| http://www.w3.org/ns/prov#value | - Nevertheless, a convenient method can be suitably utilized which comprises the steps of adding the above-mentioned unsaturated acid or its derivative and an organic peroxide such as di-t-butyl peroxide, dicumyl peroxide or benzoyl peroxide as a radical generator to a polyolefin powder, stirring and mixing them by means of a high-intensity mixer or the like, and then melting/kneading and extruding
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