Stabilized isocyanate compositions
US4152348A · kind A · utility
5Cited by
4References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1978 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Feb 22, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C263/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Color stabilized isocyanates, particularly methylene-bridged aromatic isocyanates [methylenebis(phenyl isocyanate) and prepolymers thereof], are derived by incorporating in the isocyanate a color stabilizing amount of a compound of the formula ##STR1## wherein R.sub.1 =alkyl, aryl; R.sub.2 =alkyl; R.sub.3 =H, alkyl or aralkyl; and R.sub.1 and R.sub.2 taken together represent the residue of an oxazoline or oxazine. 2-Ethyloxazoline is a preferred color stabilizing compound. The above compounds can also be used to discharge undesirable colors which have developed in such isocyanates on storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.