STABILIZATION SYSTEMS FOR POLYACETALS
The invention concerns a blend of: (a) a phenolic antioxidant such as a compound of the formula R1X(CaH2a)-Q in which R1 represents in which X represents oxygen or sulfur, a is an integer from 6 to 30, b is an integer from 0 to 6, R2 and R3 are independently C1-C18 alkyl, C5-C12 cycloalkyl, phenyl o...
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Zusammenfassung: | The invention concerns a blend of: (a) a phenolic antioxidant such as a compound of the formula R1X(CaH2a)-Q in which R1 represents in which X represents oxygen or sulfur, a is an integer from 6 to 30, b is an integer from 0 to 6, R2 and R3 are independently C1-C18 alkyl, C5-C12 cycloalkyl, phenyl or C7-C9 aralkyl and R2 may also be hydrogen, Q is hydrogen or A-(CyH2y)-R4, A is oxygen, sulfur or -N-, y is an integer from 2 to 20, B is C1-C4 alkyl or C1-C4 alkanoyl and R4 is hydrogen, hydroxy, C1-C4 alkanoyloxy or a group of the formula wherein R2, R3 and b is as defined above; and (b) a hydrazine compound such as a compound of the formula in which R12 is a group such as C1-C18alkyl, C1-C18 alkyloxy, phenyl, C7-C9 aralkyl; or (c) an oxamido compound of the formula in which R15 is a group such as C1-C18 alkyl, phenyl, C7-C9 aralkykl and v is an integer from 0 to 6; the weight ratio of the components (a):(b) or (a):(c) is 20:1 to 1:10. This blend is useful in reducing colour formation in acetal homo or copolymers containing component (a). |
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