EP0104683A1
Expired / Lapsed
EP
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Process for coating an electrically conductive substrate and an aqueous composition containing a cationic binder
Assignee: Akzo NV
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Filing: 1983-08-30
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Granted: —
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Expires: 2003-08-30
Abstract
Abstract A process is provided for coating an electrically conductive substrate with an aqueous coating composition containing a cationic binder wherein the binder is obtained by polymerization of 100 parts by weight of a specified monomer mixture in the presence of a specified ethylenically unsaturated polyester resin, the degree of unsaturation being between 0,1 and 5,0 equivalents per 1000 molecular weight units and the maximum degree being dependent on the molecular weight and the weight proportion of the polyester. The invention also pertains to the aqueous coating composition as such.
Inventors
- 👤 Angelika Anita Zedler
- 👤 Jean Jacques Trescol
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 02:17
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/308; C; C08; C08F; C08F299/00; C08F299/02; C08F299/04; C08F299/0478; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/28; C08G18/40; C08G18/63; C08G18/631; C08G18/635; C08G18/638; C09; C09D; C09D151/00; C09D151/08; C09D5/00; C09D5/44; C09D5/4419; C09D5/4423
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
252 words
A process of coating an electrically conductive substrate with an aqueous coating composition containing a cationic binder, characterized in that the cationic binder is obtained by polymerization of 100 parts by weight of a monomer mixture consisting of 1-30% by weight of a hydroxyl (cyclo)alkyl (meth)acrylate of which the (cyclo)alkyl group has 2-8 carbon atoms, 4-45% by weight of an amino (meth)acrylate of the formula: wherein R 1 is an alkyl group having 1-12 carbon atoms or a cycloalkyl group having 5-8 carbon atoms, or groups R 1 together form an alkylene group having 4-7 carbon atoms which together with the nitrogen atom forms a heterocyclic ring system, and wherein one of the groups R 1 may be a hydrogen atom, R 2 is a hydrocarbon group having 2-12 carbon atoms and R 3 is a hydrogen atom or a methyl group, and 40-80% by weight of a monovinyl aromatic hydrocarbon having 8-14 carbon atoms and 0-35% by weight of a different monoethylenically unsaturated monomer having 2-20 carbon atoms, in the presence of A = 1-60 parts by weight of a polyester resin having a hydroxyl number in the range of 15 to 150, a calculated number average molecular weight Mn of 800-10 000 and U = 0,1-5,0 equivalents of ethylenically unsaturated double bonds per 1000 molecular weight units, provided that the maximum value U max of U equals the amino groups contained in the binder being at least partly neutralized with the aid of an acid before, during or after polymerization.
Claim 2
Dependent Claim
252 words
A process of coating an electrically conductive substrate with an aqueous coating composition containing a cationic binder, characterized in that the cationic binder is obtained by polymerization of 100 parts by weight of a monomer mixture consisting of 1-30% by weight of a hydroxyl (cyclo)alkyl (meth)acrylate of which the (cyclo)alkyl group has 2-8 carbon atoms, 4-45% by weight of an amino (meth)acrylate of the formula: wherein R 1 is an alkyl group having 1-12 carbon atoms or a cycloalkyl group having 5-8 carbon atoms, or groups R 1 together form an alkylene group having 4-7 carbon atoms which together with the nitrogen atom forms a heterocyclic ring system, and wherein one of the groups R 1 may be a hydrogen atom, R 2 is a hydrocarbon group having 2-12 carbon atoms and R 3 is a hydrogen atom or a methyl group, and 40-80% by weight of a monovinyl aromatic hydrocarbon having 8-14 carbon atoms and 0-35% by weight of a different monoethylenically unsaturated monomer having 2-20 carbon atoms, in the presence of A = 1-60 parts by weight of a polyester resin having a hydroxyl number in the range of 15 to 150, a calculated number average molecular weight Mn of 800-10 000 and U = 0,1-5,0 equivalents of ethylenically unsaturated double bonds per 1000 molecular weight units, provided that the maximum value U max of U equals the amino groups contained in the binder being at least partly neutralized with the aid of an acid before, during or after polymerization.
Claim 3
Dependent Claim
26 words
A process according to claim 1, characterized in that the hydroxy (cyclo)alkyl (meth)acrylate used in the monomer mixture is hydroxy ethyl acrylate and/or hydroxy propyl acrylate.
Claim 4
Dependent Claim
20 words
A process according to claim 1, characterized in that the monomer mixture contains 5-24% by weight of hydroxy (cyclo)alkyl (meth)-acrylate.
Claim 5
Dependent Claim
31 words
A process according to claim 1, characterized in that the amino (meth)acrylate used in the monomer mixture is a (di)alkylamino (meth)acrylate of which the alkyl group(s) has (have) 1-4 carbon atoms.
Claim 6
Dependent Claim
32 words
A process according to claim 1, characterized in that the amino (meth)acrylate used in the monomer mixture is a β-(di)alkylamino ethyl (meth)acrylate of which the alkyl group(s) has (have) 1-4 carbon atoms.
Claim 7
Dependent Claim
19 words
A process according to claim 1, characterized in that the monomer mixture contains 7-40% by weight of amino (meth)acrylate.
Claim 8
Dependent Claim
19 words
A process according to claim 1, characterized in that the monomer mixture contains 10-28% by weight of amino (meth)acrylate.
Claim 9
Dependent Claim
22 words
A process according to claim 1, characterized in that the monovinyl aromatic hydrocarbon used in the monomer mixture has 8-10 carbon atoms.
Claim 10
Dependent Claim
19 words
A process according to claim 8, characterized in that the monovinyl aromatic hydrocarbon used is styrene and/or vinyl toluene.
Claim 11
Dependent Claim
21 words
A process according to claim 1, characterized in that the monomer mixture contains 40-65% by weight of the monovinyl aromatic hydrocarbon.
Claim 12
Dependent Claim
22 words
A process according to claim 1, characterized in that the monomer mixture contains 0-15% by weight of a different monoethylenically unsaturated monomer.
Claim 13
Dependent Claim
69 words
A process according to claim 1, characterized in that the polyester resin is prepared by polycondensation of one or more aliphatic and/or cycloaliphatic mono-, di- and/or polyvalent alcohols having 2-24 carbon atoms and one or more aliphatic, cycloaliphatic and/or aromatic mono-, di- and/or polyvalent carboxylic acids having 2-36 carbon atoms and/or the anhydrides or acid halides thereof or the esters of such acids and alcohols having 1-6 carbon atoms.
Claim 14
Dependent Claim
15 words
A process according to claim 12, characterized in that the alcohol has 2-9 carbon atoms.
Claim 15
Dependent Claim
19 words
A process according to claim 13, characterized in that the alcohol used is neopentyl glycol, trimethylol propane and/or pentaerythritol.
Claim 16
Dependent Claim
16 words
A process according to claim 12, characterized in that the carboxylic acid has 2-12 carbon atoms.
Claim 17
Dependent Claim
25 words
A process according to claim 12, characterized in that a cycloaliphatic or aromatic dicarboxylic acid having 8-10 carbon atoms or a derivative thereof is used.
Claim 18
Dependent Claim
30 words
A process according to claim 16, characterized in that use is made of a tetrahydrobenzene dicarboxylic acid, a hexahydrobenzene dicarboxylic acid and/or a benzene dicarboxylic acid or an anhydride thereof.
Claim 19
Dependent Claim
19 words
'18. A process according to claim 12, characterized in that a fatty acid having 5-18 carbon atoms is used.
Claim 20
Dependent Claim
18 words
A process according to claim 12, characterized in that a fatty acid having 7-18 carbon atoms is used.
Claim 21
Dependent Claim
26 words
20 . A process according to claim 12, characterized in that the polyester is built up from 3-70% by weight of an ethylenically unsaturated fatty acid.
Claim 22
Dependent Claim
24 words
A process according to claim 20, characterized in that the polyester is built up from 5-55% by weight of an ethylenically unsaturated fatty acid.
Claim 23
Dependent Claim
31 words
A process according to claim 1, characterized in that 100 parts by weight of the monomer mixture are polymerized in the presence of 5-50 parts by weight of the polyester resin.
Claim 24
Dependent Claim
31 words
A process according to claim 1, characterized in that 100 parts by weight of the monomer mixture are polymerized in the presence of 5-40 parts by weight of the polyester resin.
Claim 25
Dependent Claim
45 words
A process according to claim 1, characterized in that the monomer mixture contains hydroxy cyclo(alkyl) (meth)acrylate, monovinyl aromatic hydrocarbon and the optionally present, other ethylenically unsaturated monomer [other than the amino (meth)acrylate] in amounts such that the binder contains more than 70% by weight thereof.
Claim 26
Dependent Claim
43 words
A process according to claim 1, characterized in that the polyester resin has a hydroxyl number of 30-70, a calculated number average molecular weight of 1500- 8000 and an unsaturation of 0,3-3,5 equivalents of ethylenically unsaturated double bonds per 1000 molecular weight units.
Claim 27
Dependent Claim
35 words
A process according to claim 1, characterized in that the coating composition is applied to the substrate by cataphoretic deposition at a voltage of 50-500 and an initial current density of 0,1-40 A/m 2 .
Claim 28
Dependent Claim
22 words
A process according to claim 1, characterized in that the coating applied to the substrate is baked at a temperature of 90°-250°C.
Claim 29
Dependent Claim
18 words
A process according to claim 1, characterized in that the coating is baked at a temperature of 110°-200°C.
Claim 30
Dependent Claim
243 words
An aqueous coating composition containing a cationic binder, characterized in that the cationic binder is obtained by polymerization of 100 parts by weight of a monomer mixture consisting of 1-30% by weight of a hydroxy (cyclo)alkyl (meth)acrylate of which the (cyclo)-alkyl group has 2-8 carbon atoms, 4-45% by weight of an amino (meth)acrylate of the formula: wherein R 1 is an alkyl group having 1-12 carbon atoms or a cycloalkyl group having 5-8 carbon atoms, or groups R 1 together form an alkylene group having 4-7 carbon atoms which together with the nitrogen atom forms a heterocyclic ring system, and wherein one of the groups R 1 may be a hydrogen atom, R 2 is a hydrocarbon group having 2-12 carbon atoms and R 3 is a hydrogen atom or a methyl group, and 40-80% by weight of a monovinyl aromatic hydrocarbon having 8-14 carbon atoms and 0-35% by weight of a different monoethylenically unsaturated monomer having 2-20 carbon atoms, in the presence of A = 1-60 parts by weight of a polyester resin having a hydroxyl number in the range of 15 to 150, a calculated number average molecular weight Mn of 800-10 000 and U - 0,1-5,0 equivalents of ethylenically unsaturated double bonds per 1000 molecular weight units, provided that the maximum value U max of U equals the amino groups contained in the binder being at least partly neutralized with the aid of an acid before, during or after polymerization.
Claim 31
Dependent Claim
243 words
An aqueous coating composition containing a cationic binder, characterized in that the cationic binder is obtained by polymerization of 100 parts by weight of a monomer mixture consisting of 1-30% by weight of a hydroxy (cyclo)alkyl (meth)acrylate of which the (cyclo)-alkyl group has 2-8 carbon atoms, 4-45% by weight of an amino (meth)acrylate of the formula: wherein R 1 is an alkyl group having 1-12 carbon atoms or a cycloalkyl group having 5-8 carbon atoms, or groups R 1 together form an alkylene group having 4-7 carbon atoms which together with the nitrogen atom forms a heterocyclic ring system, and wherein one of the groups R 1 may be a hydrogen atom, R 2 is a hydrocarbon group having 2-12 carbon atoms and R 3 is a hydrogen atom or a methyl group, and 40-80% by weight of a monovinyl aromatic hydrocarbon having 8-14 carbon atoms and 0-35% by weight of a different monoethylenically unsaturated monomer having 2-20 carbon atoms, in the presence of A = 1-60 parts by weight of a polyester resin having a hydroxyl number in the range of 15 to 150, a calculated number average molecular weight Mn of 800-10 000 and U - 0,1-5,0 equivalents of ethylenically unsaturated double bonds per 1000 molecular weight units, provided that the maximum value U max of U equals the amino groups contained in the binder being at least partly neutralized with the aid of an acid before, during or after polymerization.
Claim 32
Dependent Claim
21 words
A composition according to claim 29, characterized in that the monomer mixture contains 5-24% by weight of the hydroxy (cyclo)alkyl (meth)acrylate.
Claim 33
Dependent Claim
21 words
A composition according to claim 29, characterized in that the monomer mixture contains 7-40 % by weight of the amino (meth)acrylate.
Claim 34
Dependent Claim
21 words
A composition according to claim 29, characterized in that the monomer mixture contains 40-65% by weight of the monovinyl aromatic hydrocarbon.
Claim 35
Dependent Claim
68 words
A composition according to claim 29, characterized in that the.polyester resin is prepared by polycondensation of one or more aliphatic and/or cycloaliphatic mono-, di- and/or polyvalent alcohols having 2-24 carbon atoms and one or more aliphatic, cycloaliphatic and/or aromatic mono-, di- and/or polyvalent carboxylic acids having 2-36 carbon atoms and/or the anhydrides or acid halides thereof or the esters of such acids and alcohols having 1-6 carbon atoms.
Claim 36
Dependent Claim
15 words
A composition according to claim 33, characterized in that the alcohol has 2-9 carbon atoms.
Claim 37
Dependent Claim
25 words
A composition according to claim 33, characterized in that a cycloaliphatic or aromatic dicarboxylic acid having 8-10 carbon atoms or a derivative thereof is used.
Claim 38
Dependent Claim
18 words
A composition according to claim 33, characterized in that a fatty acid having 5-18 carbon atoms is used.
Claim 39
Dependent Claim
24 words
A composition according to claim 33, characterized in that the polyester is built up from 3-70% by weight of an ethylenically unsaturated fatty acid.
Claim 40
Dependent Claim
37 words
A composition according to claim 28, characterized in that the cationic binder is obtained by polymerization of 100 parts by weight of the monomer mixture in the presence of 5-40 parts by weight of the polyester resin.
References Cited (Backward Citations)
BE739506A
Cited
FR2073755A5
Cited
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