Method of crosslinking PVP

Details Method of crosslinking PVP Method of crosslinking PVP

1992-09-16

1993-06-15

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253282, 5253287, 5253288, 525355, 525385, 5263075, 526312, C08C 1932, C08C 1938, C08F 2608, C08F 2610

Patent

active

052199509

ABSTRACT:
The method of crosslinking polyvinylpyrrolidone (PVP) which comprises: copolymerizing vinyl pyrrolidone (VP) and an aminoalkene, a hydroxyalkene, or an aminoalkyl acrylamide or methacrylamide, to provide a crosslinkable, functional PVP copolymer as a starting material; then (a) condensing predetermined amounts of the starting material and a haloacetal under basic conditions to form a stable, crosslinkable PVP copolymer intermediate containing an acetal group as a functional appendant on the PVP polymer backbone; (b) acidifying the basic solution to hydrolyze the acetal group to an aldehyde group, and (c) crosslinking the aldehyde-functional PVP copolymer with the amine group of the amine-functional PVP copolymer, present on the polymer as free amine after step (a), or as added amine-functional copolymer to the reaction mixture, under basic conditions.

REFERENCES:
patent: 3178397 (1965-04-01), Olaj
patent: 3563968 (1971-02-01), Merijan
patent: 4086238 (1978-04-01), Krenzer
patent: 4605701 (1986-08-01), Harada
patent: 4692328 (1987-09-01), Kitchell
patent: 5073614 (1991-12-01), Shih

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