Process for obtaining granular forms of additives for organic polymers
AssigneeGreat Lakes Chemical Italia S.r.l.
InventorsCarlo Neri, Luciano Pallini
Life of this patent
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Abstract
Process for obtaining granular forms, from mixtures of powders of two or more additives for organic polymers, including extruding the mixture at a temperature of between about the melting point of the component with the lowest melting point and 140.degree. C., with the condition that, when the mixture consists of two additives, these are not tetrakis 3-(3,5-di-t-butyl-4-hydroxyphenyl) propionyloxymethyl!methane, either in an amorphous or crystalline form, and an antiacid.
Claims5
Process for obtaining pelletized forms, from powder mixtures of two or more additives for organic polymers in the absence of binders, which includes extruding the mixture at a temperature of between the melting point of the component with the lowest melting point and 140.degree. C., with the condition that the extrusion temperature is below the melting point of at least one of the two or more additives and with the condition that, when the mixture consists of two additives, these are not tetrakis 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyl oxymethyl!methane, either in an amorphous or crystalline form, and an antacid.
Process for obtaining pelletized forms, from mixtures of two or more additives for organic polymers in the absence of binders, which includes extruding the mixture at a temperature of between the melting point of the component with the lowest melting point and 140.degree. C., cooling the extrudate to room temperature and cutting the extrudate into pellets, with the condition that, when the mixture consists of two additives these are not tetrakis3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl!methane, either in amorphous or crystalline form, and an antiacid.
Dependencies are inferred from the claim text.