Patent US3567692A successfully refreshed from Google Patents.
US3567692A
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Polymeric materials produced by interacting polyisocyanate and water in the presence of polyaldimine or polyketimine
Assignee: Imperial Chemical Industries Ltd
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Filing: 1968-03-26
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Granted: 1971-03-02
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Expires: 1988-03-26
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF SIOCYANATE-BASED POLYMERS WHICH COMPRISES INTERACTING AT LEAST ONE ORGANIC POLYISOCYANATE AND WATER IN THE PRESENCE OF A STERICALLY HINDERED BISALDIMINE OR BISKETIMINE DERIVED FROM AN AMINE CONTAINING TWO PRIMARY AMINO GROUPS. THE SOLUTIONS OF ISOCYANATES CONTAINING SUCH BISALDIMINES OR BISKETIMINES ARE SIGNIFICANTLY MORE STABLE THAN SIMILAR SOLUTIONS CONTAINING OTHER ALDIMINES OR KETIMINES. THIS INCREASED STABILITY IS OBTAINED WITHOUT ANY SIGNIFICANT DECREASE IN THE SPEED OF POLYMER FORMATION IN PRESENCE OF WATER OR LOSS OF DESIRABLE PROPERTIES IN THE POLYMERS, FOR EXAMPLE, SURFACE COATINGS, SO OBTAINED.
Inventors
- 👤 Geoffrey Arthur Haggis
- 👤 Ronald Wynford Kenyon
- 👤 Vincent Kerrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/302; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3256; C08G18/3271; C08G18/3296; C08G2110/00; C08G2110/0008; C08G2110/0025; C08G2110/0083; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |