US4446257A
Expired / Lapsed
US
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Aqueous coating powder suspensions and their preparation
Assignee: Shell USA Inc
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Filing: 1982-05-27
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Granted: 1984-05-01
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Expires: 2002-05-27
Abstract
Abstract Aqueous powder suspensions for thermoset coatings are prepared by intimately blending a mixture of (a) an epoxy resin/amine adduct having terminal amino groups, (b) a curing agent (phenolic resin, aminoplast resin, non-acidic polyester+transesterification catalyst), and, optionally, (c) a solid epoxy resin, said blend having a softening point of at least 70° C., and milling down in water to a particle size of less than 20 micrometers.
Inventors
- 👤 Petrus G. Kooijmans
- 👤 Wolfgang Kunze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:26
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/182; C08G59/184; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
An aqueous coating powder suspension containing no surfactant and no addition of acid wherein the powder particles comprise an intimate mixture of binder components comprising: (a) an epoxy resin/amine adduct which is essentially insoluble in water and having terminal amino groups and a plurality of alcoholic hydroxyl groups, (b) a cross-linking component, and, optionally, (c) a solid polyepoxide, said mixture having a softening point of at least 70° C. and a particle size in the suspension being essentially below 20 micrometers.
Claim 2
Dependent Claim
81 words
An aqueous coating powder suspension containing no surfactant and no addition of acid wherein the powder particles comprise an intimate mixture of binder components comprising: (a) an epoxy resin/amine adduct which is essentially insoluble in water and having terminal amino groups and a plurality of alcoholic hydroxyl groups, (b) a cross-linking component, and, optionally, (c) a solid polyepoxide, said mixture having a softening point of at least 70° C. and a particle size in the suspension being essentially below 20 micrometers.
Claim 3
Dependent Claim
38 words
The aqueous suspension of claim 1 wherein component (a) is an adduct of a polyglycidyl ether of a polyhydric phenol and one or more amines, each amine having at least one N--H function reactive with an epoxy group.
Claim 4
Dependent Claim
19 words
The aqueous suspension of claim 2 wherein component (a) is derived from a polyglycidyl ether of a dihydric phenol.
Claim 5
Dependent Claim
105 words
The aqueous suspension of claim 3 wherein component (a) is a compound having the average formula: A--B--C--B).sub.m A, wherein m is a number from 0 to 2, A is a group which is linked to B through a secondary or tertiary amino function and being derived from an amine having one secondary amino group, B is a group ##STR6## wherein n is a number from 0 to 4, R is the hydrocarbon radical of a dihydric phenol, and C is a group which is linked to B through two tertiary amino functions and being derived from an amine containing at least two secondary amino groups.
Claim 6
Dependent Claim
12 words
The aqueous suspension of claim 4 wherein A is a dialkanolamino group.
Claim 7
Dependent Claim
21 words
The aqueous suspension of claim 4 wherein component (a) is an adduct of a polyglycidyl ether of 2,2-bis(4-hydroxyphenyl)propane, monoethanolamine and diethanolamine.
Claim 8
Dependent Claim
56 words
The aqueous suspension of claim 1 wherein component (b) is selected from the group consisting of a melamine resin, a phenolic resin, and a transesterification system which is a combination of (1) a non-acidic polyester of a polycarboxylic acid the ester having more than one betahydroxyl ester group per molecule and (2) a transesterification-promoting metal compound.
Claim 9
Dependent Claim
26 words
The aqueous suspension of claim 1 wherein component (c) is a polyglycidyl ether of 2,2-bis(4-hydroxyphenyl)propane having a weight per epoxy of from about 700 to 1200.
Claim 10
Dependent Claim
47 words
A process for the preparation of an aqueous coating powder suspension as in claim 1 comprising the steps of (1) intimately blending the solid components and (2) milling the blend in at least 2/3 times its weight of water to a particle size below about 20 micrometers.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |