Described herein are associative polymers capable of controlling a physical and/or chemical property of non-polar compositions and related compositions, methods and systems. Associative polymers herein described have a non-polar backbone and functional groups presented at ends of the non-polar backbone, with a number of the functional groups presented at the ends of the non-polar backbone formed by associative functional groups capable of undergoing an associative interaction with another associative functional group with an association constant (k) such that the strength of each associative interaction is less than the strength of a covalent bond between atoms and in particular less than the strength of a covalent bond between backbone atoms.

An asphaltene dispersant composition is provided. The composition may contain an alkylphenol copolymer having the following repeating units (A) and (B):

##STR00001##

wherein, x is an integer from 1 to 200; y is an integer from 2 to 200; R.sub.1 is a straight or branched C.sub.1-C.sub.15 alkyl; and R.sub.2 is a straight or branched C.sub.2-C.sub.40 alkyl, wherein R.sub.2 is different than R.sub.1.

A paraffin inhibitor composition that exhibits stable properties at low temperature is provided. The composition may contain, for instance, an alkylphenol copolymer having the following repeating units (A) and (B):

##STR00001##

wherein, x is an integer from 1 to 200; y is an integer from 2 to 200; R.sub.1 is a straight or branched C.sub.1-C.sub.15 alkyl; and R.sub.2 is a straight or branched C.sub.16-C.sub.40 alkyl.

An alkylphenol copolymer, such as for use in a petroleum composition, is provided. The alkylphenol copolymer has the following repeating units (A) and (B):

##STR00001##

wherein, x is an integer from 1 to 200; y is an integer from 2 to 200; R.sub.1 is a straight or branched C.sub.1-C.sub.15 alkyl; and R.sub.2 is a straight or branched C.sub.2-C.sub.40 alkyl, wherein R.sub.2 is different than R.sub.1.

In one embodiment, an alkylphenol copolymer is disclosed wherein the copolymer comprises at least one alkylphenol monomer and the alkylphenol copolymer exhibits the following: an oscillation displacement of greater than 0 at a temperature of 5 C. in a first oscillation temperature sweep and an oscillation displacement in a second oscillation temperature sweep within 25% of the oscillation displacement in the first oscillation temperature sweep at a temperature of 5 C. In a further embodiment, a petroleum composition is disclosed wherein the composition comprises a petroleum source and a macromolecular compound wherein the macromolecular compound exhibits the following: an oscillation displacement of greater than 0 at a temperature of 10 C. in a first oscillation temperature sweep, and an oscillation displacement in a second oscillation temperature sweep within 25% of the oscillation displacement in the first oscillation temperature sweep at a temperature of 10 C.

In one embodiment, an alkylphenol copolymer is disclosed wherein the copolymer comprises at least one alkylphenol monomer and the alkylphenol copolymer exhibits the following: an oscillation displacement of greater than 0 at a temperature of 5 C. in a first oscillation temperature sweep and an oscillation displacement in a second oscillation temperature sweep within 25% of the oscillation displacement in the first oscillation temperature sweep at a temperature of 5 C. In a further embodiment, a petroleum composition is disclosed wherein the composition comprises a petroleum source and a macromolecular compound wherein the macromolecular compound exhibits the following: an oscillation displacement of greater than 0 at a temperature of 10 C. in a first oscillation temperature sweep, and an oscillation displacement in a second oscillation temperature sweep within 25% of the oscillation displacement in the first oscillation temperature sweep at a temperature of 10 C.

A fuel composition including a middle distillate fuel oil obtained from the distillation of a pyrolysis oil and, as an additive, one or more of: (a) an antioxidant; and (b) a stabilising additive selected from (x) alkoxylated amine compounds; (y) aldehyde-alkylphenol copolymers; (z) acylated nitrogen compounds; and mixtures thereof. Also disclosed are a method and use for improving the stability of a fuel composition comprising a middle distillate fuel oil obtained from the distillation of a pyrolysis oil, which involve adding to the composition one or more additives selected from (a) and (b).

A copolymer obtained by copolymerization of at least: an apolar monomer (m.sub.a) with the following formula (I), where u=0 or I, w=0 or I, E=-0- or NH(Z), or OCO, or NHCO or CONH, wherein Z is H or an alkyl group, and G is a group selected among an alkyl, an aromatic ring and an arylalkyl; and a polar monomer (m.sub.b) selected among those of the following formula (II), wherein t=0 or I, Q is selected among the oxygen atom and the NR group, wherein R is selected among a hydrogen atom and hydrocarbon chains, and R is a hydrocarbon chain substituted by at least one quaternary ammonium group and optionally one or more hydroxyl groups. The invention also relates to the use of such a copolymer as a detergent additive in a liquid fuel of an internal combustion engine.

Disclosed are pour point depressants used in compositions and methods for achieving the cold flow properties of synthetic feedstock derived from plastic.

Disclosed are pour point depressants used in compositions and methods for achieving the cold flow properties of synthetic feedstock derived from plastic.