Abstract:
A lubricating grease having a high dropping point, good stability against oxidation and long life contains a thickener comprising essentially the three components: lithium soap of C 12-24 hydroxy fatty acid; lithium phosphate salt produced from phosphoric or phosphorous acid ester and dilithium borate. The amounts of hydroxy fatty acid and phosphoric or phosphorous acid ester are 3-100 parts by weight and 0.05-15 parts by weight per part by weight of boric acid respectively.
Abstract:
Crystalline aluminates of the formula: I. (LiA x ) y ·2Al(OH) 3 ·nH 2 O II. Li(R) v r 2Al(OH) 3 ·nH 2 O, or III. M m (R) v r (D) w z 2Al(OH) 3 ·nH 2 O wherein A is one or more anions and/or negative-valence radicals or mixtures thereof; wherein, in formula I, x is a quantity of A ions or radicals sufficient to substantially satisfy the valence requirements of Li; wherein n is zero or the number of waters of hydration; wherein y is a numerical value at least sufficient to maintain the crystalline structure; wherein R is a monocarboxylic acid or dicarboxylic acid of C 6 -C 22 , including those which are OH - substituted; wherein r is greater than zero and represents the number of R ions in the molecule; wherein v is the valence of R, being monovalent or divalent; wherein M is divalent Zn or Ca cations; wherein D represents inorganic anions of valence 1-3, represented by w; wherein z is equal to or greater than zero and represents the number of D anions; wherein, in formula II, vr represents an amount of R anions to substantially satisfy the valence requirements of Li; wherein, in formula III, r>z and (vr + wz) represents an amount of combined anions, R and A, to substantially satisfy the valence requirements of M; with m representing the number of divalent M cations and having a numerical value in the range of 1 to 4. are found to improve the coefficient of friction and antiwear properties of lubrication fluids subjected to shearing, rubbing, or grinding forces at elevated pressure. Also, useful compositions are prepared by incorporating into organic materials, crystalline lithium aluminates of formula 1.
Abstract:
Disclosed is an effective thermal grease comprising a hyperbranched olefinic fluid and a thermally conductive filler. Property-modifying additives and fillers may also be included. The hyperbranched olefinic fluid is selected to have an average of at least 1.5 methine carbons per oligomer molecule and at least 40 methine carbons per one thousand total carbons. The thermal grease exhibits a flash point of 180° C. or higher, a pour point of 0° C. or lower, and a kinematic viscosity at 40° C. of no more than 200 cSt (0.0002 m 2/s). The composition may offer improved thermal conductivity, reduced tendency to migrate, and lower cost when compared with many other thermal greases, including silicone-based thermal greases.
Abstract:
A grease composition comprising a grease containing, in a base oil thereof, from 2 to 40% by weight, based on the total composition, of tricalcium phosphate [Ca3(PO4)2], the grease further containing (A) from 0.5 to 10% by weight, based on the total composition, of a molybdenum dialkyldithiocarbamate sulfide and (B) from 0.1 to 5% by weight, based on the total composition, of at least one of a zinc dialkyldithiophosphate and triphenyl phosphorothionate. The grease composition is excellent in mechanical stability, heat resistance, extreme pressure properties, and wear resistance.
Abstract:
The invention provides composites of organic polymeric compositions including a matrix of an organic polymer and a filler distributed throughout the matrix, the filler being present in the matrix substantially as separate particles, each about the fundamental particle size of the filler. The fillers are unique mixed metal hydroxide compositions that are obtainable in sub-micron size particles. These particles are layered and have a BET specific surface area in excess of about 100 m2/g. An anion of the particulates is selected to be compatible with the organic polymer thereby providing ease of dispersion of the filler particles throughout the polymer matrix.
Abstract:
A lubricant having good extreme pressure properties and wear resistance contains not less thatn 0.1% by weight of at least one metallic phosphorus chalcogenide or an intercalation compound thereof.