US3869296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous starch-pigment paper coating compositions containing glyoxal-urea insolubilizer
Assignee: Union Carbide Corp
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Filing: 1973-06-20
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Granted: 1975-03-04
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Expires: 1993-06-20
Abstract
Abstract Paper coating compositions are provided containing a pigment, starch as binder for the pigment and a latent water insolubilizing agent for the binder. Exemplary of these compositions is a fluid dispersion of clay in aqueous medium containing starch as pigment binder and from about 2 to 10 percent based on the weight of the starch of a latent insolubilizer for the starch. Said latent insolubilizer being the reaction product of urea and glyoxal at a mole ratio of from about 0.5 to about 0.75 mole of urea to 1.0 mole of glyoxal. These compositions cure at low temperatures, are stable, and provide coatings which possess high wet-rub resistance.
Inventors
- 👤 Jr George Bernard Kelly
- 👤 Robert Howard Lowery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:23
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/54; C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C08K; C08K3/00; C08L; C08L3/00; C08L61/00; C08L61/20; C08L61/22; C08L61/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A PAPER COATING COMPOSITION OF A PIGMENT, STARCH AND A LATENT WATER INSOLUBILIZER FOR SAID STARCH, SAID LATENT WATER INSOLUBILIZER BEING THE REACTION PRODUCT OF FROM 0.5 TO 0.75 MOLE OF UREA PER MOLE OF GLYOXAL AND HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 250 TO 325, AND BEING PRESENT IN SAID COMPOSITION AT A CONCENTRATION OF FROM 2 TO 10 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE STARCH.
Claim 2
Dependent Claim
71 words
A PAPER COATING COMPOSITION OF A PIGMENT, STARCH AND A LATENT WATER INSOLUBILIZER FOR SAID STARCH, SAID LATENT WATER INSOLUBILIZER BEING THE REACTION PRODUCT OF FROM 0.5 TO 0.75 MOLE OF UREA PER MOLE OF GLYOXAL AND HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 250 TO 325, AND BEING PRESENT IN SAID COMPOSITION AT A CONCENTRATION OF FROM 2 TO 10 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE STARCH.
Claim 3
Dependent Claim
22 words
A composition as claimed in claim 1, wherein the mole ratio is from 0.5 to 0.6 mole urea per mole of glyoxal.
Claim 4
Dependent Claim
32 words
A composition as claimed in claim 1, wherein said latent water insolubilizer is present at a concentration of from 3 to 7 percent by weight based on the weight of the starch.
Claim 5
Dependent Claim
32 words
A composition as claimed in claim 2, wherein said latent water insolubilizer is present at a concentration of from 3 to 7 percent by weight based on the weight of the starch.
Claim 6
Dependent Claim
18 words
A composition comprising a cellulosic substrate coated with the heat cured paper coating composition claimed in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |