EP0230208A2
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EP
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Processing holograms
Assignee: Ilford Imaging UK Ltd
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Filing: 1986-12-05
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Granted: —
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Expires: 2006-12-05
Abstract
Abstract Holograms which contain gelatin as the binder are prepared by holographically exposing the holographic material by use of coherent light, developing the holographic image by a chemical or physical process and before processing, simultaneously or subsequently, treating the material with a solution of an onium compound which comprises at least one alkyl group having from 10 to 18 carbon atoms or in which the total number of carbon atoms in the substituent group it as least 15 or a polymeric compound which comprises at least one onium group in the repeating unit.
Inventors
- 👤 David Walter Butcher
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 00:57
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/38; G03C5/39; G03C5/40; G03C5/44
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
98 words
A method of preparing a hologram which uses gelatin as the binder which method comprises holographically exposing the holographic material by use of coherent light, developing the holographic image by a chemical or a physical process and before processing, simultaneously or subsequently, treating the material with a solution of an onium compound which comprises at least one alkyl group having from 10 to 18 carbon atoms or in which the total number of carbon atoms in the substituent group is at least 15 or a polymeric compound which comprises at least one onium group in the repeating unit.
Claim 2
Independent Claim
98 words
A method of preparing a hologram which uses gelatin as the binder which method comprises holographically exposing the holographic material by use of coherent light, developing the holographic image by a chemical or a physical process and before processing, simultaneously or subsequently, treating the material with a solution of an onium compound which comprises at least one alkyl group having from 10 to 18 carbon atoms or in which the total number of carbon atoms in the substituent group is at least 15 or a polymeric compound which comprises at least one onium group in the repeating unit.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the onium compound is a quaternary ammonium compound.
Claim 4
Dependent Claim
112 words
A method according to claim 2 wherein the quaternary ammonium compound has the formula I: wherein R is a straight chain alkyl group having 10 to 18 carbon atoms, R 1 and R 2 are each alkyl groups having 1 or 2 carbon atoms and R 3 is either an alkyl group having 1 to 2 carbon atoms, or an aralkyl group or a cycloalkyl group or a group of formula II: where R 4 and R 5 an each alkyl groups having 1 or 2 carbon atoms, or R 1 , R 2 and R 3 represent the atoms necessary to complete a heterocycLic aromatic ring and X is an anion.
Claim 5
Dependent Claim
22 words
A method according to claim 3 wherein in the compound of formula I R l and R 2 are each methyl groups.
Claim 6
Dependent Claim
27 words
A method according to claim 3 wherein the quaternary ammonium compound is cetyl pyridinium bromide, N-dodecylodimethylbenzyl ammonium chloride N-myristyltrimethyl ammonium chloride, N-dodecyldimethylcyclohexyl ammonium chloride or the compound:
Claim 7
Dependent Claim
72 words
A method according to claim 2 wherein the quaternary ammonium compound has the formula IV: where R 7 and R 8 are each alkyl groups having 1 or 2 carbon atoms, Rg is an optionally substituted alkyl group, (alkylene) is an alkylene radical which may be substituted or interrupted by heteroatoms, R 10 is a group which comprises an alkyl group having 10 to 18 carbon atoms and X is an anion.
Claim 8
Dependent Claim
17 words
A method according to claim 6 wherein the quaternary ammonium compound is a compound of the formula:
Claim 9
Dependent Claim
92 words
A method according to claim 2 wherein the quaternary ammonium compound is a compound of the general formula V: wherein R 17 and R 11 are each aliphatic hydrocarbon radicals containing 12 to 18 carbon atoms, R12 , R13 , R15 and R 16 are optionally substituted alkyl, cycloalkyl or aralkyl radicals, Z is an optionally substituted alkylene linking group which may comprise hetero atoms, Z 1 and Z 2 are alkylene radicals containing 2 or 3 carbon atoms, n is an integer of at most 2 and X is an anion.
Claim 10
Dependent Claim
78 words
A method according to claim 8 where in the formula V set forth therein: R 17 and R 11 are each straight chain alkyl radical having 12 to 18 carbon atoms, Z is a low molecular alkylene radical containing 2-4 carbon atoms optionally substituted by hydroxyl groups, R 12 , R 13 , R1 5 and R 16 are each alkyl groups comprising one or two carbon atoms and X is a halogen atom and n is 1.
Claim 11
Dependent Claim
14 words
A method according to claim 9 wherein the quaternary ammonium compound has the formula:
Claim 12
Dependent Claim
84 words
A method according to claim 2 wherein the quaternary ammonium compounds used are high molecular weight condensation products formed by reacting a compound of the general formula VII: where R 18 is an alkyl group having 10 to 18 carbon atoms and R 19 and R 20 are alkyl groups having 1 or 2 carbon atoms with epichlorhydrin in the presence of a catalyst to form a compound of the formula VIII: and heating this compound to form a high molecular weight condensation compound.
Claim 13
Dependent Claim
18 words
A method according to claim 9 wherein the compound of formula VIII set forth therein has the formula:
Claim 14
Dependent Claim
107 words
A method according to claim 2 wherein the polymeric compound comprising a quaternary ammonium group in the repeating unit is prepared by quaternising a diamine of the formula IX: where R 22 , R 23 , R 24 and R 25 are each alkyl groups having 1 or 2 carbon atoms and R 26 is an alkylene group which may be substituted or interrupted with hetero atoms with bischloromethyl diphenyl to yield a polymer having the repeating unit of formula X: wherein R 22 , R 23 , R 24 , R 25 and R 26 have the meanings just assigned to them and n is 10-15.
Claim 15
Dependent Claim
16 words
A method according to claim 13 wherein the repeating unit of formula X has the formula:
Claim 16
Dependent Claim
25 words
A method according to claim 2 wherein the polymeric compound comprising a quaternary ammonium groups in the repeating unit is polydimethyldiallyl ammonium chloride or bromide.
Claim 17
Dependent Claim
73 words
A method according to claim 1 wherein the onium comopund is a phosphonium comound having the general formula XII: where three of R 4 , R 5 , R 6 and R 7 are optionally substituted phenyl groups and the other of R 4 , R 5 , R 6 and R 7 is an alkyl group having 1 to 18 carbon atoms or an optionally substituted phenyl group and X-is an anion.
Claim 18
Dependent Claim
34 words
A method according to claim 1 wherein the onium compound is an arsonium compound of the general formula XIII: wherein R 4 - R 7 and X - are as defined in claim 16.
Claim 19
Dependent Claim
40 words
A method according to claim 1 wherein the onium compound is a sulphonium compound of the general formula XIV: wherein each of R 8 , Rg and R 10 are optionally substituted phenyl groups and X - is an anion.
Claim 20
Dependent Claim
27 words
A method according to cLaim 1 wherein the concentration of the solution of onium compounds used is from L to 20 g per 100 mL of water.
Claim 21
Dependent Claim
74 words
A method according to claim 1 wherein the hologram is silver halide sensitized wherein after the holographic exposure the holographic material is treated with an aqueous solution of the onium compound before development or the onium compound may be present in the silver halide developing solution or in a stop bath between silver halide development and bleaching or in the bleach bath or in a bath in which the material is treated after bleaching.
Claim 22
Dependent Claim
13 words
A hologram which has been prepared by the method according to claim 1.
References Cited (Backward Citations)
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