Polymerization process for preparing lubricant additives and products

Claim 2

IN A PROCESS FOR THE PREPARATION OF POUR POINT DEPRESSANT MATERIALS BY THE COPOLYMERIZATION OF ALPHA-BETA UNSATURATED DICARBOXYLIC ACID ESTERS OF A MIXTURE OF ALCOHOLS, SAID ALCOHOLS CONTAINING FROM 8 TO 18 CARBON ATOMS PER MOLECULE, SAID ALCOHOL MIXTURE HAVING AN AVERAGE OF FROM 12 TO 14 CARBON ATOMS, WITH POLYMERIZABLE VINYL ESTERS OF LOWER ALKANOIC ACID, IN THE PRESENCE OF AN INERT SOLVENT, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF ADMIXING THE MONOMERS IN SAID SOLVENT, HEATING THE MIXTURE TO A COPOLYMERIZATION TEMPERATURE IN THE PRESENCE OF A PEROXIDE CATALYST, INTRODUCING SUFFICIENT OXYGEN-CONTAINING GAS INTO THE REACTION MIXTURE SO AS TO MAINTAIN THE REACTION TEMPERATURE NEAR THE EQUILIBRIUM TEMPERATURE FOR THE DESIRED PERIOD OF TIME, TO THEREBY OBTAIN A COPOLYMERIC MATERIAL HAVING OUTSTANDING POUR DEPRESSING POTENCY.

Claim 3

A LUBRICATING OIL ADDITIVE MATERIAL HAVING THE DESIRABLE CHARACTERISTIC OF IMPROVING THE POUR POINT OF WAXY MINERAL LUBRICATING OIL INTO WHICH IT HAS BEEN INCORPORATED CONSISTING ESSENTIALLY OF A COPOLYMER OF FROM 75% TO 90% OF AN ALPHA-BETA UNSATURATED DICARBOXYLIC ACID ESTER OF A MIXTURE OF ALCOHOLS, SAID ALCOHOLS CONTAINING FROM 8 TO 18 CARBON ATOMS PER MOLECULE, SAID MIXTURE OF ALCOHOLS HAVING AN AVERAGE OF FROM 12 TO 14 CARBON ATOM, WITH FROM 10% TO 25% OF VINYL ACETABLE WHICH HAS BEEN PREPARED BY A PROCESS COMPRISING THE STEPS OF ADMIXING THE MONOMERS IN AN INERT SOLVENT, HEATING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE OF ROOM TEMPERATURE TO 250*F. IN THE PRESENCE OF A PEROXIDE CATALYST, AND MAINTAINING A SUFFICIENT AMOUNT OF AN OXYGEN-CONTAINING GAS PRESENT DURING THE REACTION SO AS TO MAINTAIN THE REACTION TEMPERATURE NEAR THE EQUILIBRIUM TEMPERATURE FOR A PERIOD OF TIME SUFFICIENT TO OBTAIN SAID COPOLYMER.

Claim 4

A LUBRICATING OIL ADDITIVE MATERIAL HAVING THE DESIRABLE CHARACTERISTIC OF IMPROVING THE POUR POINT OF WAXY MINERAL LUBRICATING OIL INTO WHICH IT HAS BEEN INCORPORATED CONSISTING ESSENTIALLY OF A COPOLYMER OF FROM 75% TO 90% OF AN ALPHA-BETA UNSATURATED DICARBOXYLIC ACID ESTER OF A MIXTURE OF ALCOHOLS, SAID ALCOHOLS CONTAINING FROM 8 TO 18 CARBON ATOMS PER MOLECULE, SAID MIXTURE OF ALCOHOLS HAVING AN AVERAGE OF FROM 12 TO 14 CARBON ATOM, WITH FROM 10% TO 25% OF VINYL ACETABLE WHICH HAS BEEN PREPARED BY A PROCESS COMPRISING THE STEPS OF ADMIXING THE MONOMERS IN AN INERT SOLVENT, HEATING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE OF ROOM TEMPERATURE TO 250*F. IN THE PRESENCE OF A PEROXIDE CATALYST, AND MAINTAINING A SUFFICIENT AMOUNT OF AN OXYGEN-CONTAINING GAS PRESENT DURING THE REACTION SO AS TO MAINTAIN THE REACTION TEMPERATURE NEAR THE EQUILIBRIUM TEMPERATURE FOR A PERIOD OF TIME SUFFICIENT TO OBTAIN SAID COPOLYMER.