# US 5,182,361 A · Method for the continuous preparation of aromatic polycarbonate having a high molecular weight with static mixer and plug flow

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- Number: US 5,182,361 A
- Document ID: US5182361A
- Status: Granted
- Kind: A
- Application number: 07/736,884
- Filed: 1991-07-29
- Granted: 1993-01-26
- Earliest claimed: 1990-08-29
- Assignees: General Electric Company
- Inventors: Hendricus H. Maria van Hout; Martin H. Oyevaar; Bert J. Held
- Web page: https://patentgrep.com/patent/US5182361A

## CPC

- C08G 64/30: using carbonates
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

The invention relates to a method of preparing aromatic polycarbonate having a high molecular weight by boundary face condensation of carbonate oligomer in the presence of an aromatic monohydroxy compound as a chain stopper, base, water and organic solvent at a temperature of at most 70.degree. C., in which the components, among which the chain stopper, are mixed in static mixers to form a fine dispersion, reacting these in a residence zone with plug flow and repeating these steps at least once.

## Claims

### Claim 1

A method for the continuous preparation of aromatic polycarbonate having a high molecular weight by boundary face condensation of carbonate oligomer with catalyst in the presence of an aromatic monohydroxy compound as a chain stopper, base, water and organic solvent at a temperature of at most 70.degree. C., comprising polycondensing is carried out by mixing components, in static mixers to form a fine dispersion and reacting the dispersion in a residence zone with plug flow and repeating this combination of steps at least once.

### Claim 2 (depends on 1)

A method as claimed in claim 1, characterised in that the combination of steps is repeated from 5 to 15 times.

### Claim 3 (depends on 1)

A method as claimed in claim 1, characterised in that the organic solvent, water, base and a small quantity of catalyst comprising oligomerisation product are mixed in the first static mixer with a further quantity of base, a further quantity of catalyst and the chain stopper.

### Claim 4 (depends on 1)

A method as claimed in claim 1, characterised in that the organic solvent, water, base optionally with a small quantity of catalyst containing oligomerisation product are mixed in the first static mixer with the chain stopper, a portion of the base and a small quantity of catalyst, adding the remaining quantity of base and catalyst in one or more of the subsequent static mixers.

### Claim 5 (depends on 1)

A method as claimed in claim 1, characterised in that the carbonate oligomer is first converted with the aromatic monohydroxy compound prior to polycondensation.

### Claim 6 (depends on 2)

A method as claimed in claim 2, characterised in that the organic solvent, water, base and a small quantity of catalyst comprising oligomerisation product are mixed in the first static mixer with a further quantity of base, a further quantity of catalyst and the chain stopper.

### Claim 7 (depends on 2)

A method as claimed in claim 2, characterised in that the organic solvent, water, base optionally with a small quantity of catalyst comprising oligomerisation product are mixed in the first static mixer with the chain stopper, a portion of the base and a small quantity of catalyst, adding the remaining quantity of base and catalyst in one or more of the subsequent static mixers.