HYDROPHILIC POLYURETHANE DISPERSIONS

• US 20110021696A1
• Filed: 03/16/2009
• Published: 01/27/2011
• Est. Priority Date: 03/20/2008
• Status: Abandoned Application

• Current Assignee: Bayer Materialscience AG (Covestro AG)
• Original Assignee: Bayer Materialscience AG (Covestro AG)
• Inventors: Köcher, Jürgen, Rische, Thorsten
• Application Number:
  US12/933,149
• Publication Number:
  US 20110021696A1
• Time in Patent Office: Days
• US Class Current: 524/591
• CPC Class Codes: A61L 29/08 Materials for coatings
• CPC Class Codes: A61L 31/10 Macromolecular materials
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/283 Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/44 Polycarbonates
• CPC Class Codes: C08G 18/722 Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• CPC Class Codes: C08G 18/758 containing two or more cycloaliphatic rings
• CPC Class Codes: C09D 175/04 Polyurethanes

Abstract

The present invention relates to a polyurethane urea dispersion, wherein the polyurethane urea (1) is terminated with a copolymer unit of polyethylene oxide and polypropylene oxide, and (2) at least one polycarbonate polyol comprising at least one hydroxyl group.

Claims

1-7. -7. (canceled)

8. A coating composition in the form of a dispersion, wherein the coating composition comprises a polyurethaneurea, and wherein the poyurethaneurea

(1) is terminated with a copolymer unit comprising polyethylene oxide and polypropylene oxide, and

(2) comprises at least one hydroxyl-containing polycarbonate polyol.

9. The coating composition according to claim 8, wherein the polyurethaneurea comprises units which originate from at least one aliphatic, cycloaliphatic or aromatic isocyanate.

10. The coating composition according to claim 8, wherein the polyurethaneurea has a maximum ionic modification of 2.5% by weight.

11. The coating composition according to claim 8, wherein, the coating composition comprises a polyurethaneurea obtained from

a) at least one polycarbonate polyol having an average molar weight between 400 g/mol and 6000 g/mol and a hydroxyl functionality of 1.7 to 2.3, or mixtures of such polycarbonate polyols;

b) at least one aliphatic, cycloaliphatic or aromatic polyisocyanate or mixtures of such polyisocyanates in an amount per mole of the polycarbonate polyol of 1.0 to 4.0 mol;

c) at least one monofunctional mixed polyoxyalkylene ether comprising polyethylene oxide and polypropylene oxide or a mixture of such polyethers, having an average molar weight between 500 g/mol and 5000 g/mol, in an amount per mole of the polycarbonate polyol of 0.01 to 0.5 mol;

d) at least one aliphatic or cycloaliphatic diamine or at least one amino alcohol, as so-called chain extenders, or mixtures of such compounds in an amount per mole of the polycarbonate polyol of 0.05 to 3.0 mol;

e) optionally, one or more short-chain aliphatic polyols having a molar weight between 62 g/mol and 500 g/mol, in an amount per mole of the polycarbonate polyol of 0.1 to 1.0 mol; and

optionally, amine- or OH-containing units which are located on, and cap, the polymer chain ends.

12. A process for preparing the polyurethaneurea dispersion according to claim 8, comprising the steps of:

a) initially introducing the constituents (a), (b), (c) and optionally, (e) and optionally, diluting this initial charge with a water-miscible solvent which is inert towards isocyanate groups;

b) heating the composition obtainable from (1) to temperatures in the range from 50 to 120°

C.;

c) metering in any constituents of (c) and optionally (e) if present, not added at the beginning of the reaction;

d) dissolving the resulting prepolymer by means of aliphatic ketones;

e) adding constituent (d) for chain extension;

f) adding water for dispersing; and

g) removing the aliphatic ketone.

13. A process for preparing the polyurethaneurea dispersion according to claim 12, wherein the aliphatic ketone is removed by distillation.

14. A coating composition in the form of a dispersion, obtained by the process according to claim 12.

15. A coated medical device which comprises a medical device coated with the coating composition according to claim 8.

16. A process to coat a medical device which comprises coating the medical device with the coating composition according to claim 8.