US4710400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process for conferring conductor, antistatic and flame-proofing properties to porous materials
Assignee: University of Parma
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Filing: 1986-06-20
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Granted: 1987-12-01
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Expires: 2006-06-20
Abstract
Abstract A solid, composite and conductor material is obtained by impregnating an impregnable solid with a pyrrolic compound, and bringing the so-impregnated solid into contact with an oxidizer solution, so to cause a pyrrolic polymer to form inside the solid material.
Inventors
- 👤 Gian P. Gardini
- 👤 Vittorio Bocchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:23
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/12; C08G61/122; C08G61/123; C08G61/124; D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/18; D21H17/19; H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/127
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A process for the preparation of a thin film of a conductive, solid, microporous composite material comprising: contacting one face of the composite material with a compound selected from pyrrole, N-methylpyrrole and 3,4-dimethylpyrrole until said material is impregnated with said compound; contacting only the opposed face of the impregnated material with an oxidizing solution to thereby cause the compound to polymerize only on the opposed face of the impregnated material; and washing the impregnated material having the pyrollic polymer on the opposed face to remove residual oxidizing solution.
Claim 2
Dependent Claim
88 words
A process for the preparation of a thin film of a conductive, solid, microporous composite material comprising: contacting one face of the composite material with a compound selected from pyrrole, N-methylpyrrole and 3,4-dimethylpyrrole until said material is impregnated with said compound; contacting only the opposed face of the impregnated material with an oxidizing solution to thereby cause the compound to polymerize only on the opposed face of the impregnated material; and washing the impregnated material having the pyrollic polymer on the opposed face to remove residual oxidizing solution.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein the microporous material is selected from plastics and elastomeric materials.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein the microporous material is selected from polyethylene, polypropylene, natural rubber and synthetic rubber.
Claim 5
Dependent Claim
32 words
The process of claim 1, wherein the step of contacting said one face of the microporous material with said compound is conducted at a temperature of from -20° C. to 80° C.
Claim 6
Dependent Claim
32 words
The process of claim 4 wherein the step of contacting said one face of the microporous material with said compound is conducted at a temperature of from 0° C. to room temperature.
Claim 7
Dependent Claim
53 words
The process of claim 1 wherein the oxidizing solution is selected from an aqueous solution of a ferric halide; an aqueous solution of hydrogen halide or related salt and an oxidizer selected from potassium bichromate, hydrogen peroxide and an alkali-metal persulfate; and an organic solvent solution containing at least one halogen containing compound.
Claim 8
Dependent Claim
12 words
The process of claim 6, wherein the ferric halide is ferric chloride.
Claim 9
Dependent Claim
17 words
The process of claim 6, wherein the organic solvent solution contains iodine and chlorine in methylene chloride.
Claim 10
Dependent Claim
50 words
The process of claim 1, wherein the step of contacting the impregnated material with the oxidizing solution to thereby cause polymerization on the opposed face is carried out at a temperature of from -20° C. to 80° C. for 0.5 to 100 hours and preferably from 1 to 12 hours.
Claim 11
Dependent Claim
27 words
The process of claim 9, wherein the polymerization step is carried out at a temperature of from 0° C. to room temperature for 1 to 12 hours.
Claim 12
Dependent Claim
18 words
The process of claim 1, wherein the washing step is carried out with water and an organic solvent.
Claim 13
Dependent Claim
11 words
The process of claim 11, wherein the organic solvent is acetone.
Claim 14
Dependent Claim
12 words
The process of claim 1 further comprising drying the washed impregnated material.
Claim 15
Dependent Claim
23 words
The process of claim 13, wherein the drying step is carried out at a temperature of from room temperature to about 100° C.
References Cited (Backward Citations)
US4617228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |