# US 10,865,263 B2 · Solution polymerization in isopropanol and water

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- Number: US 10,865,263 B2
- Document ID: US10865263B2
- Status: Granted
- Kind: B2
- Application number: 16/341,565
- Filed: 2017-10-24
- Published: 2020-05-21
- Granted: 2020-12-15
- Earliest claimed: 2016-11-29
- Assignees: Rohm and Haas Company; Union Carbide Corporation
- Applicants: Rohm and Haas Company; Union Carbide Corporation
- Inventors: Scott Backer; Randara Pulukkody; Mahesh R. Sawant; Eric P. Wasserman
- Web page: https://patentgrep.com/patent/US10865263B2

## CPC

- C08F 218/08: Vinyl acetate
- C08F 2/06: Organic solvent
- C08F 2/10: Aqueous solvent
- C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- C08F 222/02: Acids; Metal salts or ammonium salts thereof {, e.g. maleic acid or itaconic acid}
- C08F 2800/20: as weight or mass percentages
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A method for solution polymerization. The method comprises polymerizing in a solvent a monomer mixture comprising: (a) 5 to 95 wt % of a C3-C5 ethylenically unsaturated dicarboxylic acid; and (b) 5 to 95 wt % of vinyl acetate; wherein the solvent comprises 51 to 88 wt % isopropanol and 12 to 49 wt % water.

## Claims

### Claim 1

A method for solution polymerization; said method comprising polymerizing in a solvent a monomer mixture comprising: (a) 5 to 75 wt % of a C3-C5 ethylenically unsaturated dicarboxylic acid; (b) 10 to 60 wt % of vinyl acetate; and (c) 10 to 50 wt % (meth)acrylic acid; wherein the solvent comprises 51 to 88 wt % isopropanol and 12 to 49 wt % water.

### Claim 2 (depends on 1)

The method of claim 1 in which the monomer mixture comprises:
(i) 10 to 45 wt % itaconic acid, (ii) 20 to 50 wt % of vinyl acetate; and (iii) 15 to 45 wt % acrylic acid.

### Claim 3 (depends on 2)

The method of claim 2 in which the solvent comprises 60 to 85 wt % isopropanol and 15 to 40 wt % water.

### Claim 4 (depends on 3)

The method of claim 3 in which the polymer has Mw from 2,000 to 70,000.

### Claim 5 (depends on 4)

The method of claim 4 in which an isopropanol-water azeotrope is distilled and recycled to a polymerization reaction.

### Claim 6

A method for solution polymerization; said method comprising polymerizing in a solvent a monomer mixture comprising: (a) 5 to 95 wt % of a C3-C5 ethylenically unsaturated dicarboxylic acid; and (b) 5 to 95 wt % of vinyl acetate; wherein the solvent comprises 51 to 88 wt % isopropanol and 12 to 49 wt % water.

### Claim 7 (depends on 6)

The method of claim 6 in which the polymer comprises polymerized units of:
(i) 20 to 58 wt % itaconic acid and (ii) 42 to 80 wt % of vinyl acetate.

### Claim 8 (depends on 7)

The method of claim 7 in which the solvent comprises 60 to 85 wt % isopropanol and 15 to 40 wt % water.

### Claim 9 (depends on 8)

The method of claim 8 in which the polymer has Mw from 2,000 to 70,000.

### Claim 10 (depends on 9)

The method of claim 9 in which an isopropanol-water azeotrope is distilled and recycled to a polymerization reaction.