Patent US4540743A successfully refreshed from Google Patents.
US4540743A
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Acylation of polyvinyl alcohols, and photopolymerizable and/or photocrosslinkable mixtures containing products thus acylated
Assignee: BASF SE
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Filing: 1984-06-25
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Granted: 1985-09-10
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Expires: 2004-06-25
Abstract
Abstract The acylation of polyvinyl alcohols is carried out by a process in which these alcohols are esterified with an activated carboxylic acid derivative in the presence of, as the catalyst, an aminopyridine derivative of the general formula (I) ##STR1## where R 1 and R 2 are each alkyl, or R 1 and R 2 together form an alkylene radical. The acylation is particularly advantageously carried out in the heterogeneous phase. The acylated polyvinyl alcohols prepared in this manner are used in photopolymerizable and/or photocrosslinkable mixtures.
Inventors
- 👤 Guenther Schulz
- 👤 Guenther Wallbillich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:24
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14; C08F2810/00; C08F2810/20; C08F2810/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A process for the acylation of a polyvinyl alcohol comprising esterifying the polyvinyl alcohol with a carboxylic acid derivative suitable for acylation reactions, in the heterogeneous phase in an aprotic dispersant, in the presence of a pyridine derivative catalyst of the formula I ##STR4## where R 1 and R 2 are each alkyl, or R 1 and R 2 together form an alkylene radical.
Claim 2
Dependent Claim
64 words
A process for the acylation of a polyvinyl alcohol comprising esterifying the polyvinyl alcohol with a carboxylic acid derivative suitable for acylation reactions, in the heterogeneous phase in an aprotic dispersant, in the presence of a pyridine derivative catalyst of the formula I ##STR4## where R 1 and R 2 are each alkyl, or R 1 and R 2 together form an alkylene radical.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, wherein the activated carboxylic acid derivative is an anhydride of a monocarboxylic or dicarboxylic acid.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1, wherein the activated carboxylic acid derivative is an activated derivative of an olefinically unsaturated carboxylic acid of 3 to 10 carbon atoms.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 2 wherein the activated carboxylic acid derivative is an anhydride of an α,β-olefinically unsaturated carboxylic acid of 3 or 4 carbon atoms.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 1, wherein the polyvinyl alcohol is a hydrolyzed polyvinyl acetate in which more than 75 mole % of the acetate groups are hydrolyzed.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 1, wherein the polyvinyl alcohol also contains copolymerized ethylene oxide units.
Claim 8
Dependent Claim
12 words
A process as claimed in claim 1, wherein the catalyst is p-dimethylaminopyridine.
Claim 9
Dependent Claim
12 words
A process as claimed in claim 1, wherein the catalyst is p-pyrrolidinopyridine.
Claim 10
Dependent Claim
22 words
A process as claimed in claim 1, wherein the esterification is further conducted in contact with one or more additional tertiary amines.
Claim 11
Dependent Claim
18 words
A process as claimed in claim 1, wherein the esterification is conducted at from 10° to 100° C.
Claim 12
Dependent Claim
28 words
A photopolymerizable or photocrosslinkable mixture which contains an acylated polyvinyl alcohol prepared by the process of claim 3, a photopolymerizable ethylenically unsaturated monomer or oligomer and a photoinitiator.
Claim 13
Dependent Claim
26 words
The process of claim 1, wherein the amount of catalyst of the formula I is from 0.1 to 15% by weight based on the polyvinyl alcohol.
Claim 14
Dependent Claim
31 words
The process of claim 12, wherein the alkyl is of 1 to 4 carbon atoms or R 1 and R 2 form an alkylene radical of 4 to 5 carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |