US3774887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for mixing coreactive liquids which forms polyurethanes
Assignee: Milacron Inc
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Filing: 1972-01-27
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Granted: 1973-11-27
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Expires: 1992-01-27
Abstract
Abstract A process and apparatus for intimately mixing two or more mutually coreactive liquids such as polyols and polyisocyanates comprising: A. passing the liquids, while in a substantially unmixed state, through a plurality of very small holes such as that provided by a screen, and immediately thereafter B. subjecting the liquids to a high shear. The present process and apparatus find particular utility in the production of high density, foamed polyurethane moldings.
Inventors
- 👤 D Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:35
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/27; B01F27/272; B01F27/2722; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/401; B29B7/405; B29B7/407; B01F25/00; B01F2025/91; B01F2025/911; B01F27/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
27 words
The apparatus of claim 1 wherein said rotor is separated from the inside surface of said cylindrical chamber by a distance of from 0.01 to 0.20 inches.
Claim 2
Dependent Claim
48 words
a portion for imparting high shear to the liquids coming between said rotor and the wall of the chamber; c. a means for separately and simultaneously passing a plurality of liquids into the hollow portion of the rotor; and d. a means for causing rotation of the rotor.
Claim 3
Independent Claim
163 words
An apparatus for intimately mixing at least two mutually coreactive liquids comprising a. a stationary cylindrical housing having a cylindrical chamber therein and being open at both ends, b. a cylindrical rotor rotatably mounted within said chamber in close proximity to the wall of said chamber and having (1) a cylindrical hollow portion defined by a wall normal to the diameter of said hollow portion which contains a plurality of passageways extending from the inside surface to the outside surface of said wall and (2) a portion for imparting high shear to the liquids coming between said rotor and the wall of the chamber, c. a cylindrical screen of 20 to 400 mesh per inch disposed within said hollow portion of said rotor, in contact with the wall defining the hollow portion of said rotor, d. a means of separately and simultaneously passing a plurality of liquids into the hollow portion of the rotor, e. a means for causing rotation of the rotor.
Claim 4
Dependent Claim
27 words
The apparatus of claim 3 wherein said rotor is separated from the inside surface of said cylindrical chamber by a distance of from 0.01 to 0.20 inches.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |