US4081584A
Expired / Lapsed
US
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Electrostatic recording material and method for preparing the same
Assignee: JSR Corp
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Filing: 1974-12-17
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Granted: 1978-03-28
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Expires: 1994-12-17
Abstract
Abstract An electrostatic recording material having a good workability and a very good recording characteristic is prepared by coating such a base sheet as paper, plastic film, metal plate, etc. with an aqueous dispersion comprising (A) 100 parts by weight of at least one water-insoluble polymer comprising at least one monomer selected from ethylenic monomers and conjugated diolefinic monomers, and (B) 1-200 parts by weight of at least one water-soluble salt of polymer containing carboxyl groups by means of an air knife coater, roll coater, etc. It is possible to use not more than 6 parts by weight of the heretofore well-known nonionic emulsifier and/or the well-known anionic emulsifier together with said component.
Inventors
- 👤 Toyomi Akiyama
- 👤 Taiji Higaki
- 👤 Eiichiro Shiratsuchi
- 👤 Eijiro Tagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:55
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208; G03G5/0214; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31696; Y10T428/31699; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31906; Y10T428/31931; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
235 words
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.
Claim 2
Dependent Claim
235 words
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.
Claim 3
Dependent Claim
18 words
The electrostatic recording material according to claim 1 wherein the base sheet is paper treated with conductive material.
Claim 4
Dependent Claim
36 words
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.
Claim 5
Dependent Claim
19 words
The electrostatic recording material according to claim 1, wherein the coating has a thickness of 2 to 20 μ.
Claim 6
Dependent Claim
24 words
An electrostatic recording material according to claim 1, wherein the ethylenic monomer of (A) and (B) is one having 2 to 25 carbon atoms.
Claim 7
Dependent Claim
21 words
An electrostatic recording material according to claim 1, wherein the water-soluble salt is a salt of a copolymer of methacrylic acid.
Claim 8
Dependent Claim
47 words
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.
Claim 9
Dependent Claim
51 words
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.
Claim 10
Dependent Claim
54 words
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.
Claim 11
Dependent Claim
49 words
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.
Claim 12
Dependent Claim
25 words
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.
Claim 13
Dependent Claim
25 words
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.
Claim 14
Dependent Claim
46 words
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.
Claim 15
Dependent Claim
35 words
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.
Claim 16
Dependent Claim
42 words
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.
Claim 17
Dependent Claim
29 words
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.
Claim 18
Dependent Claim
18 words
The electrostatic recording material according to claim 16, wherein the powder is at least one synthetic polymer powder.
Claim 19
Dependent Claim
14 words
The electrostatic recording material according to claim 16, wherein the powder is starch particles.
Claim 20
Dependent Claim
16 words
The electrostatic recording material according to claim 16, wherein the powder is at least one pigment.
Claim 21
Dependent Claim
25 words
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.
Claim 22
Dependent Claim
37 words
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.
Claim 23
Dependent Claim
27 words
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.
Claim 24
Dependent Claim
26 words
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.
Claim 25
Dependent Claim
48 words
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.
Claim 26
Dependent Claim
26 words
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.
Claim 27
Dependent Claim
22 words
The electrostatic recording material according to claim 22, wherein the water-insoluble polymer is a polymer of butadiene and styrene or methyl methacrylate.
Claim 28
Dependent Claim
36 words
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.
Claim 29
Independent Claim
228 words
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.
Claim 30
Independent Claim
228 words
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.
Claim 31
Dependent Claim
19 words
A method according to claim 28, wherein a water-soluble salt is a salt of a copolymer of methacrylic acid.
Claim 32
Dependent Claim
38 words
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.
Claim 33
Dependent Claim
34 words
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.
Claim 34
Dependent Claim
26 words
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.
Claim 35
Dependent Claim
16 words
The method according to claim 32, wherein the powder is at least one synthetic polymer powder.
Claim 36
Dependent Claim
12 words
The method according to claim 32, wherein the powder is starch powder.
Claim 37
Dependent Claim
14 words
The method according to claim 32, wherein the powder is at least one pigment.
Claim 38
Dependent Claim
42 words
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.
Claim 39
Dependent Claim
53 words
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.
Claim 40
Dependent Claim
50 words
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.
Claim 41
Dependent Claim
53 words
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.
Claim 42
Dependent Claim
63 words
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |