US5032683A
Expired / Lapsed
US
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Glyoxal modified aqueous starch dispersion and method
Assignee: Omnova Services Inc
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Filing: 1989-06-26
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Granted: 1991-07-16
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Expires: 2009-06-26
Abstract
Abstract Modified starch dispersions are prepared by gelatinizing various starches and starch blends and reacting the starch in the presence of a glyoxal compound to produce an aqueous starch dispersion having a storage-stable and coatable viscosity. The starch dispersions provides a film which displays good tensile strength and elongation properties.
Inventors
- 👤 Louis R. Dragner
- 👤 William C. Floyd
- 👤 James W. Ramp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:36
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/003; D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
40 words
A method for producing a stable fluid aqueous modified starch dispersion composition comprising the steps of gelatinizing an aqueous slurry of a starch and reacting the starch with a blocked glyoxal resin compound at temperatures of at least 70° C.
Claim 2
Independent Claim
40 words
A method for producing a stable fluid aqueous modified starch dispersion composition comprising the steps of gelatinizing an aqueous slurry of a starch and reacting the starch with a blocked glyoxal resin compound at temperatures of at least 70° C.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the amount of the glyoxal is within the range of 3 to 30% of the dry weight of the starch.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the starch and glyoxal compound are reacted with a polymer or copolymer of acrylamide.
Claim 5
Dependent Claim
19 words
The method of claim 2 wherein the starch is reacted with the glyoxal compound during gelatinization of the starch.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein the amount of glyoxal compound is within the range of 9 to 20%.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said glyoxal compound is a polyol/glyoxal condensate.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein said glyoxal compound is a cyclic urea/glyoxal condensate.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein said starch comprises a dextrin or a maltodextrin.
Claim 10
Dependent Claim
13 words
The method of claim 1 wherein said starch is an amylose containing starch.
Claim 11
Dependent Claim
17 words
The method of claim 1 wherein said starch comprises a hydroxyethylated starch and a maltodextrin or dextrin.
Claim 12
Dependent Claim
13 words
The method of claim 10 wherein said hydroxyethylated starch is acid-modified or oxidized.
Claim 13
Dependent Claim
46 words
A stable fluid aqueous modified starch dispersion composition comprising an aqueous dispersion of starch wherein the starch has been gelatinized and reacted at temperatures above 70° C. in the presence of 3 to 30% of a blocked glyoxal resin compound by dry weight of the starch.
Claim 14
Dependent Claim
46 words
A stable fluid aqueous modified starch dispersion composition comprising an aqueous dispersion of starch wherein the starch has been gelatinized and reacted at temperatures above 70° C. in the presence of 3 to 30% of a blocked glyoxal resin compound by dry weight of the starch.
Claim 15
Dependent Claim
16 words
The starch composition of claim 12 wherein said blocked glyoxal resin is a cyclic urea/glyoxal condensate.
Claim 16
Dependent Claim
13 words
The starch composition of claim 12 wherein said starch comprises dextrin or maltodextrin.
Claim 17
Dependent Claim
14 words
The starch composition of claim 12 wherein said starch is an amylose containing starch.
Claim 18
Dependent Claim
19 words
The starch composition of claim 12 wherein said starch-containing composition comprises a hydroxyethylated starch and a maltodextrin or dextrin.
Claim 19
Dependent Claim
16 words
The starch composition of claim 16 wherein said hydroxyethylated starch is an acid-modified or oxidized starch.
Claim 20
Dependent Claim
19 words
The starch composition of claim 12 wherein the glyoxal compound is added at a level of 9 to 20%.
Claim 21
Dependent Claim
50 words
The starch composition of claim 12 wherein said starch is selected from the group consisting of dextrin, maltodextrin, hydroxyethylated potato starch, cationic potato starch, acid modified corn starch, hydroxylated corn starch, acid modified corn starch, oxidized corn starch, waxy corn starch enzyme modified corn starch and mixtures of the foregoing.
Claim 22
Dependent Claim
22 words
The starch composition of claim 12 further comprising a polymer or copolymer of acrylamide which is reacted with the starch and glyoxal.
Claim 23
Dependent Claim
13 words
The starch composition of claim 12 wherein said starch is a waxy starch.
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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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |