EP0259290A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
PVdF-based powder coatings
Assignee: TotalEnergies Onetech Belgium SA
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Filing: 1987-08-26
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Granted: —
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Expires: 2007-08-26
Abstract
Abstract A process for preparing pigmented PVdF-based powder coating products is disclosed, which comprises the steps of (i) mixing PVdF resin with a compatible thermoplastic resin, preferably PMMA, in a weight ratio of from 80:20 to 40:60, with pigments, and with a small amount of flow promoter, (ii) extruding and granulating, and (iii) cryogenically grinding the pellets and sieving the large particles. Also disclosed is a process for coating a substrate, comprising the steps of (a) applying said powder coating product on a substrate, and (b) subjecting to a heat treatment.
Inventors
- 👤 Willem Sietses
- 👤 Tjalling Meinoud Plantenga
- 👤 Jean-Paul Dekerk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 04:26
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/10; B05; B05D; B05D5/00; B05D5/08; B05D5/083; B29B9/00; B29B9/02; B29B9/06; C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/16; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/16; C09D133/00; C09D133/04; C09D133/06; C09D133/10; C09D133/12; B05D2401/00; B05D2401/30; B05D2401/32; B05D2506/00; B05D2506/10; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31511; Y10T428/3154
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
53 words
Process for preparing pigmented PVdF-based powder coating products, comprising the steps of : (i) mixing PVdF resin with one or more compatible thermoplastic resins and one or more pigments; (ii) extruding and granulating the resulting mixture; and (iii) cryogenically grinding the pellets, and sieving out particles which are larger than a predetermined size.
Claim 2
Dependent Claim
53 words
Process for preparing pigmented PVdF-based powder coating products, comprising the steps of : (i) mixing PVdF resin with one or more compatible thermoplastic resins and one or more pigments; (ii) extruding and granulating the resulting mixture; and (iii) cryogenically grinding the pellets, and sieving out particles which are larger than a predetermined size.
Claim 3
Dependent Claim
20 words
Process according to claim 1, wherein the PVdF resin has a molecular weight of from 10 000 to 70 000.
Claim 4
Dependent Claim
18 words
Process according to Claim 2, wherein the PVdF resin has a molecular weight of from 30,000 to 50,000.
Claim 5
Dependent Claim
24 words
Process according to anyone of Claims 1, 2 or 3, wherein the one or more compatible thermoplastic resins comprise a thermoplastic poly(methylmethacrylate) (PPMA) resin.
Claim 6
Dependent Claim
35 words
Process according to Claim 4, wherein the thermoplastic PMMA resin exhibits a viscosity of from 7 to 17 P in 40% solution in a 95:5 mixture by weight of toluene and ethylene glycol methyl ether.
Claim 7
Dependent Claim
21 words
Process according to any one of the preceeding Claims, wherein the weight ratio of PVdF/MMA is of from 80:20 to 40:60.
Claim 8
Dependent Claim
16 words
Process according to Claim 6, wherein the weight ratio of PVdF/PMMA is from 75:25 to 65:35.
Claim 9
Dependent Claim
40 words
Process according to any one of the preceeding Claims, wherein in the mixing step (i) the PVdF resin is also mixed with up to 3 wt % of a flow promoting agent based on the total weight of the mixture.
Claim 10
Dependent Claim
28 words
Process according to Claim 8, wherein the PVdF resin is mixed with 1 wt % of the flow promoting agent based on the total weight of the mixture.
Claim 11
Dependent Claim
58 words
Process according to any one of the preceeding Claims, wherein in the grinding step (iii) the pellets are cryogenically ground in a hammer mill wherein a rotating shaft carries hammers which break the pellets on fixed shapes in a casing of the hammer mill and hammer them through a sieving lining at the bottom of the hammer mill.
Claim 12
Dependent Claim
16 words
Process according to Claim 10, wherein the sieving lining has sieve openings of about 0.2 mm.
Claim 13
Dependent Claim
18 words
A pigmented PVdF-based powder coating product when obtained by the process of any one of the preceeding Claims.
Claim 14
Dependent Claim
48 words
Process for coating a substrate with a pigmented PVdF-based coating, comprising the steps of : (a) applying on the substrate a powder which has been prepared by the process according to any one of Claims 1 to 11; and (b) subjecting the applied powder to a heat treatment.
Claim 15
Dependent Claim
16 words
Process according to Claim 13, wherein the substrate has been previously covered with a primer coating.
Claim 16
Dependent Claim
24 words
Process according to either of Claims 13 or 14, wherein the heat treatment is carried out at a temperature of from 180 to 260°C.
References Cited (Backward Citations)
No citation records indexed.
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