Fine spherical polymer particles containing inorganic pigment and/or coloring agent and process for the preparation thereof

• US 4,314,932 A
• Filed: 08/18/1980
• Issued: 02/09/1982
• Est. Priority Date: 07/07/1978
• Status: Expired due to Term

• Current Assignee: Sinloihi Co. Ltd. (DAI Nippon Toryo Company Limited)
• Original Assignee: Sinloihi Co. Ltd. (DAI Nippon Toryo Company Limited)
• Inventors: Hyosu, Yoshihiko, Miyahara, Sadayasu, Wakimoto, Saburo
• Primary Examiner(s): Jacobs, Lewis T.
• Application Number:
  US06/178,930
• Time in Patent Office: 540 Days
• Field of Search: 260/42.53, 260/42.57, 260/37 N, 260/37 EP
• US Class Current: 524/430
• CPC Class Codes: C08F 2/44 Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• CPC Class Codes: C09B 67/0063 of organic pigments with only macromolecular substances
• CPC Class Codes: C09B 67/0097 Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes
• CPC Class Codes: Y10S 524/904 Powder coating compositions

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 mechnically smashing.

Claims

1. 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 at least one polymerizable monomer and an inorganic dispersion stabilizer in which said polymerizable monomer is charged with cation or anion and said inorganic dispersion stabilizer has an opposite charge to said monomer, said polymerizable monomer is a member selected from the group consisting of trimethylolpropane triacrylate, trimethylolethane triacrylate and tetramethylolmethane tetracrylate, the surface of said polymer particles being firmly bound through ionic bond to and being completely covered with said inorganic dispersion stabilizer.

2. The polymer particles according to claim 1 wherein said polymerizable monomer contain a resin liquid at normal temperature which is a completely hydrogenated polybutadiene.

3. 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 at least one polymerizable monomer and an inorganic dispersant in which said polymerizable monomer is charges 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 monomer, 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, wherein 0.8 g of colloidal silica of average size 7 mμ

-40 mμ

is dispersed in 1000 cc of water, a mixture of 250 g of ferrosoferric oxide or carbon black, 0.8 g of dimethylaminoethyl methacrylate, 80 g of styrene resin, 318 g of styrene and 2 g of divinyl benzene is added and polymerization is carried out at 90°

C. for six hours.

4. 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 at least one polymerizable monomer and an inorganic dispersant in which said polymerizable monomer is charges 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 monomer, 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, wherein 4 g of colloidal silica of average size 7 mμ

-40 mμ

is dispersed in 800 cc of distilled water, a mixture of 40 g of titanium oxide or 100 g of carbon black, 2 g of dodecylamine, a resin solution having 20 g of rosin modified phenol resin dissolved in 140 g of aromatic petroleum resin, 237 g of styrene and 3 g of dinvinyl benzene is added, the mixture is heated to 80°

C. and polymerization is effected for six hours.

5. 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 at least one polymerizable monomer and an inorganic dispersant in which said polymerizable monomer is 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 monomer, 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, wherein 2 g of Aluminum Oxide C is suspended in 900 ml of distilled water, a mixture of 100 g of magnetic iron powder or Basic Black, 8, 2 g of the methacrylic acid, a resin solution of 4 g of coumarone resin in 36 g of polyamide resin, 324 g of methyl methacrylate and 36 g of ethyleneglycol dimethacrylate is added, the temperature is raised to 80°

C. and polymerization is effected for five hours.