Synthesis of low viscosity non-functional terminated polymers
AssigneeThe B. F. Goodrich Company
InventorRobert J. Bertsch
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Abstract
A non-functional liquid rubber is prepared by the solution polymerization of vinyl monomers. The polymer may be a homopolymer or a copolymer. As a copolymer the preferred monomers are a conjugated diene and a vinyl substituted nitrile such as acrylonitrile or methacrylonitrile. A non-functional initiator is employed that is either an azo initiator or a peroxide initiator.
Claims6
A low viscosity liquid polymer product having improved clarity and reduced odor having a copolymer backbone comprising from about 50 percent to about 99 percent by weight based on the total weight of the copolymer backbone of a diene monomer, and up to about 50 percent by weight of a vinyl nitrile comonomer or a vinyl aromatic comonomer, said copolymer backbone being derived by free radical solution polymerization utilizing an initiator which provides a non-functional initiator fragment, said initiator being a bis-azocyano initiator having the formula ##STR8## wherein R.sup.7 is an alkyl group of 1 to 3 carbon atoms and n is an integer of from 0 to about 6, the initiator being added to said free radical solution polymerization in a mole ratio of initiator to monomers of from about 1.5:50 to about 2.0:15, whereby said copolymer backbone is provided with a non-functional terminus derived from said initiator fragments which undergoes substantially non condensation reaction or addition reaction and further whereby said rubbery polymer has a number average molecular weight of from about 1,500 to about 20,000.
Dependencies are inferred from the claim text.