US4268595A
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US
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Electrostatic recording material and method for the production thereof
Assignee: Canon Inc
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Filing: 1979-11-05
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Granted: 1981-05-19
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Expires: 1999-11-05
Abstract
Abstract An electrostatic recording material comprising a support having formed thereon a dielectric layer composed of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein monomer (b) and monomer (c) are different and at least one of the monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, and a method for producing an electrostatic recording material, which comprises converting such a terpolymer to a water-soluble or water-emulsifiable salt of the terpolymer in which about 20 to 100 mol% of the carboxyl groups present form a salt with ammonia and/or a volatile amine, dissolving or dispersing the terpolymer salt in water, coating the resulting solution or dispersion onto a support, and drying the coating to volatilize the ammonia and/or volatile amine.
Inventors
- 👤 Kazuharu Katagiri
- 👤 Shozo Ishikawa
- 👤 Shigeto Ohta
- 👤 Makoto Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31935
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
179 words
An electrostatic recording material comprising a support having thereon a dielectric layer consisting essentially of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mol % (a) and 30-90 mol % (b) plus (c).
Claim 2
Dependent Claim
179 words
An electrostatic recording material comprising a support having thereon a dielectric layer consisting essentially of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mol % (a) and 30-90 mol % (b) plus (c).
Claim 3
Dependent Claim
19 words
The electrostatic recording material of claim 1, wherein the dielectric layer contains particulate material which reduces the gloss thereof.
Claim 4
Dependent Claim
20 words
The electrostatic recording material of claim 2, wherein the particulate material is colloidal silica, titanium oxide, calcium carbonate or clay.
Claim 5
Dependent Claim
30 words
The electrostatic recording material of claim 1, wherein the dielectric layer further contains at least one polymer selected from the group consisting of a styrene/butadiene copolymer and polystyrene blended therein.
Claim 6
Dependent Claim
36 words
The electrostatic recording material of claim 1, wherein said dielectric layer further contains an aqueous polymer other than said terpolymer in an amount of up to 40 weight % based on the amount of said terpolymer.
Claim 7
Dependent Claim
20 words
The electrostatic recording material of claim 1, wherein the number average molecular weight of said terpolymer is 2,000 to 400,000.
Claim 8
Dependent Claim
33 words
The electrostatic recording material of claim 1, wherein said terpolymer contains methacrylic acid in an amount of 10 to 70 mol % based on the total number of monomer units within the terpolymer.
Claim 9
Dependent Claim
186 words
An electrostatic recording material comprising a support having thereon a dielectric layer consisting essentially of a resin component, said resin component consisting essentially of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group, and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mol% (a) and 30-90 mol% (b) plus (c).
Claim 10
Dependent Claim
186 words
An electrostatic recording material comprising a support having thereon a dielectric layer consisting essentially of a resin component, said resin component consisting essentially of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group, and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mol% (a) and 30-90 mol% (b) plus (c).
Claim 11
Dependent Claim
30 words
The electrostatic recording material of claim 8, wherein said resin component consists essentially of said terpolymer and wherein said dielectric layer further contains an aqueous polymer other than said terpolymer.
Claim 12
Dependent Claim
15 words
The electrostatic recording material of claim 8, wherein said resin component consists of said terpolymer.
Claim 13
Dependent Claim
28 words
The electrostatic recording material of claim 8, wherein said resin component consists of said terpolymer and said dielectric layer additionally contains an aqueous polymer other than said terpolymer.
Claim 14
Independent Claim
229 words
A method for producing an electrostatic recording material which comprises dissolving or dispersing in water a water-soluble or water-emulsifiable salt of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group, and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mole% (a) and 30-90 mol% (b) plus (c) in which about 20 to 100 mol% of the carboxyl groups present are in the form of a salt with ammonia and/or a volatile amine; coating the resulting solution of dispersion onto a support; and drying the resulting coating to volatilize the ammonia and/or volatile amine.
Claim 15
Independent Claim
229 words
A method for producing an electrostatic recording material which comprises dissolving or dispersing in water a water-soluble or water-emulsifiable salt of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group, and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mole% (a) and 30-90 mol% (b) plus (c) in which about 20 to 100 mol% of the carboxyl groups present are in the form of a salt with ammonia and/or a volatile amine; coating the resulting solution of dispersion onto a support; and drying the resulting coating to volatilize the ammonia and/or volatile amine.
Claim 16
Dependent Claim
28 words
The method of claim 12, wherein the volatile amine is an alkylamine containing 1 to 4 carbon atoms and/or an alkanolamine containing 1 to 4 carbon atoms. PG,42
Claim 17
Independent Claim
201 words
A method for producing an electrostatic recording material which comprises dissolving or dispersing in water a resin component, said resin component consisting of a water-soluble or water-emulsifiable salt of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group, and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mol % (a) and 30-90 mol % (b) plus (c) and an aqueous polymer other than said terpolymer.
Claim 18
Independent Claim
201 words
A method for producing an electrostatic recording material which comprises dissolving or dispersing in water a resin component, said resin component consisting of a water-soluble or water-emulsifiable salt of a terpolymer consisting of (a) methacrylic acid, (b) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, and (c) a monomer selected from the group consisting of (1) acrylic acid esters containing at least 4 carbon atoms and (2) methacrylic acid esters containing at least 5 carbon atoms, wherein said monomer (b) and said monomer (c) are different and at least one of said monomers (b) and (c) is an acrylic acid ester containing at least 11 carbon atoms or a methacrylic acid ester containing at least 8 carbon atoms, wherein said acrylic acid esters and methacrylic acid esters are esters of alcohols selected from the group consisting of aliphatic alcohols, aromatic alcohols and alcohols containing an aralkyl group, and wherein the proportion of (a) to the total of (b) and (c) is 10-70 mol % (a) and 30-90 mol % (b) plus (c) and an aqueous polymer other than said terpolymer.
Claim 19
Dependent Claim
31 words
An electrostatic recording process which comprises electrostatically forming a latent image on the electrostatic recording material of claim 1 and thereafter developing said electrostatic latent image to form a visible image.
Claim 20
Dependent Claim
21 words
The electrostatic recording material of claim 1, wherein the molar ratio of monomer (b) to monomer (c) is 1:3 to 4:1.
Claim 21
Dependent Claim
21 words
The electrostatic recording material of claim 8, wherein the molar ratio of monomer (b) to monomer (c) is 1:3 to 4:1.
Claim 22
Dependent Claim
19 words
The method of claim 12, wherein the molar ratio of monomer (b) to monomer (c) is 1:3 to 4:1.
Claim 23
Dependent Claim
19 words
The method of claim 14, wherein the molar ratio of monomer (b) to monomer (c) is 1:3 to 4:1.
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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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |