Mixtures of (A) mixed esters of (a) C.sub.2-10 alkanepolyols, (b) certain dicarboxylic acids, and (c) C.sub.12-30 aliphatic hydrocarbon monocarboxylic acids, said esters having hydroxyl and acid numbers of 0 to 6 and having a molecular weight above 524, and (B) esters of C.sub.32-72 aliphatic monools with C.sub.18-72 aliphatic hydrocarbon monocarboxylic acids (the weight ratio of A to B being between 9:1 and 1:3) are useful as lubricants and detackifiers in thermoplastic molding compositions.

Stabilizers for chlorine-containing resins, derived from pentaerythritol and/or polypentaerythritols, which comprises at least one member selected from (1), a dehydration condensation product of pentaerythritol or polypentaerythritol, (2) a partial esterification product of pentaerythritol, polypentaerythritol or the dehydration condensation product with an aliphatic polybasic acid, (3) a partial esterification product of polypentaerythritol or the dehydration condensation product with an aromatic mono- or poly-basic acid, and (4) a partial esterification product of pentaerythritol, polypentaerythritol or the dehydration condensation product with an aliphatic or aromatic polybasic acid and a higher fatty acid. The stabilizers have the excellent effect of stabilizing chlorine-containing resins, and particularly the combination use with known organic zinc salt stabilizers brings excellent results.

An esterification product obtained by reacting ethylene oxide/propylene oxide block copolymer with a long-chain monocarboxylic acid, when employed as a supplemental rust inhibitor in lubricating oils for internal combustion engines, has been found to furnish excellent rust inhibition in the engines and to be compatible with other components in the lubricating oils. A lubricating oil composition containing such product may be used to inhibit rust formation in an internal combustion engine.

Lubricant compositions comprising (I), a viscosity improving agent, (II) a boron-containing dispersant, and (III) an ester of an aromatic carboxylic acid having six to ten carbon atoms in the aromatic nucleus and a total of 6 to 40 aliphatic and alicyclic carbon atoms as well as additive concentrates for making such lubricant compositions are disclosed. Preferably, (I) is a carboxy-containing interpolymer in which some carboxy radicals are esterified and the remaining carboxy radicals are neutralized with an amino compound and (II) is a borated, acylated polyamino compound, having an acyl group containing at least 50 carbon atoms. These lubricant compositions are useful as automatic transmission fluids and the like.

A thermal oxidatively stable synthetic fluid composition is disclosed. The composition is essentially comprised of an aromatic carboxylic acid ester of the general formula ##STR1## wherein Ar is an aromatic moiety, R is a neo hydrocarbyl group containing from about 5 to about 18 carbon atoms, with the proviso that R is not a cycloalkyl substituted neo hydrocarbyl group, R.sub.1 is a mono, di, tri or tetra functional hydrocarbyl group containing from 1 to about 18 carbon atoms, n is an integer from about 2 to about 4 and represents the total number of carboxylic acid ester groups on the aromatic moiety, a is an integer from about 1 to about 4, when a is 1 R.sub.1 is monovalent, when a is 2 R.sub.1 is divalent, when a is 3 R.sub.1 is trivalent and when a is 4 R.sub.1 is tetravalent, R.sub.2 is a hydrocarbyl group derived from a diol containing from about 2 to about 18 carbon atoms and x is an integer from 0 to about 4.