Perfluoropolyether block-containing organohydrogenpolysiloxane, and method for producing same

A method for producing a perfluoropolyether block-containing organohydrogenpolysiloxane represented by a formula (1), comprising an exchange reaction step of mixing:

• (a) a perfluoropolyether-organopolysiloxane block copolymer represented by a formula (11);
• (b) an organohydrogenpolysiloxane;
• and
• (c) an acid catalyst so as to cause an exchange reaction between the siloxanes of (a) and (b),
• the formula (11) being expressed as
• wherein in the formula (11), Rf is a perfluoropolyether block represented by a formula (2), W3 is independently a divalent organopolysiloxane block represented by a formula (C), W4 is independently a monovalent organopolysiloxane block represented by a formula (D), Q is a divalent linking group that may contain at least one of oxygen atom and nitrogen atom, e is a number of not smaller than 0,
• the formula (2) being expressed as
• —CzF2z(OCF2)v(OC2F4)w(OC3F6)x(OC4F8)yOCzF2z— (2)
• wherein in the formula (2), z is an integer of 1 to 4;
• v, w, x and y each represent a number of 0 to 200, provided that v+w+x+y=3 to 200;
• each repeating unit may be linear or branched, there are no restrictions on an arrangement of each repeating unit, and the arrangement may be random or block,
• the formula (C) being expressed as
• wherein in the formula (C), R1 independently represents an alkyl group having 1 to 4 carbon atoms or a phenyl group;
• c independently represents a number of 0 to 1,000, and
• the formula (D) being expressed as
• wherein in the formula (D), R1 independently represents an alkyl group having 1 to 4 carbon atoms or a phenyl group;
• R2 independently represents a hydrogen atom or an aliphatic unsaturated bond-free substituted or unsubstituted monovalent hydrocarbon group having 1 to 18 carbon atoms;
• d independently represents a number of 0 to 1,000, and
• wherein Q in the formula (11) is bonded to any of the terminal carbon atom of Rf, the terminal silicon atom of W3, or the terminal silicon atom of W4,
• the formula (1) being expressed as
• wherein in the formula (1), Rf is a perfluoropolyether block represented by a formula (2), W1 is independently a divalent organopolysiloxane block represented by a formula (A), W2 is independently a monovalent organopolysiloxane block represented by a formula (B), Q is a divalent linking group that may contain at least one of oxygen atom and nitrogen atom, g is a number of not smaller than 0,
• the formula (2) being expressed as
• —CzF2z(OCF2)v(OC2F4)w(OC3F6)x(OC4F8)yOCzF2z— (2)
• wherein in the formula (2), z is an integer of 1 to 4;
• v, w, x and y each represent a number of 0 to 200, provided that v+w+x+y=3 to 200;
• each repeating unit may be linear or branched, there are no restrictions on an arrangement of each repeating unit, and the arrangement may be random or block,
• the formula (A) being expressed as
• wherein in the formula (A), R1 independently represents an alkyl group having 1 to 4 carbon atoms or a phenyl group;
• h and i each independently represent a number of 0 to 1,000;
• there are no restrictions on an arrangement of each repeating unit, and the arrangement may be random or block, and
• the formula (B) being expressed as
• wherein in the formula (B), R1 independently represents an alkyl group having 1 to 4 carbon atoms or a phenyl group;
• R2 independently represents a hydrogen atom or an aliphatic unsaturated bond-free substituted or unsubstituted monovalent hydrocarbon group having 1 to 18 carbon atoms;
• j and k each independently represent a number of 0 to 1,000;
• there are no restrictions on an arrangement of each repeating unit, and the arrangement may be random or block, and
• wherein the number i of the hydrogensiloxane units in the formula (A) and the number k of the hydrogensiloxane units in the formula (B) shall not both be 0 at the same time;
• and Q in the formula (1) is bonded to any of the terminal carbon atom of Rf, the terminal silicon atom of W1, or the terminal silicon atom of W2.