Solid phase modification of polyolefins and the preparation of composite materials

The solid phase modification of polyolefins with the low degree of cross linkage and decomposition and the high aghesive properties are described. The modification is achieved by the grafting of unsaturated carboxylic acids or their anhydrides to the extend of 1-5 % to polyethylene or polypropylene using organic peroxide initiators, dispersed together with the polyolefins in monomers. The strength-deformation properties of the modified polyolefins practically do not differ from the properties of initial polymers. The modification proceeds in solid phase (60-100°C) under shear stress.