Rubbery butadiene-styrene copolymenr compounded with an acid soluble hydrocarbon oil

Claim 1

AS A NEW COMPOSITION OF MATTER, A RUBBERY COPOLYMER OF 1,3-BUTADIENE AND STYRENE, COMPOUNDED WITH FROM 8 TO 40 WEIGHT PER CENT OF AN ACID-SOLUBLE OIL, SAID ACID-SOLUBLE OIL HAVING AN API GRAVITY AT 60*F. IN THE RANGE OF 10 TO 30, A VISCOSITY AT 100*F. IN THE RANGE OF 100 TO 1000 SUS, A FLASH POINT IN THE RANGE OF 190 TO 250*F., A FIRE POINT IN THE RANGE OF 220 TO 270*F., A POUR POINT AT A TEMPERATURE IN THE RANGE OF -30 TO 5, A TOTAL SOLIDS CONTENT IN THE RANGE OF 65 TO 0 PER CENT BY WEIGHT AN IODINE NUMBER WITHIN THE LIMITS OF 150 TO 300 AND AN ANILINE POINT WITHIN THE RANGE OF 30 TO 100, AND PRODUCED BY REACTING A HYDROCARBON STOCK IN THE PRESENCE OF A CATALYST COMPRISING HYDROFLUORIC ACID, SEPARATING FROM A RESULTING REACTION MIXTURE A HYDROCARBON PHASE CONTAINING A HYDROCARBON REACTION PRODUCT, AND A HYDROFLUORIC ACID PHASE CONTAINING OIL-SOLUBLE IMPURITIES, FLASH DISTILLING SAID HYDROFLUORIC ACID PHASE TO REMOVE HYDROFLUROIC ACID THEREFROM AS AN OVERHEAD FLASH DISTILLATION PRODUCT, RECOVERING A KETTLE PRODUCT FROM SAID FLASH DISTILLING FREE OF HYDROFLUORIC ACID, SAID KETTLE PRODUCT BEING SAID ACID SOLUBLE OIL.