# US 4,394,495 A · Diisocyanates useful as a structural component in the preparation of polyurethane plastics

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- Number: US 4,394,495 A
- Document ID: US4394495A
- Status: Granted
- Kind: A
- Application number: 06/344,120
- Filed: 1982-01-29
- Granted: 1983-07-19
- Earliest claimed: 1981-02-17
- Assignees: Bayer Aktiengesellschaft
- Inventors: Hans-Joachim Scholl
- Web page: https://patentgrep.com/patent/US4394495A

## CPC

- C07C 265/12: having isocyanate groups bound to carbon atoms of six-membered aromatic rings
- C08G 18/7614: {containing only one aromatic ring}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A mixture of homologues and isomers of hydrocarbons corresponding to the formula ##STR1## in which R represents a saturated, straight-chained aliphatic hydrocarbon radical having 8-15 carbon atoms, which mixture, at 1013 mbar, has a boiling range according to ASTM D 86 of 10.degree.-50.degree. C. within the temperature range of from 270.degree.-330.degree. C. is nitrated, hydrogenated and phosgenated. The product diisocyanate which is liquid, readily soluble, has a lower vapor pressure than TDI, does not tend to crystallize at room temperature and is virtually free of monoisocyanates is a mixture of homologues and isomers corresponding to the formula ##STR2## in which R is as defined above. These diisocyanates are particularly useful as starting materials in the production of polyurethane plastics.

## Claims

### Claim 1

A mixture of homologues and isomers of diisocyanates corresponding to the formula: ##STR8## in which R represents a saturated, straight-chained aliphatic hydrocarbon radical having 8 to 15 carbon atoms prepared by
(a) dinitrating a mixture of homologues and isomers of hydrocarbons corresponding to the formula ##STR9## which mixture, at 1013 mbar, has a boiling range according to ASTM D 86 of 10.degree.-50.degree. C. within the temperature range of from 270.degree.-330.degree. C.;
(b) hydrogenating the product of (a) to form a mixture of diamino compounds; and
(c) phosgenating the diamino compounds of (b).

### Claim 2

A process for the production of polyurethane plastic materials by the polyaddition process in which an isocyanate and a polyhydroxyl compound are reacted wherein the isocyanate is a mixture of homologues and isomers of diisocyanates corresponding to the formula: ##STR10## in which R represents a saturated, straight-chained aliphatic hydrocarbon radical having 8 to 15 carbon atoms which mixture is prepared by nitrating, hydrogenating and phosgenating a mixture of alkylbenzenes having, at 1013 mbar, a boiling range according to ASTM D 86 of 10.degree.-50.degree. C. within the temperature range of from 270.degree.-330.degree. C.