FIELD: manufacture of composite materials, adhesive materials and facing materials. SUBSTANCE: process for preparing modified polyolefins by grafting unsaturated carboxylic acid or anhydride thereof on proliolefin in the presence of free radical initiator when mixture of reagents is extruded at 20-100 C at shear deformation form 50 to 1000% and at pressure form 0.3 to 5 MPa. EFFECT: more efficient preparation process. 3 cl, 5 tbl
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