WO2004035637 PROCESS FOR MAKING CROSSLINKED POLYVINYLPYRROLIDONE

Publication Number WO/2004/035637

Publication Date 29.04.2004

International Application No. PCT/US2003/026274

International Filing Date 21.08.2003

Chapter 2 Demand Filed 15.03.2004

IPC

CPC

Applicants

ARCO CHEMICAL TECHNOLOGY, L.P. [US]/[US]

Inventors

STEINMETZ, Beth, M.
NANDI, Manish, K.

Agents

SCHUCHARDT, Jonathan, L.

Priority Data

10/272,729

17.10.2002

Publication Language English (en)

Filing Language English (EN)

Designated States

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Title

(EN) PROCESS FOR MAKING CROSSLINKED POLYVINYLPYRROLIDONE

(FR) PROCEDE DE PREPARATION DE POLYVINYLPYRROLIDONE RETICULE

Abstract

(EN) A process for making crosslinked polyvinylpyrrolidone (PVP-P) is disclosed. Crosslinker generation, followed by polymerization of NVP, gives a polymer containing up to 4 wt.% of residual NVP. An aqueous mixture of the polymer is then heated in the presence of a protic acid at pH < 4 to eliminate NVP. Finally, the PVP-P is neutralized with aqueous alkali metal hydroxide. The process generates a reduced volume of low-toxicity aqueous waste (< 20 L/kg PVP-P) and gives PVP-P that meets important product specifications.

(FR) L'invention concerne un procédé de préparation de polyvinylpyrrolidone (PVP-P) réticulé. La génération d'un agent de réticulation suivie d'une polymérisation de N-vinylpyrrolidone (NVP) permet d'obtenir un polymère contenant jusqu'à 4 % en poids de NVP résiduel. On chauffe ensuite un mélange aqueux de polymère en présence d'un acide protique à un pH < 4 afin d'éliminer NVP. Le PVP-P est enfin neutralisé à l'aide d'un hydroxyde métallique alcalin aqueux. Ledit procédé permet de produire un volume réduit de déchets aqueux à faible toxicité (< 20 L/kg PVP-P) et un PVP-P répondant à des spécifications de produits importantes.

C	CHEMISTRY; METALLURGY
08	ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F	MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
6	Post-polymerisation treatments

C	CHEMISTRY; METALLURGY
08	ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F	MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
8	Chemical modification by after-treatment
44	Preparation of metal salts or ammonium salts

C	CHEMISTRY; METALLURGY
08	ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F	MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
26	Homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
06	by a heterocyclic ring containing nitrogen
10	N-Vinyl-pyrrolidone

C	CHEMISTRY; METALLURGY
08	ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F	MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
6	Post-polymerisation treatments

C	CHEMISTRY; METALLURGY
08	ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F	MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
8	Chemical modification by after-treatment
44	Preparation of metal salts or ammonium salts

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1. WO2004035637 - PROCESS FOR MAKING CROSSLINKED POLYVINYLPYRROLIDONE