D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/28 (2006.01)
Patent
CA 2211372
Thermally-inhibited starches and flours, preferably cationic or amphoteric starches which are optionally chemically crosslinked, are added, primarily as wet end additives, to paper stock. The starch or flour is inhibited by dehydrating to anhydrous or substantailly anhydrous and then heat treating the dehydrated starch or flour for a time and at a temperature sufficient to inhibit the starch or flour and improve its viscosity stability when dispersed in water. The dehydration may be a termal or non-thermal dehydration (e.g., by alcohol extraction or freeze-drying). Preferably, the pH of the starch or flour is adjusted to neutral or above prior to dehydration.
On incorpore à un raffiné des amidons et des farines inhibés thermiquement, de préférence des amidons cationiques ou amphotères éventuellement chimiquement réticulés, et faisant principalement office d'additifs finaux humides. On inhibe l'amidon ou la farine en les déshydratant pour obtenir un produit anhydre ou déshydraté puis en traitant l'amidon ou la farine déshydraté(e) pendant une période et une température suffisantes pour inhiber l'amidon ou la farine et augmenter la stabilité de sa viscosité une fois dispersé(e) dans l'eau. La déshydratation peut être thermique ou non (exemple, par extraction à l'alcool ou lyophilisation). Le pH de l'amidon ou de la farine est, de préférence, de zéro ou plus avant la déshydratation.
Chiu Chung-Wai
Jeffcoat Roger
Koltai Kimberly A.
Schiermeyer Eleanor
Shah Manish B.
Borden Ladner Gervais Llp
National Starch And Chemical Investment Holding Corporation
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