# US 4,327,232 A · Cyclopropane ring-containing compounds as inhibitor components in methylchloroform

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

- Number: US 4,327,232 A
- Document ID: US4327232A
- Status: Granted
- Kind: A
- Application number: 06/235,883
- Filed: 1981-02-19
- Granted: 1982-04-27
- Earliest claimed: 1981-02-19
- Assignees: The Dow Chemical Company
- Inventors: Alvetta Pryor; Nobuyuki Ishibe
- Web page: https://patentgrep.com/patent/US4327232A

## CPC

- C11D 7/261: {Alcohols; Phenols}
- C07C 17/42: Use of additives, e.g. for stabilisation
- C11D 7/5018: {Halogenated solvents}
- C23G 5/02858: {Hydrocarbons}
- C23G 5/02861: {Oxygen-containing compounds}
- C11D 7/266: {Esters or carbonates}
- C11D 7/28: containing halogen
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C23G: CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS

## Abstract

A stabilized methylchloroform solvent useful in degreasing operations in which the alkylene oxide stabilizer component normally employed is replaced by a tricyclic or quadricyclic compound containing a fused cyclopropane ring.

## Claims

### Claim 1

In a stabilizer formulation useful in stabilizing methylchloroform used in vapor degreasing wherein said formulation contains an alkylene oxide as a component of said stabilizer, the improvement which comprises employing a bicyclic, a tricyclic or a quadricyclic compound which contains a fused cyclopropane ring in place of the epoxide in said formulation.

### Claim 2 (depends on 1)

A stabilizer formulation according to claim 1 which contains from 1.75 to 3.5% 2-methyl-2-butyn-2-ol, 0 to 4.25% of t-amyl alcohol, 0.5 to 2% nitroalkane and 0.2 to 2% of said tricyclic or quadricyclic compound based on the total volume of methylchloroform and stabilizers.

### Claim 3 (depends on 2)

The composition of claim 2 wherein the tricyclic or quadricyclic compound is present in a concentration of from about 0.5 to about 1.0%.

### Claim 4 (depends on 2)

The composition of claim 2 wherein the tricyclic compound is nortricyclyl formate.

### Claim 5 (depends on 2)

The composition of claim 2 wherein the quadricyclic compound is quadricyclane.

### Claim 6 (depends on 2)

The composition of claim 2 wherein the bicyclic compound is norcarane.