Polyurethane and manufacturing method therefor, master batch, ink binder, ink composition, thermoplastic polymer composition for molding, molded body, and composite molded body and manufacturing method therefor

1. A polyurethane block copolymer having (I) a block derived from a polyurethane comprising polyol units and organic polyisocyanate units, wherein said polyol units contain a polyol unit having an alkenyl group-containing organopolysiloxane structure, and (II) a block derived from an additional block copolymer having (A) a polymer block containing an aromatic vinyl compound unit and (B) a copolymer block containing a conjugated diene unit, or a hydrogen additive of said addition block copolymer, wherein a ratio of said alkenyl group-containing organopolysiloxane structure contained in said block (I) ranges from 0.01 to 20% by weight with respect to the weight of said polyurethane block copolymer.

2. The polyurethane block copolymer according to claim 1 , wherein said alkenyl group-containing organopolysiloxane structure is derived from an alkenyl group-containing diorganopolysiloxane of which both terminals of a molecular chain are capped with hydroxyl groups.

3. The polyurethane block copolymer according to claim 2 , wherein the hydroxyl groups present at both terminals of said alkenyl group-containing diorganopolysiloxane are silicon atom-bonding hydroxyl groups or hydroxyl groups of silicon atom-bonding carbinol groups.

4. The polyurethane block copolymer according to claim 1 , wherein an amount of the alkenyl groups in said alkenyl group-containing organopolysiloxane structure ranges from 1 to 56% by weight.

5. An ink binder comprising the polyurethane block copolymer as recited in claim 1 .

6. An ink composition comprising the ink binder as recited in claim 5 , a coloring agent, and an organic solvent.

7. A process for manufacturing a composite molded body comprising the steps of supplying a curable silicone composition on the surface of a film formed using the ink composition as recited in claim 6 .

8. The ink binder according to claim 5 , wherein said polyurethane block copolymer has an amino group in a molecule, and an amine value of said polyurethane block copolymer with respect to 1 g of said polyurethane block copolymer ranges from 0.2 to 20 KOH mg.

9. A master batch comprising the polyurethane block copolymer as recited in claim 1 .

10. A thermoplastic polymer composition for molding comprising the polyurethane block copolymer as recited in claim 1 , and a thermoplastic polymer other than said polyurethane block copolymer.

11. The thermoplastic polymer composition for molding according to claim 10 , wherein said other thermoplastic polymer is a polar polymer.

12. The thermoplastic polymer composition for molding as recited in claim 10 , wherein said polyurethane block copolymer has said alkenyl group-containing organopolysiloxane structure in an amount ranging from 0.02 to 3% by weight with respect to weight of said thermoplastic polymer composition for molding.

13. A molded body having a member containing the thermoplastic polymer composition for molding as recited in claim 10 .

14. A thermoplastic polymer composition for molding comprising the polyurethane block copolymer as recited in claim 1 and a thermoplastic polymer other than said polyurethane block copolymer, wherein said other thermoplastic polymer is a non-polar polymer.

15. A molded body having a member containing the polyurethane block copolymer as recited in claim 1 .

16. The molded body according to claim 15 , which is a film or sheet.

17. A composite molded body comprising the molded body as recited in claim 15 and a member containing a silicone, wherein said member containing a silicone contacts a member containing said polyurethane block copolymer of said molded body.

18. A process for manufacturing a composite molded body comprising the steps of supplying a curable silicone composition on the surface of a member formed using the polyurethane block copolymer as recited in claim 1 .

19. A process for manufacturing a polyurethane block copolymer comprising reacting a polymer polyol and an organic polyisocyanate, and optionally a chain extender in the presence of (II') a functional group-containing block copolymer by means of a catalyst for a urethane-forming reaction, wherein said functional group-containing block copolymer (II') is a block copolymer having (A) a polymer block containing an aromatic vinyl compound unit and (B) a polymer block containing a conjugated diene unit, or a hydrogen additive of said block copolymer, and is a block copolymer having a functional group reactable with the polymer polyol and/or the organic polyisocyanate, and wherein as at least one part of said polymer polyol and/or chain extender, an alkenyl group-containing diorganopolysiloxane of which both terminals of a molecular chain are capped with hydroxyl groups is used in an amount ranging from 0.01 to 20% by weight with respect to the weight of the obtained polyurethane block copolymer.

20. The process for manufacturing the polyurethane block copolymer according to claim 19 , wherein said catalyst for a urethane-forming reaction is at least one compound selected from the group consisting of organic zinc-based compounds, organic bismuth-based compounds, organic titanium-based compounds and organic zirconium-based compounds.

21. An ink binder comprising a polyurethane comprising polyol units and organic polyisocyanate units, wherein said polyol units contain a polyol unit having an alkenyl group-containing organopolysiloxane structure and a ration of said alkenyl group-containing organopolysiloxane structure ranges from 0.01 to 20% by weight with respect to a weight of said polyurethane, wherein said polyurethane has an amino group in a molecule, and an amine value of said polyurethane with respect to 1 g of said polyurethane ranges from 0.2 to 20 KOH mg.

22. An ink composition comprising the ink binder as recited in claim 21 , a coloring agent, and an organic solvent.

23. A process for manufacturing a composite molded body comprising the steps of supplying a curable silicone composition on the surface of a film formed using the ink composition as recited in claim 22 .