Middle distillate pour depressant

Claim 2

A composition as defined by claim 2 wherein said halogenated polymer is comprised of 40-70 weight percent ethylene and 30-60 weight percent C3-C18 alpha-olefin.

Claim 3

A composition as defined by claim 3 wherein said alpha-olefin is propylene, said viscosity average molecular weight is about 85,000, said halogen is chlorine, the amount of said halogen is about 2.15 weight percent, and said polymer is prepared By copolymerizing ethylene and propylene in the presence of a catalyst mixture of ethyl aluminum sesquichloride and vanadium oxychloride.

Claim 4

A composition according to claim 2 wherein said halogenated polymer is comprised of 20-80 weight percent ethylene, 20-80 weight percent propylene and 0-15 weight percent of a third monomer selected from the group consisting of C4-C28 alpha-olefin, C4-C28 diolefin and mixtures thereof.

Claim 5

A composition as defined by claim 5 wherein said third monomer is a nonconjugated diolefin containing from about six to about 28 carbon atoms, the third monomer being present in an amount ranging from 0.5 to 10 percent by weight.

Claim 6

A composition as defined by claim 6 wherein said nonconjugated diolefin contains from about six to 12 carbon atoms.

Claim 7

A composition as defined by claim 7 wherein said third monomer is methylene norbornene, said halogen is bromine, the amount of said halogen is about 1.6 weight percent, and said polymer is prepared in the presence of a catalyst mixture of ethyl aluminum sesquichloride and vanadium oxychloride.

Claim 8

An oil concentrate comprising from about 10 to about 85 weight percent of a hydrocarbon solvent and from about 15 to about 90 weight percent of the oil-soluble halogenated polymer of claim 1.

Claim 9

An oil concentrate comprising from about 10 to about 85 weight percent of a hydrocarbon solvent and from about 15 to about 90 weight percent of the halogenated product of claim 5.

Claim 10

A petroleum distillate fuel composition having improved flow and pour characteristics, which comprises a major proportion of a petroleum distillate fuel having an atmospheric boiling range between about 250* F. and about 800* F., and from about 0.005 to about 2.5 weight percent of a halogenated, amorphous, random, oil-soluble, polymer comprised of 20-80 weight percent ethylene and 20-80 weight percent C3-C18 alpha-olefin, said polymer having a degree of crystallinity less than about 8 percent, having a viscosity average molecular weight in the range from about 50,000 to about 500,000 and halogenated to contain from about 0.25 to 20 percent by weight of halogen.

Claim 11

An oil concentrate comprising about 10 to 85 weight percent hydrocarbon and about 15 to 90 weight percent of the oil-soluble halogenated polymer of claim 11.