US4914174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid isocyanate prepolymers
Assignee: Bayer Corp
•
Filing: 1989-01-23
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Granted: 1990-04-03
•
Expires: 2009-01-23
Abstract
Abstract The present invention is directed to a liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 45% by weight, prepared by reacting (i) toluene diisocyanate and (ii) a polyamine of the structure <IMAGE> where R represents an m-valent residue obtained by the removal of m functional groups from a compound having m functional groups and having a molecular weight of from 76 to about 10,000, X represents <IMAGE> R1 represents hydrogen or an inert substituent, R2 represents hydrogen, a C1 to C5 alkyl group or a phenyl group, n is 1 or 2, and m is an integer of from 2 to 8.
Inventors
- 👤 William E. Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:43
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/5027; C08G18/5036; C08G18/5039; C08G18/5072; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621; C08G18/7657; C08G18/7664; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8038; C08G18/8054
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 45% by weight, prepared by reacting (i) toluene diisocyanate and (ii) a polyamine of the structure ##STR9## where R represents an m-valent residue obtained by the removal of m functional groups from a compound having m functional groups and having a molecular weight of from 76 to about 10,000, X represents ##STR10## R 1 represents hydrogen or an inert substituent, R 2 represents hydrogen, a C 1 to C 5 alkyl group or a phenyl group, n is 1 or 2, and m is an integer of from 2 to 8.
Claim 2
Dependent Claim
105 words
A liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 45% by weight, prepared by reacting (i) toluene diisocyanate and (ii) a polyamine of the structure ##STR9## where R represents an m-valent residue obtained by the removal of m functional groups from a compound having m functional groups and having a molecular weight of from 76 to about 10,000, X represents ##STR10## R 1 represents hydrogen or an inert substituent, R 2 represents hydrogen, a C 1 to C 5 alkyl group or a phenyl group, n is 1 or 2, and m is an integer of from 2 to 8.
Claim 3
Dependent Claim
17 words
The prepolymer of claim 1 having an isocyanate group content of from 14 to 35% by weight.
Claim 4
Dependent Claim
17 words
The prepolymer of claim 1 wherein R 1 represents hydrogen, m is 2 and X is --O--.
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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) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |