Patent ID: 8709586

Claim:
A molded article, comprising a surface-treated glass fiber that comprises a surface to which a sizing agent comprising a maleic acid-modified polypropylene-based resin and a silane coupling agent adhere, wherein the acid-modified polyolefin resin comprises (1) an amount of components extractable with boiling methyl ethyl ketone of 8 mass % or less; (2) a number average molecular weight (Mn), measured by gel permeation chromatography (GPC), of 6,000 to 48,000; and (3) an amount of an acid which has been added, measured by Fourier transform infrared spectroscopy, of 0.1 to 12 mass % the fiber diameter of the glass fiber being 3 to 30 μm, wherein the molded article has a fatigue strength under oscillation at 80 MPa and 10 Hz of at least 5000 times.