Hydrocarbon fuels with carburetor detergent properties

Claim 1

Hydrocarbon fuel compositions exhibiting carburetor detergency properties comprising a major amount of a liquid hydrocarbon fuel and a minor effective amount of gasoline-soluble nitrogen-containing organic compound-grafted, hydrogenated conjugated diene/monovinylarene copolymer dissolved therein, said copolymer having a polymerized monovinylarene content of about 20 to 70 weight percent, with the proviso that when said copolymer contains a random block the block polymonovinylarene content is less than about 35 weight percent, a number average molecular weight suitable for gasoline solubility and in the range of about 1,000 to 10,000, the extent of hydrogenation of said copolymer such that about at least about 95 weight percent of olefinic double bonds having been saturated and less than about 5 weight percent of aromatic double bonds having been saturated, said copolymer characterized as having been prepared by the process which comprises reacting a metalated, conjugated diene hydrocarbon/monovinylarene hydrocarbon copolymer, optionally hydrogenated, with effective amounts of at least one nitrogen-containing organic compound represented by the general formulae X--Q--(NR 2 3 ) n or Y[Q--(NR 2 3 ) n ] m wherein each R 3 is the same or different alkyl, cycloalkyl, aryl, or combination radical, Q is a hydrocarbon radical having a valence of n+1 and is a saturated aliphatic, saturated cycloaliphatic, aromatic or combination radical, X is a functional group capable of reaction on a one-to-one basis with one equivalent of polymer metal, Y is or contains a functional group capable of reacting on a one-to-one basis with one equivalent of polymer metal, n is at least one, and m is 2 or 3, and wherein if said metalated copolymer has not previously been hydrogenated, subsequently hydrogenating said grafted copolymer.