Patent EP0965301A1 successfully refreshed from Google Patents.
US3674726A
Expired / Lapsed
US
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Paper coating composition coagulatable by heating
Assignee: Warren SD Co
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Filing: 1970-09-04
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Granted: 1972-07-04
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Expires: 1990-09-04
Abstract
Abstract A paper coating composition which is fluid at 25* C. but coagulates or flocculates when heated to an elevated temperature comprising an aqueous slurry of a conventional mineral pigment and adhesive binder which slurry contains an ionic dispersant for the pigment, the efficiency of which does not change appreciably with heating, and a counteracting agent for the dispersant that is relatively insoluble at 25* C. but solubilizes at an elevated temperature in the range of 35* to 100* C. sufficiently to counteract the dispersant and cause the composition to coagulate or flocculate.
Inventors
- 👤 Mahlon Randall Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:47
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/46; D21H19/52; D21H19/54; D21H19/64
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The composition of claim 1 wherein said dispersant is anionic and said counteracting agent is cationic.
Claim 2
Dependent Claim
17 words
The composition of claim 1 wherein said dispersant is anionic and said counteracting agent is an acid.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein said dispersant is cationic and said counteracting agent is anionic.
Claim 4
Dependent Claim
142 words
An improved heat coagulatable paper coating composition comprising an aqueous slurry having a total solids content of at least 30 weight percent and containing a paper-coating-grade mineral pigment, an adhesive binder, an ionic dispersant for said pigment selected from the group consisting of tetrasodium pyrophosphate, sodium hexametaphosphate, sodium tripolyphosphate, carboxymethylcellulose and polyethyleneimine and a counteracting agent that is relatively insoluble in water at 25* C. but solubilized at a temperature of from 35* to 100* C. selected from the group consisting of cationic starch, carboxymethylated starch, aluminum citrate, aluminum tartrate, cesium alum and metatoluic acid; said ionic dispersant being employed in an amount sufficient to stably disperse said pigment at a temperature of from 35* to 100* C. in the absence of any counteracting agent and said counteracting agent being employed in an amount sufficient to counteract the charge of the dispersant.
Claim 5
Dependent Claim
45 words
The improved heat coagulatable paper coating composition claimed in claim 5 wherein the ionic dispersant is employed in an amount sufficient to disperse the pigment to the same degree as 0.4 parts by weight of tetrasodiumpyrophosphate per 100 parts by weight of undispersed coating clay.
Claim 6
Dependent Claim
38 words
The composition according to claim 1 wherein the counteracting agent possesses a solubility of less than 2.5 X 10 2 grams per gram of water at 30* C. and a solubility at least tenfold greater at 100* C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |