Patent US4349389A successfully refreshed from Google Patents.
US4349389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersible inorganic pigment
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1980-12-29
•
Granted: 1982-09-14
•
Expires: 2000-12-29
Abstract
Abstract A dispersible inorganic pigment composition in which the surface of a finely divided inorganic pigment is coated with a substance which renders the surface hydrophobic and then with a thermoplastic polymer and a process for the preparation of the composition. The composition is readily dispersible in thermoplastics and paints and it can be used to color thermoplastic materials directly, avoiding the preparation of a master batch.
Inventors
- 👤 John D. Schofield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:29
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/006; C09C3/08; C09C3/10; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A dispersible pigment composition comprising a finely divided inorganic pigment the particles of which carry a first layer of a hydrophobing agent consisting of a hydrophobic chain containing from 12 to 250 carbon atoms attached to a hydrophilic group which anchors the hydrophobic chain to the pigment surface, and a second layer of a thermoplastic polymer or a mixture thereof with an emulsifying agent, having a softening point at or below 100° C., the second layer evenly covering and adhering to the hydrophobic first layer.
Claim 2
Dependent Claim
85 words
A dispersible pigment composition comprising a finely divided inorganic pigment the particles of which carry a first layer of a hydrophobing agent consisting of a hydrophobic chain containing from 12 to 250 carbon atoms attached to a hydrophilic group which anchors the hydrophobic chain to the pigment surface, and a second layer of a thermoplastic polymer or a mixture thereof with an emulsifying agent, having a softening point at or below 100° C., the second layer evenly covering and adhering to the hydrophobic first layer.
Claim 3
Dependent Claim
19 words
A dispersible pigment composition according to claim 1 wherein the polymer has a weight average molecular weight below 20,000.
Claim 4
Dependent Claim
24 words
A dispersible pigment composition according to claim 1 wherein the carbon atoms of the hydrophobic chain are interrupted by oxygen, nitrogen or sulphur atoms.
Claim 5
Dependent Claim
42 words
A pigment composition according to claim 1 containing from 40% to 95% of the pigment, from 2.5% to 25% of the hydrophobing agent and from 5% to 40% of the polymer all by weight based on the total weight of the composition.
Claim 6
Dependent Claim
97 words
A process for preparing a dispersible inorganic pigment composition which comprises (a) treating a slurry of a finely divided inorganic pigment in an inert liquid with a hydrophobing agent consisting of a hydrophobic chain containing from 12 to 250 carbon atoms attached to a hydrophilic group, capable of anchoring the hydrophobic chain to render the surface of the pigment hydrophobic followed by (b) treating the hydrophobic pigment with a thermoplastic polymer, or a mixture thereof with an emulsifying agent having a softening point at or below 100° C., at the temperature of or above said softening point.
Claim 7
Dependent Claim
97 words
A process for preparing a dispersible inorganic pigment composition which comprises (a) treating a slurry of a finely divided inorganic pigment in an inert liquid with a hydrophobing agent consisting of a hydrophobic chain containing from 12 to 250 carbon atoms attached to a hydrophilic group, capable of anchoring the hydrophobic chain to render the surface of the pigment hydrophobic followed by (b) treating the hydrophobic pigment with a thermoplastic polymer, or a mixture thereof with an emulsifying agent having a softening point at or below 100° C., at the temperature of or above said softening point.
Claim 8
Dependent Claim
24 words
A process according to claim 5 wherein the hydrophobing agent and the polymer are added as solutions, emulsions or dispersions in an inert liquid.
Claim 9
Dependent Claim
15 words
A process according to claim 5 in which the inert liquid is an aqueous medium.
References Cited (Backward Citations)
US3409585A
Cited
US3956230A
Cited
US3773539A
Cited
US4068024A
Cited
US3819566A
Cited
US4038244A
Cited
US4091164A
Cited
GB1538718A
Cited
US4127421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |