US4148844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization products containing polycarbodiimides and vinyl monomers
Assignee: Bayer AG
•
Filing: 1977-05-24
•
Granted: 1979-04-10
•
Expires: 1997-05-24
Abstract
Abstract Heat-curable casting resins comprising a mixture of a polycarbodiimide and a copolymerizable vinyl monomer.
Inventors
- 👤 Wulf von Bonin
- 👤 Lothar Preis
- 👤 Ulrich VON Gizycki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:17
CPC Classifications
C; C08; C08F; C08F283/00; C08G; C08G18/00; C08G18/02; C08G18/025; C08G18/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A casting resin comprising a mixture of (A) a polycarbodiimide having a molecular weight above 300, containing at least two carbodiimide groups per molecule and prepared by intermolecular elimination of carbon dioxide from a polyfunctional isocyanate and (B) 0.5 to 70% by weight, based on the weight of the mixture, of a monomer selected from the group consisting of styrene, diallylphthalate, and a mixture of styrene and divinyl benzene.
Claim 2
Dependent Claim
69 words
A casting resin comprising a mixture of (A) a polycarbodiimide having a molecular weight above 300, containing at least two carbodiimide groups per molecule and prepared by intermolecular elimination of carbon dioxide from a polyfunctional isocyanate and (B) 0.5 to 70% by weight, based on the weight of the mixture, of a monomer selected from the group consisting of styrene, diallylphthalate, and a mixture of styrene and divinyl benzene.
Claim 3
Dependent Claim
29 words
The casting resin of claim 1 wherein said polyfunctional isocyanate is selected from the group consisting of hexamethylene diisocyanate, diphenylmethane disocyanate, isophorone diisocyanate and at least one toluylene diisocyanate.
Claim 4
Dependent Claim
14 words
The casting resin of claim 1 which additionally contains a free radical forming initiator.
Claim 5
Dependent Claim
14 words
The casting resin of claim 3 which additionally contains a compound containing hydrolyzable halogen.
Claim 6
Dependent Claim
14 words
The casting resin of claim 1 which additionally contains a compound containing hydrolyzable halogen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |