Patent ID: 6066278
Filing Date: 2000-05-23
Classification: B29B,B29C,B29K

Abstract:
A method for producing a composite material product, which has a high rigidity and a high heat deformation temperature, mainly composing of a wood cellulose filler and olefin series plastic, said method comprising the steps of:adding calcium oxide with a mixture of a wood cellulose filler crushed into a predetermined size, a granular olefin series plastic material and a rigidity improving agent mainly consisting of polypropylene modified by maleic anhydride or its derivative, an amount of said calcium oxide to be added being calculated so that water of said wood cellulose filler becomes finally 2-5% (percent weight); andmolding a compound produced by adding said calcium oxide to said mixture, by use of a molding machine,wherein said polypropylene modified by maleic anhydride has a high degree of modification by maleic anhydride and a small molecular weight.