Abstract: A perpendicular magnetic recording medium is formed of a soft magnetic layer, an anti-ferromagnetic layer, a magnetic recording layer, a protective layer, and a liquid lubricant layer deposited in that order on a non-magnetic substrate. The anti-ferromagnetic layer is a Mn alloy containing at least Co at 10 atomic % or greater and 50 atomic % or less or a Mn alloy containing at least Ir at 10 atomic % or greater and 30 atomic % or less. A radial magnetic field is applied during formation of the anti-ferromagnetic layer and the soft magnetic layer. Exchange coupling with the anti-ferromagnetic layer controls magnetic domain walls of the soft magnetic layer. The need for heat treatment after film formation is eliminated.

Abstract: Disclosed is Compound GEX1 of formula (I), having excellent antitumor activity: ##STR1## wherein R.sup.1 represents hydroxy or ##STR2## R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen or hydroxy; R.sup.5 represents hydroxyl or lower alkoxy; provided that when R.sup.1 is hydroxy and R.sup.5 is methoxy, then at least one of R.sup.2, R.sup.3 and R.sup.4 is the group except for hydrogen, and pharmaceutically acceptable salts thereof.

Abstract: A GE3 compound of the formula (I) having antibacterial and antitumor properties: ##STR1##

Abstract: A process for producing a light color high softening point hydrocarbon resin, which comprises polymerizing an oil fraction obtained by condensing a fractionated component withdrawn in a gas phase from a recovery section of a fractionating tower located below the feeding section and above the bottom of the tower during the fractional distillation in the tower of a feed oil fraction having a boiling point within a range of from 140.degree. to 280.degree. C. selected among cracked oil fractions obtained by thermal cracking of petroleum.

Abstract: A process for producing a high softening point hydrocarbon resin, which comprises polymerizing (a) an oil fraction having a boiling point within a range of from 140.degree. to 220.degree. C. selected among cracked oil fractions obtained by thermal cracking of petroleum and (b) a turpentine oil in the presence of a cationic polymerization catalyst, wherein the oil fraction (a) is adjusted to have a conjugated diolefin content of at most 1.5% by weight and a dicyclopentadiene (non-conjugated diolefin) content of from 7 to 17% by weight, the turpentine oil (b) is selected from the group consising of .alpha.-pinene, .beta.-pinene, dipentene and mixtures thereof and used in an amount of from 5 to 15% by weight, the cationic polymerization catalyst is at least one member selected from the group consisting of boron trifluoride, aluminum trichloride and complexes thereof, and the polymerization is conducted at a temperature of from 0.degree. to 70.degree. C.

Abstract: A process for producing a hydrocarbon resin which comprises polymerizing, by means of a Friedel-Crafts catalyst, a mixture of (1) a residual fraction obtained by polymerizing a fraction of a boiling point range of from 140.degree. to 280.degree. C. obtained from the decomposition of a petroleum and containing unsaturated hydrocarbons and removing the resulting polymer and (2) phenol and/or a phenol derivative.

Abstract: A method of preventing the scale from sticking wherein, upon the polymerization of vinyl type monomers in aqueous medium, reaction products of liquid polybutadiene with phenolic compounds or reaction products between thermoplastic resin gathered from the stumps of pine, phenolic compounds and, if desired, aldehyde compounds are coated beforehand onto the inside face of polymerization vessel, and a preventive agent of scale from sticking are disclosed.