Nitrogen containing copolymers useful as additives for lowering the cloud point of hydrocarbon middle distillates and compositions containing them
AssigneesInstitut Francais du Petrole, Elf France
InventorsJacques Garapon, Bernard Sillion, Bernard Damin, Robert Leger
Life of this patent
Estimating the term…
Abstract
Copolymers with nitrogen groups are used as additives to lower the cloud point and improve the filterability limit temperature and the pour point of middle distillates such as gas oils. They are obtained by reacting a compound having a primary amine group with a copolymer comprising 15 to 40% of recurrent units form a linear .alpha.-olefin, 20 to 70% of recurrent units form and .alpha.,.beta.-unsaturated dicarboxylic compound and 15 to 45% of recurrent units form an alkyl ester of unsaturated monocarboxylic acid.
Claims27
A composition, useful as an additive for decreasing the cloud point of middle distillates, having a number-average molecular weight of 1,000-10,000, and being a copolymer consisting essentially of:
- 15-40% mole of recurrent units (A) from at least one unbranched .alpha.-olefin of at least 16 carbon atoms;
- 20-70% by mole of imidized recurrent units (B) from condensation, prior or subsequent to copolymerization, of at least one unsaturated .alpha.,.beta.-dicarboxylic compound, in the form of a diacid, a lower alkyl diester or an anhydride, with at least one compound having a single primary amine group, having the formula:
- ##STR5## wherein R is a monovalent saturated aliphatic radical having 1-30 carbon atoms, Z is 0, NH or NR', wherein R' is a monovalent saturated aliphatic radical having 1-30 carbon atoms;
- n is an integer from 2 to 4;
- m is zero or an integer from 1 to 4 when Z is NH, or an integer from 1 to 4 when Z is 0 or NR";
- and R" is a divalent saturated aliphatic radical having 1-18 carbon atoms;
- and
- 1- 40% by mole of recurrent units (C) from at least one alkyl ester of an unsaturated monocarboxylic acid.
A compound, useful as an additive for decreasing the cloud point of middle distillates, having a number-average molecular weight of 1,000-10,000 and being a copolymer consisting essentially of:
- 15-40% by mole of recurrent units (A) from at least one linear .alpha.-olefin of at least 16 carbon atoms;
- 20-70% by mole of imidized recurrent units (B) from condensation, prior or subsequent to copolymerization, of at least one maleic or alkylmaleic acid, a methyl, ethyl or propyl diester thereof or a maleic or alkylmaleic anhydride with at least one compound having a single primary amine group;
- and
- 15-40% by mole of recurrent units (C) from at least one alkyl ester of ann unsaturated monocarboxylic acid, wherein said alkyl ester of an unsaturated monocarboxylic acid providing the recurrent units (C) is at least one alkyl acrylate or methalcrylate having 4-30 carbon atoms in the alkyl group.
Dependencies are inferred from the claim text.