US3920880A
Expired / Lapsed
US
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Electrostatic recording material
Assignee: JSR Corp
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Filing: 1973-09-07
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Granted: 1975-11-18
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Expires: 1993-09-07
Abstract
Abstract Improved electrostatic recording material having a mat-finish surface and excellent electrostatic recording characteristics and capable of being written thereupon by conventional ink pens, lead pencils, and ballpoint pens and also capable of receiving impression made by conventional rubber stamps or printing processes can be made by coating a base sheet with a composition comprising (I) 10 to 90 parts by weight (as solids) of at least one member selected from the group consisting of (A) an aqueous solution of an amine or ammonium salt of a copolymer having a film-formability at a temperature not higher than 70*C and composed of (a) 8 to 50 mole percent in terms of free carboxyl group) of a carboxyl group-containing polymerizable monomer and (b) 92 to 50 mole percent of at least one monomer selected from the group consisting of an ethylenic monomer and a conjugated diolefinic monomer and (b) an aqueous dispersion of a polymer having a film-formability at a temperature not higher than 70*C prepared by polymerizing (a'') 100 parts by weight of at least one monomer selected from the group consisting of an ethylenic monomer and a conjugated diolefinic monomer in (b'') 1 to 200 parts by weight (as solids) of an aqueous solution of an amine or ammonium salt of a copolymer composed of an unsaturated carboxylic acid and at least one monomer selected from the group consisting of an ethylenic monomer and a conjugated diolefinic monomer, and (II) 90 to 10 parts by weight (as solids) of an aqueous dispersion of a water-insoluble homopolymer or copolymer having no film-formability at a temperature not higher than 70*C and having an average particle size of 1 to 20 Mu prepared by emulsion or suspension-polymerizing at least one monomer selected from an ethylenic monomer and a conjugated diolefinic monomer, and drying the resulting assembly.
Inventors
- 👤 Toyomi Akiyama
- 👤 Taiji Higaki
- 👤 Eiichiro Shiratsuchi
- 👤 Yoshiyuki Ishibashi
- 👤 Eijiro Tagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:27
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
295 words
AN ELECTROSTATIC RECORDING MATERIAL OBTAINED BY COATING A BASE SHEET WITH A COMPOSITION COMPRISING (I) 10 TO 90 PARTS BY WEIGHT (AS SOLIDS) OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF A. AN AQUEOUS SOLUTION OF AN AMINE OR AMMONIUM SALT OF A COPOLYMER HAVING A FILM-FORMABILITY AT A TEMPERATURE NOT HIGHER THAN 70*C AND COMPOSED OF A. 8 TO 50 MOLE PERCENT (IN TERMS OF FREE CARBOXYL GROUP) OF CARBOXYL GROUP-CONTAINING ETHYLENICALLY UNSATURATED MONOMER AND B. 92 TO 50 MOLE PERCENT OF AT LEAST ONE MONOMER AND FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER AND B. AN AQUEOUS DISPERSION OF A POLYMER HAVING A FILM-FORMABILITY AT A TEMPERATURE NOT HIGHER THAN 70*C PREPARED BY POLYMERIZING A''. 100 PARTS BY WEIGHT OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER IN THE PRESENCE OF B''. 1 TO 200 PARTS BY WEIGHT (AS SOLIDS) OF AN AQUEOUS SOLUTION OF AN AMINE OR AMMONIUM SALT OF A COPOLYMER COMPOSED OF I. 8 TO 50 MOLE PERCENT (IN TERMS OF FREE CARBOXYL GROUP) OF A CARBOXYL GROUP-CONTAINING ETHYLENICALLY UNSATURATED MONOMER AND II. 92 TO 50 MOLE PERCENT OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER; (II) 90 TO 10 PARTS BY WEIGHT (AS SOLIDS) OF AN AQUEOUS DISPERSION OF A WATER-INSOLUBLE HOMOPOLYMER OR COPOLYMER HAVING NO FILM-FORMABILITY AT A TEMPERATURE NOT HIGHER THAN 70*C AND HAVING A WEIGHT AVERAGE PARTICLE SIZE OF 1 TO 20U PREPARED BY EMULSION OR SUSPENSION-POLYMERIZING AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER IN AN AQUEOUS MEDIUM AND THEN DRYING THE RESULTING ASSEMBLY.
Claim 2
Dependent Claim
295 words
AN ELECTROSTATIC RECORDING MATERIAL OBTAINED BY COATING A BASE SHEET WITH A COMPOSITION COMPRISING (I) 10 TO 90 PARTS BY WEIGHT (AS SOLIDS) OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF A. AN AQUEOUS SOLUTION OF AN AMINE OR AMMONIUM SALT OF A COPOLYMER HAVING A FILM-FORMABILITY AT A TEMPERATURE NOT HIGHER THAN 70*C AND COMPOSED OF A. 8 TO 50 MOLE PERCENT (IN TERMS OF FREE CARBOXYL GROUP) OF CARBOXYL GROUP-CONTAINING ETHYLENICALLY UNSATURATED MONOMER AND B. 92 TO 50 MOLE PERCENT OF AT LEAST ONE MONOMER AND FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER AND B. AN AQUEOUS DISPERSION OF A POLYMER HAVING A FILM-FORMABILITY AT A TEMPERATURE NOT HIGHER THAN 70*C PREPARED BY POLYMERIZING A''. 100 PARTS BY WEIGHT OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER IN THE PRESENCE OF B''. 1 TO 200 PARTS BY WEIGHT (AS SOLIDS) OF AN AQUEOUS SOLUTION OF AN AMINE OR AMMONIUM SALT OF A COPOLYMER COMPOSED OF I. 8 TO 50 MOLE PERCENT (IN TERMS OF FREE CARBOXYL GROUP) OF A CARBOXYL GROUP-CONTAINING ETHYLENICALLY UNSATURATED MONOMER AND II. 92 TO 50 MOLE PERCENT OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER; (II) 90 TO 10 PARTS BY WEIGHT (AS SOLIDS) OF AN AQUEOUS DISPERSION OF A WATER-INSOLUBLE HOMOPOLYMER OR COPOLYMER HAVING NO FILM-FORMABILITY AT A TEMPERATURE NOT HIGHER THAN 70*C AND HAVING A WEIGHT AVERAGE PARTICLE SIZE OF 1 TO 20U PREPARED BY EMULSION OR SUSPENSION-POLYMERIZING AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF AN ETHYLENIC MONOMER AND A CONJUGATED DIOLEFINIC MONOMER IN AN AQUEOUS MEDIUM AND THEN DRYING THE RESULTING ASSEMBLY.
Claim 3
Dependent Claim
23 words
An electrostatic recording material according to claim 1, wherein the amount of the (a) or (i) component is 10 to 45 mole percent.
Claim 4
Dependent Claim
22 words
An electrostatic recording material according to claim 1, wherein the copolymer (A) or the polymer (B) has a film-formability at room temperature.
Claim 5
Dependent Claim
54 words
An electrostatic recording material according to claim 1, wherein the homopolymer or copolymer (II) is prepared by emulsion or suspension-polymerizing at least one monomer selected from the group consisting of vinyl aromatic compounds, alkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group, halogenated vinyl compounds, monoolefins and conjugated diolefins.
Claim 6
Dependent Claim
18 words
An electrostatic recording material according to claim 1, wherein the (II) component is an aqueous dispersion of polystyrene.
Claim 7
Dependent Claim
22 words
An electrostatic recording material according to claim 1, wherein the polymerization is effected in the presence of the (A) or (b'') component.
Claim 8
Dependent Claim
23 words
An electrostatic recording material according to claim 1, wherein the (II) component has a weight average particle size 1 to 5 Mu .
Claim 9
Dependent Claim
22 words
An electrostatic recording material according to claim 1, wherein the amount of the (b'') component is 1 to 30 parts by weight.
Claim 10
Dependent Claim
31 words
An electrostatic recording material according to claim 1, wherein the base sheet is a cellulose fiber paper, a synthetic fiber paper, a synthetic film, a plastic film or a metal foil.
Claim 11
Dependent Claim
57 words
An electrostatic recording material according to claim 1, wherein the ethylenic monomer of (b), (a''), or (ii) is selected from the group consisting of vinyl aromatic compounds, straight or branched olefins, alkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group, polyethylene glycol acrylates and methacrylates, vinyl cyanides, vinyl ethers and vinyl halides.
Claim 12
Dependent Claim
31 words
An electrostatic recording material according to claim 1, wherein the conjugated diolefinic monomer of (b), (a'') or (ii) is selected from the group consisting of butadiene, isoprene, chloroprene, piperylene, and cyclopentadiene.
Claim 13
Dependent Claim
26 words
An electrostatic recording material according to claim 1, wherein the conjugated diolefinic monomer of (II) is selected from the group consisting if isoprene, piperylene and butadiene.
Claim 14
Dependent Claim
24 words
An electrostatic recording material according to claim 1, wherein the carboxyl group-containing ethylenically unsaturated monomer (a) or (i) is an ethylenically unsaturated carboxylic acid.
Claim 15
Dependent Claim
29 words
An electrostatic recording material according to claim 13, wherein the ethylenically unsaturated carboxylic acid is selected from the group consisting of acrylic, mathacrylic, crotonic, itaconic, maleic and fumaric acids.
Claim 16
Dependent Claim
43 words
An electrostatic recording material according to claim 1, wherein the ethylenic monomer of (II) is selected from the group consisting of vinyl aromatic compounds, alkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group, halogenated vinyl compounds, and monoolefins.
Claim 17
Dependent Claim
22 words
An electrostatic recording material according to claim 15, wherein the vinyl aromatic compounds are styrene, Alpha -methylstyrene, halogenated styrenes, vinyltoluene and divinylbenzene.
Claim 18
Dependent Claim
42 words
An electrostatic recording material according to claim 15, wherein the alkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group are methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and lauryl methacrylate.
Claim 19
Dependent Claim
19 words
An electrostatic recording material according to claim 15, wherein the halogenated vinyl compounds are vinyl chloride and vinylidene chloride.
Claim 20
Dependent Claim
13 words
An electrostatic recording material according to claim 15, wherein the monoolefin is isobutylene.
References Cited (Backward Citations)
US2875054A
Cited
US3048501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |