Abstract: A polyolefin resin composition which comprises:(A) a polyolefin,(B) 0.1 to 100 parts of a core-shell graft copolymer prepared by graft copolymerizing (b) 5 to 60 parts by weight of a monomer component comprising a copolymerizable vinyl compound selected so that the glass transition temperature of a polymer of said monomer component alone is not less than 25.degree. C., onto (a) 40 to 95 parts by weight of a crosslinked rubber-like polymer having a glass transition temperature of not more than 25.degree. C., and(C) 0 to 400 parts of an inorganic filler, said parts of (B) and (C) being parts by weight per 100 parts by weight of (A). The above-mentioned polyolefin resin composition shows the excellent processability, impact resistance, rigidity and surface property.

Abstract: The invention provides a tubular membrane separation apparatus useful for ultrafiltration and reverse osmosis. A tubular separation element (1) is fitted in a porous pressure-resistant tube (2) which is inserted in a liquid collector tube (3) of larger diameter. The collector tube (3) is detachably connected to connector tubes (6) by joints (4). Each end of the separation element (1) is held between the inner surface of the joint (4) and the end of the connector tube (6) and thereby sealed. The separation element (1) is replaceable, and the apparatus can be disassembled for cleaning.