US4056402A
Expired / Lapsed
US
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Dry water-dispersible pigment compositions
Assignee: Hercules LLC
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Filing: 1976-08-24
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Granted: 1977-11-01
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Expires: 1996-08-24
Abstract
Abstract Dry, non-dusting pigment compositions which are water-dispersible and which develop good strength and color values upon stirring in water-borne industrial finish systems are described. The pigment compositions contain 55 to 80% pigment and, by weight of the pigment, from 15 to 45% of certain nonionic dispersing agents and from 10 to 67% of at least one water-soluble cellulose ether which is nonionic in nature and has a viscosity of less than 1000 cps. as measured on a 2% aqueous solution at 25° C. The pigment compositions are preferably prepared by milling the pigment in water in the presence of the nonionic dispersing agent, mixing the milled pigment dispersion with the cellulose ether and then removing the water from the resulting mixture.
Inventors
- 👤 John Guzi, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:07
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0092; C09B67/0094; C09B67/006; C09D; C09D101/00; C09D101/08; C09D101/26; C09D17/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A dry, non-dusting, water-dispersible pigment composition developing upon stirring in water-borne industrial finish systems good strength and color values, said composition consisting essentially of from 55 to 80% of pigment and, based on the pigment weight, from 15 to 45% of a nonionic dispersing agent of the polyether alcohol type, alkylene oxide-alkylene diamine block polymer type or polyoxyethylene glycol or glycerol ester type and from 10 to 67% of at least one water-soluble, nonionic cellulose ether having a viscosity of less than 1000 cps. as measured on a 2% aqueous solution at 25° C.
Claim 2
Dependent Claim
94 words
A dry, non-dusting, water-dispersible pigment composition developing upon stirring in water-borne industrial finish systems good strength and color values, said composition consisting essentially of from 55 to 80% of pigment and, based on the pigment weight, from 15 to 45% of a nonionic dispersing agent of the polyether alcohol type, alkylene oxide-alkylene diamine block polymer type or polyoxyethylene glycol or glycerol ester type and from 10 to 67% of at least one water-soluble, nonionic cellulose ether having a viscosity of less than 1000 cps. as measured on a 2% aqueous solution at 25° C.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein the cellulose ether is hydroxyethyl cellulose having a viscosity less than 600 cps.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein the cellulose ether is hydroxypropyl cellulose having a viscosity less than 300 cps.
Claim 5
Dependent Claim
13 words
The composition of claim 3 wherein the dispersing agent is a polyether alcohol.
Claim 6
Dependent Claim
23 words
The composition of claim 4 wherein the pigment is present in an amount ranging from 60 to 70% by weight of the composition.
Claim 7
Dependent Claim
154 words
A process for preparing a dry, non-dusting, water-dispersible pigment composition developing upon stirring in water-borne industrial finish systems good strength and color values, said process consisting essentially of the steps of: forming a homogeneous mixture consisting essentially of milled or homogenized pigment, water, a nonionic dispersing agent of the polyether alcohol type, the alkylene oxide-alkylene diamine block polymer type or the polyoxyethylene glycol or glycerol ester type and at least one water-soluble, nonionic cellulose ether having a viscosity of less than 1000 cps. as measured on a 2% aqueous solution at 25° C.; and removing the water from said mixture until a dry composition is obtained, the amount of pigment, dispersing agent and cellulose ether being such as to provide a dry composition consisting essentially of from 55 to 80% of pigment, and, based on the pigment weight from 15 to 45% of the dispersing agent and 10 to 67% of the cellulose ether.
Claim 8
Dependent Claim
154 words
A process for preparing a dry, non-dusting, water-dispersible pigment composition developing upon stirring in water-borne industrial finish systems good strength and color values, said process consisting essentially of the steps of: forming a homogeneous mixture consisting essentially of milled or homogenized pigment, water, a nonionic dispersing agent of the polyether alcohol type, the alkylene oxide-alkylene diamine block polymer type or the polyoxyethylene glycol or glycerol ester type and at least one water-soluble, nonionic cellulose ether having a viscosity of less than 1000 cps. as measured on a 2% aqueous solution at 25° C.; and removing the water from said mixture until a dry composition is obtained, the amount of pigment, dispersing agent and cellulose ether being such as to provide a dry composition consisting essentially of from 55 to 80% of pigment, and, based on the pigment weight from 15 to 45% of the dispersing agent and 10 to 67% of the cellulose ether.
Claim 9
Dependent Claim
50 words
The process of claim 6 wherein the step of forming the homogeneous mixture comprises: milling or homogenizing the pigment in water in the presence of the nonionic dispersing agent to form an aqueous pigment dispersion; and mixing said pigment dispersion with the cellulose ether until a homogeneous mixture is formed.
Claim 10
Dependent Claim
15 words
The process of claim 7 wherein the water is removed by spray drying the mixture.
Claim 11
Dependent Claim
20 words
The process of claim 8 wherein the cellulose ether is hydroxyethyl cellulose having a viscosity of less than 600 cps.
Claim 12
Dependent Claim
20 words
The process of claim 8 wherein the cellulose ether is hydroxypropyl cellulose having a viscosity of less than 300 cps.
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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |