US4477642A — Selfcrosslinking heat-hardenable binder

Claim 1

Independent Claim 49 words

A selfcrosslinking heat-hardenable binder, in particular for electropaints, which is based on an organic synthetic resin which contains hydroxyl groups and esterified carboxyl groups and which is water-dilutable by partial or complete acid-neutralization of amino groups present in the resin, wherein the esterified carboxyl groups are carbalkoxymethyl ester groups.

Claim 2

Dependent Claim 49 words

A selfcrosslinking heat-hardenable binder, in particular for electropaints, which is based on an organic synthetic resin which contains hydroxyl groups and esterified carboxyl groups and which is water-dilutable by partial or complete acid-neutralization of amino groups present in the resin, wherein the esterified carboxyl groups are carbalkoxymethyl ester groups.

Claim 3

Dependent Claim 29 words

A binder as claimed in claim 1, wherein the synthetic resin contains 1 to 5 hydroxyl groups and 1 to 5 carbalkoxymethyl ester groups per 1,000 molecular weight units.

Claim 4

Dependent Claim 24 words

A binder as claimed in claim 2, wherein the equivalence ratio between the hydroxyl groups and the carbalkoxymethyl ester groups is 2:1 to 1:2.

Claim 5

Dependent Claim 92 words

A binder as claimed in claim 3, wherein the synthetic resin is an epoxy resin which has been prepared by reacting a polyglycidyl ester or ether with a compound which bears 2 groups which are reactive toward epoxide groups and at least one carbalkoxymethyl ester group to give an intermediate product having terminal epoxide groups and reacting these epoxide groups, by ring-opening, with a primary or secondary amine, a ketimine or aldimine which has a hydrogen atom at the nitrogen or with an amino alcohol which is blocked at the nitrogen atom.

Claim 6

Dependent Claim 87 words

A binder as claimed in claim 4, wherein the synthetic resin is a polyurethane resin which has been prepared by reacting a diisocyanate with a compound which bears groups which are reactive toward isocyanate groups and at least one carbalkoxymethyl ester group to give an intermediate product having terminal isocyanate groups and reacting these isocyanate groups with a primary or secondary amine, a ketimine or aldimine which has a hydrogen atom at the nitrogen atom or with an amino alcohol which is blocked at the nitrogen atom.

Claim 7

Dependent Claim 37 words

A process for preparing a binder, in particular for electropaints, which comprises reacting a polyglycidyl ester or ether with a compound which bears groups which are reactive toward epoxide groups and at least one carbalkoxymethyl ester group.

Claim 8

Dependent Claim 37 words

A process for preparing a binder, in particular for electropaints, which comprises reacting a polyglycidyl ester or ether with a compound which bears groups which are reactive toward epoxide groups and at least one carbalkoxymethyl ester group.

Claim 9

Dependent Claim 34 words

A process for preparing a binder, in particular for electropaints, which comprises reacting a diisocyanate with a compound which bears groups which are reactive toward isocyanate groups and at least one carbalkoxymethyl ester group.

Claim 10

Dependent Claim 34 words

A process for preparing a binder, in particular for electropaints, which comprises reacting a diisocyanate with a compound which bears groups which are reactive toward isocyanate groups and at least one carbalkoxymethyl ester group.

Claim 11

Dependent Claim 43 words

A process as claimed in claim 6, wherein the molar ratios of the starting materials used are chosen so as to produce a binder which has 1 to 5 hydroxyl groups and 1 to 5 carbalkoxymethyl ester groups per 1,000 molecular weight units.

Claim 12

Dependent Claim 44 words

A process as claimed in claim 8, wherein the molar ratios of the starting materials are chosen in such a way as to produce a binder which has an equivalence ratio between the hydroxyl groups and the carbalkoxymethyl ester groups of 2:1 to 1:2.

Claim 13

Dependent Claim 17 words

Use of a binder as claimed in claim 1, for preparing electrocoating baths for the electrocoating process.

Claim 14

Dependent Claim 90 words

A process for preparing coatings by dipping an electrically conductive substrate into an aqueous electrocoating bath which contains an at least partially acid-neutralized binder which contains hydroxyl groups, esterified carboxyl groups and amino and/or ammonium groups and is based on an organic synthetic resin, and connecting it therein as the cathode, depositing a film on the substrate by direct current, removing the substrate from the bath, and baking the film to harden it into a coating, wherein the esterified carboxyl groups of the organic synthetic resin are carbalkoxymethyl ester groups.

Claim 15

Dependent Claim 90 words

A process for preparing coatings by dipping an electrically conductive substrate into an aqueous electrocoating bath which contains an at least partially acid-neutralized binder which contains hydroxyl groups, esterified carboxyl groups and amino and/or ammonium groups and is based on an organic synthetic resin, and connecting it therein as the cathode, depositing a film on the substrate by direct current, removing the substrate from the bath, and baking the film to harden it into a coating, wherein the esterified carboxyl groups of the organic synthetic resin are carbalkoxymethyl ester groups.

Claim 16

Dependent Claim 34 words

A process as claimed in claim 11, wherein the binder used is a synthetic resin which contains 1 to 5 hydroxyl groups and 1 to 5 carbalkoxymethyl ester groups per 1,000 molecular weight units.

Claim 17

Dependent Claim 33 words

A process as claimed in claim 12, wherein the binder used is a synthetic resin which has an equivalence ratio between the hydroxyl groups and the carbalkoxymethyl ester groups of 2:1 to 1:2.

Claim 18

Dependent Claim 93 words

A process as claimed in claim 13, wherein the binder used is a synthetic resin which has been prepared by reacting a polyglycidyl ester or ether with a compound which bears 2 groups which are reactive toward epoxide groups and at least one carbalkoxymethyl ester group to give an intermediate product having terminal epoxide groups and reacting these epoxide groups, by ring-opening, with a primary or secondary amine, a ketimine or aldimine which has a hydrogen atom at the nitrogen atom or with an amino alcohol which is blocked at the nitrogen atom.

Claim 19

Dependent Claim 87 words

A process as claimed in claim 13, wherein the binder used is a synthetic resin which has been prepared by reacting a diisocyanate with a compound which bears groups which are reactive toward isocyanate groups and at least one carbalkoxymethyl ester group to give an intermediate product having terminal isocyanate groups and reacting these isocyanate groups with a primary or secondary amine, a ketimine or aldimine which has a hydrogen atom at the nitrogen atom or with an amino alcohol which is blocked at the nitrogen atom.

Claim 20

Dependent Claim 12 words

A coated substrate prepared by a process as claimed in claim 11.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-10-16	1988-04-16	1988-10-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-10-16	1992-04-16	1992-10-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-10-16	1996-04-16	1996-10-16	$7700.00	Window Closed / Lapsed

Selfcrosslinking heat-hardenable binder

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