# US H1,703 H · Removal of lithium from polymer cements

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- Number: US H1,703 H
- Document ID: USH1703H
- Status: Granted
- Kind: H
- Application number: 08/652,191
- Filed: 1996-05-23
- Granted: 1998-01-06
- Earliest claimed: 1996-05-23
- Assignees: Shell Oil Company
- Inventors: John David Wilkey; Zaida Diaz; Dale Lee Handlin, Jr.
- Web page: https://patentgrep.com/patent/USH1703H

## Abstract

A process for preparing a polymer cement which is relatively free of alkali metal salt by preparing the polymer cement with a polymerization terminating agent which is an acid which leaves alkali metal salt in the cement which is readily removable by centrifugation.

## Claims

### Claim 1

A process for removing alkali metal compounds from a polymer cement comprising:
preparing polymer cement of conjugated dienes with a polymerization terminating agent which is an acid selected from 2-ethylhexanoic acid, 12-hydroxyl stearic acid, oxalic acid, benzoic acid, and succinic acid and which leaves alkali metal salt in the cement; and
removing the alkali metal salt from the polymer cement.

### Claim 2 (depends on 1)

The process of claim 1 wherein the alkali metal is lithium.

### Claim 3 (depends on 1)

The process of claim 1 wherein the polymer cement is a functionalized mono-ol or diol having a number average molecular weight between 1000 and 20,000.

### Claim 4 (depends on 1)

The process of claim 1 wherein the terminating agent is oxalic acid.

### Claim 5 (depends on 1)

The process of claim 1 wherein the terminating agent is benzoic acid.

### Claim 6 (depends on 1)

The process of claim 1 wherein the terminating agent is 12-hydroxy stearic acid.

### Claim 7 (depends on 1)

The process of claim 1 wherein the terminating agent is succinic acid.

### Claim 8 (depends on 1)

The process of claim 1 wherein the alkali metal salt is removed from the polymer cement by centrifugation.

### Claim 9 (depends on 1)

The process of claim 1 wherein the alkali metal salt is removed from the polymer cement by filtration.