US4725317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pigment compositions
Assignee: Silberline Ltd
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Filing: 1986-02-24
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Granted: 1988-02-16
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Expires: 2006-02-24
Abstract
Abstract The invention relates to a process for preparing low- or non-dusting substantially completely non-volatile metal pigment compositions by forming a coherent paste comprising an organic binder medium, an organic liquid vehicle and metal pigment, in powder or flake form, the paste being formed by mixing a first component comprising the organic binder medium and a second component comprising metal pigment with either or both of the first and second components comprising organic liquid vehicle and the paste containing from 1 to 70 percent, preferably from 3 to 45 percent, of the organic binder medium based on the weight of the metal pigment, and removing substantially all of the organic liquid vehicle(s) from the coherent paste, optionally after sub-dividing the coherent paste into particles, such as pellets, tablets or granules. The resulting solid metal pigment composition comprises metal pigment particles dispersed in a matrix of the organic binder material.
Inventors
- 👤 Ian R. Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:21
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0092; C09B67/0094; C09C; C09C1/00; C09C1/62; C09D; C09D17/00; C09D17/004; C09D17/006; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/64; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
218 words
A process for preparing a solid low- or non-dusting, metal pigment composition which comprises forming a coherent paste consisting essentially of an organic binder medium, an organic liquid vehicle and metal pigment, in powder or flake form, the paste being formed by mixing a first component comprising the organic binder medium and a second component comprising metal pigment with either or both of the first and second components comprising organic liquid vehicle and the paste containing from 3 to 45 percent of the organic binder medium based on the weight of the metal pigment, and either sub-dividing the coherent paste into particles and removing substantially all organic liquid vehicle from the particles, or removing substantially all organic liquid vehicle from the coherent paste and sub-dividing the resulting mass into particles, at least 98 percent by weight of the resulting particles being retained on a sieve having a 150 micrometer nominal aperture and each containing a plurality of metal pigment particles dispersed in a matrix of organic binder medium, the organic binder medium being capable of solution or dispersion in the organic liquid vehicle and of binding the metal pigment particles at ambient temperature and when capable of dispersion in the organic liquid vehicle having a melting or softening temperature below the boiling point of the organic liquid vehicle.
Claim 2
Dependent Claim
218 words
A process for preparing a solid low- or non-dusting, metal pigment composition which comprises forming a coherent paste consisting essentially of an organic binder medium, an organic liquid vehicle and metal pigment, in powder or flake form, the paste being formed by mixing a first component comprising the organic binder medium and a second component comprising metal pigment with either or both of the first and second components comprising organic liquid vehicle and the paste containing from 3 to 45 percent of the organic binder medium based on the weight of the metal pigment, and either sub-dividing the coherent paste into particles and removing substantially all organic liquid vehicle from the particles, or removing substantially all organic liquid vehicle from the coherent paste and sub-dividing the resulting mass into particles, at least 98 percent by weight of the resulting particles being retained on a sieve having a 150 micrometer nominal aperture and each containing a plurality of metal pigment particles dispersed in a matrix of organic binder medium, the organic binder medium being capable of solution or dispersion in the organic liquid vehicle and of binding the metal pigment particles at ambient temperature and when capable of dispersion in the organic liquid vehicle having a melting or softening temperature below the boiling point of the organic liquid vehicle.
Claim 3
Dependent Claim
29 words
A process according to claim 1 wherein the coherent paste contains from 5 to 30 percent of the organic binder medium based on the weight of the metal pigment.
Claim 4
Dependent Claim
43 words
A process according to claim 1 wherein a solution or dispersion of the organic binder medium in an organic liquid vehicle is mixed with dry metal pigment or with a dispersion of metal pigment in the same or a different organic liquid vehicle.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein the organic liquid vehicle comprises mineral spirits.
Claim 6
Dependent Claim
21 words
A process according to claim 1 wherein the binder material is soluble or dispersible in water or an aqueous application medium.
Claim 7
Dependent Claim
16 words
A process according to claim 1 wherein the metal pigment is of aluminium, bronze or zinc.
Claim 8
Dependent Claim
36 words
A process according to claim 1 wherein the metal pigment is in the form of flakes having an average particle thickness of 0.02 to 2 micrometers and a second largest dimension of less than 150 micrometers.
Claim 9
Dependent Claim
30 words
A process according to claim 7 wherein the metal pigment flakes have an average thickness of 0.05 to 1.5 micrometers and a second largest dimension of 8 to 35 micrometers.
Claim 10
Dependent Claim
74 words
A process according to claim 7 wherein the second component is a paste of 55 to 80 percent by weight metal flake content prepared by wet ball-milling metal powder or chopped metal foil with an organic liquid vehicle and separating the resulting metal flakes to provide the desired particle size distribution, with the resulting flake paste being directly used as the second component for mixing with the first component to produce said coherent paste.
Claim 11
Dependent Claim
23 words
A process according to claim 1 wherein the metal pigment is a powder of essentially spherical particles of 2 to 200 micrometers diameter.
Claim 12
Dependent Claim
17 words
A process according to claim 10 wherein the particles have a diameter of 5 to 75 micrometers.
Claim 13
Dependent Claim
11 words
The metal pigment composition prepared by the process of claim 1.
Claim 14
Dependent Claim
11 words
The metal pigment composition prepared by the process of claim 9.
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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |