Contact Agents Process

Uses Emollient emulsifier, stabilizer, dispersant, opacifier for cosmetics, foods, and pharmaceuticals dispersant, mold release agent, processing aid, antistat, antifog, lubricant, antiblocking agent for PS, polyolefins, PVC, PU defoamer in food-contact paper/paperboard in food-con-tact textiles... 

Uses Emulsifier, stabilizer, detergent, wetting agent, dispersant, foaming agent for polymerization of ABS, SBR, other elastomers, metalworking and drilling oils, adhesives in food-pkg. adhesives component of food-contact articles process/polymerization aid... 

In 1958, Loucks at al. described the use of citric acid as a cleaning agent. Reich developed a formulation for removing iron oxide from steel surfaces that consisted of a mixture of citric acid and formic acid. He claimed that the mixture of the two acids would hold more iron in solution than either of the acids alone. Citric acid used alone precipitated iron after several hours of contact. A process for cleaning iron oxide and copperfrom utility boilers was described by Alfano. This method uses monoammo-nium citrate at pH values between 3 and 5 to remove the iron oxide. The ammonium citrate solved the precipitation problems encountered with the use of citric acid alone. The pH is then raised to 9 with ammonia or an amine, and an oxidizer is introduced. The oxidizer dissolves the copper. The iron oxide removal stage is conducted at 150°F... 

To decrease the friction of films in contact with processing and conversion equipment, a lubricating agent known as a slip agent is added. Slip agents migrate to the surface and reduce the coefficient of friction, allowing for faster line speeds (lubrication). Primary amides, secondary amides, and ethylene... 

Other methods have been developed for speeding up the contact moulding process and these include heat assisted cure, either by the use of low temperature ovens or even by incorporating heating elements into the mould surface. Special systems have been developed to reduce or eliminate the need for regular use of release agents on moulds. 

Uses Detergent corrosion inhibitor emulsifier antistat intermediate for quat. ammonium compds., amine oxides, betaines for household prods. disinfectanls sanitizers industrial hand cleaners cosmetics polymer additives catalyst for PU foam, food-contact PU resins epoxy curing agent processing aid for metal and textiles bactericide precursor in pharmaceuticals vise, index improver for lubricating oils... 

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