US3773697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing rapid-setting non-cellular polyurethanes
Assignee: Dow Chemical Co
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Filing: 1972-06-05
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Granted: 1973-11-20
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Expires: 1992-06-05
Abstract
Abstract Instant set polyurethane castings are prepared by mixing a polyol having a functionality of 2-8 and an equivalent weight of from 31 to 150, an organic polyisocyanate, an organo metallic catalyst, and a modifier which can be either a liquid or a solid or a mixture of both. The amount of modifier present is from 0-18 percent by weight of the combined weights of all the components of the system excluding the catalyst. This mixture is poured into a mold and then within 30 seconds after solidification, the resultant casting is quenched with a fluid at a temperature of from about 25*C down to about -100*C.
Inventors
- 👤 F Olstowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
19 words
The process of claim 1 wherein the equivalent weight of component (1) is from about 53 to about 130.
Claim 2
Dependent Claim
3 words
an organic polyisocyanate,
Claim 3
Dependent Claim
57 words
from about 0 to about 18 percent by weight based upon the combined weight of components (1), (2) and (3) of a compound selected from a. a liquid modifier compound having a boiling point of at least about 150*C, b. a solid modifier compound having a surface area less than about 0.1 m2/gram and c. mixtures thereof,
Claim 4
Dependent Claim
22 words
The process of claim 2 wherein component (1) has an average functionality of about 3 and component (2) is an organic diisocyanate.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein component (1) is the reaction product of glycerine with propylene oxide.
Claim 6
Dependent Claim
162 words
an organometallic catalyst, wherein the quantities of (1) and (2) are such as to provide an NCO:OH ratio of from about 0.8:1 to about 1.5:1 with the proviso that when the average functionality of components (1) or (2) is about 2, then the average functionality of the other component is at least about 2.5; with the further proviso that when component (1) consists solely of an amine initiated polyether polyol, no catalyst, component (4) is required; otherwise, component (4) is employed in quantities of from about 0.01 to about 2 percent by weight of the combined weights of components (1), (2) and (3); B. rapidly pouring the mixture into a suitable mold whereupon the composition rapidly solidifies, and C. quenching the solidified composition within less than about 30 seconds after solidification has occurred by contacting the solidified composition or the mold containing the solidified composition with a cooling fluid for a time sufficient to prevent undesired swelling and/or distortion of the casting.
Claim 7
Dependent Claim
17 words
The process of claim 3 wherein component (1) is the reaction product of glycerine with ethylene oxide.
Claim 8
Dependent Claim
10 words
The process of claim 3 wherein the polyisocyanate is toluenediisocyanate.
Claim 9
Dependent Claim
11 words
The process of claim 3 wherein the quenching agent is water.
Claim 10
Dependent Claim
12 words
The process of claim 3 wherein the quenching agent is methylene chloride.
Claim 11
Dependent Claim
11 words
The process of claim 3 wherein the quenching agent is air.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |