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US 4,359,325 AGranted
Copolymers from acrylate dicarboxylic compounds and diisobutylene as oil additives
AssigneeInstitut Francais du Petrole
InventorsFrancois Dawans, Jean-Pierre Durand, Daniel Binet
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Abstract
Copolymers comprising acrylic ester units, dicarboxylic compounds units and diisobutylene units and whose average molecular weight by number is from 500 to 250,000 are useful for improving the cold-flow properties of lube oils and other hydrocarbon oils such as diesel oil, heavy fuel oil, residual fuel oil and crude petroleum.
Claims30
A copolymer consisting essentially of:
- (A) 10-94% by mole of acrylic ester units having the formula ##STR6## wherein R.sup.1 is H or CH.sub.3 ;
- and R.sup.2 is C.sub.1-30 alkyl;
- (B) 3-65% by mole of dicarboxylic units having the formula ##STR7## wherein R.sup.3 and R.sup.4 are each independently H or CH.sub.3 ;
- X and Y are each independently OR.sup.2, OR.sup.5 or NHR.sup.5 ;
- wherein R.sup.2 is C.sub.1-30 alkyl;
- and R.sup.5 is H or a monovalent organic radical;
- and
- (C) 3-40% by mole of diisobutylene units having the formula ##STR8## wherein the molar proportion of the units having the formula (B) is at least as high as the molar proportion of the units having the formula (C);
- and wherein said copolymer has a number average molecular weight of 500-250,000.
6 more elements
Dependencies are inferred from the claim text.