# US 4,391,953 A · Diene rubber compositions containing N,N'-dithioformanilide crosslinkers

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- Number: US 4,391,953 A
- Document ID: US4391953A
- Status: Granted
- Kind: A
- Application number: 06/299,891
- Filed: 1981-09-08
- Granted: 1983-07-05
- Earliest claimed: 1981-09-08
- Assignees: Monsanto Company
- Inventors: Eiichi Morita
- Web page: https://patentgrep.com/patent/US4391953A

## CPC

- C08K 5/43: Compounds containing sulfur bound to nitrogen
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Substituted or unsubstituted N,N'-dithiobisformanilide compounds are disclosed, where the substituents can be lower alkyl, lower alkoxy, halogen or CF.sub.3. The compounds are vulcanizing agents for diene rubbers. Diene rubber compounds containing a cross-linking amount of the above compounds are also disclosed.

## Claims

### Claim 1

A composition comprising diene rubber and a cross-linking amount of a compound of the formula ##STR7## wherein R.sub.1, R.sub.2, and R.sub.3 are the same or different substituents selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, chlorine and CF.sub.3.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the compound is N,N'-dithiobisformanilide.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the diene rubber is natural rubber, synthetic polyisoprene, neoprene, polybutadiene, EPDM, or a copolymer from butadiene and styrene or from butadiene and acrylonitrile.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the compound is N,N'-dithiobis(4-ethoxy-formanilide).

### Claim 5 (depends on 1)

The composition of claim 1 wherein the compound is present in an amount of from 0.1 to 5 parts by weight per 100 parts of diene rubber by weight.

### Claim 6 (depends on 1)

The composition of claim 1 wherein sulfur is also present.

### Claim 7 (depends on 1)

The composition of claim 1 wherein a vulcanization accelerator is also present.