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Silicone compositions comprising a swollen silicone gel

  • US 9,243,113 B2
  • Filed: 10/19/2010
  • Issued: 01/26/2016
  • Est. Priority Date: 10/23/2009
  • Status: Active Grant
First Claim
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1. A method for the preparation of a silicone composition, the method comprising:

  • combiningComponent (A), at least one organopolysiloxane having an average of at least two free radical polymerizable groups per molecule, the organopolysiloxane having the structure;


    R13SiO(R12SiO)a(R1R2SiO)bSiR13 or R32R4SiO(R32SiO)c(R3R4SiO)dSiR32R4,whereinat each occurrence R1 and R3 are independently chosen from halogen and a monovalent organic group,at each occurrence R2 and R4 are independently a monovalent unsaturated organic group,a, c, and d are independently about 0 to about 20,000, and b is about 1 to about 20,000,Component (B), at least one organoborane free radical initiator, andComponent (C), at least one fluid miscible with Component (A), to form a reaction mixture, wherein Component (B) is the only catalyst present in the reaction mixture; and

    gelling the reaction mixture to form a substantially homogeneous swollen silicone gel, the gelling comprisingpolymerizing Component (A) in the presence of Component (B), Component (C), and oxygen, while maintaining a temperature of from about 5°

    C. to about 95°

    C., to form the substantially homogeneous swollen silicone gel, wherein about 50 wt % to about 90 wt % of the substantially homogeneously swollen silicone gel is Component (C).

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