# US 7,745,556 B2 · Polymerisation of vinyl chloride monomer

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- Number: US 7,745,556 B2
- Document ID: US7745556B2
- Status: Granted
- Kind: B2
- Application number: 11/792,085
- Filed: 2005-12-14
- Published: 2009-05-28
- Granted: 2010-06-29
- Earliest claimed: 2004-12-14
- Assignees: Ineos Technologies (Vinyls) Limited
- Inventors: Paul A Ferguson; Jill Galligan; Raymond J Harvey
- Web page: https://patentgrep.com/patent/US7745556B2

## CPC

- C08F 14/06: Vinyl chloride
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A copolymer of (i) an alkyl acrylate or alkyl methacrylate and (ii) a hydroxyalkyl acrylate or hydroxyalkyl methacrylate is used as a secondary protective colloid in the suspension polymerization of vinyl chloride monomer. The alkyl group of the alkyl acrylate or alkyl methacrylate is preferably a 2-ethylhexyl group. The hydroxyalkyl group of the hydroxyalkyl acrylate or hydroxyalkyl methacrylate is preferably a hydroxyethyl group.

## Claims

### Claim 1

A process for polymerizing vinyl chloride monomer, comprising subjecting vinyl chloride monomer to suspension polymerization in the presences of a copolymer of (i) an alkyl acrylate or alkyl methacrylate and (ii) a hydroxyalkyl acrylate or hydroxyalkyl methacrylate as a secondary type protective colloid, wherein the alkyl group of said alkyl acrylate or alkyl methacrylate is a C3 to C16 alkyl group, wherein said copolymer comprises from 20% to 50% by weight of alkyl acrylate or methacrylate moieties and from 80% to 50% by weight of hydroxyalkyl acrylate or methacrylate moieties and wherein said copolymer has a peak average molecular weight as determined by reversed phase liquid chromatography of from 5000 to 50000.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the alkyl group of said alkyl acrylate or alkyl methacrylate is a 2-ethylhexyl group.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the hydroxyalkyl group of said hydroxyalkyl acrylate or hydroxyalkyl methacrylate is a C1 to C6 hydroxyalkyl group.

### Claim 4 (depends on 3)

The process according to claim 3, wherein the hydroxyalkyl group of said hydroxyalkyl acrylate or hydroxyalkyl methacrylate is a hydroxyethyl group.

### Claim 5 (depends on 1)

The process according to claim 1, wherein said copolymer comprises from 25% to 50% by weight of alkyl acrylate or methacrylate moieties and from 75% to 50% by weight of hydroxyalkyl acrylate or methacrylate moieties.

### Claim 6 (depends on 1)

The process according to claim 1, wherein said copolymer is used in an amount of from 50 to 2000 ppm by weight of vinyl chloride monomer.

### Claim 7 (depends on 1)

The process according to claim 1, wherein said copolymer has a peak average molecular weight as determined by reversed phase quid chromatography of from 6000 to 20000.

### Claim 8 (depends on 1)

The process according to claim 1, wherein said copolymer has a peak average molecular weight as determined by reversed phase liquid chromatography of from 8000 to 14000.

### Claim 9 (depends on 6)

The process according to claim 6, wherein said copolymer is used in an amount of from 100 to 1500 ppm by weight of vinyl chloride monomer.

### Claim 10 (depends on 6)

The process according to claim 6, wherein said copolymer is used in an amount of from 200 to 1000 ppm by weight of vinyl chloride monomer.