Silalkylenesiloxane copolymer materials and methods for their preparation

• US 6,080,829 A
• Filed: 06/24/1998
• Issued: 06/27/2000
• Est. Priority Date: 06/24/1998
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Tapsak, Mark A., Domenico, Edward Di
• Primary Examiner(s): Dawson, Robert
• Assistant Examiner(s): Robertson, Jeffrey B.
• Application Number:
  US09/103,879
• Time in Patent Office: 734 Days
• Field of Search: 556/434, 556/435, 528/35, 528/37, 528/14, 528/18, 528/12
• US Class Current: 528/35
• CPC Class Codes: C08G 77/485 containing less than 25 silicon atoms
• CPC Class Codes: C08G 77/50 by carbon linkages C08G77/485 takes precedence
• 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 83/14 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms C08L83/10 takes precedence

Abstract

Symmetric and asymmetric cyclic silalkylenesiloxane monomers and copolymers thereof are disclosed, as well as crosslinked and/or reinforced silalkylenesiloxane copolymers, medical devices containing such materials, and methods of preparation.

Claims

1. A symmetric cyclic silalkylenesiloxane monomer having the following formula:

##STR18## wherein p is at least 6, v is at least 1, and each R¹ and R² group is independently a monovalent organic group.

2. The cyclic silalkylenesiloxane monomer of claim 1 wherein each R¹ and R² group is independently a C₁ -C₄ alkyl group.

3. The cyclic silalkylenesiloxane monomer of claim 2 wherein each R¹ and R² group is a methyl moiety.

4. The cyclic silalkylenesiloxane monomer of claim 1 wherein p is 6 to 30.

5. The cyclic silalkylenesiloxane monomer of claim 1 wherein v is 1 to 3.

6. A symmetric cyclic silalkylenesiloxane monomer having the following formula:

##STR19## wherein p is at least 2, v is at least 2, and each R¹ and R² group is independently a monovalent organic group.

7. An asymmetric cyclic silalkylenesiloxane monomer having the following formula:

##STR20## wherein p and q are each at least 2, v and w are each at least 1, with the proviso that q does not equal p for at least one set of silalkylenesiloxane repeat units, and each R¹ and R² group is independently a monovalent organic group.

8. The asymmetric cyclic silalkylenesiloxane monomer of claim 7 wherein each R¹ and R² group is independently a C₁ -C₄ alkyl group.

9. The asymmetric cyclic silalkylenesiloxane monomer of claim 8 wherein each R¹ and R² group is a methyl moiety.

10. The asymmetric cyclic silalkylenesiloxane monomer of claim 7 wherein q is 2 to 30.

11. The asymmetric cyclic silalkylenesiloxane monomer of claim 7 wherein w is 1 to 3.

12. A silalkylenesiloxane copolymer of the formula:

##STR21## wherein p is at least 2, b is at least 1, the sum of b and c is greater than 1000, and each of R¹, R², R³, R⁴ and R⁵ is independently a monovalent organic group, wherein said copolymer is crosslinked.

13. A medical device comprising a silalkylenesiloxane copolymer of the formula:

##STR22## wherein p is at least 2, b is at least 1, c is zero or greater, the sum of b and c is greater than 1000, and each of R¹, R², R³, R⁴ and R⁵ is independently a monovalent organic group.

14. The medical device of claim 13 wherein the copolymer is crosslinked.

15. The medical device of claim 14 wherein the crosslinked copolymer is compounded with a silica filler.