US3586247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion of pigments in normally solid carrier media
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1968-05-08
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Granted: 1971-06-22
•
Expires: 1988-05-08
Abstract
Abstract Grinding a mixture of pigment and a carrier for the pigment at a temperature above the melting point of the carrier which is normally solid at room temperature. The dispersed product of such process is particularly suited for use in coloring plastic since the carrier acts both as an agglomeration preventing agent and to release discrete particles of pigment when added to the plastic.
Inventors
- 👤 Lyle Eugene Perrins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:53
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/006; C09C3/04; C09C3/041; C09C3/10; C01; C01P; C01P2004/00; C01P2004/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
17 words
A process according to claim 1 in which the grinding is carried out in a bead mill.
Claim 2
Dependent Claim
24 words
A process according to claim 1 in which the carrier melts to give a liquid having a viscosity below 200 poises at 200* C.
Claim 3
Dependent Claim
22 words
A process according to claim 1 in which the carrier comprises polyethylene having a molecular weight in the range 1500 to 3000.
Claim 4
Dependent Claim
24 words
A process according to claim 1 in which the carrier comprises a member of the group consisting of rosin, polymerized rosin and rosin esters.
Claim 5
Dependent Claim
21 words
A process according to claim 1 in which a stabilizer is also ground with the mixture of the pigment and carrier.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |