Abstract: A safe and effective solid radiographic contrast medium which comprises an iodine-substituted aromatic polymer with an iodine content of 1 to 75% by weight and which is free of side effects on the digestive system such as constipation as found in barium preparations and which has no risk of causing iodine shocks as found in aqueous iodine preparations containing meglumine sodium amidotrizoate.

Abstract: A syringe type column used for liquid chromatography, wherein a stationary phase (4) and a solvent for development (5) are placed in a cylindrical barrel (1), and an air vent (2a) extends through a plunger (2) which is inserted in the barrel. Development is effected, while the air vent (2a) is closed to prevent air leakage therethrough, by pushing down the plunger (2). When the plunger (2) is drawn out in order to supplement the solvent for development, air flows into the cylindrical barrel (1) through the air vent (2a) so that an inner space of the barrel (1 ) is not held under a negative pressure and the stationary phase (4) is not disturbed.

Abstract: A syringe type column used for liquid chromatography, wherein a stationary phase (4) and a solvent for development (5) are placed in a cylindrical barrel (1), and an air vent (2a) extends through a plunger (2) which is inserted in the barrel. Development is effected, while the air vent (2a) is closed to prevent air leakage therethrough, by pushing down the plunger (2). When the plunger (2) is drawn out in order to supplement the solvent for development, air flows into the cylindrical barrel (1) through the air vent (2a) so that an inner space of the barrel (1) is not held under a negative pressure and the stationary phase (4) is not disturbed.

Abstract: A method for rendering a flammable polymer material flame-resistant, which comprises incorporating to the flammable polymer material a powder of a cross-linked aromatic polymer brominated to contain from 30 to 70% by weight of bromine.

Abstract: A powdered copolymer of an ethylenically unsaturated compound having a terminal double bond such as diisobutylene, styrene, an acrylate or an methacrylate and maleic anhydride or an ester thereof can directly be obtained by a polymerization process which comprises polymerizing the monomer mixture in a kneader or a Banbury type mixer in the presence or absence of a poor solvent for the copolymer to be produced to form a highly viscous resin phase containing the copolymer produced and the starting monomers dissolving said copolymer, kneading the highly viscous resin phase, proceeding further the polymerization reaction while kneading and shearing the resin phase to produce solid aggregates, and powdering said aggregates to produce a powdered copolymer.

Abstract: An alkyd-type resin composition comprising a chelate compound represented by the formula ##EQU1## wherein M is a metal of the first transition metal group (except for nickel), lead, or zirconium; Ar.sub.1 and Ar.sub.2 are each an aromatic residue, a substituted aromatic residue, or a heterocyclic aromatic residue; R, R.sub.1 and R.sub.2 are each hydrogen, an alkyl residue, a cycloaliphatic alkyl residue, an aromatic residue, a substituted aromatic residue, or a jointed residue of these radicals, and the carbon chains of R, R.sub.1 and R.sub.2 may contain hetero atoms such as oxygen, nitrogen, or sulfur. The said resin composition is characterized by little change in properties with the lapse of time, accelerated curing, and improved drying characteristics without gel formation in the surface layer of the resin.