PURPOSE: To provide the non-black color powdery lubricant not using a black substance such as graphite and used for warm or hot plastic processing.
CONSTITUTION: The powdery lubricant comprises (a) the powder of one kind or more of compounds selected from lamellar silicate compounds each having an average particle diameter of 0.5-500μm and vegetable cellulose compounds and (b) one kind or more of substances selected from boron oxide, boric acid, alkali metal borates and oils each having a freezing point of 45°C or higher, the component (a) being impregnated with the component (b), and the method for producing the powdery lubricant. The lubricant exhibits an excellent lubricating property because of being good in its adhesiveness and in its lubricity- retaining property, and problems such as the carburization of the lubricant into processed products, the corrosion of devices, the pollution of working environments, etc., are much reduced in comparison with graphite lubricants.
IMAI YASUO