US5064927A
Expired / Lapsed
US
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Aromatic diamines
Assignee: Albemarle Corp
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Filing: 1990-10-03
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Granted: 1991-11-12
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Expires: 2010-10-03
Abstract
Abstract Novel aromatic diamines which are useful as chain extenders for urethane and urea polymers are compounds corresponding to the formula: ##STR1## wherein two of the R, R', and R" substituents are alkyl groups containing 1-6 carbons and the other substituent is a hydrocarbylthio group containing 1-6 carbons.
Inventors
- 👤 Robert L. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:39
CPC Classifications
C; C07; C07C; C07C323/00; C07C323/23; C07C323/31; C07C323/33; C07C323/35; C07C323/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A polymer prepared by reacting (1) an organic polyisocyanate and an active hydrogen-containing organic compound or (2) a prepolymer thereof having a free -NCO content of at least 0.1% by weight with (3) a chain extender corresponding to the formula: ##STR3## wherein two of the R, R', and R" substituents are alkyl groups containing 1-6 carbons and the other substituent is a hydrocarbylthio group containing 1-6 carbons.
Claim 2
Dependent Claim
67 words
A polymer prepared by reacting (1) an organic polyisocyanate and an active hydrogen-containing organic compound or (2) a prepolymer thereof having a free -NCO content of at least 0.1% by weight with (3) a chain extender corresponding to the formula: ##STR3## wherein two of the R, R', and R" substituents are alkyl groups containing 1-6 carbons and the other substituent is a hydrocarbylthio group containing 1-6 carbons.
Claim 3
Dependent Claim
9 words
The polymer of claim 1 which is a polyurethane.
Claim 4
Dependent Claim
9 words
The polymer of claim 1 which is a polyurea.
Claim 5
Dependent Claim
10 words
The polymer of claim 1 which is a urethane-urea polymer.
Claim 6
Dependent Claim
17 words
The polymer of claim 1 wherein the material reacted with the chain extender is a diphenylmethanediisocyanate prepolymer.
Claim 7
Dependent Claim
17 words
The polymer of claim 1 wherein the material reacted with the chain extender is a toluenediisocyanate prepolymer.
Claim 8
Dependent Claim
36 words
The polymer of claim 1 wherein two the the R, R' , and R" substituents in the chain extender are alkyl groups containing 1-3 carbons and the other substituents is an alkylthio group containing 1-3 carbons.
Claim 9
Dependent Claim
14 words
The polymer of claim 7 wherein the chain extender is a 2-alkylthio-4,6-dialkyl-1,3-diaminobenzene and/or 4-alkylthio-2,6-dialkyl-2,3-diaminobenzene.
References Cited (Backward Citations)
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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) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |