Electrically conductive polymeric foams and elastomers and methods of manufacture thereof
First Claim
1. A composition comprising a polymeric foam;
- and carbon nanotubes, wherein the composition has a volume resistivity of about 10−
3 ohm-cm to about 108 ohm-cm.
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Accused Products
Abstract
An electrically conductive composition comprises a polymeric foam and carbon nanotubes. The composition has a volume resistivity of about 10−3 ohm-cm to about 108 ohm-cm. In another embodiment, an electrically conductive elastomeric composition comprises an elastomer and carbon nanotubes, and has a volume resistivity of about 10−3 ohm-cm to about 103 ohm-cm. The polymeric foams and elastomers retain their desirable physical properties, such as compressibility, flexibility and compression set resistance. They are of particular use as that articles provide electromagnetic shielding and/or electrostatic dissipation, especially for applications involving complicated geometries, such as in computers, personal digital assistants, cell phones, medical diagnostics, and other wireless digital devices, electronic goods such as cassette and digital versatile disk players, as well as in automobiles, ships and aircraft, and the like, where high strength to weight ratios are desirable.
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Citations
24 Claims
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1. A composition comprising
a polymeric foam; - and
carbon nanotubes, wherein the composition has a volume resistivity of about 10−
3 ohm-cm to about 108 ohm-cm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- and
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14. A composition comprising
an elastomer; - and
carbon nanotubes, wherein the composition has a volume resistivity of about 10−
3 ohm-cm to about 103 ohm-cm. - View Dependent Claims (15, 16, 17, 18, 19)
- and
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20. A method of manufacturing a polymeric foam, comprising:
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frothing a liquid composition comprising a polyisocyanate component, an active hydrogen-containing component reactive with the polyisocyanate component, a surfactant, a catalyst, and carbon nanotubes; and
curing the froth to produce a polyurethane foam having a density of about 1 to about 50 pounds per cubic foot, an elongation of greater than or equal to about 20% and a compression set of less than or equal to about 30.
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21. A method of manufacturing a polymeric foam comprising:
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extruding a mixture comprising an essentially linear single site initiated polyolefin, carbon nanotubes, a blowing agent and an optional curing agent; and
blowing the mixture to produce a foam having a density of about 1 to about 20 pounds per cubic foot, an elongation of greater than or equal to about 100% and a compression set of less than or equal to about 70. - View Dependent Claims (22)
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23. A method of manufacturing a polymeric foam comprising:
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extruding a mixture comprising a polysiloxane polymer having hydride substituents, carbon nanotubes, a blowing agent and a platinum based catalyst; and
blowing the mixture to produce a silicone foam having a density of about 4 to about 30 pounds per cubic foot, an elongation of greater than or equal to about 50% and a compression set at 50% of less than or equal to about 30.
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24. A method of manufacturing a polymeric foam comprising:
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metering a composition comprising a polysiloxane polymer having hydride substituents, carbon nanotubes, a blowing agent and a platinum based catalyst into a mold or a continuous coating line; and
foaming the composition in the mold or on the continuous coating line.
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Specification