C11 to c13 copolymers of propene and n-butene

Claim 1

IN A PROCESS FOR PREPARING C11 TO C13 COPOLYMERS OF PROPENE AND N-BUTENE SUITABLE AS ALKYLATING REACTANTS FOR PRODUCING ALKYL AROMATIC SULFONATE DETERGENTS, THE IMPROVEMENT WHICH COMPRISES COPOLYMERIZING AN OLEFIN MIXTURE OF PROPENE AND BUTENES CONTAINING PRINCIPALLY PROPENE AND NORMAL BUTENE IN A PROPORTION OF 3 TO 10 MOLES OF PROPENE PER MOLE OF N-BUTENE AND LESS THAN 1/2 MOLE OF ISOBUTENE PER MOLE OF N-BUTENE IN THE PRESENCE OF A PHOSPHORIC ACID POLYMERIZATION CATALYST UNDER POLYMERIZATION CONDITIONS AT 350* F. TO 500* F., MAINTAINING A POLYMER CONVERSION YIELD OF SAID OLEFIN MIXTURE AT 85 TO 95 WEIGHT PER CENT AND PREVENTING RECYCLING OF C7 COPOLYMERS TO HOLD THE PROPORTION OF RESULTING C7 COPOLYMERS FORMED IN THE RESULTING REACTION MIXTURE PRODUCT WITHIN THE RANGE OF 10 TO 20 VOLUME PER CENT OF THE TOTAL POLYMER PRODUCT, AND SEPARATING FROM THE TOTAL POLYMER PRODUCT A C11 TO C12 COPOLYMER FRACTION BOILING IN THE RANGE OF 360* F. TO 425* F. FOR USE AS ALKYLATING REACTANTS.