RU2129577C1 RU98111146A RU98111146A RU2129577C1 RU 2129577 C1 RU2129577 C1 RU 2129577C1 RU 98111146 A RU98111146 A RU 98111146A RU 98111146 A RU98111146 A RU 98111146A RU 2129577 C1 RU2129577 C1 RU 2129577C1 Authority RU Russia Prior art keywords bentonite organophilic powdered method bentonite clay Prior art date 19980619 Appliion number…