Patent US4359571A successfully refreshed from Google Patents.
US4359571A
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Process for preparing graft polymer dispersions and polyurethanes prepared therefrom
Assignee: BAS WYANDOTTE Corp
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Filing: 1981-09-02
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Granted: 1982-11-16
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Expires: 2001-09-02
Abstract
Abstract The present invention relates to a process for the preparation of stable graft polymer dispersions having improved dispersibility by a free radical polymerization of an ethylenically unsaturated monomer under conditions of no-reflux or alternatively under conditions that do not return the evaporated monomer to the dispersion. Polyurethane foams may be prepared from these polymer dispersions.
Inventors
- 👤 William A. Bernstein
- 👤 John E. Davis
- 👤 Joseph R. Gregoria, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:33
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/06; C08F291/08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/63
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
In the process for the preparation of a graft polyol dispersion bythe in situ free radical polymerization of an ethylenically unsaturated monomer or monomers, selected from the group consisting of acrylonitrile, styrene and mixtures thereof, in the presence of a free radical initiator, in a polyol, the improvement comprising conducting said polymerization under such conditions that none of the evaporated monomer or monomers is returned to the dispersion wherein said polymerization is conducted at temperatures between 80° C. and 180° C.
Claim 2
Dependent Claim
81 words
In the process for the preparation of a graft polyol dispersion bythe in situ free radical polymerization of an ethylenically unsaturated monomer or monomers, selected from the group consisting of acrylonitrile, styrene and mixtures thereof, in the presence of a free radical initiator, in a polyol, the improvement comprising conducting said polymerization under such conditions that none of the evaporated monomer or monomers is returned to the dispersion wherein said polymerization is conducted at temperatures between 80° C. and 180° C.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the amount of said unsaturated monomer is from 1 percent to 60 percent based on the total weight of the product.
Claim 4
Dependent Claim
63 words
In the process for the preparation of a graft polymer dispersion in a polyol by the in situ free radical polymerization of an ethylenically unsaturated monomer or monomers selected from the group consisting of acrylonitrile, styrene and mixtures thereof, in a polyol, the improvement comprising conducting said polymerization without reflux of said monomer or monomers at temperatures between 80° C. and 180° C.
Claim 5
Dependent Claim
63 words
In the process for the preparation of a graft polymer dispersion in a polyol by the in situ free radical polymerization of an ethylenically unsaturated monomer or monomers selected from the group consisting of acrylonitrile, styrene and mixtures thereof, in a polyol, the improvement comprising conducting said polymerization without reflux of said monomer or monomers at temperatures between 80° C. and 180° C.
Claim 6
Dependent Claim
27 words
The process of claim 3 wherein the amount of said unsaturated monomer is from 1 percent to 60 percent based on the total weight of the product.
Claim 7
Dependent Claim
16 words
The process of claim 3 wherein said polymerization is conducted under pressure of an inert gas.
Claim 8
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 9
Dependent Claim
9 words
The product produced by the process of claim 3.
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) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |