US4235765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane elastomers having reduced thixotropy and viscosity
Assignee: BASF Corp
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Filing: 1979-01-04
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Granted: 1980-11-25
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Expires: 1999-01-04
Abstract
Abstract Polyurethane elastomers having nearly Newtonian flow characteristics and having reduced thixotropy are provided by admixing with a pigmented polyol a minor amount of a sodium alkyl sulfate. The polyurethanes hereof are employed as surface coatings for athletic arenas, such as gymnasiums and the like.
Inventors
- 👤 James A. Gallagher
- 👤 Bernard A. Merkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:17
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K3/00; C08K3/01; C08K3/013; C08K5/0008; C08K5/0041
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
47 words
In an essentially solvent-free pigmented polyurethane elastomer composition of the type comprising on organic polyisocyanate, an active hydrogen-containing compound, a pigment and a catalyst, the improvement which comprises: a minor amount of a sodium alkyl sulfate, the sulfate reducing the thixotropy and viscosity of the elastomer composition.
Claim 2
Dependent Claim
47 words
In an essentially solvent-free pigmented polyurethane elastomer composition of the type comprising on organic polyisocyanate, an active hydrogen-containing compound, a pigment and a catalyst, the improvement which comprises: a minor amount of a sodium alkyl sulfate, the sulfate reducing the thixotropy and viscosity of the elastomer composition.
Claim 3
Dependent Claim
20 words
The improvement of claim 1 wherein: the sulfate contains from about six to twenty carbon atoms in the alkyl portion.
Claim 4
Dependent Claim
12 words
The improvement of claim 1 wherein: the sulfate is sodium lauryl sulfate.
Claim 5
Dependent Claim
31 words
The improvement of claim 1 wherein: the sulfate is present in an amount ranging from about 0.01 to about 0.50 percent, by weight, based on the total weight of the dispersion.
Claim 6
Dependent Claim
31 words
The improvement of claim 4 wherein: the sulfate is present in an amount ranging from about 0.025 to about 0.20 percent, by weight, based on the total weight of the dispersion.
Claim 7
Independent Claim
28 words
A method for reducing the viscosity and thixotropy of an essentially solvent-free pigmented polyurethane elastomer, comprising: adding to the elastomer a minor amount of a sodium alkyl sulfate.
Claim 8
Independent Claim
28 words
A method for reducing the viscosity and thixotropy of an essentially solvent-free pigmented polyurethane elastomer, comprising: adding to the elastomer a minor amount of a sodium alkyl sulfate.
Claim 9
Dependent Claim
40 words
The method of claim 6 wherein: the elastomer is prepared by reacting an active hydrogen-containing compound with an organic polyisocyanate, the sulfate and the pigment being blended with the active hydrogen-containing compound prior to the reaction thereof with the polyisocyanate.
Claim 10
Dependent Claim
15 words
The method of claim 7 wherein: the active hydrogen containing compound is a polyether polyol.
Claim 11
Dependent Claim
21 words
The method of claim 7 wherein: the sulfate contains from about six to twenty carbon atoms in the alkyl portion thereof.
Claim 12
Dependent Claim
31 words
The method of claim 7 wherein: the sulfate is present in an amount ranging from about 0.01 to about 0.50 percent, by weight, based on the total weight of the dispersion.
Claim 13
Dependent Claim
12 words
The method of claim 7 wherein: the sulfate is sodium lauryl sulfate.
Claim 14
Dependent Claim
11 words
A coating for athletic surfaces comprising: the improvement of claim 1.
Claim 15
Dependent Claim
12 words
The coating of claim 12 wherein: the sulfate is sodium lauryl sulfate.
Claim 16
Dependent Claim
31 words
The coating of claim 12 wherein: the sulfate is present in an amount ranging from about 0.01 to about 0.50 percent, by weight, based on the total weight of the dispersion.
References Cited (Backward Citations)
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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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |