# US 4,394,476 A · Diester antioxidants

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,394,476 A
- Document ID: US4394476A
- Status: Granted
- Kind: A
- Application number: 06/396,935
- Filed: 1982-07-09
- Granted: 1983-07-19
- Earliest claimed: 1981-03-13
- Assignees: The Goodyear Tire & Rubber Company
- Inventors: Kirkwood S. Cottman
- Web page: https://patentgrep.com/patent/US4394476A

## CPC

- C08K 5/375: containing six-membered aromatic rings {(C08K5/3725 takes precedence)}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Esters of alkyl thiomercaptophenols, such as bis[2-(3,5-ditertiary butyl-4-hydroxyphenylthio)-1-methylethyl]thiodipropionate, used as antioxidants to stabilize polymers against oxidated degradation.

## Claims

### Claim 1

A polymer susceptible to oxidative degradation having incorporated therein a stabilizing amount of a compound having the following structural formula: ##STR7## wherein R is an alkylene radical containing 2 to 10 carbon atoms, a phenylene radical, or a radical of the structural formula:
--CH.sub.2 --CH.sub.2 --S--CH.sub.2 CH.sub.2 --.

### Claim 2 (depends on 1)

The polymer according to claim 1 wherein R is the radical:
--CH.sub.2 --CH.sub.2 --S--CH.sub.2 --CH.sub.2.

### Claim 3 (depends on 1)

The polymer according to claim 1 wherein R is a phenylene radical.

### Claim 4 (depends on 1)

The polymer according to claim 1 wherein R is an alkylene radical of 2 to 10 carbon atoms.

### Claim 5 (depends on 1)

The polymer according to claim 1 wherein the hydroxyl groups is para to the sulfur atom.