Bulk polymerization of silicone-containing copolymers
OwnerAudrey A. Sherman, Mark F. Ellis +4inventors
InventorsAudrey A. Sherman, Mark F. Ellis, Ramesh C. Kumar, Sonja S. MacKey, Richard L. Peloquin, Jeffrey O. Emslander
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Abstract
Methods for preparing silicone-containing polymers by essentially adiabatic polymerization methods are disclosed. The polymerization system includes free radically polymerizable monomers. The monomers include ethylenically unsaturated cone-containing monomers and/or mercapto-functional silicones as well as additional free radically polymerizable monomers. The silicone-containing polymers are useful as adhesives or release materials.
Claims30
A method comprising:
- providing a first reaction mixture comprising:
- an ethylenically unsaturated silicone-containing monomer;
- at least one additional ethylenically unsaturated monomer;
- a chain transfer agent;
- and
- a thermal initiator;
- deoxygenating the first reaction mixture;
- heating the first reaction mixture to a temperature above the activation temperature of the thermal initiator;
- allowing the first reaction mixture to polymerize under essentially adiabatic conditions to yield an at least partially polymerized mixture;
- cooling the at least partially polymerized mixture;
- adding an additional thermal initiator, and a chain transfer agent to the partially polymerized mixture to form a second reaction mixture;
- deoxygenating the second reaction mixture;
- heating the second reaction mixture to a temperature above the activation temperature of the additional thermal initiator;
- allowing the second reaction mixture to polymerize under essentially adiabatic conditions to form a polymer.
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A method comprising:
- providing a first reaction mixture comprising:
- an mercapto-functional silicone;
- at least one ethylenically unsaturated monomer;
- and
- a thermal initiator;
- deoxygenating the first reaction mixture;
- heating the first reaction mixture to a temperature above the activation temperature of the thermal initiator;
- allowing the first reaction mixture to polymerize under essentially adiabatic conditions to yield an at least partially polymerized mixture;
- cooling the at least partially polymerized mixture;
- adding an additional thermal initiator to the partially polymerized mixture to form a second reaction mixture;
- deoxygenating the second reaction mixture;
- heating the second reaction mixture to a temperature above the activation temperature of the additional thermal initiator;
- allowing the second reaction mixture to polymerize under essentially adiabatic conditions to form a polymer.
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Dependencies are inferred from the claim text.