G 18/2865: {Compounds having only one primary or secondary amino group; Ammonia}
- C08G 18/3228: {acyclic}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A method for providing urea particles in a solvent medium, said method comprising at least the steps of: providing at least one polyisocyanate component dissolved in a first solvent; providing at least one isocyanate-reactive polyamine component dissolved in a second solvent; providing at least one isocyanate-reactive monoamine, optionally dissolved in a third solvent; combining and reacting said isocyanate-reactive monoamine optionally dissolved in said third solvent with said polyisocyanate dissolved in said first solvent, thereby providing an urea-modified polyisocyanate dissolved in said first solvent and said optionally third solvent, and then combining and reacting said urea-modified polyisocyanate dissolved in said first solvent and said optionally third solvent with said polyamine component dissolved in said second solvent.

## Claims

### Claim 1

A method for providing urea particles having an equivalent diameter in the range 50 nm up to 700 nm in a solvent medium, said method comprising at least the steps of
providing at least one polyisocyanate component dissolved in a first solvent;
providing at least one isocyanate-reactive polyamine component dissolved in a second solvent;
providing at least one isocyanate-reactive monoamine, optionally dissolved in a third solvent;
combining and reacting said isocyanate-reactive monoamine optionally dissolved in said third solvent with said polyisocyanate dissolved in said first solvent, thereby providing an urea-modified polyisocyanate dissolved in said first solvent and said optionally third solvent, and then
combining and reacting said urea-modified polyisocyanate dissolved in said first solvent and said optionally third solvent with said polyamine component dissolved in said second solvent.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said isocyanate-reactive monoamine is dissolved in a third solvent.

### Claim 3 (depends on 2)

The method according to claim 2, wherein said third solvent is identical to said first solvent.

### Claim 4 (depends on 2)

The method according to claim 2, wherein said third solvent is identical to said second solvent.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the first solvent is a ketone.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the ketone is acetone.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the first solvent is tetrahydrofuran (THF).

### Claim 8 (depends on 1)

The method according to claim 1, wherein the first solvent is a polyol.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the second solvent is water.

### Claim 10 (depends on 1)

The method according to, claim 1 wherein the second solvent is a polyol.

### Claim 11 (depends on 1)

The method according to claim 1 wherein said first and said second solvent are identical.

### Claim 12 (depends on 1)

The method according to claim 1, wherein said first and second solvent are polyols.

### Claim 13

(canceled)

### Claim 14

(canceled)