Conductive polyurethane foam containing picric acid and analog thereof
First Claim
1. A three dimensional electrically conductive plastic foam structure comprising a polyurethane foam containing an effective amount for lowering the volume resistivity of said foam of a charge transfer agent selected from the group consisting of picric acid and analogs thereof.
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Accused Products
Abstract
An electrically conductive polyurethane foam product is prepared by the in situ combination of polyurethane-forming reactants and an effective amount of a charge transfer agent selected from the group consisting of tetracyanoethylene (TCNE), picric acid and analogs thereof, for lowering electrical resistance of the foam product to less than 1×1012 ohms. In a preferred embodiment, the conductive foam product is reticulated to a void volume of more than 80% after completion of the foam forming reaction.
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Citations
40 Claims
- 1. A three dimensional electrically conductive plastic foam structure comprising a polyurethane foam containing an effective amount for lowering the volume resistivity of said foam of a charge transfer agent selected from the group consisting of picric acid and analogs thereof.
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2. A three dimensional electrically conductive plastic foam structure comprising a polyurethane foam containing an effective amount for lowering the volume resistivity of said foam of picric acid.
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14. A three dimensional electrically conductive structure having a volume resistivity of less than 1012 ohm cm, comprising
a polyurethane foam containing an effective amount for reducing the electrical resistance of said foam to less than 1012 ohm cm of a charge transfer agent selected from the group consisting of picric acid and analogs thereof, incorporated into said foam in situ.
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19. A three dimensional electrically conductive plastic foam structure comprising a polyurethane foam containing an effective amount for lowering the volume resistivity of said foam of a charge transfer agent selected from the group consisting of
picric acid, 2,4-dinitrophenol, 2,5-dinitrophenol, 4-nitrophenol, 4-cyanophenol, 3-nitrophenol, 2,4,-dinitroanisol, 2-nitrophenol, 2-hydroxyacetophenone, 4-hydroxyacetophenone, 4-nitroanisol, 4-aminoacetopheone, 4-nitrobenzyl alcohol, 2-anitroaniline, 2,4-dihdroxyacetophenone, 4-nitrocatechol, 2-nitro-1-naphthol, 4-nitrobenzophenone, 4-nitrobenzaldehyde, 5-nitroanthranilonitrile, 2,6-dinitrocresol, 4-nitroaniline, 2,4-dinitroaniline, 2-nitroanisole, 4-nitrobenzonitrile, 4-nitroacetanilide, and 2,4-dinitro-1-naphthol sodium salt dihydrate.
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21. 4-dinitroanisol,
2-nitrophenol, 2-hydroxyacetophenone, 4-hydroxyacetophenone, 4-nitroanisol, 4-aminoacetopheone, 4-nitrobenzyl alcohol, 2-nitroaniline, 2,4-dihdroxyacetophenone, 4-nitrocatechol, 2-nitro-1-naphthol, 4-nitrobenzophenone, 4-nitrobenzaldehyde, 5nitroanthranilonitrile, 2,6-dinitrocresol, 4-nitroaniline, 2,4-dinitroaniline, 2-nitroanisole, 4-nitrobenzonitrile, 4-nitroacetanilide, and 2,4-dinitro-1-naphthol sodium salt dihydrate.
- 23. A thermosetting plastic foam composition having a volume resistivity of 1012 ohm cm or less comprising the product obtained by reacting a polyol reactant selected from the group consisting of polyester polyols, polyether polyols, mixtures of polyether and polyester polyols and mixtures of polyether polyols and copolymer polyols with an isocyanate reactant in the presence of a charge transfer agent selected from the group consisting of picric acid and analogs thereof.
- 30. A three dimensional electrically conductive plastic foam structure comprising a polyurethane foam containing an effective amount for lowering the volume resistivity of said foam of a charge transfer agent selected from the group consisting of a compound of the formula
- space="preserve" listing-type="equation">AR--X.sup.m --Y.sup.n,
where AR is a radical selected from the group consisting of benzene, toluene and naphthalene; X is selected from the group consisting of OH, OCH3, CH2 OH, NH2, NHCOCH3, CN, and O-M, where M is selected from the group consisting of an alkalai metal salt of sodium and of potassium; Y is selected from the group consisting of NO2 and COCH3 ; m is an integer of 1 to 2; and n is an integer from 1 to 3.
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32. A method of preparing an electrically conductive polyurethane foam composition which comprises:
reacting at least one polyester or polyether polyol with an isocyanate compound in the presence of an effective amount for lowering the electrical resistance of said polyurethane foam of a charge transfer agent selected from the group consisting of picric acid and analogs thereof under foam forming conditions. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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40. A method of preparing an electrically conductive polyurethane foam composition having an electrical resistance of 1012 ohm cm or less comprising the steps of:
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reacting at least one graft polyol with toluene diisocyanate in the presence of water, an amine catalyst, a tin catalyst, a cell control agent and an effective amount for lowering the electrical resistance of said foam of a charge transfer agent selected from the group consisting of picric acid and analogs thereof in a suitable solvent under foam forming conditions; and reticulating said foam to a void volume of more than 80%.
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Specification