Dichloroparabanic acid stabilized diphenylmethane diisocyanate-polymethylene polyphenyl isocyanate compositions
US4332741A · kind A · utility
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Key dates
| Filing date | Mar 23, 1981 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Mar 23, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/7671
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Liquid reaction product mixtures of diphenylmethane diisocyanates and polymethylene polyphenyl isocyanates resulting from the thermal decomposition of the corresponding carbamates produced by the acid condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with formaldehyde are storage stabilized against an increase in viscosity and decrease in free NCO content, by incorporating therein an effective amount of a dichloroparabanic acid compound having the formula ##STR1## wherein R is an alkyl group of from 1 to 4 carbon atoms or a phenyl group which may be substituted with a 1 to 4 carbon atom alkyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.