Patent US3172407A successfully refreshed from Google Patents.
Patent US4615057A successfully refreshed from Google Patents.
US4615057A
Expired / Lapsed
US
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Process for moulding hollow articles of synthetic plastic material having an external finishing layer applied to during the moulding
Assignee: GROUPE AXINOVE SA
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Filing: 1984-02-08
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Granted: 1986-10-07
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Expires: 2004-02-08
Abstract
Abstract A process is described of coating the interior wall of a mould heated at a temperature of 130 DEG to 180 DEG C. with a dry powder of an aminoplast or phenoplast resin, in particular melamine-formaldehyde, having a grain size distribution of 10 to 100 mu , whose particles gel in contact with the walls without running, then introducing into the mould a moulding composition comprising a thermosetting resin, mineral fillers and a catalyst, hardening and polymerizing by heat and pressure the contents of the mould and releasing the article whose coating is solidly anchored in the moulding composition. Sanitary ware articles of polyester-based substrate and melamine-formaldehyde-based coating, and refrigerator boxes consisting of polyurethane foam substrate and melamine-formaldehyde coating can be produced.
Inventors
- 👤 Jean Favreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:58
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/0025; B29C37/0028; B29C37/0032; B29C41/00; B29C41/02; B29C41/08; B29C2037/0039; B29K; B29K2061/00; B29K2061/20; B29K2075/00; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
A process for molding a hollow synthetic plastic article which comprises coating the interior wall of a mold with a dry resin powder by spraying onto said wall which has been heated to a temperature of 130 to 180 degrees C. a dry powder aminoplast or phenolplast polycondensation resin whose particles gel in contact with said wall without running, introducing into the molding composition consisting essentially of a polyester resin, mineral filler and catalyst, positioning a counter-mold on the mold thus filled, hardening and polymerizng the contents of the mold by the application of heat and pressure, and recovering the resulting moulded article from the mold, whereby the aminoplast or phenoplast coating is solidly anchored to the molding composition substrate.
Claim 2
Dependent Claim
120 words
A process for molding a hollow synthetic plastic article which comprises coating the interior wall of a mold with a dry resin powder by spraying onto said wall which has been heated to a temperature of 130 to 180 degrees C. a dry powder aminoplast or phenolplast polycondensation resin whose particles gel in contact with said wall without running, introducing into the molding composition consisting essentially of a polyester resin, mineral filler and catalyst, positioning a counter-mold on the mold thus filled, hardening and polymerizng the contents of the mold by the application of heat and pressure, and recovering the resulting moulded article from the mold, whereby the aminoplast or phenoplast coating is solidly anchored to the molding composition substrate.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the aminoplast or phenoplast is a melamine-formaldehyde, urea-formaldehyde or phenol-formaldehyde resin.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein the aminoplast or phenoplast is a melamine-formaldehyde resin containing a polyamide monomer, carbohydrate or polyvalent alcohol plasticizer.
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein said plasticizer is caprolactam and the melamine-formaldehyde dry powder has a softening point between 130 ° and 170° C.
Claim 6
Dependent Claim
19 words
The process of claim 3 wherein said molding composition contains as an accelerator, 1 to 3% diamonium imido sulfonate.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the accelerator is used in a quantity such that the hardening time is less than one minute.
Claim 8
Dependent Claim
19 words
The process of claim 2 wherein said dry powder has a grain size distribution of 10 to 100 microns.
Claim 9
Dependent Claim
15 words
The process of claim 6 wherein the grain size distribution is 10 to 50 microns.
Claim 10
Dependent Claim
21 words
The process according to claim 2 in which more than one layer of said dry powder is sprayed on said walls.
Claim 11
Dependent Claim
20 words
The process according to claim 2 in which said mineral filler is calcium carbonate, silica particles or micro glass beads.
Claim 12
Dependent Claim
12 words
The process of claim 2 wherein said molding composition contains a colorant.
Claim 13
Dependent Claim
30 words
The process of claim 2 wherein after a crystalline, white powder of melamine-formaldehyde resin is coated on said walls, at least one layer of the different color is applied thereto.
Claim 14
Dependent Claim
29 words
The process of claim 2 wherein a crystalline, white powder of melamine-formaldehyde resin is sprayed on said walls and wherein said substrate has a decorative design on its surface.
Claim 15
Dependent Claim
28 words
The process of claim 1 wherein the dry resin powder is applied in an amount such that the resulting layer thereof has a thickness less than 120 microns.
Claim 16
Dependent Claim
20 words
The method of claim 9, wherein each layer of said dry powder has a thickness of less than 120 microns.
Claim 17
Dependent Claim
15 words
The process of claim 2 wherein the molding composition comprises resin impregnated glass fiber mat.
Claim 18
Dependent Claim
26 words
A sanitary wear article consisting essentially of a thermosetting resin based substrate having an aminoplast or phenoplast-based coating thereon prepared by the process of claim 1.
Claim 19
Dependent Claim
20 words
The sanitary wear article of claim 17 in which said aminoplast or phenoplast based coating is a melamine-formaldehyde based coating.
References Cited (Backward Citations)
GB1420867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |