Polyolefin Grafted Polydiene Polymers, And Methods Of Making And Using Same
Embodiments of the present disclosure are directed to polyolefm grafted polydiene polymers, wherein the polyolefin grafted polydiene polymers comprises a polydiene having a polydiene polymer backbone, a polyolefm, and at least one sulfur containing functionalizing agent which grafts the polyolefin onto at least one non-terminal position on the polydiene polymer backbone.
1 . A polyolefin grafted polydiene polymer comprising:
a polydiene having a polydiene polymer backbone;
a polyolefin; and
at least one sulfur containing functionalizing agent which grafts the polyolefin onto at least one non-terminal position on the polydiene polymer backbone.
2 . The polyolefin grafted polydiene polymer of claim 1 wherein the polyolefin comprises an anhydride polymeric modifier.
3 . The polyolefin grafted polydiene polymer of claim 2 , wherein the anhydride polymeric modifier comprises maleic anhydride.
4 . The polyolefin grafted polydiene polymer of claim 2 , wherein the sulfur containing functionalizing agent comprises an aminothiol, the aminothiol having an amine moiety which reacts with the anhydride polymeric modifier.
5 . The polyolefin grafted polydiene polymer of claim 1 , wherein the polyolefin comprises one or more C 2 -C 12 olefins.
6 . The polyolefin grafted polydiene polymer of claim 1 , wherein the polydiene comprises 1,4-polybutadiene having a cis % of at least 85%.
7 . A rubber composition comprising:
one or more rubbers selected from natural rubber and polydiene rubber;
reinforcing filler; and
the polyolefin grafted polydiene polymer of claim 1 .
8 . The rubber composition of claim 7 wherein a volume fraction of reinforcing filler plus polyolefin in the rubber composition is about 0.200 to about 0.350.
9 . The rubber composition of claim 7 wherein the rubber composition has a loss modulus G″≤0.1 MPa and a tan δ≤0.075.
10 . A method of producing a polyolefin grafted polydiene polymer comprising:
reacting a polyolefin with at least one sulfur containing functionalizing agent to produce a functionalized polyolefin; and
producing the polyolefin grafted polydiene polymer by reacting the functionalized polyolefin with an unsaturated polydiene polymer.
11 . The method of claim 10 , wherein the unsaturated polydiene polymer comprises 1,4-polybutadiene having a cis % of at least 85%.
12 . The method of claim 10 , wherein the polyolefin comprises a polyolefin polymer backbone with a polymeric modifier attached thereto, wherein the polymeric modifier reacts with the sulfur containing functionalizing agent.
13 . The method of claim 12 , wherein the polymeric modifier is maleic anhydride, and the sulfur containing functionalizing agent includes thiols, polysulfides, or combinations thereof.
14 . The method of claim 10 , wherein the functionalized polyolefin is grafted onto at least one non-terminal position on the unsaturated polydiene polymer.
15 . The method of claim 10 , wherein the polyolefin is a copolymer, wherein the copolymer includes an ethylene monomer and at least one C 3 -C 12 olefin comonomer.