Patent US3079850A successfully refreshed from Google Patents.
Patent US4983275A successfully refreshed from Google Patents.
Patent US3814220A successfully refreshed from Google Patents.
US4778636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing electrically conductive pressure-formed plates comprised of plastic material
Assignee: Roehm GmbH Darmstadt
•
Filing: 1986-11-28
•
Granted: 1988-10-18
•
Expires: 2006-11-28
Abstract
Abstract The invention relates to a method of manufacturing plastic, electrically conductive pressure-formed plates from thermoplastic plastic particles which are mechanically formed. In this method, mechanically formed, thermoplastic particles, each particle having maximum particle diameter in the range of about 1 mm to about 10 mm in the middle of the particle, are mechanically mixed with an amount of at least one electric-current-conducting substance sufficient to provide electrical conductivity. The electric-current-conducting substance is furnished in the form of a plurality of particulate, electrically conducting solid bodies, said mixing being effected in the temperature region below the glass temperature (Tg) of the thermoplastic plastic material of which the thermoplastic particles are comprised. The mixture thus produced is compressed to form plastic pressure-formed plates by means of a pressure-forming device.
Inventors
- 👤 Manfred Krieg
- 👤 Armin Meyer
- 👤 Winfried Wunderlich
- 👤 Rainer Friederich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:55
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/001; B29C; B29C70/00; B29C70/88; B29C70/882; B29D7/00; H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; B29C43/00; B29K; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/25; B29K2105/251; B29K2995/00; B29K2995/0003; B29K2995/0005
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
100 words
A method of manufacturing plastic, electrically conductive plates, comprising the steps of: (a) mixing mechanically formed thermoplastic particles, wherein greater than 60% of said particles have a particle size diameter of 3-5 mm, with a dispersion, said dispersion comprising an amount of at least one electric-current-conducting substance sufficient to provide electrical conductivity and a liquid vehicle; and (b) pressure-forming the mixture produced from said mixing step; wherein said electric-current-conducting substance is in the form of a plurality of electrically conducting solid bodies, and wherein said mixing step is performed at a temperature below the glass temperature of said thermoplastic particles.
Claim 2
Independent Claim
100 words
A method of manufacturing plastic, electrically conductive plates, comprising the steps of: (a) mixing mechanically formed thermoplastic particles, wherein greater than 60% of said particles have a particle size diameter of 3-5 mm, with a dispersion, said dispersion comprising an amount of at least one electric-current-conducting substance sufficient to provide electrical conductivity and a liquid vehicle; and (b) pressure-forming the mixture produced from said mixing step; wherein said electric-current-conducting substance is in the form of a plurality of electrically conducting solid bodies, and wherein said mixing step is performed at a temperature below the glass temperature of said thermoplastic particles.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein said mixing temperature is from about 15° C. to less than the glass temperature of said thermoplastic particles.
Claim 4
Dependent Claim
12 words
The method of claim 2, wherein said mixing temperature is room temperature.
Claim 5
Dependent Claim
23 words
The method of claim 1, wherein said thermoplastic particles are comprised of a plastic material which does not have any partially crystalline constituents.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein said thermoplastic particles are comprised of an acrylic resin.
Claim 7
Dependent Claim
30 words
The method of claim 1, wherein said electric-current-conducting substance is present in the amount of about 0.01 to about 20 wt. % based on the weight of said thermoplastic particles.
Claim 8
Dependent Claim
34 words
The method of claim 1, wherein said electric-current-conducting substance has a mean particle diameter in the range of about 0.0001 to less than about 0.5 times the mean particle diameter of said thermoplastic particles.
Claim 9
Dependent Claim
14 words
The method of claim 1, wherein said electric-current-conducting substance is electrically conducting carbon black.
Claim 10
Dependent Claim
20 words
The method of claim 8, wherein said carbon black is present in the amount of about 0.1-10 wt. % .
Claim 11
Dependent Claim
20 words
The method of claim 9, wherein said carbon black is present in the amount of about 0.1-5 wt. % .
Claim 12
Dependent Claim
19 words
The method of claim 8, wherein the surface-to-weight ratio of said carbon black is about 50-1500 m 2 /g.
Claim 13
Dependent Claim
12 words
The method of claim 1, wherein said electric-current-conducting substance is a metal.
Claim 14
Dependent Claim
11 words
The method of claim 1, wherein said electric-current-conducting substance is graphite.
Claim 15
Dependent Claim
20 words
The method of claim 1, wherein said electric-current-conducting substance has a particle size in the range of about 1-500 micron.
Claim 16
Dependent Claim
17 words
The method of claim 14, wherein said particle size is in the range of about 15-300 micron.
Claim 17
Dependent Claim
23 words
The method of claim 1, further comprising: adding at least one inert additive in an amount up to about 50 wt. % .
Claim 18
Dependent Claim
12 words
The method of claim 16, wherein said inert additive is a pigment.
Claim 19
Dependent Claim
31 words
The method of claim 16, wherein said inert additive is at least one member selected from the group consisting of aluminum oxides, silicon dioxide, inorganic carbonates, sulfates, sulfides, phosphates and oxides.
Claim 20
Dependent Claim
17 words
The method of claim 1, wherein said thermoplastic particles are colored with organic dyes or other colorants.
Claim 21
Dependent Claim
16 words
The method of claim 1, wherein said mixing step is performed as a fluidized bed process.
Claim 22
Dependent Claim
16 words
The method of claim 1, wherein said mixing step is conducted in a rotary coating vessel.
Claim 23
Dependent Claim
28 words
The method of claim 1, wherein said liquid vehicle comprises at least one member selected from the group consisting of a solvent, a binder and an emulsifier/adhesive agent.
Claim 24
Dependent Claim
14 words
The method of claim 22, wherein said binder comprises a low molecular weight polymer.
References Cited (Backward Citations)
US2683669A
Cited
GB723598A
Cited
US2761854A
Cited
GB858530A
Cited
GB823599A
Cited
GB929733A
Cited
US3003975A
Cited
US3733385A
Cited
GB1261560A
Cited
US4051075A
Cited
US4350652A
Cited
EP0013753B1
Cited
US4399061A
Cited
US4596669A
Cited
US4592861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |