Described herein are associative polymers capable of controlling a physical and/or chemical property of non-polar compositions that can be used when the non-polar composition is in a flow, and related compositions, methods and systems. Associative polymers herein described have a non-polar backbone with a longest span having a molecular weight that remains substantially unchanged under the flow conditions 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.

A fuel composition comprising as an additive the reaction product of a polycarboxylic acid having no more than 5 carbon atoms per carboxylic acid group, or an anhydride thereof and an alcohol having at least 5 carbon atoms.

Disclosed are pour point depressants used in compositions and methods for achieving the cold flow properties of synthetic feedstock derived from plastic. A method of obtaining the synthetic feedstock is also disclosed, which includes heating plastic under substantially oxygen free conditions at a temperature of from about 400 C. to about 850 C. to produce a pyrolysis effluent, condensing the heated a pyrolysis effluent to obtain a synthetic feedstock, recovering the synthetic feedstock, and adding a pour point depressant to the synthetic feedstock to lower the pour point.

Disclosed are pour point depressants used in compositions and methods for achieving the cold flow properties of synthetic feedstock derived from plastic. A method of obtaining the synthetic feedstock is also disclosed, which includes heating plastic under substantially oxygen free conditions at a temperature of from about 400 C. to about 850 C. to produce a pyrolysis effluent, condensing the heated a pyrolysis effluent to obtain a synthetic feedstock, recovering the synthetic feedstock, and adding a pour point depressant to the synthetic feedstock to lower the pour point.

The present application describes a new process for the preparation of polyisobutene derivatives, such polyisobutene derivatives, and their use. The process irradiates a reaction mixture containing an oxygen-containing gas in contact with polyisobutene, a photosensitizer and an optional solvent, with monochromatic light emitted from an electroluminescent lighting device, at least 90% of power of said monochromatic light and at most 100% of said power being emitted in the range from 350 nm to 680 nm.

The present application describes a new process for the preparation of polyisobutene derivatives, such polyisobutene derivatives, and their use. The process irradiates a reaction mixture containing an oxygen-containing gas in contact with polyisobutene, a photosensitizer and an optional solvent, with monochromatic light emitted from an electroluminescent lighting device, at least 90% of power of said monochromatic light and at most 100% of said power being emitted in the range from 350 nm to 680 nm.