Patent ID: 7867615

Claim:
A heat-resistant expanded graphite sheet, comprising an organic phosphorus compound selected from the group consisting of an organic phosphinic acid and an ester thereof, a phosphorous acid ester, and a hypophosphorous acid ester, and graphite particles consisting of compressed expanded graphite particles with respect to graphite particles, said expanded graphite particles having an expansion rate of 200 to 300 times being compressed, and said organic phosphorus compound being dispersedly contained in a proportion of 0.1 to 10% by weight in said sheet, the organic phosphinic acid or the ester thereof being represented by the following general formula (2): wherein R 4 is an alkyl group having a carbon number of 1 to 10, an aryl group having a carbon number of 6 to 18, or an aralkyl group consisting of an alkylene portion having a carbon number of 1 to 10 and an aryl portion having a carbon number of 6 to 18, and each of R 5 and R 6 is a hydrogen atom, an alkyl group having a carbon number of 1 to 10, an aryl group having a carbon number of 6 to 18, or an aralkyl group consisting of an alkylene portion having a carbon number of 1 to 10 and an aryl portion having a carbon number of 6 to 18.