Abstract: Vinyl chloride series resin compositions comprising (a) 90 to 50 parts by weight vinyl chloride series resins and (b) 10 to 50 parts by weight of graft polymers obtained by polymerizing (i) 20 to 65 weight percent butadiene series rubber, (ii) 20 to 50 weight percent vinyl aromatic hydrocarbon, (ii) 10 to 50 weight percent methyl methacrylate, (iii) 2 to 50 weight percent acrylic ester, and (iv) 0 to 40 weight percent acrylonitrile.

Abstract: An internal combustion engine has at the intake system thereof an electronically controlled carburetor operable to control the air-fuel ratio of the air-fuel mixture supplied into combustion chambers of the engine in accordance with the composition of the exhaust gases exhausted from the engine, and at the exhaust system thereof a three-way catalytic converter. The internal combustion engine further has at the intake system thereof a thermostatically controlled air filter system which is designed to keep the air entering the intake system at generally constant temperature.