B - Operations – Transporting – 41 – L
Patent
B - Operations, Transporting
41
L
42/10, 260/220,
B41L 1/16 (2006.01) C13L 1/00 (1980.01)
Patent
CA 1050015
ABSTRACT OF THE DISCLOSURE 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 micro- encapsulated 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 agent, such as epichlorohydrin, phosphorus oxychloride, sodium trimetaphosphate, acrolein, or urea-formaldhyde 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°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 as absorbable dusting powders. The large granule starches derived from most varieties of peas and beans can be used in the same manner.
231345
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