Low melting point diphenylethane diisocyanate mixtures, method of making the same, and polyurethanes made therefrom
US4595744A · kind A · utility
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5Claims
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Key dates
| Filing date | Dec 7, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Dec 7, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/7671
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Low melting point compositions, comprising a mixture of diisocyanate isomers having the diphenylethane structure, and containing by weight about: PA1 35 to 55% of 2,4' isomer, PA1 15 to 40% of 4,4' isomer, PA1 10 to 25% of 2,2' isomer, PA1 3 to 10% of 3,4' isomer, and PA1 3 to 8% of 2,3' isomer; to the method of making such compositions by the nitration of aromatic diphenylethane rings, followed by a hydrogenation and phosgenation; and polyurethanes formed utilizing such compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.