Abstract: Provided is a polyolefin base porous film comprising a polyolefin composition in which calcium carbonate particles, preferably calcium carbonate particles subjected to surface treatment with chain carboxylic acid having 3 to 6 carbon atoms are dispersed. This polyolefin base porous film is characterized by that the leached solution with water has a pH which falls in the vicinity of neutrality and has a low stimulation to the skin, and therefore it is useful for goods contacting human bodies, particularly a back sheet for a sanitary napkin.

Abstract: Disclosed is a polypropylene composition comprising (a) 100 parts by weight of a propylene copolymer, (b) 0.01 to 0.5 part by weight of a heat stabilizer and (c) 0.1 to 10 parts by weight of a diphenyl ether compound represented by the following general formula: ##STR1## wherein R.sub.1 stands for an unsubstituted phenyl group or a phenyl group substituted with an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 10 to 30 carbon atoms, R.sub.2 stands for an unsubstituted phenoxy group or a phenoxy group substituted with an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 10 to 30 carbon atoms, and m and n stand for an integer of from 0 to 4, with the proviso that the case where each of m and n is 0 is excluded.