Abstract

Disclosed is a composition containing star-shaped binary ethylene-propylene copolymer for improving lubricating oil viscosity index and a preparation method thereof. The composition is mainly a solid of a star-shaped polymer prepared by melt polymerization of a binary copolymer (I), a catalyst (II), a modified monomer (III), and an auxiliary monomer (IV), or a liquid composition of the star-shaped polymer prepared by solution polymerization. The invention can improve the shear stability or low-temperature performance of OCP-type VII oil products without reducing detergency thereof.

IPC Classes  ?

• C08F 255/04 - Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group on to polymers of olefins having two or three carbon atoms on to ethene-propene copolymers
• C08F 222/14 - Esters having no free carboxylic acid groups
• C08F 222/20 - Esters containing oxygen in addition to the carboxy oxygen
• C08F 222/16 - Esters having free carboxylic acid groups
• C08F 222/22 - Esters containing nitrogen
• C08F 212/08 - Styrene
• C08F 220/56 - AcrylamideMethacrylamide
• C08F 279/02 - Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group on to polymers of conjugated dienes
• C08F 287/00 - Macromolecular compounds obtained by polymerising monomers on to block polymers
• C08F 2/06 - Organic solvent
• C10M 143/04 - Lubricating composition characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing propene
• C10N 30/02 - Pour-pointViscosity index
• C10N 30/08 - Resistance to extreme temperature
• C10N 30/10 - Inhibition of oxidation, e.g. anti-oxidants

Abstract

Disclosed are a lubricating oil viscosity index modifying agent containing a star-shaped SEP copolymer and a preparation method therefor. The modifying agent is a star-shaped solid prepared by subjecting a terpolymer (I), a catalyst (II), a modifying monomer (III) and an auxiliary monomer (IV) to a melt polymerization method, or a solution of a star-shaped polymer composition prepared via a solution polymerization method. On the premise of not decreasing the oil detergency of OCP-type VII, the viscosity index modifying agent can improve the shear stability or low-temperature performance.

IPC Classes  ?

• C10M 145/14 - AcrylateMethacrylate
• C08F 287/00 - Macromolecular compounds obtained by polymerising monomers on to block polymers
• C08F 212/08 - Styrene
• C10N 30/02 - Pour-pointViscosity index

Abstract

Disclosed are a lubricating oil viscosity index improver containing a star-shaped ethylene propylene diene monomer copolymer grafted with maleic anhydride and a preparation method therefor. The improver is a solid of a star-shaped polymer prepared by subjecting an ethylene propylene diene monomer rubber grafted with maleic anhydride, a catalyst (I), a modifying monomer (II) and an auxiliary monomer (III) to a specific melt polymerization method, or a liquid composition of a star-shaped polymer prepared via a solution polymerization method. On the premise of not decreasing the oil detergency of OCP-type VII, the present invention can improve the shear stability or low-temperature performance.

IPC Classes  ?

• C08F 285/00 - Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
• C08F 222/14 - Esters having no free carboxylic acid groups
• C08F 212/08 - Styrene
• C08F 8/50 - Partial depolymerisation
• C08F 255/06 - Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group on to polymers of olefins having two or three carbon atoms on to ethene-propene-diene terpolymers
• C10M 145/18 - Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• C10N 30/02 - Pour-pointViscosity index
• C10N 30/04 - Detergent or dispersant property
• C10N 30/08 - Resistance to extreme temperature
• C10N 30/10 - Inhibition of oxidation, e.g. anti-oxidants