US4169187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder coating composition of a mixture of epoxy resins
Assignee: EIDP Inc
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Filing: 1978-03-28
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Granted: 1979-09-25
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Expires: 1998-03-28
Abstract
Abstract A powder coating composition of a mixture of epoxy resins is obtained by blending two types of epoxy resins with a curing agent. One resin is of the epichlorohydrin-bisphenol-A type. The other resin is an epichlorohydrin-bisphenol-A epoxy modified with an epoxy-novolac. Cure is obtained by using a dicyandiamide crosslinking agent. The composition is useful as a coating for the interior of food and beverage containers. The composition is also useful as a lining in hot-water services when finely divided polyvinylidine fluoride powder is added for hydrophobicity.
Inventors
- 👤 Barbara L. Glazar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:30
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/38; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021; C08G59/68; C09; C09D; C09D163/00; Y; Y10; Y10S; Y10S524/00; Y10S524/904; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
201 words
A thermosetting powder coating composition comprising finely divided particles at least 90 percent by weight of which have a maximum dimension not exceeding 100 microns wherein the particles consist essentially of (A) 12.50-72.95% by weight of an epoxy resin of the formula ##STR5## where n is sufficiently large to provide a resin with a Gardner Holdt Viscosity of L-U and having an epoxide equivalent weight of 600-1000; (B) 20-50% by weight of a first epoxy/epoxy novolac resin which is a epoxy resin of the formula of (A) modified with an epoxy novolac resin of the formula ##STR6## where n of the epoxy resin and m of the epoxy novolac resin are sufficiently large to provide an epoxy/epoxy novolac resin having a Gardner Holdt Viscosity of L-U and an epoxide equivalent weight of 400-900; (C) 5-30% by weight of a second epoxy/epoxy novolac resin of the formula of (B) but having values for n and m sufficiently large to provide an epoxy/epoxy novolac resin with a Gardner Holdt Viscosity of V-Z 1 and having an epoxide equivalent weight of 600-1000; (D) 0.05%-0.5% by weight of a catalyst of tri(dimethyl aminomethyl) phenol or fatty-acid salts thereof; and (E) 2.0-7.0% by weight of dicyanadiamide.
Claim 2
Dependent Claim
201 words
A thermosetting powder coating composition comprising finely divided particles at least 90 percent by weight of which have a maximum dimension not exceeding 100 microns wherein the particles consist essentially of (A) 12.50-72.95% by weight of an epoxy resin of the formula ##STR5## where n is sufficiently large to provide a resin with a Gardner Holdt Viscosity of L-U and having an epoxide equivalent weight of 600-1000; (B) 20-50% by weight of a first epoxy/epoxy novolac resin which is a epoxy resin of the formula of (A) modified with an epoxy novolac resin of the formula ##STR6## where n of the epoxy resin and m of the epoxy novolac resin are sufficiently large to provide an epoxy/epoxy novolac resin having a Gardner Holdt Viscosity of L-U and an epoxide equivalent weight of 400-900; (C) 5-30% by weight of a second epoxy/epoxy novolac resin of the formula of (B) but having values for n and m sufficiently large to provide an epoxy/epoxy novolac resin with a Gardner Holdt Viscosity of V-Z 1 and having an epoxide equivalent weight of 600-1000; (D) 0.05%-0.5% by weight of a catalyst of tri(dimethyl aminomethyl) phenol or fatty-acid salts thereof; and (E) 2.0-7.0% by weight of dicyanadiamide.
Claim 3
Dependent Claim
20 words
The powder coating composition of claim 1 additionally containing pigment in a pigment to binder ratio of 2/100 to 80/100.
Claim 4
Dependent Claim
55 words
The powder coating composition of claim 1 wherein the particles consist essentially of (A) 33.6-55.9% by weight of said epoxy resin; (B) 35.0-45.0% by weight of said first epoxy/epoxy novolac resin; (C) 5.0-15.0% by weight of said second epoxy/epoxy novolac resin; (D) 0.1-0.4% by weight of said catalyst, and (E) 4.0-6.0% by weight of dicyandiamide.
Claim 5
Dependent Claim
55 words
The powder coating composition of claim 1 wherein the particles consist essentially of (A) 28.6-60.9% by weight of said epoxy resin, (B) 20.0-30.0% by weight of said first epoxy/epoxy novolac resin; (C) 15.0-35.0% by weight of said second epoxy/epoxy novolac resin. (D) 0.1-0.4% by weight of said catalyst; and (E) 4.0-6.0% by weight of dicyandiamide.
Claim 6
Dependent Claim
25 words
The coating composition of claim 1 wherein said epoxy resin has a Gardner Holdt Viscosity of N-R and has an epoxide equivalent weight of 700-800.
Claim 7
Dependent Claim
24 words
The powder coating composition of claim 5 additionally containing 0.1-1.0% by weight of a flow-control agent of ethyl cellulose, a polyacrylate, or a siloxane.
Claim 8
Dependent Claim
16 words
The powder coating composition of claim 6 in which the flow control agent is a polyacrylate.
Claim 9
Dependent Claim
16 words
The powder coating composition of claim 6 additionally containing 0.05-0.5% by weight of finely divided silica.
Claim 10
Dependent Claim
18 words
A metal substrate coated with a smooth, even, coalesced layer of the powder coating composition of claim 1.
Claim 11
Dependent Claim
13 words
The coated metal substrate of claim 9 in which the metal is steel.
Claim 12
Dependent Claim
209 words
A thermosetting powder coating composition comprising fine divided particles at least 90 percent by weight of which have a maximum dimension not exceeding 100 microns wherein the particles consist essentially of (A) 15.5-46.5% by weight of an epoxy resin of the formula ##STR7## where n is sufficiently large to provide a resin with a Gardner Holdt Viscosity of L-U and having an epoxide equivalent weight of 600-1000; (B) 14.0-34.5% by weight of a first epoxy/epoxy novolac resin which is an epoxy resin of the formula of (A) modified with an epoxy novolac resin of the formula ##STR8## where n of the epoxy resin and m of the epoxy novolac resin are sufficiently large to provide an epoxy/epoxy novolac resin having a Gardner Holdt Viscosity of L-U and an epoxide equivalent weight of 400-900; (C) 3.0-19.0% by weight of a second epoxy/epoxy novolac resin of the formula of (B) but having values for n and m sufficiently large to provide an epoxy/epoxy novolac resin having a Gardner Holdt Viscosity of V-Z 1 and having an epoxide equivalent weight of 600-1000; (D) 0.04-0.4% by weight of a catalyst of tri(dimethyl aminomethyl) phenol or a fatty-acid salt thereof; (E) 1.5-5.0% by weight of dicyandiamide; and (F) 29.0-45.0% by weight of polyvinylidine fluoride.
Claim 13
Dependent Claim
209 words
A thermosetting powder coating composition comprising fine divided particles at least 90 percent by weight of which have a maximum dimension not exceeding 100 microns wherein the particles consist essentially of (A) 15.5-46.5% by weight of an epoxy resin of the formula ##STR7## where n is sufficiently large to provide a resin with a Gardner Holdt Viscosity of L-U and having an epoxide equivalent weight of 600-1000; (B) 14.0-34.5% by weight of a first epoxy/epoxy novolac resin which is an epoxy resin of the formula of (A) modified with an epoxy novolac resin of the formula ##STR8## where n of the epoxy resin and m of the epoxy novolac resin are sufficiently large to provide an epoxy/epoxy novolac resin having a Gardner Holdt Viscosity of L-U and an epoxide equivalent weight of 400-900; (C) 3.0-19.0% by weight of a second epoxy/epoxy novolac resin of the formula of (B) but having values for n and m sufficiently large to provide an epoxy/epoxy novolac resin having a Gardner Holdt Viscosity of V-Z 1 and having an epoxide equivalent weight of 600-1000; (D) 0.04-0.4% by weight of a catalyst of tri(dimethyl aminomethyl) phenol or a fatty-acid salt thereof; (E) 1.5-5.0% by weight of dicyandiamide; and (F) 29.0-45.0% by weight of polyvinylidine fluoride.
Claim 14
Dependent Claim
18 words
The powder coating composition of claim 11 additionally containing pigment in a pigment to binder ratio of 2/100-80/100.
Claim 15
Dependent Claim
62 words
The powder coating composition of claim 11 wherein the particles consist essentially of (A) 25.0-35.0% by weight of said epoxy resin; (B) 20.0-30.0% by weight of said first epoxy/epoxy novolac resin; (C) 4.0-8.5% by weight of said second epoxy/epoxy novolac resin; (D) 0.06-0.12% by weight of said catalyst; (E) 1.5-3.5% by weight of dicyandiamide; and (F) 33.0-41.5% by weight of polyvinylidine fluoride.
Claim 16
Dependent Claim
26 words
The powder coating composition of claim 11 wherein said epoxy resin has a Gardner Holdt Viscosity of N-R and has an epoxide equivalent weight of 700-800.
Claim 17
Dependent Claim
25 words
The powder coating composition of claim 14 additionally containing 0.1-1.0% by weight of a flow control agent of ethyl cellulose, a polyacrylate, or a siloxane.
Claim 18
Dependent Claim
15 words
The powder coating composition of claim 15 wherein the flow control agent is a polyacrylate.
Claim 19
Dependent Claim
15 words
The powder coating composition of claim 15 containing 0.05-0.5% by weight of finely divided silica.
Claim 20
Dependent Claim
18 words
A metal substrate coated with a smooth, even, coalesced layer of the powder coating composition of claim 11.
Claim 21
Dependent Claim
13 words
The coated metal substrate of claim 18 in which the metal is steel.
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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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |