Liquid diphenylmethane diisocyanate compositions
US4539158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1984 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Dec 14, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C263/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to a process for the preparation of a stable, liquid adduct comprising reacting a mixture of 1,3-butane diol and neopentyl glycol with diphenylmethane diisocyanate at a temperature of from about 25.degree. C. to about 120.degree. C. in an amount such that said adduct has an isocyanate group content of from about 20 to about 30 percent by weight, and wherein the ratio of mole equivalents of 1,3-butane diol to mole equivalents of neopentyl glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that PA1 (i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is equal to or greater than 98 percent by weight, then said ratio is from 0.30:0.70 to 0.65:0.35, PA1 (ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 98 percent by weight but not less than 90 percent by weight, then said ratio is from 0.30:0.70 to 0.75:0.25, PA1 (iii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 90 percent by weight but not less than 80 percent by weight, then said ratio is from 0.30:0.70 to 0.85:0.15 and PA1 (iv) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 80 percen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.