| abstract |
PURPOSE: To prepare a curable compsn. which gives a cured article excellent in resistance to heat and weathering by compounding an oxypropylene polymer having reactive silicon groups with an antioxidant. n CONSTITUTION: An oxypropylene polymer having a main chain consisting of repeating units of formula I, silicon groups having hydroxyl or hydrolyzable groups directly attached to the silicon atoms [e. g. groups of formula II (wherein R 1 and R 2 are each 1-20C alkyl, 6-20C aryl, 7-20C aralkyl, etc.; X is OH or a hydrolyzable group; and a is 0-3, b is 0-2, and m is 0-19 provided that a+Σb≥1)], a ratio of Mw/Mn of 1.6 or lower, and a number-average mol.wt. of 6000 or highr is compounded with an antioxidant (e. g. a hindered phenol or a hindered amine antioxidant) to give a curable compsn., which gives a cured article excellent in resistance to heat and weathering. n COPYRIGHT: (C)1992,JPO&Japio |