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US 7,465,481 B2Granted
Exterior molding body comprising a long fiber reinforced thermoplastic resin
AssigneeMitsubishi Engineering-Plastics Corporation
InventorsHiroyuki Imaizumi, Motonori Ueda, Kouji Nishida, Kei Morimoto
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Abstract
The object the present invention is to provide an exterior molding body for automobile which is reinforced by a long fiber, is excellent in mechanical properties such as bending elastic modulus and bending strength, chemical resistance and heat resistance, is lightened, has high designability and is reduced in the anisotropy of linear expansion coefficient of molding body caused by the fiber orientation at filling thereof to a mold.
Claims15
An exterior injection molding body comprising a long fiber reinforced thermoplastic resin wherein:
- the content of the long fiber dispersed in the molding body is 30 to 90% by weight,
- the weight average fiber length of the long fiber is 1.5 to 10 mm,
- the maximum project area of said molding body is not less than 20000 mm2,
- the maximum linear expansion coefficient at a portion of said molding body having a wall thickness of not less than 2 mm is not more than 5×10−5K−1 and
- the ratio of maximum linear expansion coefficient/minimum linear expansion coefficient is not more than 1.8
- provided that when using a mold cavity having a shape with a portion of a resin flow path in which the reinforced thermoplastic flows having not more than 100 mm2 of cross sectional area is present in the mold cavity, the length of the resin flow path at said portion is not more than 150 mm.
3 more elements
Dependencies are inferred from the claim text.