C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1300, 117/65
C08L 3/04 (2006.01) C08B 31/16 (2006.01) C08L 9/08 (2006.01) D21H 19/54 (2006.01)
Patent
CA 1047184
ABSTRACT OF THE DISCLOSURE An alkali-stable, modified starch for use in paper coating binders as a replacement for protein (casein and delta protein) over a broad pH ranging from 6 to about 9.5, when ammonia is used to adjust pH. A cationic starch derivative having quaternary ammonium groups is reacted with maleic anhydride to yield an amphoteric starch having a net anionic charge. This product insolubilizes with conventional starch insolubilizers, such as melamine formaldehyde resin, at pH of 6 and higher to produce wet-rub resistant coatings when formulated with clay and coated on paper and paperboard substrates. Crosslinking is effected rapidly to produce complete insolubilization, especially when used with a minimum of 50% latex as a binder. Maleic anhydride provides anionic properties to the cationic starch molecule to yield an amphoteric starch with a net anionic charge. Maleic anhydride is used because the starch so produced is capable of self-crosslinking at high pHs to produce insolubilized coatings resistant to water. Crosslinking is effected by drying the paste films without the use of a catalyst. When alkaline conditions are required such as when using alkali-swellable latex, pH adjustments are made with ammonia, which flashes off during insolubilization. The maleated starches self-crosslink and insolubilize at high pH levels, and become immobile before water is completely removed. The rapid insolubilization minimizes binder migration.
213217
A.e. Staley Manufacturing Company
Na
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