Allied Chemical Corporation

Allied Corporation

Kalidas Chakravarti

Stanley D Lazarus

Hugh H Rowan

James G Neal

A process for the production of reinforced rubber articles formed from polyester yarn embedded into rubber stock is disclosed. The process comprises the steps of: (1) treating the yarn with a finish composition which comprises water and a silane having the structural formula: ##STR1## wherein n=2 to 5, and (2) including from about 2 to 50 parts, per hundred parts of rubber, of silica particles in the rubber stock. The reinforced rubber article is preferably a pneumatic passenger tire which has excellent adhesion of tire cord to rubber.

Process for the production of reinforced rubber articles

A fiber finish composition, a process which includes treating polyester yarn therewith and polyester yarn so treated are all disclosed. The fiber finish composition comprises a triglycidyl ether of glycerol; a low viscosity diglycidyl ether having the structural formula ##STR1## wherein R is alkylene or arylene; ethoxylated castor oil; an epoxy silane having the structural formula ##STR2## wherein n=2 to 5; and a solvent. The process comprises the steps of (1) heating the yarn to a temperature of about 150.degree. C. to 230.degree. C. and (2) treating the yarn with the fiber finish composition, preferably utilized as an aqueous overfinish. The yarn is preferably used in tire cords for the construction of pneumatic passenger tires and results in excellent adhesion of tire cord to rubber.

Process and finish composition for producing adhesive active polyester

High molecular weight linear condensation polyesters are stabilized against deterioration by heat by reacting the polyester in molten form with certain polycarbonates in the presence of a catalytic amount of a phosphonium compound selected from the group consisting of tetra-n-alkylphosphonium acetates and tetra-n-alkylphosphonium halides. For the purpose of this disclosure, polycarbonates are defined as linear polyesters of carbonic acid in which the carbonate groups recur in the polymer chain. In continuous production of the improved polyesters, it is preferred that the polycarbonate and catalyst be added to the process stream with mixing at a point to give 2 to 15 minutes reaction time under superatmospheric pressure before the polyester enters the last polycondensation reactor.

Production of thermally stabilized polyester

High molecular weight linear condensation polyesters are stabilized against deterioration by heat by reacting the polyester in molten form with an epoxy compound having 5 to 25 carbon atoms in the molecule and selected from the group consisting of ##STR1## where R represents the radical remaining after removal of the carboxyl group from a monocarboxylic acid, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent hydrogen or hydrocarbon radicals, and n is an integer that can be 0 to 3.

High molecular weight linear condensation polyesters are stabilized against deterioration by heat with a stabilizer comprising an N-epoxyalkyl imide of a dicarboxylic acid, having 5 to 20 carbon atoms in the imide molecule and composed of carbon, hydrogen, carbonyl and epoxy oxygen, and imide nitrogen atoms, said epoxy oxygen being linked to adjacent carbon atoms.

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Richmond, VA, United States of America

Kalidas Chakravarti