Patent US4885353A successfully refreshed from Google Patents.
US4885353A
Expired / Lapsed
US
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Liquid isocyanate prepolymers
Assignee: Bayer Corp
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Filing: 1988-11-16
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Granted: 1989-12-05
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Expires: 2008-11-16
Abstract
Abstract The present invention is directed to a liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 30% by weight, prepared by reacting (i) an isocyante selected from the group consisting of methylene bis(phenylisocyanates), polymethylene poly(phenylisocyanates), and mixtures thereof, 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
2026-11-04 08:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8054; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/5027; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/8006; C08G18/8038
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
A liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 30% by weight, prepared by reacting (i) an isocyanate selected from the group consisting of methylene bis(phenylisocyanates), polymethylene poly(phenylisocyanates), and mixtures thereof, 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, ##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
114 words
A liquid, storage-stable isocyanate prepolymer having an isocyanate group content of from 3 to 30% by weight, prepared by reacting (i) an isocyanate selected from the group consisting of methylene bis(phenylisocyanates), polymethylene poly(phenylisocyanates), and mixtures thereof, 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, ##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 25% by weight.
Claim 4
Dependent Claim
17 words
The prepolymer of claim 1 wherein R 1 represents hydrogen, m is 2 and X is --0--.
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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) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |