Abstract: Provided are modified carboxyl-terminated polyorganosiloxanes having a mean molecular weight of from 500 to 120,000 and represented by the following formula (1), and a method for producing them. The modified polyorganosiloxanes have a carboxyl group at one terminal position, and have a polyoxyalkylene moiety in the center of the molecular chain. They are highly miscible with various polar solvents and monomers. The method for producing them comprises reacting a polyorganosiloxane having a hydroxyl group at one terminal position and having a polyoxyalkylene moiety in the center of the molecular chain, with a cyclic acid anhydride having a specific structure, and it does not require plural reaction steps. In the method, various types of carboxyl-terminated polyorganosiloxanes can be easily produced, depending on the type of the cyclic acid anhydride used.

Abstract: The present invention relates to polymerizable terminal group-containing polyorganosiloxane having a number average molecular weight of 500 to 100000 represented by the following Formula (1): wherein R1, R2, R3, R4 and R5 each represent a linear or branched alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 4 to 10 carbon atoms or an aryl-containing group having 6 to 10 carbon atoms; R6 represents a hydrogen atom, a linear or branched alkyl group having 1 to 5 carbon atoms or an aryl-containing group having 6 to 10 carbon atoms; n represents 1 or more and m represents 0 or more, in which n+m represents an average polymerization degree and is 4 to 1100; X represents an alkylene group having 2 to 20 carbon atoms; Y represents —OCH2CH2—, —OCH(CH3)CH2— or —OCH2CH(CH3)—; p represents 3 or more; and Z represents an alkylene group having 1 to 20 carbon atoms.

Abstract: Provided is a novel mercaptomethylphenyl group-containing diorganopolysiloxane compound represented by the following Formula (1): wherein R1 represents methyl or phenyl; R2 represents a linear or branched alkyl group having 1 to 6 carbon atoms, a phenyl group or A; l represents an integer of 0 to 500; m represents an integer of 0 to 1,000; n represents an integer of 0 to 500; p represents an integer of 0 to 2; and A is a group represented by Formula (2): wherein X represents a linear or branched alkylene group having 2 to 20 carbon atoms; at least one of R3, R4, R5, R6 and R7 represents mercaptomethyl, and the remaining groups each represent a hydrogen atom or a linear or branched alkyl group having 1 to 20 carbon atoms.