US4180644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane chain-extenders
Assignee: Huntsman Corp
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Filing: 1978-07-31
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Granted: 1979-12-25
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Expires: 1998-07-31
Abstract
Abstract Covers certain aromatic-amine amides which comprise the reaction product of an alkylene polyoxypropylene diamine, triamine, or tetramine and an isatoic anhydride of the formula: ##STR1## where R" is selected from the group consisting of hydrogen, alkyl, nitro, halo, hydroxy, amino, and cyano, and n is a number of 1-4. Also covers the use of said compounds as chain-extenders in polyurethane compositions. Such chain-extenders provide for the production of polyurethane elastomers having improved tensile strength, tear strength and elongation properties.
Inventors
- 👤 Edward T. Marquis
- 👤 Ernest L. Yeakey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5036; C08G18/5039; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3825
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
91 words
A polyurethane composition prepared by reacting an organic polyisocyanate with a polymeric polyhydroxy compound and a chain-extending agent having the following structural formula: ##STR12## where R" is selected from a group consisting of hydrogen, alkyl, nitro, halo, hydroxy, amine and cyano and n is a number of from 1 to 4, and R is --(CH.sub.2)--.sub.r or --(CH.sub.2)--.sub.r --O--(CH.sub.2).sub.s ].sub.z (CH.sub.2).sub.t where x and y are numbers from 1 to 10, r, s, and t, are numbers of from 1 to 6 and z is a number of from 4 to 50.
Claim 2
Dependent Claim
91 words
A polyurethane composition prepared by reacting an organic polyisocyanate with a polymeric polyhydroxy compound and a chain-extending agent having the following structural formula: ##STR12## where R" is selected from a group consisting of hydrogen, alkyl, nitro, halo, hydroxy, amine and cyano and n is a number of from 1 to 4, and R is --(CH.sub.2)--.sub.r or --(CH.sub.2)--.sub.r --O--(CH.sub.2).sub.s ].sub.z (CH.sub.2).sub.t where x and y are numbers from 1 to 10, r, s, and t, are numbers of from 1 to 6 and z is a number of from 4 to 50.
Claim 3
Dependent Claim
9 words
The polyurethane of claim 1 wherein R" is hydrogen.
References Cited (Backward Citations)
US4016143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |