Patent ID: 8148565

Claim:
A method of manufacturing an organic silicon compound that contains a methacryloxy group or an acryloxy group, wherein said organic silicon compound that contains a methacryloxy group or an acryloxy group is a compound represented by the following formula (3): CH 2 ═C(R 5 )COO—R 6 —Si(R 7 ) 3-p (R 8 ) p (3) (where R 5 is a hydrogen atom or a methyl group, R 6 is a bivalent organic group, R 7 is an alkyl group, and R 8 is either a halogen atom or is selected from an alkoxy group or an alkyloxyalkoxy group; and “p” is an integer from 1 to 3), the method being characterized by the fact that manufacturing or conducting purification by distillation is carried out in the presence of a phenothiazine derivative having a molecular weight equal to or higher than 240, wherein said phenothiazine derivative is a compound selected from the following: an alkyl-substituted phenothiazine with said alkyl group having four or more carbon atoms, dibenzophenothiazine, an acyl-substituted phenothiazine with said acyl group having 2 to 18 carbon atoms, an N,N′ phenothiazine dimer, a compound represented by formula (1) given below: (where R 1 is an aralkyl group having 7 to 18 carbon atoms, and R 2 is selected from a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, and an acyl group having 2 to 18 carbon atoms; “m” and “n” are integers from 0 to 2, and where the following condition is satisfied: m+n≧1), and a compound of the following formula (2): (where R 2 is the same as defined above, R 3 is either a hydrogen atom or is selected from an alkyl group having 1 to 18 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, and an acyl group having 2 to 18 carbon atoms; R 4 is either a hydrogen atom or is selected from an alkyl group having 1 to 18 carbon atoms or an acyl group having 2 to 18 carbon atoms; X is a group selected from a methylene group, α-methylmethylene group, and α-phenylmethylene group; and “r” is a number represented by an average value between 1 and 5.