Stabilizing agents calcium stearate

A minimum temperature of 88°C is required for paste storage of thermally oxidized starch in order to prevent retrogradation. Various retrogradation control agents have been recommended for stabilizing. The addition of 0.5 to 1.0% calcium stearate prevents the build up of viscosity, but could actually lead to the precipitation of amylose due to gradual stearate dissolution (ionization) and complex formation with... 

Calcium stearate is also employed as an emulsifier, stabilizing agent, and suspending agent, and is also used in cosmetics and food products. 

Dispersions of molten Na (d. at 100°C, 0.928) in inert liquids containing about 50% metallic Na (particle size 1-20 millimicrons) can be prepared in the laboratory by mechanical dispersion. The boiling point of the inert liquid must be higher than the melting point of Na (97.5°C). Such liquids include toluene, xylene, some light mineral spirits, kerosene, heptane, n-octane, mineral oil, and naphthalene. Appropriate agents (0.25-1%) contribute to the reduction of particle size (soot, copper powder, pyridine, etc.) or stabilize the dispersion (oleic acid, aluminum stearate, calcium stearate, etc.). 

Incorporation of 0.1—4% zeolites 13X, 5A, 4A, lOX, XW and ala) natural zeolites and synthetic pdyn rs (polystyrene, vinyl chloride-vinyl acetate copolymer, poly propylene, acrylonitrile, butadiene styrene copolymer, poly (methyl methacrylate or polyetl lene) containing 0.1-4% antistatic agent improves antistatic properties. However tire zeolites alone fail to do so In another instance a composition of polyvinylchloride 100, dioctylthalate 80, stabilizer 2, Pd-stearate-1, and zeolite 100 parts is rolled at 160 ° and pressed to give a white sheet having surface resistivity 3.8 x 10 ohm-cm coitq>ared with 1.5 X 10 ohm-cm for a similar sheet containing calcium carbonate in place of zedite, vdiich reflects the definite role of these zeolites in improving the antistatic properties of the composition. 

Substituted phenols that act as scavengers for radicals formed in the course of the degradation reaction as well as thio compounds and organophosphites are added as antioxidants. Benzophenone and carbon black act as UV stabilizers. Calcium stearate or other carboxylic acids are added to bind chloride originating from the catalyst. Further additives can be acceptors for coloring, anti-electrostatics, nucleating agents to promote crystallization, lubricants, or flame retardants [507,508]. Polypropene can also be blended with other polymers as rubbers (EPDM) or polyethene [509-511]. In these products the... 

Calcium stearate is commonly added into chlorobutyl compound as a stabilizer and scorch safety agent to neutralize any possible trace of acid formed in degradation reaction... 

Uses Acid neutralizer/acceptor/scavengerfor polyolefins lubricant for PVC, polyolefins, filled compds. dough strengthened emulsifier, processing aid, surfactant, stabilizer, formulation aid, whipping agent, conditioner in foods Features Contains no milk protein Trade Names Pationic 925 Calcium stearate... 

Antiblocking additives are frequently added to PVC in concentrations larger than required for their antiblocking action because they also perform other functions, such as surface matting and plasticizer absorption. Also, stearates of zinc and calcium are added in larger than required quantity to perform as slip agents, because they are also thermal stabilizers. 

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