Degraded hydrophobic particulate starches and their use in...

C - Chemistry – Metallurgy – 08 – B

Patent

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Details

C08B 31/04 (2006.01) C08B 31/00 (2006.01) C08B 31/08 (2006.01) C08L 1/28 (2006.01) C08L 3/04 (2006.01) C08L 5/00 (2006.01) C08L 29/04 (2006.01) D21H 17/28 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2326817

This invention is directed to degraded, hydrated particulate starches that are hydrophobically modified and a method of providing paper with reduced porosity, resistance to liquid penetration and increased surface strength comprising applying to the surface of a paper substrate an effective amount of a surface sizing composition which comprises such starch. In particular, the starches are those in which the starch base is degraded to a water fluidity (WF) of from about 10 to 80 or the modified and/or particulate starch is degraded using a substantially equivalent amount of degradation agent and substantially the same reaction conditions, the starch is modified with a hydrophobic hydrocarbon group of 5 to 23 carbon atoms at about 1 to 20% substitution level by weight of bound hydrophobe based on the weight of starch, and the hydrated starch has a volume average hydrated particle size of at least about 20 microns and a volume fraction of hydrated particles at 1% solids of at least about 5%.

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