Patent EP0176642A1 successfully refreshed from Google Patents.
EP0176642A1
Expired / Lapsed
EP
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Process for removal of low molecular weight fractions from vinyl pyridine polymers and copolymers
Assignee: Eastman Kodak Co
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Filing: 1984-09-27
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Granted: —
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Expires: 2004-09-27
Abstract
Abstract Disclosed is a process for separating high molecular weight polymers of alkenyl pyridine compounds having a pKa of about 2-10 from mixtures thereof with monomers and low molecular weight fractions comprising dispersing the mixture in a solution of an acid having a pKa of between about -10 and about 6 at a temperature of between about 50°C and about 70°C, to thereby dissolve the monomers and low molecular weight fractions while maintaining the high molecular weight polymers as a solid, and subsequently separating the solid high molecular weight polymer from the solution of monomers and low molecular weight fractions in aqueous acid.
Inventors
- 👤 John Richard Dombroski
- 👤 James Maynard Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:11
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
Process for separating high molecular weight polymers of alkenyl pyridine compounds having a pKa of about 2-10 and of the formula wherein R 1 is hydrogen or alkyl having 1-4 carbon atoms, and R 2 is hydrogen, alkyl having 1-4 carbon atoms. cycloalkyl having up to 8 carbon atoms, phenyl or alkyl substituted phenyl having up to 12 carbon atoms, or halogen, from mixtures thereof with monomers and low molecular weight fractions of said compounds characterized in that said mixture is dispersed in a solution of an acid having a pKa of between about-10 and about 6 at a concentration of between about 10% and about 50% solids and at a temperature of between about 50°C and about 70°C, to thereby dissolve said monomers and low molecular weight fractions while maintaining said high molecular weight polymers as a solid, and subsequently said solid high molecular weight polymer is separated from the solution of monomers and low molecular weight fractions in aqueous acid.
Claim 2
Dependent Claim
162 words
Process for separating high molecular weight polymers of alkenyl pyridine compounds having a pKa of about 2-10 and of the formula wherein R 1 is hydrogen or alkyl having 1-4 carbon atoms, and R 2 is hydrogen, alkyl having 1-4 carbon atoms. cycloalkyl having up to 8 carbon atoms, phenyl or alkyl substituted phenyl having up to 12 carbon atoms, or halogen, from mixtures thereof with monomers and low molecular weight fractions of said compounds characterized in that said mixture is dispersed in a solution of an acid having a pKa of between about-10 and about 6 at a concentration of between about 10% and about 50% solids and at a temperature of between about 50°C and about 70°C, to thereby dissolve said monomers and low molecular weight fractions while maintaining said high molecular weight polymers as a solid, and subsequently said solid high molecular weight polymer is separated from the solution of monomers and low molecular weight fractions in aqueous acid.
Claim 3
Dependent Claim
22 words
Process according to Claim 1 wherein said compounds are dispersed in said solution of an acid at a temperature of about 55-65°C.
Claim 4
Dependent Claim
16 words
Process according to Claim 1 wherein said acids have a pKa of about -3 and 5.
Claim 5
Dependent Claim
18 words
Process according to Claim 1 wherein said alkenyl pyridine compound is a polymer or copolymer of vinyl pyridine.
Claim 6
Dependent Claim
111 words
Process for separating high molecular weight polymers or copolymers of vinyl pyridine from mixtures thereof with monomers and low molecular weight fractions thereof characterized in that said mixture is dispersed in a solution of an acid having a pKa of between about -3 and about 5 at a concentration of between about 10% and about 50% solids and at a temperature of between about 55°C and about 65°C, to thereby dissolve said monomers and low molecular weight fractions while maintaining said high molecular weight polymers as a solid, and subsequently said solid high molecular weight polymer is separated from the solution of monomers and low molecular weight fractions in aqueous acid.
Claim 7
Dependent Claim
111 words
Process for separating high molecular weight polymers or copolymers of vinyl pyridine from mixtures thereof with monomers and low molecular weight fractions thereof characterized in that said mixture is dispersed in a solution of an acid having a pKa of between about -3 and about 5 at a concentration of between about 10% and about 50% solids and at a temperature of between about 55°C and about 65°C, to thereby dissolve said monomers and low molecular weight fractions while maintaining said high molecular weight polymers as a solid, and subsequently said solid high molecular weight polymer is separated from the solution of monomers and low molecular weight fractions in aqueous acid.
References Cited (Backward Citations)
EP0020279A1
Cited
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