EP0142384A2
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EP
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A method for the preparation of photoinitiators
Assignee: Sericol Ltd
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Filing: 1984-11-16
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Granted: —
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Expires: 2004-11-16
Abstract
Abstract Photoinitiators are produced by introducing a halogen into a mixture of a diarylsulphide and a Lewis acid catalyst (preferably ACl 3 ) and from 0.2 to 2 parts by weight of inert solvent (preferably dichloromethane) per part of diarylsulphide followed by an anion exchange reaction with HX, NaX or KX where X is BF 4 , PF 6 , SbF 5 OH, AsF 6 , or SbF 6 . The products have the formula III:- in which Ar 1 is a monovalent, and Ar 2 is a divalent, aromatic radical selected from phenyl, naphthyl, anthryl, thienyl, furanyl and pyrryl whch may be substituted by alkyl, substituted alkyl, alkoxy, cyano, acetamido or acyl groups or halogen atoms.
Inventors
- 👤 Michael Ellwood
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 06:29
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/029; C; C07; C07C; C07C381/00; C07C381/12; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/687
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A method for the preparation of a triarylsulphonium salt of the formula III:- wherein X may be BF 4 , PF 6 , AsF 6 , SbF 6 or SbF 5 OH; Ar l is a monovalent and Ar 2 a divalent aromatic radical each of which may be selected from phenyl, naphthyl, anthryl, thienyl, furanyl and pyrryl, these radicals optionally being substituted with one or more alkyl, substituted alkyl, alkoxy, cyano, nitro, acetamido or acyl groups or halgen atoms; which method is characterised in that it comprises forming a triarylsulphonium halide in an initialreaction between a diarylsulphide Ar l- S-Ar l , a Lewis acid catalyst and a halogenin the presence of from 0.2 to 2 parts by weight of an inert solvent per part of diarylsulphide and at a temperature between 0°C and 25 0 C followed by an aqueous phase anion exchange between the triarylsulphonium halide and a compound of the formula NaX,KX or HX, where X is as defined above,and then separation and purification of the resultant sulphonium salt.
Claim 2
Independent Claim
173 words
A method for the preparation of a triarylsulphonium salt of the formula III:- wherein X may be BF 4 , PF 6 , AsF 6 , SbF 6 or SbF 5 OH; Ar l is a monovalent and Ar 2 a divalent aromatic radical each of which may be selected from phenyl, naphthyl, anthryl, thienyl, furanyl and pyrryl, these radicals optionally being substituted with one or more alkyl, substituted alkyl, alkoxy, cyano, nitro, acetamido or acyl groups or halgen atoms; which method is characterised in that it comprises forming a triarylsulphonium halide in an initialreaction between a diarylsulphide Ar l- S-Ar l , a Lewis acid catalyst and a halogenin the presence of from 0.2 to 2 parts by weight of an inert solvent per part of diarylsulphide and at a temperature between 0°C and 25 0 C followed by an aqueous phase anion exchange between the triarylsulphonium halide and a compound of the formula NaX,KX or HX, where X is as defined above,and then separation and purification of the resultant sulphonium salt.
Claim 3
Dependent Claim
31 words
A method as claimed in claim 1 wherein the initial reaction mixture containing the triarylsulphonium halide is poured directly into substantially an equal weight of a mixture of ice and water.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1 wherein the initial reaction is carried out at a temperature between lO o C and 15°C.
Claim 5
Independent Claim
22 words
A method as claimed in any of claims 1 to 3 wherein the inert solvent is dichloromethane, carbon disulphide, nitrobenzene or nitromethane.
Claim 6
Independent Claim
27 words
A method as claimed in any of claims 1 to 4 wherein the amount of solvent is 0.25 to 1 parts by weight per part of diarylsulphide.
Claim 7
Independent Claim
17 words
A method as claimed in any of claims 1 to 5 wherein the inert solvent is dichloromethane.
Claim 8
Independent Claim
19 words
A method as claimed in any of claims 1 to 6 wherein the Lewis acid is anhydrous aluminium chloride.
Claim 9
Independent Claim
16 words
A method as claimed in any of claims 1 to 7 wherein the diarylsulphide is diphenylsulphide.
Claim 10
Independent Claim
19 words
A method as claimed in any of claims 1 to 8 wherein the halogen is chlorine, bromine or iodine.
Claim 11
Dependent Claim
25 words
A triarylsulphonium salt for incorporation in UV initiated cationically curable formulations when produced by a method as claimed in any of claims 1 to 9.
Claim 12
Dependent Claim
27 words
A triarylsulphonium salt photoinitiator for use in epoxy resin containing UV curable formulations when prepared by a method as claimed in any of Claims 1 to 9.
References Cited (Backward Citations)
No citation records indexed.
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