US4115327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic resin color developing compositions for copying papers and methods of preparation
Assignee: Sumitomo Durez Co Ltd
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Filing: 1977-06-21
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Granted: 1978-09-19
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Expires: 1997-06-21
Abstract
Abstract Improved aqueous color developing compositions for copying papers are prepared by emulsifying phenolic resins having relatively low molecular weights. The aqueous emulsions are prepared by condensing a phenol and an aldehyde in the presence of an acid catalyst, and without the customary steps of high temperature concentration or dry pulverization of the solid resin the precondensate is directly emulsified with starch or other emulsifiers while in a liquid state. Uniformity of resin particle size is achieved by accelerated agitation of the precondensate. The process provides stable emulsions with fine resin particles having a diameter of under about 7 microns, which excel in color developing properties, fastness to light and have extended shelf life.
Inventors
- 👤 Toyoji Kikuga
- 👤 Koji Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:50
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/24; C08J2361/00; C08J2361/04; C08J2361/06; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
A method of preparing color developing emulsion compositions for copying papers without dry pulverization consisting essentially of: (a) condensing a reaction mixture consisting essentially of an aldehyde and at least one phenol to provide a phenolaldehyde novolac precondensate having an average of from 2 to 6 phenolic nuclei per molecule, (b) with agitation means directly emulsifying the resin precondensate of (a) while in a liquid state with the addition of from 1 to 10% by weight of an emulsifier to provide resin particles having a diameter of under about 7 microns, and (c) adjusting the size of the emulsified particles by treatment of the emulsion with wet pulverizing means; said emulsion composition having a solids content range of phenolic resin from about 20 to about 80 percent by weight.
Claim 2
Independent Claim
129 words
A method of preparing color developing emulsion compositions for copying papers without dry pulverization consisting essentially of: (a) condensing a reaction mixture consisting essentially of an aldehyde and at least one phenol to provide a phenolaldehyde novolac precondensate having an average of from 2 to 6 phenolic nuclei per molecule, (b) with agitation means directly emulsifying the resin precondensate of (a) while in a liquid state with the addition of from 1 to 10% by weight of an emulsifier to provide resin particles having a diameter of under about 7 microns, and (c) adjusting the size of the emulsified particles by treatment of the emulsion with wet pulverizing means; said emulsion composition having a solids content range of phenolic resin from about 20 to about 80 percent by weight.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the condensation reaction is conducted in the presence of an acid catalyst.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein the phenol and aldehyde are converted to a resole in the presence of an alkaline catalyst, neutralized with an acid and condensed to provide a novolac-type resin.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the emulsifying agent is starch.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the emulsifying agent is a surfactant selected from the group consisting of anionic and non-ionic surface active agents.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the emulsifying agent is a protective colloid.
Claim 8
Dependent Claim
10 words
The product made according to the method of claim 1.
Claim 9
Dependent Claim
10 words
The product made according to the method of claim 2.
Claim 10
Dependent Claim
10 words
The product made according to the method of claim 3.
Claim 11
Dependent Claim
10 words
The product made according to the method of clam 4.
Claim 12
Dependent Claim
10 words
The product made according to the method of clam 4.
Claim 13
Dependent Claim
24 words
The method of claim 1 wherein the emulsifier is a material selected from the goup consisting of starch, surfactant, protective colloid and mixtures thereof.
References Cited (Backward Citations)
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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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |