| 摘要 |
PURPOSE:To prevent the degradation by oxidation of thermoplastic resins before molding and improve the flowability during molding and the strengths of a resulting molding by selecting two thermoplastic resins of the same kind, one for the surface layer and the other for the inside layer, having wt. reduction start temps. satisfying a specific relation. CONSTITUTION:A fiber-reinforced thermoplastic resin sheet contg. about 40-wt.% glass fiber is obtd. by laminating the inside layer films 2a and 2b formed from a thermoplaptic resin (e.g. polypropylene) if necessary contg. an antioxidant, glass fiber mats 1, and the surface layer films 3 formed from the same kind of resin as the inside layer films and contg. an antioxidant, sandwiching the resulting laminate and a spacer between two stainless steel sheets, pressing the sandwich at 200 deg.C for about 5min with a press platen, and pressing it with a water-cooled press under 10kgf/cm<2> pressure for about 3-min. Resins for the surface and inside layers are selected so as to satisfy the relation: TS>=TC+5 (wherein TS is the wt. reduction start temp. ( deg.C) of the surface layer resin; and TC, the wt. reduction start temp. ( deg.C) of the inside layer resin). |
