| abstract |
A method of modifying a polymer material whereby the polymer material is modified to give a highly durable surface without decreasing its strength. Namely, a polymer material is modified by the method comprising a combination of an impregnation step, an activation step, a step of grafting a monomer and a step of a treatment with a hydrophilic polymer. Thus, the hydrophilic nature, adhesiveness, etc. of polymer materials such as polyolefins can be improved without causing any decrease in the practical strength. The thus obtained polymer materials are usable in articles with a need for high water absorptivity and high adhesiveness, for example, water-absorbing materials and water-retaining materials for medical, sanitary, cosmetic and agricultural uses, for improving adhesiveness of synthetic papers, filters, fiber products for clothes and composite materials and the like. Among all, these materials are particularly usable in orthodontical instruments, writing implements and battery separators. |