Cyclic organo carbonate and sulfite coupling agents for living polymers of conjugated dienes
AssigneeThe Goodyear Tire & Rubber Company
InventorsJoginder Lal, Michael L. Senyek
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Abstract
New compositions and a process for the preparation of conjugated diene polymers of broadened molecular weight distribution by reacting non-terminated lithium catalyzed conjugated diene polymers with cyclic organic compounds selected from the group of carbonates, thiocarbonates and sulfites. The resulting new compositions are suitable for use in making high impact plastics and for fabricating rubber goods.
Claims9
A process for the preparation of conjugated diene polymers of broadened molecular weight distribution and negligible cold flow comprising:
- (a) polymerizing at least one conjugated diene in the presence of an initiator selected from organoalkali metal or organomagnesium initiators until the consumption of monomer is substantially complete,
- (b) reacting the resulting polymer from said step (a) by ring-opening coupling with a compound of the general formula:
- ##STR15## wherein, Z is a 1,2-phenylene, 1,2-cyclohexylene, or ##STR16## grouping wherein n=0 or 1 and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are the same or different and are selected from hydrogen or a hydrocarbyl group containing from 1 to 12 carbon atoms and A, B and Y are oxygen or sulfur and X is carbon or sulfur, with the stipulation that when X is sulfur, Y must be oxygen, in an amount of from 0.2 to 3 moles of the coupling compound per mole of said organoalkali metal or organomagnesium initiator.
Conjugated diene polymers of broadened molecular weight distribution and negligible cold flow prepared by:
- (a) polymerizing at least one conjugated diene in the presence of an initiator selected from organoalkali metal or organomagnesium initiators until the consumption of monomer is substantially complete,
- (b) reacting the resulting polymer from said step (a) by ring-opening coupling with a compound of the general formula:
- ##STR17## wherein, Z is a 1,2-phenylene, 1,2-cyclohexylene, or ##STR18## grouping wherein n=0 or 1 and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are the same or different and are selected from hydrogen or a hydrocarbyl group containing from 1 to 12 carbon atoms and A, B and Y are oxygen or sulfur and X is carbon or sulfur, with the stipulation that when X is sulfur, Y must be oxygen, in an amount of from 0.2 to 3 moles of the coupling compound per mole of said organoalkali metal or organomagnesium initiator.
Dependencies are inferred from the claim text.