Patent US3370116A successfully refreshed from Google Patents.
Patent US2883206A successfully refreshed from Google Patents.
Patent US2201123A successfully refreshed from Google Patents.
Patent US3872040A successfully refreshed from Google Patents.
US3872040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wax-containing powder coatings
Assignee: PPG Industries Inc
•
Filing: 1972-10-02
•
Granted: 1975-03-18
•
Expires: 1992-10-02
Abstract
Abstract Powder coating compositions formulated to contain a minor proportion of a natural or synthetic wax provide for films having smooth surfaces which are substantially free of voids or entrapped gas pockets which generally appear at or near the surface of said films when they are fused. These powders can be coated onto substrates by techniques well known in the art such as fluidized bed, electrostatic fluidized bed, electrostatic spray, or the like to provide useful decorative and protective films.
Inventors
- 👤 Kenneth L Mollohan
- 👤 Joseph M Makhlouf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:03
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/03; C09D5/033; C09D167/00; Y; Y10; Y10S; Y10S524/00; Y10S524/901; Y10S524/902; Y10S525/00; Y10S525/934; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
A METHOD OF PROVIDING A SUBSTANTIALLY VOID-FREE FILM SURFACE FROM A RESIN POWDER COATING COMPOSITION WHICH COMPRISES THE STEPS OF: A. INCORPORATING FROM ABOUT 2 PERCENT TO ABOUT 5 PERCENT BY WEIGHT OF RESIN SOLIDS OF A NATURAL OR SYNTHETIC WAX IN SAID RESIN POWDER COATING COMPOSITION, WHEREIN SAID RESIN POWDER COATING COMPOSITION COMPRISES A RESIN POWDER SELECTED FROM THE GROUP CONSISTING OF CROSSLINKING ACRYLIC COPOLYMERS, POLYESTERS, POLYEPOXIDES AND AMIDE-IMINE POLYMERS; B. APPLYING SAID WAX-CONTAINING RESIN POWDER COATING COMPOSITION TO A SUBSTRATE; AND C. FUSING SAID WAX-CONTAINING RESIN POWDER COMPOSITION THEREBY PRODUCING A SUBSTANTIALLY VOID-FREE FILM SURFACE.
Claim 2
Independent Claim
97 words
A METHOD OF PROVIDING A SUBSTANTIALLY VOID-FREE FILM SURFACE FROM A RESIN POWDER COATING COMPOSITION WHICH COMPRISES THE STEPS OF: A. INCORPORATING FROM ABOUT 2 PERCENT TO ABOUT 5 PERCENT BY WEIGHT OF RESIN SOLIDS OF A NATURAL OR SYNTHETIC WAX IN SAID RESIN POWDER COATING COMPOSITION, WHEREIN SAID RESIN POWDER COATING COMPOSITION COMPRISES A RESIN POWDER SELECTED FROM THE GROUP CONSISTING OF CROSSLINKING ACRYLIC COPOLYMERS, POLYESTERS, POLYEPOXIDES AND AMIDE-IMINE POLYMERS; B. APPLYING SAID WAX-CONTAINING RESIN POWDER COATING COMPOSITION TO A SUBSTRATE; AND C. FUSING SAID WAX-CONTAINING RESIN POWDER COMPOSITION THEREBY PRODUCING A SUBSTANTIALLY VOID-FREE FILM SURFACE.
Claim 3
Dependent Claim
26 words
A method as in claim 1 wherein the wax is selected from the group consisting of castor wax, methyl-12-hydroxy stearate and an oxidized homopolymer of polyethylene.
Claim 4
Dependent Claim
20 words
A method as in claim 1 wherein the wax-containing resin powder coating composition is electrostatically applied to a metal substrate.
Claim 5
Dependent Claim
23 words
A method as in claim 1 wherein the composition is a reaction product of: a. polyester resin; and b. an amine aldehyde resin.
Claim 6
Dependent Claim
12 words
A method as in claim 4 wherein said reaction product is pigmented.
Claim 7
Dependent Claim
25 words
A method as in claim 4, wherein said reaction product comprises from about 5 to about 20 percent by weight of a amine aldehyde resin.
Claim 8
Dependent Claim
25 words
A method as in claim 5 wherein said polyester resin is a member of the class consisting of polyesters, oil-modified polyesters, and imide modified polyesters.
Claim 9
Dependent Claim
20 words
A method as in claim 4 wherein said amine-aldehyde resin is an aldehyde condensation product of melamine, urea or benzoguanamine.
Claim 10
Dependent Claim
48 words
A coating composition comprising a resin powder which is a reaction product of: a. a polyester resin; and b. an amine-aldehyde resin; said resin powder having incorporated therein from about 2 percent to about 5 percent by weight, based on resin solids, of a natural or synthetic wax.
Claim 11
Dependent Claim
48 words
A coating composition comprising a resin powder which is a reaction product of: a. a polyester resin; and b. an amine-aldehyde resin; said resin powder having incorporated therein from about 2 percent to about 5 percent by weight, based on resin solids, of a natural or synthetic wax.
Claim 12
Dependent Claim
12 words
A coating as in claim 9 wherein said reaction product is pigmented.
Claim 13
Dependent Claim
25 words
A coating as in claim 9 wherein said reaction product comprises from about 5 to about 20 percent by weight of a amine aldehyde resin.
Claim 14
Dependent Claim
26 words
A coating as in claim 11 wherein said polyester resin is a member of the class consisting of polyesters, oil-modified polyesters, and imide modified oil-free polyesters.
Claim 15
Dependent Claim
20 words
A coating as in claim 9 wherein said amine-aldehyde resin is an aldehyde condensation product of melamine, urea or benzoguanamine.
Claim 16
Dependent Claim
26 words
A coating as in claim 9 wherein the wax is selected from the group consisting of castor wax, methyl-12-hydroxy stearate and an oxidized homopolymer of polyethylene.
Claim 17
Dependent Claim
19 words
An article of mAnufacture having a fused film thereon, said film formed by fusing the composition of claim 9.
References Cited (Backward Citations)
US3138483A
Cited
US3211695A
Cited
US3627568A
Cited
US3594450A
Cited
US3583935A
Cited
US3557691A
Cited
US3666519A
Cited
US3624232A
Cited
US3576775A
Cited
US3756981A
Cited
US3759854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |