Patent US4431754A successfully refreshed from Google Patents.
US4431754A
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Low viscosity polymer polyols via dilution
Assignee: Dow Chemical Co
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Filing: 1982-03-01
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Granted: 1984-02-14
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Expires: 2002-03-01
Abstract
Abstract A low viscosity copolymer polyahl dispersion is prepared by polymerizing polymer particles in a polyahl medium, to a first solids concentration and thereafter diluting the dispersion to a second lower solids concentration. The resulting diluted dispersion has a lower viscosity than if the dispersion were prepared directly at the lower solids level. The invention has particular advantage when used with "all acrylonitrile" dispersions. The copolymer polyahl dispersions are useful in the manufacture of urethane and isocyanurate foams.
Inventors
- 👤 Dwight K. Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:34
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/63; C08G18/635; C08F; C08F283/00; C08G2115/00; C08G2115/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
A method of making a polymer dispersion in a polyahl comprising (a) a first step of addition polymerizing monomer to form polymer particles in a polyahl medium to a first solids concentration; and (b) a second step of diluting, the dispersion obtained in step (a) with a polyahl to a second lower solids concentration, thereby obtaining a dispersion having a lower viscosity than if the polymer dispersion were prepared directly to said second solids concentration.
Claim 2
Independent Claim
75 words
A method of making a polymer dispersion in a polyahl comprising (a) a first step of addition polymerizing monomer to form polymer particles in a polyahl medium to a first solids concentration; and (b) a second step of diluting, the dispersion obtained in step (a) with a polyahl to a second lower solids concentration, thereby obtaining a dispersion having a lower viscosity than if the polymer dispersion were prepared directly to said second solids concentration.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the polymer particles are polymerized from acrylonitrile, styrene, or a mixture of acrylonitrile and styrene.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the polymer particles are prepared from acrylonitrile, a vinyl halide, a vinylidene halide, or mixtures thereof.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein the polymer particles are formed from acrylonitrile.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the polyahl is a polyol.
Claim 7
Dependent Claim
11 words
The method of claim 4 wherein the polyahl is a polyol.
Claim 8
Dependent Claim
11 words
The method of claim 1 wherein the polyahl contains added unsaturation.
Claim 9
Dependent Claim
21 words
The method of claim 7 wherein the polyahl is reacted with a reactive compound before the polymerization of the polymer particles.
Claim 10
Dependent Claim
41 words
The method of claim 7 wherein the polymer particles are polymerized from a reactive compound and at least one other addition polymerizable compound and the polymer particles are then reacted with the polyahl through the reactive moiety of the reactive compound.
Claim 11
Dependent Claim
20 words
The method of claim 1 wherein the dispersion is prepared to an initial solids of at least 25 weight percent.
Claim 12
Dependent Claim
24 words
The method of claim 1 wherein the dilution reduces the solids of the dispersion to less than 80 weight percent of its original solids.
Claim 13
Dependent Claim
23 words
The method of claim 1 wherein the dilution reduces the viscosity of the dispersion to less than 60 percent of its original viscosity.
Claim 14
Dependent Claim
49 words
The method of claim 6 wherein the dispersion is prepared to an initial solids of at least 25 weight percent, and the dilution reduces the solids to less than 80 weight percent of the original solids and reduces the viscosity to less than 60 percent of the original viscosity.
Claim 15
Dependent Claim
23 words
A polymer dispersion prepared by the method of claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13.
Claim 16
Dependent Claim
21 words
A urethane-type composition obtained from the reaction of a diisocyanate and the polymer dispersion produced by the method of claim 1.
Claim 17
Dependent Claim
15 words
An isocyanurate foam prepared from the polymer dispersion produced by the method of claim 1.
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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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |