Transparent polycarbonate-polysiloxane copolymer blend, method for the preparation thereof, and article derived therefrom

• US 7,135,538 B2
• Filed: 09/24/2004
• Issued: 11/14/2006
• Est. Priority Date: 11/12/2003
• Status: Active Grant

• Current Assignee: SHPP Global Technologies BV
• Original Assignee: General Electric Company
• Inventors: Pixton, Matthew Robert, Glasgow, Katherine, Dhara, Dibakar, Kumar, Vikram, Zerda, Adam
• Primary Examiner(s): BOYKIN, TERRESSA M
• Application Number:
  US10/950,100
• Publication Number:
  US 20050101757A1
• Time in Patent Office: 781 Days
• Field of Search: 524/155, 524/164, 524/394, 528/196, 528/198
• US Class Current: 528/196
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/10 Block- or graft-copolymers containing polysiloxane sequences obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00

Abstract

A composition includes a polycarbonate-polysiloxane block copolymer that has at least one polycarbonate block and at least one polysiloxane block, and a surface modifying agent that includes at least one polysiloxane segment. Increased levels of the surface modifying agent can be incorporated without compromising high transmittance and low haze. The compositions also exhibit improved hemocompatibility and are therefore useful for a variety of articles that may contact blood.

Claims

1. A composition, comprising a blend of:

a polycarbonate-polysiloxane block copolymer comprising at least one polycarbonate block and at least one polysiloxane block;

wherein the polycarbonate block comprises repeating units having the structure

2. The composition of claim 1, wherein the polycarbonate-polysiloxane block copolymer consists essentially of the polycarbonate blocks and the polysiloxane blocks.

3. The composition of claim 1, wherein R¹ has the structure

-A¹-Y¹-A²-

wherein each of A¹ and A² is a monocyclic divalent aryl radical;

and wherein Y¹ is selected from be —

O—

, —

S—

, —

S(O)—

, —

S(O)₂—

, —

C(O)—

, and C₁–

C₁₈ hydrocarbylene.

4. The composition of claim 1, wherein the substituted or unsubstituted divalent aromatic organic radicals comprise the residuum of 2,2-bis(4-hydroxyphenyl)propane.

5. The composition of claim 1, wherein each occurrence of R² is methyl.

6. The composition of claim 1, wherein the polysiloxane block has the structure

7. The composition of claim 6, wherein D is about 5 to about 75.

8. The composition of claim 6, wherein D is about 10 to about 60.

9. The composition of claim 6, wherein each occurrence of x is 0, and each occurrence of R³ independently has the structure

10. The composition of claim 1, wherein the polycarbonate-polysiloxane block copolymer comprises about 70 to about 99 weight percent of the polycarbonate blocks.

11. The composition of claim 1, wherein the polycarbonate-polysiloxane block copolymer comprises about 1 to about 30 weight percent of the polysiloxane blocks.

12. The composition of claim 1, wherein the composition comprises about 0.1 to about 30 weight percent of total polysiloxane blocks.

13. The composition of claim 1, comprising about 1 to about 99.9 weight percent of the polycarbonate-polysiloxane block copolymer.

14. The composition of claim 1, wherein the surface modifying agent comprises a polyester-polysiloxane block copolymer.

15. The composition of claim 1, wherein the surface modifying agent comprises a polycaprolactone-polydimethylsiloxane-polycaprolactone triblock copolymer.

16. The composition of claim 1, comprising about 0.1 to about 50 weight percent of the surface modifying agent.

17. The composition of claim 1, further comprising a polymer selected from polycarbonates, polyestercarbonates, polyesters, polyarylates, and mixtures thereof.

18. The composition of claim 1, further comprising an impact modifier.

19. The composition of claim 1, further comprising an additive selected from fillers, reinforcing agents, thermal stabilizers, antioxidants, light stabilizers, gamma-irradiation stabilizers, plasticizers, colorants, extenders, antistatic agents, catalyst quenchers, lubricants, mold releasing agents, processing agents, blowing agents, flame retardants, anti-drip agents, and mixtures thereof.

20. The composition of claim 1, having a percent transmission of at least 70% measured according to ASTM D1003 at a thickness of 3.2 millimeters.

21. The composition of claim 1, having a percent haze of less than or equal to 10% measured according to ASTM D1003 at a thickness of 3.2 millimeters.

22. The composition of claim 1, having a notched Izod impact strength of at about 500 to about 1,000 joules per meter, measured according to ASTM D256 at 23°

C.

23. The composition of claim 1, wherein human blood exposed to the composition for 30 minutes at 35°

C. has a platelet retention percent, measured according to the procedure of Examples 10 and 11, that is at least 5 percent higher than the platelet retention percent of blood exposed to a composition consisting of a bisphenol A polycarbonate homopolymer having a weight average molecular weight of about 20,000 to about 30,000 atomic mass units.

29. An article comprising the composition of claim 1.

30. The article of claim 29 comprising a film, sheet, molded object, membrane, or composite.

31. The article of claim 30 wherein the film, sheet, molded object or composite has at least one layer comprising the composition.

24. A composition, comprising:

a polycarbonate-polysiloxane block copolymer comprising at least one polycarbonate block and at least one polysiloxane block;

wherein the polycarbonate block comprises repeating units having the structure

25. The composition according to claim 24, comprising:

about 5 to about 99 weight percent of a polycarbonate-polysiloxane block copolymer comprising at least one polycarbonate block and at least one polysiloxane block;

wherein the polycarbonate block comprises repeating units having the structure

26. The composition according to claim 25, comprising:

about 10 to about 25 weight percent of a polycarbonate-polysiloxane block copolymer comprising at least one polycarbonate block and at least one polysiloxane block;

wherein the polycarbonate block comprises repeating units having the structure

27. The composition according to claim 26, comprising:

about 15 to about 20 weight percent of a polycarbonate-polysiloxane block copolymer comprising at least one polycarbonate block and at least one polysiloxane block;

wherein the polycarbonate block comprises repeating units having the structure

32. An article comprising the composition of claim 24.

28. A method of preparing a thermoplastic composition, comprising:

blending a polycarbonate-polysiloxane block copolymer comprising at least one polycarbonate block and at least one polysiloxane block;

wherein the polycarbonate block comprises repeating units having the structure