Sugar – starch – and carbohydrates – Products – Miscellaneous
Patent
1975-07-02
1976-12-07
Wolk, Morris O.
Sugar, starch, and carbohydrates
Products
Miscellaneous
106 22, 106210, 106308C, 127 32, 127 33, 127 70, 127 71, 252316, 536106, 282 275, 428306, 428307, 428323, 428327, B01J 1300, C13L 108, D21H 328
Patent
active
039960617
ABSTRACT:
Large diameter legume starch granules including starches derived from yellow field pea, Pisum sativum (var) and faba bean, Vicia faba L. (Leguminosae) which have been treated to remove protein and fiber, and to improve color are used to replace scarce arrowroot starch granules as a protective stilt material in microencapsulated coatings, including carbonless copy paper. The "stilt" material is used to prevent premature rupture of the microcapsules and early release of the microencapsulated materials. It has been discovered that the natural granule size, and other granule properties of the yellow field pea and faba bean starches are ideally suited to replace arrowroot starch granules as a protective material when the naturally occurring protein and fiber have been removed, and the color improved.
In certain coating processes in which the temperature at the coated surface exceeds the normal pasting temperature of these starch granules, the pasting temperature of the granules can be raised by a crosslinking reaction under temperature and pH conditions to preserve the granular structure of the starch particles. A polyfunctional crosslinking agent, such as epichlorohydrin, phosphorus oxychloride, sodium trimetaphosphate, acrolein, or urea formaldehyde can be used. Under high alkaline conditions, using phosphorus oxychloride in a stepwise reaction procedure, it is possible to increase the pasting temperature of the starch granules by more than 25.degree. F.
These fiber and protein free, large diameter legume starch particles may also be used for other purposes, such as for anti-offset powders in lithography, either with or without crosslinking or other derivatization to further improve chemical and physical properties. These starches are also useful an absorbable dusting powders. The large granule starches derived from most varieties of peas and beans can be used in the same manner.
REFERENCES:
patent: 3825467 (1974-07-01), Phillips, Jr.
"Starch: Chem. & Tech.", R. L. Whistler et al., eds., vol. I, 75, 81, Academic Press, New York, 1965.
J. A. Radley, "Starch and Its Derivatives", vol. II, 328-329, 330-331, John Wiley & Sons, New York, 1954.
A. E. Staley Manufacturing Company
Barnett Howard J.
Marantz Sidney
Meyerson Charles J.
Wolk Morris O.
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