US4269760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine spherical polymer particles containing inorganic pigment and/or coloring agent and process for the preparation thereof
Assignee: Sinloihi Co Ltd
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Filing: 1979-07-13
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Granted: 1981-05-26
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Expires: 1999-07-13
Abstract
Abstract A suspension polymerization of polymerizable monomers is conducted in a system containing an inorganic dispersion stabilizer and an inorganic pigment and/or black coloring agent, in which the polymerizable monomers have an opposite charge in water to the inorganic dispersion stabilizer whereby the former is ionically bound with the latter. The suspension polymerization during the middle stage in which polymer particles are apt to stick together is stabilized and the polymer particles are prevented from coalescing so that fine spherical polymer particles are obtained with a uniform particle size distribution. Also, the suspension polymerization is conducted having liquid resins involved in polymerizable monomers thereby to obtain non-sticky, free flowing particles. These particles adhere to paper sheets by mechanically smashing.
Inventors
- 👤 Saburo Wakimoto
- 👤 Sadayasu Miyahara
- 👤 Yoshihiko Hyosu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:12
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/006; C09B67/0063; C08; C08F; C08F2/00; C08F2/44; C09B67/0097
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
83 words
Fine spherical polymer particles with a uniform particle size distribution containing at least one member selected from the group of inorganic pigments and black coloring agents, which comprise polymerized products from polymerizable monomers and an inorganic dispersion stabilizer in which said polymerizable monomers are charged with cation or anion and said inorganic dispersion stabilizer has an opposite charge to said monomers, the surface of said polymer particles being firmly bound through ionic bond to and being completely covered with said inorganic dispersion stabilizer.
Claim 2
Dependent Claim
83 words
Fine spherical polymer particles with a uniform particle size distribution containing at least one member selected from the group of inorganic pigments and black coloring agents, which comprise polymerized products from polymerizable monomers and an inorganic dispersion stabilizer in which said polymerizable monomers are charged with cation or anion and said inorganic dispersion stabilizer has an opposite charge to said monomers, the surface of said polymer particles being firmly bound through ionic bond to and being completely covered with said inorganic dispersion stabilizer.
Claim 3
Dependent Claim
16 words
The polymer particles of claim 1 wherein the particle size is within the range of 2-50μ.
Claim 4
Dependent Claim
25 words
The polymer particles of claim 1 wherein said polymerizable monomers are charged with cation and the anionic inorganic dispersion stabilizer is colloidal silica or bentonite.
Claim 5
Dependent Claim
23 words
The polymer particles of claim 1 wherein said polymerizable monomers are charged with anion and the cationic inorganic dispersion stabilizer is aluminum oxide.
Claim 6
Dependent Claim
28 words
The polymer particles of claim 1 wherein said inorganic pigment is a magnetic substance which is selected from the group consisting of magnetic iron oxide and magnetic ferroalloy.
Claim 7
Dependent Claim
25 words
The polymer particles of claim 1 wherein said black coloring agent is carbon black or solvent dyes, basic dyes or acid dyes of black color.
Claim 8
Dependent Claim
94 words
Fine spherical polymer particles with a uniform particle size distribution containing at least one member selected from the group consisting of inorganic pigments and black coloring agents, which comprise polymerized products from polymerizable monomers having a resin liquid at normal temperature involved therein and an inorganic dispersion stabilizer in which said polymerizable monomers are charged with cation or anion and said inorganic dispersion stabilizer has an opposite charge to said polymerizable monomers, the surface of said polymer particles being firmly bound through ionic bond to and being completely covered with said inorganic dispersion stabilizer.
Claim 9
Dependent Claim
94 words
Fine spherical polymer particles with a uniform particle size distribution containing at least one member selected from the group consisting of inorganic pigments and black coloring agents, which comprise polymerized products from polymerizable monomers having a resin liquid at normal temperature involved therein and an inorganic dispersion stabilizer in which said polymerizable monomers are charged with cation or anion and said inorganic dispersion stabilizer has an opposite charge to said polymerizable monomers, the surface of said polymer particles being firmly bound through ionic bond to and being completely covered with said inorganic dispersion stabilizer.
Claim 10
Dependent Claim
29 words
The polymer particles of claim 7 wherein the resin liquid at normal temperature is involved in said polymerizable monomers in an amount of 10-90% by weight of the latter.
Claim 11
Dependent Claim
34 words
The polymer particles of claim 7 wherein said resin liquid at normal temperature is aromatic petroleum resins, α-pinene resins, β-pinene resins, dipentene resins, terpenephenol resin, α-pinene-phenol resins, styrene resins, epoxy resins or polyamide resins.
Claim 12
Dependent Claim
27 words
The polymer particles of claim 7 wherein said resin liquid at normal temperature is a liquid resin mixture having a resin solid at normal temperature dissolved therein.
Claim 13
Dependent Claim
35 words
The polymer particles of claims 1 or 7 wherein said inorganic pigment is within the range of 0.1-70% by weight of the polymerizable monomers or ones having a resin liquid at normal temperature involved therein.
Claim 14
Dependent Claim
36 words
The polymer particles of claims 1 or 7 wherein said black coloring agent is within the range of 0.1-30% by weight of the polymerizable monomers or ones having a resin liquid at normal temperature involved therein.
Claim 15
Dependent Claim
126 words
A process for the preparation of fine spherical polymer particles with a uniform particle size distribution containing at least one member selected from the group consisting of inorganic pigments and black coloring agents, which comprises effecting a suspension polymerization of polymerized products from polymerizable monomers and an inorganic dispersant in which said polymerizable monomers are charged in water (a) with cation by adding a cationic polymerizable monomer or difficulty water soluble organic amines or (b) with anion by adding an anionic polymerizable monomer and said inorganic dispersant in water has an opposite charge to said polymerizable monomers, and said suspension polymerization being under such a condition that the surface of the polymerizable monomer particles is ionically bound to and uniformly covered with said inorganic dispersion stabilizer.
Claim 16
Dependent Claim
126 words
A process for the preparation of fine spherical polymer particles with a uniform particle size distribution containing at least one member selected from the group consisting of inorganic pigments and black coloring agents, which comprises effecting a suspension polymerization of polymerized products from polymerizable monomers and an inorganic dispersant in which said polymerizable monomers are charged in water (a) with cation by adding a cationic polymerizable monomer or difficulty water soluble organic amines or (b) with anion by adding an anionic polymerizable monomer and said inorganic dispersant in water has an opposite charge to said polymerizable monomers, and said suspension polymerization being under such a condition that the surface of the polymerizable monomer particles is ionically bound to and uniformly covered with said inorganic dispersion stabilizer.
Claim 17
Dependent Claim
20 words
The process of claim 13 wherein said polymerizable monomers are monomers having a resin liquid at normal temperature involved therein.
Claim 18
Dependent Claim
37 words
The process of claims 13 or 14 wherein said ionic substances are used in an amount of at least 0.1% by weight of said polymerizable monomers or monomers having a resin liquid at normal temperature involved therein.
Claim 19
Dependent Claim
39 words
The process of claims 13 or 14 wherein said inorganic dispersion stabilizer is used in an amount of at least 0.1 phr by weight of said polymerizable monomers or monomers having a resin liquid at normal temperature involved therein.
Claim 20
Dependent Claim
24 words
The process of claim 13 wherein said polymerizable monomers are charged with cation and the anionic inorganic dispersion stabilizer is colloidal silica or bentonite.
Claim 21
Dependent Claim
22 words
The process of claim 13 wherein said polymerizable monomers are charged with anion and the cationic inorganic dispersion stabilizer is aluminum oxide.
Claim 22
Dependent Claim
18 words
The process of claim 13 wherein said suspension polymerization is effected using a homogenizer with high shearing force.
Claim 23
Dependent Claim
16 words
The process of claim 19 wherein the particle size is maintained within the range of 2-30μ.
Claim 24
Dependent Claim
24 words
The process of claim 20 wherein the ionic substances are used in an amount of more than 0.4% by weight of the polymerizable monomers.
Claim 25
Dependent Claim
25 words
The process of claim 20 wherein the inorganic dispersion stabilizer is used in an amount of more than 0.4% by weight of the polymerizable monomers.
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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |