US4405729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigment grind with fumed silica
Assignee: EIDP Inc
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Filing: 1982-06-17
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Granted: 1983-09-20
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Expires: 2002-06-17
Abstract
Abstract In the formulation of high solids pigmented film-forming coating compositions comprising low molecular weight polyester oligomers, co-dispersing fumed silica with the pigment mill base, then incorporating this co-dispersion into the composition yields enhanced color stability for the coating composition.
Inventors
- 👤 Francis E. Schweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:46
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09; C09D; C09D167/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
In the process of formulating a pigmented coating composition, said composition comprising: (1) inorganic pigment, (2) a film-forming blend and a solvent for the blend, (3) an additive to provide pseudoplastic rheology to said composition, said additive comprising fumed silica, wherein said film-forming blend consists essentially of low molecular weight polyester oligomers, a curing agent for said oligomers, and optionally an epoxy resin or the ester of an epoxy resin and monocarboxylic acid, and said film-forming blend is present in an amount of at least 50% by weight of said composition, the improvement wherein a co-dispersion of said inorganic pigment and at least a portion of said fumed silica is prepared and incorporated into said composition, said fumed silica being present in said co-dispersion in an amount sufficient to yield enhanced color stability to said composition.
Claim 2
Dependent Claim
136 words
In the process of formulating a pigmented coating composition, said composition comprising: (1) inorganic pigment, (2) a film-forming blend and a solvent for the blend, (3) an additive to provide pseudoplastic rheology to said composition, said additive comprising fumed silica, wherein said film-forming blend consists essentially of low molecular weight polyester oligomers, a curing agent for said oligomers, and optionally an epoxy resin or the ester of an epoxy resin and monocarboxylic acid, and said film-forming blend is present in an amount of at least 50% by weight of said composition, the improvement wherein a co-dispersion of said inorganic pigment and at least a portion of said fumed silica is prepared and incorporated into said composition, said fumed silica being present in said co-dispersion in an amount sufficient to yield enhanced color stability to said composition.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said fumed silica is present in said co-dispersion in an amount of from 0.25 to 5.0% by weight, based on the weight of said film-forming blend.
Claim 4
Dependent Claim
32 words
The process of claim 2 wherein said fumed silica is present in said co-dispersion in an amount of from 0.75 to 3.0% by weight, based on the weight of said film-forming blend.
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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |