Liquid composition containing diisocyanate of diphenylurethane
US4650899A · kind A · utility
4Cited by
4References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1984 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Apr 26, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/7671
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A liquid composition comprising a mixture of isomers of essentially diisocyanates having the diphenylmethane structure, the distribution by weight of isomers in the composition for each 100 parts by weight of the composition being: PA0 32 to 55% of the 4,4' isomer, PA0 30 to 45% of the 2,4' isomer, PA0 5 to 12% of the 3,4' isomer, PA0 4 to 10% of the 2,2' isomer, and PA0 2 to 5% of the 2,3' isomer; and the method of making the composition by first reacting a benzyl halide with benzene, followed by nitration, hydrogenation, and phosgenation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.