Method of making a conductive polymer composition

Details Method of making a conductive polymer composition Method of making a conductive polymer composition

1997-11-12

1999-11-16

Cain, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524496, C08K 300

Patent

active

059859768

ABSTRACT:
A conductive polymer composition which has a resistivity at 20.degree. C. of at most 1.0 ohm-cm and a PTC anomaly of at least 104 contains at most 64% by volume of a crystalline polymeric component and at least 36% by volume of a particulate conductive filler. A preferred conductive filler is carbon black having a DBP number of 60 to 120 cm.sup.3 /100 g. Compositions of the invention, as well as other conductive polymer compositions are preferably prepared by a method in which the polymeric component and the filler are blended in a first step at a temperature greater than the melting temperature of the polymer, the mixture is then cooled, and the mixture is then mixed in a second step. The resulting composition has a PTC anomaly that is at least 1.2 times the PTC anomaly of the first mixture.

REFERENCES:
patent: 3243753 (1966-03-01), Kohler
patent: 3351882 (1967-11-01), Kohler et al.
patent: 3976600 (1976-08-01), Meyer
patent: 4237441 (1980-12-01), Van Konynenburg et al.
patent: 4388607 (1983-06-01), Toy et al.
patent: 4534889 (1985-08-01), Van Konynenburg et al.
patent: 4545926 (1985-10-01), Fouts et al.
patent: 4560498 (1985-12-01), Horsma et al.
patent: 4591700 (1986-05-01), Sopory
patent: 4689475 (1987-08-01), Matthiesen
patent: 4724417 (1988-02-01), Au et al.
patent: 4774024 (1988-09-01), Deep et al.
patent: 4800253 (1989-01-01), Kleiner et al.
patent: 4935156 (1990-06-01), Van Konynenburg et al.
patent: 5049850 (1991-09-01), Evans et al.
patent: 5089801 (1992-02-01), Chan et al.
patent: 5174924 (1992-12-01), Yamada
patent: 5250228 (1993-10-01), Baigrie et al.
patent: 5378407 (1995-01-01), Chandler et al.
patent: 5436609 (1995-07-01), Chan et al.
patent: 5451919 (1995-09-01), Chu et al.
patent: 5801612 (1998-09-01), Chandler et al.
D. Bulgin, "Electrically Conductive Rubber", Transactions I.R.I., vol. 21, pp. 181-218 (1945). See, in particular, p. 196.
J. Meyer, "Glass Transition Temperature as a Guide to Selection of Polymers Suitable for PTC Materials", Polymer Engineering and Science, vol. 13, No. 6, pp. 462-468, Nov. 1973.
J. Meyer, "Stability of Polymer Composites as Positive-Temperature-Coefficient Resistors", Polymer Engineering and Science, vol. 14, No. 10, pp. 706-716, Oct. 1974.
Search Report for International application No. PCT/US96/03475, mailed Oct. 2, 1996.
U.S. application No. 07/910,950, Graves et al., filed Jul. 9, 1992.
U.S. application No. 08/121,717, Siden et al., filed Sep. 15, 1993.
U.S. application No. 08/242,916, Zhang et al., filed May 13, 1994.
U.S. application No. 08/255,497, Chu et al., filed Jun. 8, 1994.
U.S. application No. 08/255,584, Chandler et al., filed Jun. 8, 1994.

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