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AssigneesNitto Boseki Co., Ltd., Kawasaki Steel Corporation, Mitsubishi Gas Chemical Company, Inc.
InventorsEiji Fujisawa, Yasunobu Isobe, Hiroaki Shono
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The present invention provides a short-fiber containing composition inhibited from electrostatic charging and having practical insulating properties. This composition has a volume resistivity of 10.sup.5 -10.sup.13 .OMEGA.cm and comprises 10-40 parts by weight of at least one kind of short fibers having a volume resistivity of 10.sup.-1 -10.sup.3 .OMEGA.cm and 90-60 parts by weight of a polymer or comprises 10-40 parts by weight of a mixture comprising at least one kind of short fibers having a volume resistivity of less than 10.sup.-1 .OMEGA.cm and at least one kind of short fibers having a volume resistivity of 10.sup.-1 .OMEGA.cm or more and 90-60 parts by weight of a polymer. A method for controlling the polymer composition to 10.sup.5 -10.sup.13 .OMEGA.cm in volume resistivity is also provided.
A carbon fiber-containing polymer composition having a volume resistivity of 10.sup.5 -10.sup.13 .OMEGA.cm which comprises 10-40 parts by weight of carbon fibers having a volume resistivity of 10.sup.-1 10.sup.3 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm, and 90-60 parts by weight of a polymer.
A carbon fiber-containing polymer composition having a volume resistivity of 10.sup.5 10.sup.13 .OMEGA.cm which comprises 10-40 parts by weight of a mixture comprising carbon fibers having a volume resistivity of less than 10.sup.-1 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm and carbon fibers having a volume resistivity of 10.sup.-1 10.sup.3 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm, and 90-60 parts by weight of a polymer.
A method for controlling the volume resistivity of a polymer composition to 10.sup.5 -10.sup.13 .OMEGA.cm which comprises incorporating carbon fibers having a volume resistivity of 10.sup.-1 -10.sup.3 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm into a polymer.
A method for controlling the volume resistivity of a polymer composition to 10.sup.5 -10.sup.13 .OMEGA.cm which comprises incorporating into a polymer a mixture comprising carbon fibers having a volume resistivity of less than 10.sup.-1 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm and carbon fibers having a volume resistivity of 10.sup.-1 -10.sup.3 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm.
A method for controlling the volume resistivity of a polymer composition to a specific value in the range of 10.sup.5 -10.sup.13 .OMEGA.cm which comprises incorporating carbon fibers having a volume resistivity of less than 10.sup.-1 -10.sup.3 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm into a polymer.
A method for controlling the volume resistivity of a polymer composition to a specific value in the range of 10.sup.5 -10.sup.13 .OMEGA.cm which comprises incorporating into a polymer a mixture comprising carbon fibers having a volume resistivity of less than 10.sup.-1 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.mm-5 cm and carbon fibers having a volume resistivity of 10.sup.-1 -10.sup.3 .OMEGA.cm and having a diameter of 3-25 .mu.m and a length of 10 .mu.m-5 cm.
Dependencies are inferred from the claim text.