Graft copolymers based on polyolefin backbone and methacrylate side chains
AssigneesEvonik Oil Additives GmbH, Regents of the University of Minnesota
InventorsKlaus Schimossek, Katrin Schoeller, Mohammad T. Savoji, Marc A. Hillmyer, Timothy P. Lodge
Life of this patent
Estimating the term…
Abstract
A graft copolymer can include, in its backbone, at least one segment having repeating units obtainable by ring-opening metathesis polymerization (ROMP) of an optionally substituted cycloalkene, and at least one segment comprising repeating units obtainable by atom transfer radical polymerization (ATRP) of a (meth)acrylate. The corresponding graft copolymer is highly suitable for use as an oil additive in internal combustion engines, in particular, in combustion engines which are operated for longer periods of time at substantially constant operating temperatures.
Claims19
A graft copolymer comprising in the backbone at least one segment A and in the side chain at least one segment B, wherein
- the segment A comprises a repeating unit obtainable by ring-opening metathesis polymerization of at least one compound of Formula (I):
- wherein
- R1 is a hydrogen atom or an optionally substituted hydrocarbon group having 1 to 40 carbon atoms, and
- at least one atom transfer radical polymerization initiator comprising an optionally substituted cycloalkenyl substituent;
- and
- the segment B comprises repeating units obtainable by atom transfer radical polymerization of at least two compounds of Formula (II):
- wherein the at least two compounds of Formula (II) comprise:
- a first compound of Formula (II), wherein R2 is a methyl group and R3 is an alkyl group having 2 to 5 carbon atoms;
- a second compound represented by Formula (II), wherein R2 is a methyl group and R3 is an alkyl group having 6 to 15 carbon atoms;
- and
- optionally, a third compound represented by Formula (II), wherein R2 is a methyl group and R3 is an alkyl group having 16 to 20 carbon atoms.
Dependencies are inferred from the claim text.