Soluble polysilastyrene and method for preparation

• US 4,324,901 A
• Filed: 04/29/1981
• Issued: 04/13/1982
• Est. Priority Date: 04/29/1981
• Status: Expired due to Fees

• Current Assignee: Wisconsin Alumni Research Foundation (University of Wisconsin System)
• Original Assignee: Wisconsin Alumni Research Foundation (University of Wisconsin System)
• Inventors: West, Robert C., David, Lawrence D.
• Primary Examiner(s): Shaver, Paul F.
• Application Number:
  US06/258,663
• Time in Patent Office: 349 Days
• Field of Search: 556/430
• US Class Current: 556/430
• CPC Class Codes: C07F 7/0803 Compounds with Si-C or Si-Si linkages
• CPC Class Codes: C08G 77/60 in which all the silicon atoms are connected by linkages other than oxygen atoms

Abstract

The preparation of soluble polysilastyrene comprising reacting phenylmethyldichlorosilane and dimethyldichlorosilane in the mole ratio of 1 to 0.25-2 in the solvent solution in the presence of sodium.

Claims

1. Process for making polysilastyrenes comprising reacting phenylmethyldichlorosilane and dimethyldichlorosilane in solvent solution in the presence of sodium in the ratio of 1 mole phenylmethyldichlorosilane to 0.25-2 moles dimethyldichlorosilane.

2. The process as claimed in claim 1 in which the monomers are reacted in about equal molecular proportions.

3. The process as claimed in claim 1 in which the reaction is carried out at a temperature above the melting point temperature of the sodium.

4. The process as claimed in claim 1 in which the reaction is carried out at a temperature within the range of 100°

-150°

C.

5. The process as claimed in claim 1 in which the solvent is a non-acidic solvent having a boiling point of at least 100°

C. and is inert to the sodium and to the chlorosilanes.

6. The process as claimed in claim 1 in which the reaction is carried out at reflux temperature.

7. The process as claimed in claim 1 in which the sodium is employed at a slight excess of up to 20 mole percent.

8. The process as claimed in claim 1 which includes potassium in an amount up to 1% by weight of the sodium.

9. The process as claimed in claim 1 which includes the step of protecting the reaction from light.

10. The process as claimed in claim 1 in which the reaction is carried out in an inert atmosphere.

11. A polysilastyrene produced by the process of claim 1 having the general formula ##STR3## in which x equals 0.6-1.4 and n is a number up to 1200.