| 摘要 |
PURPOSE:To obtain a molded product having airtightness and high strength with a simple composition, by impregnating a mat-shaped glass fiber with a resin based on a crystalline ethylene/propylene random copolymer. CONSTITUTION:A mat shaped glass fiber is prepared by accumulating strands each obtained by bundling glass fibers having a filament diameter of 3-30mum in an almost non-oriented state and forming the same into a mat shape by needle punching and a glass fiber mat obtained by parallelly arranging glass fiber rovings in order to provide directionality if necessary and arranging the same on the strands to perform needle punching may be also used. As a crystalline ethylene/proplylene random copolymer to be infiltrated in the glass fiber mat, one containing 2-6wt.% of ethylene is used and, when the content of ethylene is below 2wt.%, the airtightness of a molded product is not secured and, when exceeds 5wt.%, physical properties or thermal deformation temp. are lowered. The content of the mat-shaped glass fiber is pref. 35-60wt.% and, when said content is below 35wt.%, physical properties such as bending strength or the like become insufficient and, when 60% of more, glass fibers are exposed to the surface of the molded product or the airtightness of the molded product becomes inferior. |
