公开(公告)号：DE19681707T1

公开(公告)日：1999-01-28

申请号：DE19681707

申请日：1996-12-12

Applicant: ISP INVESTMENTS INC WILMINGTON

Inventor： ZHONG YUANZHEN ,  WOLF PHILIP F

IPC: C08F226/10 ,  C08F218/08 ,  C08F271/02

Abstract: Strongly swellable, moderately crosslinked poly(vinyl pyrrolidone/vinyl acetate) copolymer (XL-PVP/VA) in the form of fine, white powders characterized by (a) an aqueous gel volume of about 15 to 150 ml/g of polymer, (b) a Brookfield viscosity in 5% aqueous solution of at least about 10,000 cps, and (c) being prepared directly by precipitation polymerization of VP and VA monomers in the presence of a crosslinking agent in the amount of about 0.1 to about 2% by weight of VP and VA.