US4169175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of unreacted tolylene diisocyanate from urethane prepolymers
Assignee: WR Grace and Co
•
Filing: 1977-10-11
•
Granted: 1979-09-25
•
Expires: 1997-10-11
Abstract
Abstract Disclosed herein are improved urethane prepolymers comprising the reaction product of a polyol with a monomeric isocyanate. The amount of residual unreacted monomeric isocyanate in said prepolymer is less than about 0.7% by weight of said prepolymer.
Inventors
- 👤 Nelson S. Marans
- 👤 Alfred Gluecksmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
59 words
A composition comprising an isocyanate capped urethane prepolymer and less than about 0.7% by weight of said prepolymer of residual unreacted monomeric polyisocyanate said composition formed by reacting a polyol with a monomeric polyisocyanate and passing the resultant reaction mixture through a column containing absorbent type X zeolite molecular sieves at a temperature of about 20° to 100° C.
Claim 2
Dependent Claim
59 words
A composition comprising an isocyanate capped urethane prepolymer and less than about 0.7% by weight of said prepolymer of residual unreacted monomeric polyisocyanate said composition formed by reacting a polyol with a monomeric polyisocyanate and passing the resultant reaction mixture through a column containing absorbent type X zeolite molecular sieves at a temperature of about 20° to 100° C.
Claim 3
Dependent Claim
24 words
A prepolymer as in claim 1 wherein the polyol is a polyoxyalkylene polyol with a molecular weight of from about 200 to about 20,000.
Claim 4
Dependent Claim
18 words
A prepolymer as in claim 2 wherein at least 40 mole percent of the oxyalkylene units are oxyethylene.
Claim 5
Dependent Claim
25 words
A prepolymer as in claim 2 wherein the polyol is a polyoxyalkylene glycol wherein at least 40 mole percent of the oxyalkylene units are oxyethylene.
Claim 6
Dependent Claim
27 words
A prepolymer as in claim 2 wherein the polyol is an admixture of a polyoxyalkylene glycol and a monomeric alcohol containing from 3 to 8 hydroxyl groups/mole.
Claim 7
Dependent Claim
20 words
A prepolymer as in claim 5 wherein the mole ratio of glycol/monomeric alcohol is from about 3:1 to about 2:1.
Claim 8
Dependent Claim
14 words
A prepolymer as in claim 6 wherein the monomeric alcohol has 3 hydroxyl groups/mole.
Claim 9
Dependent Claim
13 words
A prepolymer as in claim 2 wherein the monomeric isocyanate is toluene diisocyanate.
Claim 10
Dependent Claim
13 words
A prepolymer as in claim 3 wherein the monomeric isocyanate is toluene diisocyanate.
Claim 11
Dependent Claim
13 words
A prepolymer as in claim 4 wherein the monomeric isocyanate is toluene diisocyanate.
Claim 12
Dependent Claim
13 words
A prepolymer as in claim 5 wherein the monomeric isocyanate is toluene diisocyanate.
Claim 13
Dependent Claim
13 words
A prepolymer as in claim 6 wherein the monomeric isocyanate is toluene diisocyanate.
Claim 14
Dependent Claim
13 words
A prepolymer as in claim 7 wherein the monomeric isocyanate is toluene diisocyanate.
Claim 15
Dependent Claim
23 words
A prepolymer as in claim 5 wherein the NCO/OH stoichiometric ratio employed in forming the prepolymer is from about 1.9 to about 2.3.
Claim 16
Dependent Claim
23 words
A prepolymer as in claim 6 wherein the NCO/OH stoichiometric ratio employed in forming the prepolymer is from about 1.9 to about 2.3.
Claim 17
Dependent Claim
23 words
A prepolymer as in claim 7 wherein the NCO/OH stoichiometric ratio employed in forming the prepolymer is from about 1.9 to about 2.3.
Claim 18
Dependent Claim
23 words
A prepolymer as in claim 8 wherein the NCO/OH stoichiometric ratio employed in forming the prepolymer is from about 1.9 to about 2.3.
Claim 19
Dependent Claim
13 words
A prepolymer as in claim 1 wherein the monomeric isocyanate is xylylene diisocyanate.
Claim 20
Dependent Claim
12 words
A prepolymer as in claim 1 wherein the monomeric isocyanate is bis(4-isocyanatophenyl)methane.
Claim 21
Dependent Claim
24 words
A prepolymer as in claim 1 wherein the polyol is a polyester polyol having a molecular weight of from about 200 to about 20,000.
References Cited (Backward Citations)
US3415790A
Cited
US3878157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |