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Patent US3960950A successfully refreshed from Google Patents.
US3960950A
Expired / Lapsed
US
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Process for carbodiiomide synthesis
Assignee: 3M Co
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Filing: 1974-09-09
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Granted: 1976-06-01
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Expires: 1994-09-09
Abstract
Abstract Phosphine oxides are prepared from terpenes and are found to be valuable as catalysts in the condensation of isocyanates to yield carbodiimides.
Inventors
- 👤 Robert L. Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:26
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
In the process for the formation of organic carbodiimides from organic mono- or di-isocyanates or mixtures thereof with each other or with up to one organic tri-isocyanate per average molecule of organic carbodiimide formed, said organic mono-, di- and tri-isocyanates having no active hydrogen-containing substituents which are reactive with isocyanate groups, the step comprising treating each 100 parts by weight of said organic isocyanates with from about 0.01 to 10.0 parts by weight of bicyclic terpene alkyl or hydrocarbyl aryl phosphine oxide wherein alkyl is of 1 to 10 carbon atoms and hydrocarbyl aryl is of 6 to 10 carbon atoms.
Claim 2
Dependent Claim
101 words
In the process for the formation of organic carbodiimides from organic mono- or di-isocyanates or mixtures thereof with each other or with up to one organic tri-isocyanate per average molecule of organic carbodiimide formed, said organic mono-, di- and tri-isocyanates having no active hydrogen-containing substituents which are reactive with isocyanate groups, the step comprising treating each 100 parts by weight of said organic isocyanates with from about 0.01 to 10.0 parts by weight of bicyclic terpene alkyl or hydrocarbyl aryl phosphine oxide wherein alkyl is of 1 to 10 carbon atoms and hydrocarbyl aryl is of 6 to 10 carbon atoms.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein camphene alkyl or hydrocarbyl aryl phosphine oxide is used.
Claim 4
Dependent Claim
14 words
The process according to claim 1 wherein beta pinene phenyl phosphine oxide is used.
References Cited (Backward Citations)
US3152131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |