Claims
- 1. An electrostatic recording material on which an electrostatic latent image can be formed consisting essentially of a base sheet having a dried coating thereon of an electric-charge-retentive layer of dielectric polymeric film prepared from an aqueous dispersion comprising (A) 100 parts by weight of at least one water-insoluble polymer prepared from at least one monomer selected from the group consisting of (1) conjugated diolefinic monomers and (2) ethylenic monomers selected from the group consisting of linear olefines, branched olefines, aromatic vinyl compounds, vinyl cyanide compounds, alkyl acrylates, alkyl methacrylates, vinyl ethers, and vinyl halides, and (B) 1 to 200 parts by weight of at least one water-soluble salt selected from the group consisting of an ammonium salt and organic amine salt of a copolymer selected from the group consisting of (1) copolymers of ethylenic monomers selected from the group consisting of linear olefines, branched olefines, aromatic vinyl compounds, vinyl cyanide compounds, alkyl acrylates, alkyl methacrylates, vinyl halides, acrylamide, methacrylamide, and vinyl ethers and unsaturated monobasic carboxylic acids, (2) copolymers of conjugated diolefinic monomers and unsaturated monobasic carboxylic acids, and (3) copolymers of ethylenic monomers selected from the group consisting of linear olefines, branched olefines, aromatic vinyl compounds, vinyl cyanide compounds, alkyl acrylates, alkyl methacrylates, vinyl halides, acrylamide, methacrylamide, and vinyl ethers, conjugated diolefinic monomers and unsaturated monobasic carboxylic acids, said water soluble salt of the copolymer containing 8 to 50 mole percent of carboxyl groups.
- 2. The electrostatic recording material according to claim 1 wherein the base sheet is paper treated with conductive material.
- 3. The electrostatic recording material according to claim 1, wherein the water-insoluble polymer is at least one polymer prepared from at least one monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, styrene and butadiene.
- 4. The electrostatic recording material according to claim 1, wherein the coating has a thickness of 2 to 20 .mu..
- 5. An electrostatic recording material according to claim 1, wherein the ethylenic monomer of (A) and (B) is one having 2 to 25 carbon atoms.
- 6. An electrostatic recording material according to claim 1, wherein the water-soluble salt is a salt of a copolymer of methacrylic acid.
- 7. The electrostatic recording material according to claim 1, wherein the water-insoluble polymer is a copolymer containing 20% by weight butadiene and 80% by weight styrene and the water-soluble salt is a salt of a copolymer containing 85% by weight methyl methacrylate and 15% by weight methacrylic acid.
- 8. The electrostatic recording material according to claim 1, wherein the water-insoluble polymer is a copolymer containing 20% by weight butadiene and 80% by weight styrene and the water-soluble salt is a salt of a terpolymer containing 20% by weight styrene, 65% by weight methyl methacrylate and 15% by weight methacrylic acid.
- 9. The electrostatic recording material of claim 1, wherein the water-insoluble polymer is a copolymer containing 80% by weight styrene and 20% by weight butadiene and the water-soluble salt is a salt of a copolymer containing 20% by weight butadiene, 20% by weight styrene, 30% by weight methyl methacrylate and 30% by weight methacrylic acid.
- 10. The electrostatic recording material of claim 1, wherein said water-insoluble polymer is a copolymer containing 80% by weight styrene and 20% by weight butadiene and the water-soluble salt is a salt of a terpolymer containing 20% by weight butadiene, 30% by weight styrene and 50% by weight methacrylic acid.
- 11. The electrostatic recording material according to claim 1, wherein the conjugated diolefinic monomer of (A) and (B) is one having 4 to 10 carbon atoms.
- 12. The electrostatic recording material according to claim 11, wherein the conjugated diolefinic monomer is selected from the group consisting of butadiene, isoprene, chloroprene and piperylene.
- 13. The electrostatic recording material according to claim 1, wherein said aqueous dispersion also comprising not more than 6 parts by weight of at least one emulsifier selected from the group consisting of nonionic emulsifiers and anionic emulsifiers per 100 parts by weight of the water-insoluble polymer.
- 14. The electrostatic recording material according to claim 13, wherein the nonionic emulsifier is selected from the group consisting of polyoxyethylene alkyl ethers, polyoxyethylene aryl ethers, polyoxyethylene alkyl esters, polyoxyethylene aryl esters, and polyoxyethylene-polyoxypropylene block copolymers.
- 15. The electrostatic recording material according to claim 13, wherein the anionic emulsifier is selected from the group consisting of alkali metal salts, amine salts and ammonium salts of higher fatty acids, higher alkylsulfuric acids, alkylaryl sulfonic acids, dialkylsulfosuccinic acids and resin acids.
- 16. The electrostatic recording material according to claim 1, wherein the dielectric polymer film additionally contains at least one powder selected from the group consisting of organic and inorganic powders.
- 17. The electrostatic recording material according to claim 16, wherein the powder is at least one synthetic polymer powder.
- 18. The electrostatic recording material according to claim 16, wherein the powder is starch particles.
- 19. The electrostatic recording material according to claim 16, wherein the powder is at least one pigment.
- 20. An electrostatic recording material according to claim 1, wherein the water-soluble salt is a salt of a terpolymer of butadiene, methyl methacrylate, and methacrylic acid.
- 21. The electrostatic recording material according to claim 22, wherein the aqueous dispersion contains 50 parts by weight of polystyrene and 50 parts by weight of a copolymer containing 60% by weight butadiene and 40% by weight styrene.
- 22. The electrostatic recording material according to claim 20, wherein the terpolymer contains 30% by weight butadiene, 55% by weight methyl methacrylate and 15% by weight methacrylic acid.
- 23. The electrostatic recording material according to claim 22, wherein the water-insoluble polymer is a polymer containing 20% by weight butadiene and 80% by weight methyl methacrylate.
- 24. The electrostatic recording material according to claim 22, wherein the aqueous dispersion contains 50 parts by weight of a copolymer containing 10% by weight butadiene and 90% by weight styrene and 50 parts by weight of a copolymer containing 50% by weight butadiene and 50% by weight styrene.
- 25. The electrostatic recording material according to claim 22, wherein the water-insoluble polymer is a copolymer containing 80% by weight styrene and 20% by weight butyl acrylate.
- 26. The electrostatic recording material according to claim 22, wherein the water-insoluble polymer is a polymer of butadiene and styrene or methyl methacrylate.
- 27. The electrostatic recording material according to claim 26, wherein the water-insoluble polymer is a polymer containing 10, 15, 20 or 60% by weight of butadiene and 90, 85, 80 or 40% by weight of styrene, respectively.
- 28. A method for preparing an electrostatic recording material, which comprises preparing an aqueous dispersion comprising (A) 100 parts by weight of at least one water-insoluble polymer prepared from at least one monomer selected from the group consisting of (1) conjugated diolefinic monomers, and (2) ethylenic monomers selected from the group consisting of linear olefines, branched olefines, aromatic vinyl compounds, vinyl cyanide compounds, alkyl acrylates, alkyl methacrylates, vinyl ethers, and vinyl halides, and (B) 1-200 parts by weight of at least one water-soluble salt selected from the group consisting of an ammonium salt and organic amine salt of a copolymer selected from the group consisting of (1) copolymers of ethylenic monomers selected from the group consisting of linear olefines, branched olefines, aromatic vinyl compounds, vinyl cyanide compounds, alkyl acrylates, alkyl methacrylates, vinyl halides, acrylamide, methacrylamide, and vinyl ethers and unsaturated monobasic carboxylic acids, (2) copolymers of conjugated diolefinic monomers and monobasic unsaturated carboxylic acids, and (3) copolymers of ethylenic monomers selected from the group consisting of linear olefins, branched olefins, aromatic vinyl compounds, vinyl cyanide compounds, alkyl acrylates, alkyl methacrylates, vinyl halides, acrylamide, methacrylamide, and vinyl ethers, conjugated diolefinic monomers and monobasic unsaturated carboxylic acids, said water soluble salt of the copolymer containing 8 to 50 mole percent of carboxyl groups, and coating a surface of a base sheet with said aqueous dispersion and drying the thus coated product.
- 29. A method according to claim 28, wherein a water-soluble salt is a salt of a copolymer of methacrylic acid.
- 30. The method according to claim 28, wherein the water-soluble salt is an ammonium salt of a terpolymer of butadiene, methyl methacrylate and methacrylic acid, and the water-insoluble polymer is a copolymer of butadiene and styrene or methyl methacrylate.
- 31. The method according to claim 20, wherein the aqueous dispersion is obtained by polymerizing the monomer constituting the component (A) in the presence of the water-soluble salt of polymer containing carboxyl groups in water.
- 32. The method according to claim 28, wherein the aqueous dispersion additionally contains at least one powder selected from the group consisting of organic and inorganic powders.
- 33. The method according to claim 32, wherein the powder is at least one synthetic polymer powder.
- 34. The method according to claim 32, wherein the powder is starch powder.
- 35. The method according to claim 32, wherein the powder is at least one pigment.
- 36. The method according to claim 20, wherein not more than 6 parts by weight of at least one emulsifier selected from the group consisting of nonionic emulsifiers and anionic emulsifiers is additionally used per 100 parts by weight of the water-insoluble polymer.
- 37. The method according to claim 21, wherein the aqueous dispersion is obtained by polymerizing the monomer constituting the component (A) in the presence of the water-soluble salt of polymer containing carboxyl groups in water and then adding thereto at least one emulsifier selected from the group consisting of nonionic emulsifiers and anionic emulsifiers.
- 38. The method according to claim 21, wherein the aqueous dispersion is obtained by polymerizing the monomer constituting the component (A) in the presence of the water-soluble salt of polymer containing carboxyl groups, and at least one emulsifier selected from the group consisting of nonionic emulsifiers and anionic emulsifiers in water.
- 39. The method according to claim 21, wherein the aqueous dispersion is obtained by polymerizing the monomer constituting the component (A) in the presence of at least one emulsifier selected from the group consisting of nonionic emulsifiers and anionic emulsifiers in water and then adding thereto the water-soluble salt of polymer containing carboxyl groups.
- 40. The method according to claim 36, wherein the aqueous dispersion is obtained by polymerizing the monomer constituting the component (A) by solution polymerization and dispersing the resulting polymer in water in the presence of the water-soluble salt of polymer containing carboxyl groups alone or a mixture thereof with at least one emulsifier selected from the group consisting of nonionic emulsifiers and anionic emulsifiers.
Priority Claims (1)
Number |
Date |
Country |
Kind |
44-91544 |
Nov 1969 |
JA |
|
Parent Case Info
This is a continuation of application Ser. No. 86,630 filed Nov. 3, 1970 and abandoned.
US Referenced Citations (8)
Continuations (1)
|
Number |
Date |
Country |
Parent |
86630 |
Nov 1970 |
|