Abstract: Additives for improving the low temperature flow properties of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and aldehyde, wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole % of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole % of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be sulfurized, or produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers.

Abstract: Additives for improving the low temperature flow properties of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and aldehyde, wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole % of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole % of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be sulfurized, or produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers.

Abstract: Additives for improving the low temperature flow properties and oxidative stability of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and sulfurizing agent, wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole percent of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole percent of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers.

Abstract: Copolymers of dialkyl fumarate and vinyl acetate having Specific Viscosities of at least 2.5 at 2% polymer concentration in xylene at 40.degree. C., and wherein at least 50 wt. % of said alkyl groups are C.sub.20 to C.sub.24, are useful as dewaxing aids, particularly in propane dewaxing.

Abstract: Solvent dewaxing of waxy hydrocarbon oils is improved by using a poly (n-C.sub.24) alkyl methacrylate polymer dewaxing aid in combination with lower melting point weight poly (C.sub.8 -C.sub.20) alkyl methacrylate polymer dewaxing aids. The solvent dewaxing processes improved using this combination dewaxing aid are the incremental and total predilution solvent type processes employing either surface chilled indirect heat exchanger means or direct chilling using cold solvent.The solvent dewaxing processes are those employing normally liquid dewaxing solvents, as exemplified by C.sub.3 -C.sub.6 ketones, such as methyl ethyl ketone, methyl isobutyl ketone and mixtures thereof, mixtures of ketones with aromatic such as MEK/toluene, halogenated C.sub.2 -C.sub.4 hydrocarbons such as tetrachloraethane, trichloro ethylene, etc.

Abstract: Copolymers of dialkyl fumarate and vinyl acetate having Specific Viscosities of at least 2.5 at 2% polymer concentration in xylene at 40.degree. C., and wherein at least 50 wt. % of said alkyl groups are C.sub.20 to C.sub.24, are useful as dewaxing aids, particularly in propane dewaxing.

Abstract: There is disclosed a diesel fuel containing a cetane number improving additive such as 5-propyl-1,2,3,4-tetraazacyclopenta-2,4-diene.