Patent US4145510A successfully refreshed from Google Patents.
US4145510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-Substituted phosphonate hydantoins and derivatives thereof
Assignee: BASF Corp
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Filing: 1978-03-09
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Granted: 1979-03-20
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Expires: 1998-03-09
Abstract
Abstract Hydantoins of the formula ##STR1## wherein R 1 is hydrogen or alkyl of 1 to 8 carbon atoms, R 2 is ##STR2## R 3 is alkyl of 1 to 8 carbon atoms, and X is a straight or branched chain alkylene of 1 to 4 carbon atoms or a straight or branched chain alkylene of 3 to 6 carbon atoms containing an internal carbamido group; or R 1 and R 2 together are Y where Y is a straight or branched chain alkylene of 4 to 8 carbon atoms having a pendant ##STR3## ARE PREPARED BY REACTING FIRST α,β-UNSATURATED ALDEHYDES OR KETONES WITH ALKYL PHOSPHITES TO FORM A PHOSPHONATE ALDEHYDE OR KETONE FOLLOWED BY A CLASSICAL Bucherer hydantoin synthesis.
Inventors
- 👤 Luther A. R. Hall
- 👤 David A. Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:37
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/645; C07F9/6503; C07F9/6506
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A flame resistant polyurethane having the unit structural formula V ##STR25## wherein R 1 is hydrogen or alkyl of 1 to 8 carbon atoms, R 2 is ##STR26## R 3 is alkyl of 1 to 8 carbon atoms, X is a straight or branched chain alkylene of 1 to 4 carbon atoms or a straight or branched chain alkylene of 3 to 6 carbon atoms containing an internal carbamido group, or R 1 and R 2 together are Y where Y is a straight or branched chain alkylene of 4 to 8 carbon atoms having a pendant ##STR27## R 4 is hydrogen, methyl or ethyl, and Z is alkylene of 4 to 10 carbon atoms, phenylene, tolylene, xylylene --C 6 H 4 CH 2 C 6 H 4 -- or --C 6 H 10 CH 2 C 6 H 10 --.
Claim 2
Dependent Claim
141 words
A flame resistant polyurethane having the unit structural formula V ##STR25## wherein R 1 is hydrogen or alkyl of 1 to 8 carbon atoms, R 2 is ##STR26## R 3 is alkyl of 1 to 8 carbon atoms, X is a straight or branched chain alkylene of 1 to 4 carbon atoms or a straight or branched chain alkylene of 3 to 6 carbon atoms containing an internal carbamido group, or R 1 and R 2 together are Y where Y is a straight or branched chain alkylene of 4 to 8 carbon atoms having a pendant ##STR27## R 4 is hydrogen, methyl or ethyl, and Z is alkylene of 4 to 10 carbon atoms, phenylene, tolylene, xylylene --C 6 H 4 CH 2 C 6 H 4 -- or --C 6 H 10 CH 2 C 6 H 10 --.
Claim 3
Dependent Claim
97 words
A polyurethane according to claim 1 wherein R 1 is hydrogen, methyl or ethyl, R 2 is ##STR28## R 3 is methyl or ethyl, X is ethylene, --C(CH 3 ) 2 CH 2 or --CH 2 CH 2 CONHC(CH 3 ) 2 CH 2 --, or R 1 and R 2 together are Y where Y is ##STR29## R 4 is hydrogen, and Z is alkylene of 4 to 6 carbon atoms, tolylene, xylylene, --C 6 H 4 CH 2 C 6 H 4 -- or --C 6 H 10 CH 2 C 6 H 10 --.
Claim 4
Dependent Claim
71 words
A polyurethane according to claim 1 wherein R 1 is hydrogen or methyl, R 2 is ##STR30## R 3 is ethyl, X is ethylene or --C(CH 3 ) 2 CH 2 --, or R 1 and R 2 together are ##STR31## R 4 is hydrogen, and Z is --C 6 H 4 CH 2 C 6 H 4 -- or --C 6 H 10 CH 2 C 6 H 10 --.
Claim 5
Dependent Claim
58 words
A polyurethane according to claim 1 wherein R 1 is methyl, R 2 is ##STR32## R 3 is ethyl, X is --C(CH 3 ) 2 CH 2 --, R 4 is hydrogen and Z is --C 6 H 4 CH 2 C 6 H 4 -- or --C 6 H 10 CH 2 C 6 H 10 --.
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |