Patent ID: 7771125

Claim:
A rolling bearing retainer comprising a molding, of a synthetic resin composition, which holds a rolling element of a rolling bearing, wherein said molding comprises a resinous porous article having an interconnected hole porosity not less than 30% and a lubricating oil which impregnates said resinous porous article, wherein said resinous porous article is formed by molding a resin containing a pore-forming substance incorporated therein wherein said pore forming substance is a rust preventative agent, and by extracting a portion of said pore-forming substance from said molding with a solvent which dissolves said pore-forming substance and does not dissolve said resin, wherein said pore-forming substance is a weak alkali substance, wherein an unextracted portion of said pore-forming substance is capable of functioning as a rust preventative agent is retained in said porous article.