Patent ID: 7683112

Claim:
A phosphite composition comprising 100 parts by weight of a phosphite represented by the formula (1): wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrogen atom, an alkyl group of 1 to 8 carbon atoms, a cycloalkyl group of 5 to 8 carbon atoms, an alkylcycloalkyl group of 6 to 12 carbon atoms, an aralkyl group of 7 to 12 carbon atoms or a phenyl group, R 3 represents a hydrogen atom or an alkyl group of 1 to 8 carbon atoms, X represents a single bond, a sulfur atom or a —CHR 6 — group, in which R 6 represents a hydrogen atom, an alkyl group of 1 to 8 carbon atoms or a cycloalkyl group of 5 to 8 carbon atoms, A represents an alkylene group of 2 to 8 carbon atoms or a *—COR 7 — group, in which R 7 represents a single bond or an alkylene group of 1 to 8 carbon atoms, and the symbol * represents a point being linked with the oxygen atom of the >P—O— group in the formula (1), one of Y and Z represents a hydroxyl group, an alkoxy group of 1 to 8 carbon atoms or an aralkyloxy group of 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group of 1 to 8 carbon atoms, when Y is a hydroxyl group, one of R 4 and R 5 represents an alkyl group of 3 to 8 carbon atoms, a cycloalkyl group of 5 to 8 carbon atoms, an alkylcycloalkyl group of 6 to 12 carbon atoms, an aralkyl group of 7 to 12 carbon atoms or a phenyl group, and R 1 , R 2 and R 3 may be the same or different; and 0.5 to 8 parts by weight of an aliphatic hydrocarbon lubricant having a softening point or a melting point of not higher than 115° C., wherein the content of the phosphite represented by the formula (1) in said composition is 30 to 99.5% by weight, wherein the composition is a granular composition, and wherein the composition comprises not more than 10% by weight of components having a particle diameter of not more than 45 μm.