Patent US3839284A successfully refreshed from Google Patents.
US3839284A
Expired / Lapsed
US
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Polyurethanes prepared from 2,3,5,6-tetramethyl-p-xylylene diisocyanate
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-07-02
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Granted: 1974-10-01
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Expires: 1993-07-02
Abstract
Abstract Disclosure of preparation of novel diisocyanates and polyurethanes (particularly polyester- and polyether-urethane elastomers) prepared therefrom.
Inventors
- 👤 A Mohajer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:04
CPC Classifications
C; C07; C07C; C07C265/00; C07C17/00; C07C17/26; C07C17/32; C07C209/00; C07C209/44; C07C209/48; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/65; C08G18/66; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7628
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A SEGMENTED POLYESTER- OR POLYETHER-URETHANE PREPARED FROM REACTION BETWEEN THE FOLLOWING REACTANTS: THE HYDROXYENDED (CO)POLYESTER OR (CO)POLYESTER HAVING A MOLECULAR WEIGHT IN THE RANGE 1,500 TO 5,000 AND A GLASS TRANSITION TEMPERATURE BELOW ROOM TEMPERATURE, 2,3,5,6-TETRAMETHYL PXYLYLENE-DIISOCYANATE AND OF ONE OF THE DIOLS: P-BIS(BHYDROXYETHOXY BENZENE, ETHYLENE GLYCOL, 2,3,5,6-TETRAMETHYL P-XYLYLENE GLYCOLS OR TRANSCYCLOHEXANE 1,4 DIOL, THE MOLAR PROPORTIONS OF SAID REACTANTS LYING IN THE RANGE (CO)POLYESTER OR (CO) POLYETHER (1-X) DIOL X 2,3,5,6-TETRAMETHYL P-XYLYLENEDIISOCYANATE 0.98 TO 1.08 WHERE X/1-X LIES IN THE RANGE 0.2 TO 1.
Claim 2
Dependent Claim
85 words
A SEGMENTED POLYESTER- OR POLYETHER-URETHANE PREPARED FROM REACTION BETWEEN THE FOLLOWING REACTANTS: THE HYDROXYENDED (CO)POLYESTER OR (CO)POLYESTER HAVING A MOLECULAR WEIGHT IN THE RANGE 1,500 TO 5,000 AND A GLASS TRANSITION TEMPERATURE BELOW ROOM TEMPERATURE, 2,3,5,6-TETRAMETHYL PXYLYLENE-DIISOCYANATE AND OF ONE OF THE DIOLS: P-BIS(BHYDROXYETHOXY BENZENE, ETHYLENE GLYCOL, 2,3,5,6-TETRAMETHYL P-XYLYLENE GLYCOLS OR TRANSCYCLOHEXANE 1,4 DIOL, THE MOLAR PROPORTIONS OF SAID REACTANTS LYING IN THE RANGE (CO)POLYESTER OR (CO) POLYETHER (1-X) DIOL X 2,3,5,6-TETRAMETHYL P-XYLYLENEDIISOCYANATE 0.98 TO 1.08 WHERE X/1-X LIES IN THE RANGE 0.2 TO 1.
Claim 3
Dependent Claim
9 words
Filaments produced from polymers as claimed in claim 1.
Claim 4
Dependent Claim
9 words
Yarns produced from polymers as claimed in claim 1.
Claim 5
Dependent Claim
9 words
Films produced from polymers as claimed in claim 1.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |