US4581395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous coating composition, and its production
Assignee: Nippon Paint Co Ltd
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Filing: 1984-07-12
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Granted: 1986-04-08
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Expires: 2004-07-12
Abstract
Abstract An aqueous coating composition which comprises a carboxy group-containing resin powder (I), a basic compound (II) and an aqueous resin (III), optionally with a reactive compound (IV) to at least one of the resin powder (I) and the aqueous resin (III), in an aqueous medium, the basic compound (II) being contained in an amount of 0.4 to 1.2 equivalents to the carboxy group in the resin powder (I) so as to disperse the resin powder (I) into the aqueous medium and the weight proportion of the resin powder (I) and the aqueous resin (III) being from 2:98 to 98:2. The coating composition thus obtained is excellent in storage stability and workability and can provide a coating film having good performances.
Inventors
- 👤 Toshiharu Nakaya
- 👤 Takanobu Ueda
- 👤 Hidefumi Okuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:24
CPC Classifications
C; C09; C09D; C09D201/00; C09D161/00; C09D161/20; C09D161/26; C09D161/28; C09D163/00; C09D5/00; C09D5/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
239 words
An aqueous coating composition which is a suspension which comprises in an aqueous medium: (I) a carboxy group-containing solid resin powder which is by itself hardly dispersible into the aqueous medium but becomes dispersible in the presence of a basic compound to give a particle size of 3 to 60 microns, (II) a basic compound, (III) an aqueous resin optionally containing a carboxy group which has an acid value of 20 to 200 and a number average molecular weight of 500 to 30,000 and (IV) an epoxy resin reactive with at least one of the resin powder (I) and the aqueous resin (III), solid particles of the resin powder (I) and the epoxy resin (IV) being dispersed in the composition and the aqueous resin (III) being dissolved or solubilized in the aqueous medium, the basic compound (II) being contained in an amount of 0.6 to 1.0 equivalent to the carboxy groups in the resin powder (I) or of 0.5 to 1.0 equivalent to the carboxy groups in the resin powder (I) and the aqueous resin (III) so as to disperse the resin powder (I) into the aqueous medium, the weight proportion of the resin powder (I) and the aqueous resin (III) being from 2:98 to 60:40, the weight proportion of the resin powder (I) and the epoxy resin (IV) being 10:1-20 and the molar proportion of the carboxy group and the epoxy group in the entire system being 100:10-150.
Claim 2
Dependent Claim
239 words
An aqueous coating composition which is a suspension which comprises in an aqueous medium: (I) a carboxy group-containing solid resin powder which is by itself hardly dispersible into the aqueous medium but becomes dispersible in the presence of a basic compound to give a particle size of 3 to 60 microns, (II) a basic compound, (III) an aqueous resin optionally containing a carboxy group which has an acid value of 20 to 200 and a number average molecular weight of 500 to 30,000 and (IV) an epoxy resin reactive with at least one of the resin powder (I) and the aqueous resin (III), solid particles of the resin powder (I) and the epoxy resin (IV) being dispersed in the composition and the aqueous resin (III) being dissolved or solubilized in the aqueous medium, the basic compound (II) being contained in an amount of 0.6 to 1.0 equivalent to the carboxy groups in the resin powder (I) or of 0.5 to 1.0 equivalent to the carboxy groups in the resin powder (I) and the aqueous resin (III) so as to disperse the resin powder (I) into the aqueous medium, the weight proportion of the resin powder (I) and the aqueous resin (III) being from 2:98 to 60:40, the weight proportion of the resin powder (I) and the epoxy resin (IV) being 10:1-20 and the molar proportion of the carboxy group and the epoxy group in the entire system being 100:10-150.
Claim 3
Dependent Claim
27 words
The coating composition according to claim 1, wherein the resin powder (I) and the epoxy resin (IV) are present in a melt mixture in a powdery form.
Claim 4
Dependent Claim
21 words
The coating composition according to claim 2 wherein the particle size of the melt mixture is from 0.5 to 100 microns.
Claim 5
Dependent Claim
13 words
The coating composition according to claim 1 which comprises additionally a melamine resin.
Claim 6
Dependent Claim
14 words
The coating composition according to claim 1 which further comprises a basic pigment (V).
Claim 7
Dependent Claim
27 words
The coating composition according to claim 5, wherein the resin powder (I) and the basic pigment (V) are present in a melt mixture in a powdery form.
Claim 8
Dependent Claim
31 words
The coating composition according to claim 5 wherein the resin powder (I), the epoxy resin (IV) and the basic pigment (V) are present in a melt mixture in a powdery form.
Claim 9
Dependent Claim
23 words
The coating composition according to claim 5 wherein the weight proportion of the resin powder (I) and the basic pigment (V) is 100:3-100.
Claim 10
Dependent Claim
19 words
The coating composition according to claim 1 which further comprises an antichipping pigment (VI) and an anticorrosive pigment (VII).
Claim 11
Dependent Claim
49 words
The coating composition according to claim 9 wherein the amounts of the antichipping pigment (VI) and of the anticorrosive pigment (VII) are respectively from 2 to 50 parts by weight to 100 parts by weight of the combined amount of the resin powder (I) and the aqueous resin (III).
Claim 12
Dependent Claim
64 words
A process for preparing the coating composition according to claim 1, which comprises admixing the resin powder (I) with the epoxy resin (IV) in a melt state, admixing the thus prepared melt mixture in a powder form with the basic compound (II) and the aqueous resin (III) in the aqueous medium and stirring the resultant mixture at a temperature of 35° to 95° C.
Claim 13
Dependent Claim
19 words
The process according to claim 11 wherein the neutralization rate of the resulting composition is from 30 to 120%.
Claim 14
Dependent Claim
62 words
The process according to claim 11 wherein the melt mixture of the resin powder (I) with the epoxy resin (IV) is first dispersed into the aqueous medium by the aid of at least a portion of the basic compound (II) and then the resultant dispersion is admixed with the aqueous resin (III) and optionally the remaining portion of the basic compound (II).
Claim 15
Dependent Claim
66 words
The process according to claim 11 wherein the aqueous resin (III) is first dissolved or dispersed in the aqueous medium in the presence of at least a portion of the basic compound (II) and then the resultant solution or dispersion is admixed with the melt mixture of the resin powder (I) with the epoxy resin (IV) and optionally the remaining portion of the basic compound (II).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |