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Starch-containing systems

Polydrill is a sulfonated polymer for filtration control in water-based drilling fluids [1775]. Tests demonstrated the product s thermal stability up to 200° C and its outstanding electrolyte tolerance. Polydrill can be used in NaCl-saturated drilling fluids as well as in muds containing 75,000 ppm of calcium or 100,000 ppm of magnesium. A combination of starch with Poly drill was used successfully in drilling several wells. The deepest hole was drilled with 11 to 22 kg/m of pregelatinized starch and 2.5 to 5.5 kg/m of Polydrill to a depth of 4800 m. Field experience with the calcium-tolerant starch/Polydrill system useful up to 145° C has been discussed in detail [1774]. [Pg.38]

Slow but significant progress is visible in this area. For example, potato starch (containing 27 % amylase and 73 % amylopectin) can be oxidized to superabsorbing biopolymers. The three-component system H202/HBr/CH3Re03 works in the formation of carboxylated starch according to the mechanism proposed in Scheme 10 [104],... [Pg.1362]

Cationic potato starch was found to be significantly superior in performance to other starches in systems containing alum. Vander Burgh [11] claimed that in alum-containing papers cationic potato starch was twice as effective as cationic... [Pg.183]

The combination of starch with a water-soluble pol5mier such as poly(vinyl alcohol) (PVOH) and/or polyalkylene glycols has been widely considered since 1970 (151). More recently, the thermoplastic starch/PVOH system has been mainly studied for producing starch-based loose fillers as a substitute for expanded polystyrene (152-158). As an example, Altieri and Lacoin-se developed a technology based on hydroxy propylated high amylose starch containing small amounts of... [Pg.7808]

Glittenberg D, Hemmes JL, Bergh NO (1993) Synergism between synthetic agents and cationic starches in wood-containing systems. Wochenbl Papierfabrikat 121 1000... [Pg.62]

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Containment system

Starch systems

System containing

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