Process of crosslinking PVP

Details Process of crosslinking PVP Process of crosslinking PVP

1992-09-16

1993-08-17

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

5253269, 526263, 526264, C08L 3900, C08F 2610

Patent

active

052369935

ABSTRACT:
A method of crosslinking polyvinylpyrrolidone (PVP) at a predetermined pH which comprises (a) providing a tertiary amino-functional PVP as a starting material, (b) condensing said starting material with a predetermined amount of epichlorohydrin to form an epichlorohydrin-functional PVP copolymer, and, if less than an equivalent of epichlorohydrin in use, unreacted starting material, (c) acidifying the resultant copolymer to form a solution of a storage stable glycidyl quat intermediate, and (d) increasing the pH of the solution to above 7 to convert the glycidyl quat into a glycidyl epoxide, and (e) crosslinking the glycidyl epoxide with free amine group on the copolymer or as added amine functional PVP copolymer to form a crosslinked PVP polymer.

REFERENCES:
patent: 4223009 (1980-08-01), Chakrabarti
patent: 4604217 (1986-08-01), Lukach et al.
patent: 4692328 (1987-09-01), Kitchell et al.
patent: 4772484 (1988-09-01), Kitchell et al.
patent: 4853437 (1989-08-01), Lukach et al.
patent: 5045617 (1991-09-01), Shih et al.
patent: 5191043 (1993-03-01), Shih

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