To improve the drying properties of the raw material for a rust preventive while maintaining strength of a conventional coating film and transparency thereof.
The raw material contains one or more kinds selected from natural resins such as rosin and a guaiac resin or the modified matter thereof. If required, the raw material is blended with; (1) 1 to 20 mass% of one or more kinds of wax components selected from petrolatum, the oxide thereof or the like; or with (2) 10 to 50 mass% of one or more kinds selected from synthetic resins such as a petroleum hydrocarbon resin and/or synthetic resins such as an alkyd resin; or with (3) 1 to 20 mass% of one or more kinds selected from petrolatum, the oxide thereof or the like, and 10 to 50 mass% of one or more kinds selected from synthetic resins such as a petroleum hydrocarbon resin and/or synthetic resins such as an alkyd resin. The raw material for the rust preventive for a steel tube thus obtained of 30 to 70 mass% is diluted with a petroleum solvent and/or an alcolic solvent or a mixed solvent thereof.
SATO KATSUJI
TANAKA KAZUO
MORI SHIZUO
PALACE CHEMICAL CO LTD