Hindered silicon ester stabilizers

Details Hindered silicon ester stabilizers Hindered silicon ester stabilizers

C - Chemistry, Metallurgy

07

F

402/25, 400/7065

C07F 7/18 (2006.01) C08G 77/52 (2006.01) C08K 5/54 (2006.01) C08K 5/5415 (2006.01) C09K 15/32 (2006.01)

Patent

CA 1307286

- 1 - Case 3-15499/=/CGC 1149 HINDERED SILICON ESTER STABILIZERS Abstract of the Disclosure Compounds of the formulae I and II Image (I) Image (II) wherein R1, R2, R3, R4 and R5 are independently hydrogen, alkyl or 1 to 18 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, aralykyl of 7 to 9 carbon atoms or said aralykyl substituted by alkyl of 1 to 12 carbon atoms, 2 21489-6979 R6 and R7 are independently alkyl having 1 to 30 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, aralkyl of 7 to 9 carbon atoms or said aralkyl substituted by alkyl of 1 to 12 carbon atoms; A is a direct bond, a methylene or an ethylene radical; B is an alkylene radical of 2 to 10 carbon atoms, the radical of formula -CH2CH2-S-CH2CH2- or of the formula III -CH2CH2-(O-CH2CH2)m- (III), wherein m is an integer from 1 to 4, B also denotes a phenylene radical or a biphenylene radical interrupted by an oxygen or a sulfur atom or by the group of formula -C(CH3)2-; and n is an integer from 2 to 100. The compounds are useful as stabilizers against thermo-oxidative and/or light-induced degradation of polymers.

517518

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