US3864149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating workpieces with thermoplastic synthetic resins
Assignee: GEA Group AG
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Filing: 1973-06-29
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Granted: 1975-02-04
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Expires: 1993-06-29
Abstract
Abstract A process for coating a workpiece with a synthetic resin comprising the steps of adhering particles of a thermally fusible synthetic resin to the workpiece to form a layer thereon and thereafter smoothing the layer and fusing the particles into a continuum by treating the workpiece with a high-molecular-weight sulfuric acid-treated and/or bleaching-earth-treated liquid hydrocarbon nonreactive with the synthetic resin and at a temperature above the melting point of the synthetic resin; the liquid hydrocarbon has a viscosity at 100*C greater than 10 cSt.
Inventors
- 👤 Werner Scheiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:53
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/02; B05D3/0254; B05D3/007; B05D1/00; B05D1/18; B05D1/22; B05D1/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A PROCESS FOR COATING A WORKPIECE WITH A THERMALLYFUSIBLE SYNTHETIC RESIN COMPRISING THE STEPS OF: A. HEATING A WORKPIECE TO AT LEAST THE SOFTENING TEMPERATURE OF SAID RESIN; B. ADHERING PARTICLES OF SAID SYNTHETIC RESIN TO THE WORKPIECE BY CONTACTING THE HEATED WORKPIECE WITH SAID PARTICLES TO FORM A ROUGH FRITTED LAYER OF SAID PARTICLES ON SAID WORKPIECE; C. THEREAFTER COALESCING AND SMOOTHING SAID LAYER AND FUSING SAID PARTICLES INTO A CONTINUUM BY TREATING THE WORKPIECE WITH SAID LAYER ADHERENT THERETO WITH A HIGH-MOLECULARWEIGHT LIQUID HYDROCARBON IN WHICH SAID SYNTHETIC RESIN IS INSOLUBLE AT A TEMPERATURE ABOVE THE SOFTENING POINT OF SAID SYNTHETIC RESIN, SAID LIQUID HYDROCARBON HAVING A VISCOSITY AT 100*C GREATER THAN 10 CST; AND D. THEREAFTER COOLING THE SYNTHETIC-RESIN LAYER BY TREATING IT WITH WATER FOLLOWING STEP (C).
Claim 2
Dependent Claim
131 words
A PROCESS FOR COATING A WORKPIECE WITH A THERMALLYFUSIBLE SYNTHETIC RESIN COMPRISING THE STEPS OF: A. HEATING A WORKPIECE TO AT LEAST THE SOFTENING TEMPERATURE OF SAID RESIN; B. ADHERING PARTICLES OF SAID SYNTHETIC RESIN TO THE WORKPIECE BY CONTACTING THE HEATED WORKPIECE WITH SAID PARTICLES TO FORM A ROUGH FRITTED LAYER OF SAID PARTICLES ON SAID WORKPIECE; C. THEREAFTER COALESCING AND SMOOTHING SAID LAYER AND FUSING SAID PARTICLES INTO A CONTINUUM BY TREATING THE WORKPIECE WITH SAID LAYER ADHERENT THERETO WITH A HIGH-MOLECULARWEIGHT LIQUID HYDROCARBON IN WHICH SAID SYNTHETIC RESIN IS INSOLUBLE AT A TEMPERATURE ABOVE THE SOFTENING POINT OF SAID SYNTHETIC RESIN, SAID LIQUID HYDROCARBON HAVING A VISCOSITY AT 100*C GREATER THAN 10 CST; AND D. THEREAFTER COOLING THE SYNTHETIC-RESIN LAYER BY TREATING IT WITH WATER FOLLOWING STEP (C).
Claim 3
Dependent Claim
27 words
The process defined in claim 1 wherein said synthetic resin is selected from the group which consists of polyesters, polyvinylchlorides, vinylchloride-vinylacetate mixed polymers and copolymers, and polyamides.
Claim 4
Dependent Claim
15 words
The process defined in claim 1 wherein said water in step (d) is weakly alkaline.
Claim 5
Dependent Claim
16 words
The process defined in claim 3 wherein said water in step (d) further includes a detergent.
Claim 6
Dependent Claim
55 words
The process defined in claim 4 wherein said hydrocarbon is a naphthene-based or paraffin-based petrolEum cut recovered by vacuum distillation, is treated with concentrated sulfuric acid and bleaching earth, has at 100*C a kinematic viscosity of 15 to 50 cSt, and has a neutralization coefficient prior to treatment of about 0.01 to 0.5 mg KOH/g.
Claim 7
Dependent Claim
45 words
The process defined in claim 5 wherein said hydrocarbon is provided in an upper portion and said water is provided in a lower portion of a column through which said workpiece is caused to fall freely, first contacting said hydrocarbon and then contacting said water.
Claim 8
Dependent Claim
34 words
The process defined in claim 6 wherein said upper portion of said column has a height sufficient to maintain the duration of fall of the workpiece through said hydrocarbon between 10 and 40 seconds.
Claim 9
Dependent Claim
48 words
The process defined in claim 7, further comprising the step of heating said upper portion of said column substantially to a temperature in the melting range of said synthetic resin and cooling said lower portion of said column to maintain the same at a temperature of substantially 20*C.
Claim 10
Dependent Claim
28 words
The process defined in claim 8 wherein said particles are adhered to said workpiece by heating said workpiece and introducing the heated workpiece into gas entraining said particles.
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |