Hydrophilic silicone elastomers

• US 7,452,957 B2
• Filed: 08/31/2005
• Issued: 11/18/2008
• Est. Priority Date: 08/31/2005
• Status: Expired due to Fees

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Inventors: Sayre, Curtis
• Primary Examiner(s): Gulakowski; Randy
• Assistant Examiner(s): LOEWE, ROBERT S
• Application Number:
  US11/217,093
• Publication Number:
  US 20070049716A1
• Time in Patent Office: 1,175 Days
• Field of Search: 528/26, 528/42, 525/100, 428/15, 428/848.8, 428/295, 438/708
• US Class Current: 528/26
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: C08F 283/12 on to polysiloxanes
• CPC Class Codes: C08G 77/045 containing less than 25 silicon atoms
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08L 2666/34 Oxygen-containing compounds, including ammonium and metal salts
• 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 83/04 Polysiloxanes
• 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
• CPC Class Codes: G03F 7/0002 Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping

Abstract

A silicone elastomer having hydrophilic properties is provided. The elastomer is a copolymer that is formed from a crosslinkable silicone composition, the silicone composition comprising an organopolysiloxane component and an ethylenically unsaturated monomer component. For example, the silicone composition may comprise:

• • i) an organopolysiloxane having the following general formula:

• • • wherein,
    • each R₂ is individually selected from unsubstituted and substituted monovalent hydrocarbon groups containing from 1 to 20 carbon atoms;
    • each R₃ is individually selected from unsubstituted and substituted alkenyl groups containing from 1 to 20 carbon atoms;
    • x≧1; and
    • y≧0 and is an integer that is selected so that the organopolysiloxane contains an average of at least two alkenyl groups per molecule;
  • ii) an ethylenically unsaturated carboxylic acid;
  • iii) a silicon hydride crosslinking agent; and
  • iv) a platinum-based catalyst.

Claims

1. A photolithographically-produced master comprising an elastomer applied to a support, wherein the elastomer has hydrophilic properties and comprises a crosslinked organopolysiloxane backbone copolymer formed from a silicone composition, the silicone composition comprising an organopolysiloxane component and acrylic acid, wherein the acrylic acid is incorporated into the crosslinked organopolysiloxane backbone copolymer to form the crosslinked copolymer, wherein the silicone composition has been subjected to an extraction process after crosslinking.

2. The photolithographically-produced master of claim 1, wherein the organopolysiloxane component comprises an organopolysiloxane having the following general formula:

3. The photolithographically-produced master of claim 2, wherein the organopolysiloxane contains two or more alkenyl groups.

4. The photolithographically-produced master of claim 3, wherein the organopolysiloxane has the following general formula:

5. The photolithographically-produced master of claim 4, wherein the organopolysiloxane has the following general formula:

6. The photolithographically-produced master of claim 1, wherein the organopolysiloxane component comprises from about 50 weight % of the silicone composition.

7. The photolithographically-produced master of claim 1, wherein the acrylic acid comprises from about 0.5 to about 10 weight % of the silicone composition.

8. The photolithographically-produced master of claim 1, wherein the acrylic acid comprises from about 2 to about 6 weight % of the silicone composition.

9. The photolithographically-produced master of claim 1, wherein the silicone composition further comprises a crosslinking agent.

10. The photolithographically-produced master of claim 9, wherein the crosslinking agent is a silicon hydride capable of undergoing a hydrosilation reaction with the organopolysiloxane component.

11. The photolithographically-produced master of claim 10, wherein the silicone hydride crosslinking agent has the following general formula:

12. The photolithographically-produced master of claim 10, wherein the silicone composition further comprises a hydrosilation catalyst.

13. The photolithographically-produced master of claim 12, wherein the catalyst contains a Group VIII transition metal.

14. The photolithographically-produced master of claim 13, wherein the transition metal is platinum.

15. The photolithographically-produced master of claim 14, wherein the catalyst is a platinum-vinylsiloxane complex.

16. The photolithopraphically-produced master of claim 15, wherein the catalyst is Pt(0)-1 ,3-divinyl-1 ,1 ,3,3-tetramethyldisiloxane.

17. The photolithographically-produced master of claim 12, wherein the catalyst is dispersed in an organic solvent selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, and ethers.

18. The elastomer of claim 1, wherein photolithographically-produced master forms a microcontact printing stamp.

19. A photolithographically-produced master comprising an elastomer applied to a support, wherein the elastomer is formed by curing a silicone composition to form an crosslinked organopolysiloxane backbone copolymer, wherein the silicone composition has been subjected to an extraction process after being cured, the crosslinked organopolysiloxane backbone copolymer comprising:

i) an organopolysiloxane component that comprises an organopolysiloxane having the following general formula;

20. The photolithographically-produced master of claim 19, wherein the organopolysiloxane has the following general formula:

21. The photolithographically-produced master of claim 19, wherein the organopolysiloxane component comprises from about 20 wt.% to about 50 weight % of the silicone composition.

22. The photolithographically-produced master of claim 19, wherein the acrylic acid comprises from about 0.5 to about 10 weight % of the silicone composition.

23. The photolithographically-produced master of claim 19, wherein the acrylic acid comprises from about 2 to about 6 weight % of the silicone composition.

24. The photolithographically-produced master of claim 19, wherein the silicone hydride crosslinking agent has the following general formula:

25. The photolithographically-produced master of claim 19, wherein the catalyst is a platinum-vinylsiloxane complex.

26. The photolithographically-produced master of claim 25, wherein the catalyst is Pt(0)-1 ,3-divinyl-1 ,1 ,3,3-tetramethyldiloxane.

27. The photolithographically-produced master of claim 19, wherein the catalyst is dispersed in an organic solvent selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, and ethers.

28. The photolithographically-produced master of claim 19, wherein curing occurs at a temperature of from about 20°

C. to about 30°

C.

29. The photolithographically-produced master of claim 19, wherein the support consists of a silicon wafer, glass, or polymeric material.

30. The photolithographically-produced master of claim 19, wherein the elastomer is casted onto a master to form a microcontact printing stamp.

31. The mircrocontact printing stamp of claim 30, wherein the stamp is used to print biological molecules onto a surface for use in a biosensor.

32. The biosensor of claim 31, wherein the biosensor is used in optical sensing devices.