USH564H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigment milling process
Assignee: BASF Corp
•
Filing: 1986-04-28
•
Granted: 1989-01-03
•
Expires: 2006-04-28
Abstract
Abstract Aqueous pigment concentrates are produced by a two-step milling process. The process comprises a. pumping a crude with from about 12% to about 48% by weight of surfactant, based on pigment, and an amount of water sufficient to reduce the crude concentration to 10 to 50% by weight, based on the total mixture, and b. continuously pumping the blend of (a) through at least two shot mills in series containing between 50 and 90% by volume of a grinding media that has a size in the range of 0.1 to 1.5 mm diameter and then grinding until the particle size has been reduced to where the pigment dispersion has suitable tinctorial strength for use in inks and coatings.
Inventors
- 👤 Arthur H. Allen, III
- 👤 Arthur R. Heuser
- 👤 Richard J. Meyer
- 👤 Judy B. Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:38
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A method of converting pigment crude to an aqueous dispersed form, said method comprising A. premixing a crude with from about 12 to about 48% by weight of surfactant, based on pigment, and an amount of water sufficient to reduce the crude concentration to 10 to 50% by weight, based on the total mixture, and B. continuously pumping the blend of A. through at least two shot mills in series containing between 50 and 90% by volume of grinding media that has a size in the range of from about 0.1 to 1.5 mm diameter and then grinding until the particle size has been reduced to where the pigment dispersion has suitable tinctorial strength for use in inks and coatings.
Claim 2
Independent Claim
120 words
A method of converting pigment crude to an aqueous dispersed form, said method comprising A. premixing a crude with from about 12 to about 48% by weight of surfactant, based on pigment, and an amount of water sufficient to reduce the crude concentration to 10 to 50% by weight, based on the total mixture, and B. continuously pumping the blend of A. through at least two shot mills in series containing between 50 and 90% by volume of grinding media that has a size in the range of from about 0.1 to 1.5 mm diameter and then grinding until the particle size has been reduced to where the pigment dispersion has suitable tinctorial strength for use in inks and coatings.
Claim 3
Dependent Claim
24 words
The method of claim 1 in which the grinding in the shot mill is carried out at a temperature of 5° to 80° C.
Claim 4
Dependent Claim
24 words
A water-based printing ink comprising dispersed pigment in an aqueous solution of water-soluble resin wherein the pigment is dispersed by the method claim 1.
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) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |