US3897586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer coated pigment particles and a process for their preparation
Assignee: EIDP Inc
•
Filing: 1972-08-04
•
Granted: 1975-07-29
•
Expires: 1992-08-04
Abstract
Abstract The deposition of polymers as thin coatings on finely divided pigment particles is accomplished by polymerizing at least one ethylenically unsaturated monomer precursor in the presence of the pigment particles without the presence of a surface-active agent. The process is made feasible through the use of a reaction medium capable of dissolving the monomer reactants but incapable of dissolving the derived polymer. A variety of coated products are prepared indicating the general nature of the process both from the standpoint of type of polymer which can be deposited and also the type of inorganic substrate which can be used.
Inventors
- 👤 James Newton Coker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:31
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/44; C08F292/00; C09; C09C; C09C3/00; C09C3/10; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/90; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
143 words
A PROCESS FOR PREPARING POLYMER-COATED FINELY DIVIDED INORGANIC PARTICLES WHICH COMPRISES SUSPENDING FINELY DIVIDED HYDROPHILIC INORGANIC PARTICLES SELECTED FROM THE GROUP CONSISTING OF METAL OXIDES, CLAY, COLLOIDAL SILICA, AND ZINC CHROMATE IN A NON-AQUEOUS LIQUID REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF ALUPHATIC HYDROCARBONS AND CYCLOHEXANE WITHOUT THE PRESENCE OF A SURFACE-ACTIVE AGENT, ADDING POLYMERIZABLE ETHYLENICALLY UNSATURATED MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ESTERS, METHACRYLIC ESTERS, VINYL ESTERS, VINYL HALIDES, VINYLIDENE HALIDES, ACRYLIC ACID, AND METHACRYLIC ACID AND A FREE-RADICAL INITIATOR TO THE MEDIUM AT A RATE WHICH APPROXIMATES THE RATE OF POLYMERIZATION, AND POLYMERIZING THE MONOMER IN SITU ONTO THE PARTICLES UNTIL A POLYMER LOADING OF AT LEAST ABOUT 0.5 WEIGHT PERCENT IS REACHED, SAID LIQUID REACTION MEDIUM BEING A SOLVENT FOR THE MONOMER AND INITIATOR AND A NON-SOLVENT FOR THE POLYMER FORMED AS A COATING ON THE PARTICLES.
Claim 2
Dependent Claim
143 words
A PROCESS FOR PREPARING POLYMER-COATED FINELY DIVIDED INORGANIC PARTICLES WHICH COMPRISES SUSPENDING FINELY DIVIDED HYDROPHILIC INORGANIC PARTICLES SELECTED FROM THE GROUP CONSISTING OF METAL OXIDES, CLAY, COLLOIDAL SILICA, AND ZINC CHROMATE IN A NON-AQUEOUS LIQUID REACTION MEDIUM SELECTED FROM THE GROUP CONSISTING OF ALUPHATIC HYDROCARBONS AND CYCLOHEXANE WITHOUT THE PRESENCE OF A SURFACE-ACTIVE AGENT, ADDING POLYMERIZABLE ETHYLENICALLY UNSATURATED MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ESTERS, METHACRYLIC ESTERS, VINYL ESTERS, VINYL HALIDES, VINYLIDENE HALIDES, ACRYLIC ACID, AND METHACRYLIC ACID AND A FREE-RADICAL INITIATOR TO THE MEDIUM AT A RATE WHICH APPROXIMATES THE RATE OF POLYMERIZATION, AND POLYMERIZING THE MONOMER IN SITU ONTO THE PARTICLES UNTIL A POLYMER LOADING OF AT LEAST ABOUT 0.5 WEIGHT PERCENT IS REACHED, SAID LIQUID REACTION MEDIUM BEING A SOLVENT FOR THE MONOMER AND INITIATOR AND A NON-SOLVENT FOR THE POLYMER FORMED AS A COATING ON THE PARTICLES.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the finely divided hydrophilic inorganic particles are acicular pigments.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein the finely divided hydrophilic inorganic particles are metal oxides selected from the group consisting of titanium dioxide, antimony oxide and zinc oxide.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the liquid reaction medium is a straight chain aliphatic hydrocarbon.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the liquid reaction medium is hexane or heptane.
Claim 7
Dependent Claim
29 words
The process of claim 5 wherein said monomer is methyl methacrylate, ethyLene glycol dimethacrylate, ethylhexyl acrylate, ethyl acrylate, vinyl acetate, vinyl chloride, vinylidene chloride, acrylic acid or methacrylic acid.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein the free-radical initiator is an organic peroxide or azo compound.
Claim 9
Dependent Claim
19 words
The process of claim 7 wherein the free-radical initiator is Alpha , Alpha ''-azobisisobutyronitrile, benzyl peroxide or t-butyl peroxypivalate.
Claim 10
Dependent Claim
19 words
The process of claim 8 wherein said monomer is a mixture of methyl methacrylate, ethyl acrylate, and methacrylic acid.
Claim 11
Dependent Claim
51 words
The process of claim 1 wherein the liquid reaction medium is an aliphatic hydrocarbon, the free-radical initiator is selected from the group consisting of organic peroxides and azo compounds, and the monomer is polymerized onto the particles until a polymer loading of from about 1.5 to 80 weight percent is reached.
Claim 12
Dependent Claim
38 words
The process of claim 10 wherein said liquid reaction medium is a non-polar straight chain aliphatic hydrocarbon and said monomer is polymerized onto the particles until a polymer loading of at least about 3 weight percent is reached.
Claim 13
Dependent Claim
39 words
The process of claim 11 wherein said aliphatic hydrocarbon is hexane or heptane and said ethylenically unsaturated monomer is methyl methacrylate, ethylhexyl acrylate, ethyl acrylate, ethylene glycol dimethacrylate, vinyl acetate, vinyl chloride, vinylidene chloride, acrylic acid or methacrylic acid.
Claim 14
Dependent Claim
9 words
The product prepared by the process of claim 1.
Claim 15
Dependent Claim
9 words
The product prepared by the process of claim 12.
References Cited (Backward Citations)
US2876133A
Cited
US3083118A
Cited
US3068185A
Cited
US3519593A
Cited
US3503785A
Cited
US3635752A
Cited
US3661620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |