公开(公告)号：AU7927494A

公开(公告)日：1995-06-27

申请号：AU7927494

申请日：1994-09-29

Applicant: ISP INVESTMENTS INC

Inventor： ZHONG YUANZHEN ,  PARIKH HEMANT ,  SMITH TERRY E

IPC: C08F218/08 ,  C08F226/10 ,  C08F4/34

Abstract: A process for making homogeneous copolymers of vinylpyrrolidone (VP) and vinyl acetate (VA) which form clear aqueous solutions and have high cloud points. The process involves precharging VP and VA monomers in a predetermined ratio, and then feeding VP and VA at a predetermined rate, the ratio of the components in the initial charge and the feeding rates for the monomer being selected in accordance with the reactivity rates of the monomers towards copolymerization as opposed to homopolymerization.

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.

公开(公告)号：AU1290297A

公开(公告)日：1997-09-10

申请号：AU1290297

申请日：1996-12-12

Applicant: ISP INVESTMENTS INC

Inventor： ZHONG YUANZHEN ,  WOLF PHILIP F

IPC: C08F226/10 ,  C08F26/10

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.

公开(公告)号：AU5002300A

公开(公告)日：2001-01-30

申请号：AU5002300

申请日：2000-05-11

Applicant: ISP INVESTMENTS INC

Inventor： ZHONG YUANZHEN ,  JACHOWICZ JANUSZ ,  WOLF PHILIP F ,  MULLEN ROGER L MC JR

IPC: A61K8/02 ,  A61K8/04 ,  A61K8/81 ,  A61K31/79 ,  A61Q5/02 ,  A61Q5/06 ,  A61Q5/12 ,  C08F220/60 ,  C08F226/10 ,  A61K7/06 ,  A61K7/08

Abstract: A stable, aqueous cationic hydrogel of, by weight, 1-50% of a crosslinked cationic copolymer of 5-95% vinylpyrrolidone (VP) and 5-95% 3-dimethylaminopropyl(meth)acrylamide (DMAPMA) monomers, a crosslinking agent in an amount of 0.05-1% of said monomers, and water is described. The hydrogel has a pH of about 10 and a Brookfield viscosity of about 650 (Model DV-II+, RV spindle #3, speed 10 rpm); it can increase its viscosity by up to 40x at a pH of 3-9 and absorb up to 200x its weight of water. The hydrogel also can effectively condition hair even in the presence of an anionic surfactant.

公开(公告)号：EP0797618A4

公开(公告)日：1998-04-08

申请号：EP95940854

申请日：1995-11-29

Applicant: ISP INVESTMENTS INC

Inventor： ZHONG YUANZHEN ,  WOLF PHILIP F

IPC: C08F226/06 ,  C08K5/00 ,  C08K5/3412 ,  C08F26/08 ,  C08F26/10

CPC classification number: C08K5/0091 ,  C08F226/06

Abstract: This invention relates to a process for the production of substantially odorless, color stable N-vinyl heterocyclic copolymer which includes contacting alcohol solution of the copolymer, under reduced pressure, with water and a reducing agent selected from the group of a nitrogen containing borane complex, sulfurous acid and an alkali metal salt of sulfurous acid and recovering an aqueous, 10-80 wt.% solids solution of the copolymer having a substantially color free stability for a period of more than a year. The invention also relates to an N-vinyl heterocyclic copolymer in substantially pure deionized water or in aqueous alcoholic solution which exhibits significantly reduced color and odor and which is obtained by contacting an alcohol-copolymer mixture with water and a nitrogen containing, trivalent boron complex compound and stripping alcohol from the resulting mixture.