Abstract: An extreme pressure agent and a friction coefficient modifier which comprises a compound having, in a molecule, a group represented by general formula (I): ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 each represents hydrogen atom or methyl group, and at least one of R.sup.2 and R.sup.3 represents hydrogen atom; a fluid resistant to seizure under load and a wear resistant fluid which each comprises the above additive or the above modifier; and a flame resistant fluid which comprises a thermally polymerizable substance, preferably the above compound. The extreme pressure agent and the friction coefficient modifier have excellent properties and are advantageously used for lubricating oil, metal working oil, and hydraulic oil. The flame resistant fluid suppresses vaporization of flammable substances by thermal polymerization to prevent fire when the fluid is exposed to a high temperature and is advantageously used as lubricating oil, metal working oil, hydraulic oil, heat treatment oil, and grease.

Abstract: A method for the production of a sulfide group-containing thiol compound which comprises causing alkylene sulfide to react with a thiol compound in the presence of at least one basic catalyst selected from the group consisting of basic ion-exchange resins, quaternary ammonium compounds and alkyl pyridinium compounds, thereby inducing the ring-opening addition of the alkylene sulfide to the thiol compound. Further, a method for the production of a sulfide group-containing mercaptocarboxylic ester which comprises causing an alkylene sulfide to react with a mercaptocarboxylic ester.

Abstract: An object is to provide a method for the production of a sulfide group-containing thiol compound which comprises using a solvent capable of effecting the ring-opening addition reaction of an alkylene sulfide to a thiol compound without inducing the alkylene sulfide to polymerize. A method for the production of a sulfide group-containing thiol compound, which comprises effecting the ring-opening addition reaction of an alkylene sulfide represented by the general formula (1): ##STR1## (wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be identical or different, stand for a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, or an aromatic group of 6 to 15 carbon atoms) to a thiol compound in a solvent of an amide compound or urea substituent-containing compound.

Abstract: A process for producing a modified polyaminoamide with markedly increased reactivity as an epoxy resin curing agent is disclosed. The process comprises introducing amino groups and mercapto groups into a polyaminoamide by using an aziridine compound and a thiirane compound. The modified polyaminoamide is capable of curing an epoxy resin at a low temperature and at a high rate to provide a cured epoxy resin excellent in anticorrosion and chemical resistance.

Abstract: A process for improving the traction coefficient between at least two relatively rotatable elements having tractive surfaces in a torque transmitting relationship which comprises introducing between the tractive surfaces of the elements a traction drive fluid comprising, as the active component, a hydrocarbon compound having a bicylo octane skeleton.

Abstract: A traction drive fluid composition comprising a hydrocarbon having a bicyclo octane skeleton, such as a bicyclo(3,2,1) octane skeleton, a bicyclo(2,2,2)octane skeleton or a bicyclo(3,3,0)octane skeleton. The traction drive fluid has a low viscosity and has a high traction coefficient over a wide temperature range.

Abstract: A process for improving the coefficient of traction at high temperatures in a traction drive, and a tranction drive fluid for use therein. This traction drive fluid comprises the hydrogenated product of a dimer, a trimer or a tetramer of norbornanes and/or norbornenes, and exhibits excellent traction performance over a wide temperature range from low temperature to high temperature.

Abstract: The invention provides a novel compound 1,1-dicyclohexyl cycloalkane derivative represented by the general formula ##STR1## in which R.sup.1 and R.sup.2 are each a hydrogen atom or lower alkyl group, R.sup.3 to R.sup.6 are each a hydrogen atom, lower alkyl group or alkylene group forming a ring structure together with either one of the others and the carbon atom in the cycloalkane ring, and m and n are each zero or a positive integer not exceeding 6 with the proviso that m+n is 4-6, such as 1,1-dicyclohexyl cyclohexane. The compound has a relatively low viscosity and high traction coefficient even at elevated temperatures so that it is useful as a constituent of a traction-drive fluid usable in a compact and light-weight traction-drive apparatus. The compound can be synthesized by subjecting a corresponding 1,1-di(hydroxyphenyl) cycloalkane compound to a hydrogenation reaction and dehydration reaction in combination in the simultaneous presence of a hydrogenation catalyst and a dehydration catalyst.

Abstract: A process for improving the coefficient of traction between at least two relatively rotatable elements in a torque transmitting relationship, and traction drive fluid composition. This composition contains the hydrogenated product of a dimer, a trimer or a polymer having a degree of polymerization of more than 3 of a cyclic monoterpenoid monomer, and exhibits excellent traction performance over a wide temperature range from low temperature to high temperature.

Abstract: A stable fluid composition is provided by this invention which contains a cis-o-tercyclohexyl compound and a trans-o-tercyclohexyl compound at a weight ratio of 25:75-65:35. This composition is useful as a fluid for traction drive.

Abstract: This invention provides a novel perhydrofluorene derivative which is represented by the following general formula and which is useful as a fluid for traction drive and a process for production of the derivative. ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each represents a hydrogen atom or an alkyl group of 1-4 carbon atoms, X represents (CH.sub.2).sub.p or ##STR2## wherein R.sup.4 represents a hydrogen atom or an alkyl group of 1-4 carbon atoms, p represents a real number of 2-6, q represents a real number of 1-4 and s represents 1 or 0 and k, m and n each represents a real number of 1-4.