The present invention relates to compositions comprising at least one (per)fluoropolyether base oil and at least one polymer obtained by the copolymerization of (per)fluoropolyether (PFPE), tetrafluoroethylene (TFE) and at least one non-homopolymerizable olefin.

The invention is directed to a method for reducing low speed pre-ignition events in a spark-ignited direct injection internal combustion engine by supplying to the sump a lubricant composition which contains an oil of lubricating viscosity and an ashless dispersant. The ashless dispersant may be selected from succinimide compounds prepared from aliphatic or aromatic amines.

In some embodiments, ethylene-propylene branched copolymers are synthesized with pyridyldiamido catalysts and a chain transfer agent, and their performance as viscosity modifiers in oil are detailed. In some embodiments, the present disclosure provides for ethylene-propylene branched copolymers having a shear thinning onset of less than about 0.01 rad/s and an HTHS value of less than about 3.3. In some embodiments, the ethylene-propylene branched copolymer is used as a viscosity modifier in a lubricating composition and a fuel composition.

The present invention relates to a method of inhibiting corrosion experienced during use of a base oil or lubricant by the addition of a polyester corrosion inhibitor. More especially, the polyester corrosion inhibitor is the reaction product of an alk(en)yl substituted succinic anhydride wherein the average number of succinic groups per alk(en)yl group is less than 3.0, and at least one polyol. There is also provided a composition comprising such a polyester corrosion inhibitor and use of such a composition as a corrosion inhibitor, as well as a base oil or lubricant comprising such a polyester corrosion inhibitor.

The present invention relates to hydrogenated linear copolymers comprising butadiene and isoprene monomer units, as well as the process for preparing these copolymers. The invention further relates to a lubricating oil composition comprising one or more hydrogenated linear copolymers according to the invention, as well as to the use of the aforementioned copolymers as a lubricant additive or a synthetic base fluid for lubricant compositions, especially in gear oils, transmission oils, hydraulic oils, engine oils, grease, marine oils or industrial lubricating oils.

The invention discloses a photocured medical catheter hydrophilic lubricating coating and a preparation method thereof. The hydrophilic lubricating coating comprises a primer coating and a lubricating coating. The primer coating is attached to the surface of a device, and the lubricating coating is attached to the primer coating. The primer coating comprises 1-10 parts by weight of one or more polyester acrylates, 50-90 parts by weight of one or more solvents, 0.5-5 parts by weight of one or more photoinitiators, 0.5-2 parts by weight of one or more wetting agents and 0.5-5 parts by weight of one or more reactive (or active) diluents. The lubricating coating comprises 1-10 parts by weight of one or more water soluble macromolecules, 1-5 parts by weight of one or more crosslinking (or crosslinked) macromolecules, 0-1 part by weight of one or more photoinitiators, 0.1-1 part by weight of one or more surfactants and 50-98 parts by weight of one or more solvents. The preparation method of the hydrophilic lubricating coating is simple and easy in operation. Substance residues caused by complicated high-temperature chemical reactions are avoided. The cured coating forms a crosslinking (or crosslinked) structure, has good adhesion on the surface of a medical catheter and has excellent and lasting lubricity in an aqueous medium. The friction coefficient of the surface of the medical catheter is reduced. Harm to human tissues and adhesion of macromolecules in blood are decreased.

A multi-grade lubricating oil including a (meth)acrylate polymer with at least two distinct molecular weight arms and a blend of heavier and lighter base oils with increased amounts of the heavier base oil to achieve SAE grade performance. The compositions herein achieve SAE certifications as lower CCS viscosities at target kinematic viscosities for multi-grade oils.

A polymer composition, in which a differential distribution value in a differential molecular weight distribution curve of the polymer composition, as measured by gel permeation chromatography, satisfies Equation 1 and a maximum value of a normalized back-scattering intensity of a 35 wt % base oil solution of the polymer composition, where a size q of a scattering vector of small-angle X-ray scattering at 25° C. is in a range of 0.07 nm.sup.−1 or more and 2 nm.sup.−1 or less, is 40 cm.sup.−1 or more.

Disclosed are multifunctional compounds represented by structural formula (I):

##STR00001##

methods of producing compounds represented by structural formula (I) and their use in inhibiting corrosion in corrodible material.

A lubricating oil composition for agricultural machines, containing: at least one base oil selected from the group consisting of mineral oil-based base oils and synthetic oil-based base oils; and a polyalkyl methacrylate-based viscosity index improver having a weight average molecular weight of from 20,000 to 80,000, in which a kinematic viscosity at 100° C. is from 8.00 mm.sup.2/s to 10.00 mm.sup.2/s, a kinematic viscosity reduction rate at 100° C. in an ultrasonic shear stability test is 10.0% or less, and a Brookfield viscosity at −40° C. is 20,000 mPa.Math.s or less.