EP0120671A2
Expired / Lapsed
EP
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Chlorination of hydroquinone
Assignee: EIDP Inc
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Filing: 1984-03-20
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Granted: —
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Expires: 2004-03-20
Abstract
Abstract Chlorination of hydroquinone by reacting sulfuryl chloride with a slurry or solution of hydroquinone in glacial acetic acid or an alkyl ester can yield a mixture containing a major proportion of monochlorohydroquinone.
Inventors
- 👤 Robert Samuel Irwin
- 👤 George C. Chiang Chih-Shu Chiang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 18:56
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/62
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A process for chlorinating hydroquinone to obtain a chlorinated mixture containing a major proportion of chlorohydroquinone comprising adding sulfuryl chloride to a slurry or solution of hydroquinone and glacial acetic acid or an alkyl ester having 2-8 carbon atoms, the mole ratio of sulfuryl chloride to hydroquinone being in the range of from about 0.8 to about 1.2 when the glacial acetic acid is employed and from about 0.55 to about 1.2 when alkyl ester is employed.
Claim 2
Dependent Claim
77 words
A process for chlorinating hydroquinone to obtain a chlorinated mixture containing a major proportion of chlorohydroquinone comprising adding sulfuryl chloride to a slurry or solution of hydroquinone and glacial acetic acid or an alkyl ester having 2-8 carbon atoms, the mole ratio of sulfuryl chloride to hydroquinone being in the range of from about 0.8 to about 1.2 when the glacial acetic acid is employed and from about 0.55 to about 1.2 when alkyl ester is employed.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein enough glacial acetic acid or alkyl ester is present to provide a solution of the hydroquinone and chlorinated reaction product.
Claim 4
Dependent Claim
24 words
3 . The process of claim 1 wherein 0.65-0.90 mole of sulfuryl chloride is present per mole of hydroquinone when alkyl ester is employed.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein the alkyl ester has 2-4 carbon atoms.
Claim 6
Dependent Claim
12 words
The process of claim 3 wherein the alkyl ester is ethyl acetate.
Claim 7
Dependent Claim
69 words
A process for preparing a melt-spinnable anisotropic-melt forming polyester by reacting chlorohydroquinone with other monomers comprising adding sulfuryl chloride to a slurry or solution of hydroquinone and glacial acetic acid, the mole ratio of sulfuryl chloride to hydroquinone being in the range of from about 0.8 to about 1.2 to obtain a chlorinated mixture, acetylating the mixture by heating with acetic anhydride, adding appropriate monomers and polymerizing the mixture.
Claim 8
Dependent Claim
69 words
A process for preparing a melt-spinnable anisotropic-melt forming polyester by reacting chlorohydroquinone with other monomers comprising adding sulfuryl chloride to a slurry or solution of hydroquinone and glacial acetic acid, the mole ratio of sulfuryl chloride to hydroquinone being in the range of from about 0.8 to about 1.2 to obtain a chlorinated mixture, acetylating the mixture by heating with acetic anhydride, adding appropriate monomers and polymerizing the mixture.
Claim 9
Dependent Claim
75 words
7 . A process for preparing a melt-spinnable anisotropic-melt forming polyester by reacting chlorohydroquinone with other monomers comprising adding sulfuryl chloride to a slurry or solution of hydroquinone and an alkyl ester having 2-8 carbon atoms, the mole ratio of sulfuryl chloride to hydroquinone being in the range of from about 0.55 to about 1.2 to obtain a chlorinated mixture, acetylating the mixture by heating with acetic anhydride, adding appropriate monomers and polymerizing the mixture.
Claim 10
Dependent Claim
75 words
7 . A process for preparing a melt-spinnable anisotropic-melt forming polyester by reacting chlorohydroquinone with other monomers comprising adding sulfuryl chloride to a slurry or solution of hydroquinone and an alkyl ester having 2-8 carbon atoms, the mole ratio of sulfuryl chloride to hydroquinone being in the range of from about 0.55 to about 1.2 to obtain a chlorinated mixture, acetylating the mixture by heating with acetic anhydride, adding appropriate monomers and polymerizing the mixture.
Claim 11
Dependent Claim
18 words
A fiber produced from the polymer resulting from a process as claimed in claim 6 or claim 7.
Claim 12
Dependent Claim
19 words
A melt-extruded bar when produced from the polymer resulting from a process claimed in claim 6 or claim 7.
Claim 13
Dependent Claim
20 words
A shaped article when produced from the polymer resulting from a process as claimed in claim 6 or claim 7.
References Cited (Backward Citations)
No citation records indexed.
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