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US 2007/0185273 A1Published application
Polymeric Nano-Particles Of Flower-Like Structure And Applications
AssigneeBridgestone Corporation
InventorsXiaorong Wang, Yoichi Ozawa, James Hall
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Abstract
A flower-like nano-particle composition including a poly (alkenylbenzene) core and a poly (conjugated diene) or a poly(alkylene) surface layer is provided. The nano-particles have a mean average diameter less than about 100 nm and are substantially free of chain ends. The nano-particles can be modified via, for example, hydrogenation. The nano-particles can advantageously be incorporated into rubbers, elastomers, and thermoplastics.
Claims26
A nano-particle comprising:
- a. a cross-linked poly(alkenylbenzene) core, and
- b. a polymeric surface layer comprising contributed monomer units selected from the group consisting of conjugated diene, alkylene, alkenylbenzene, and mixtures thereof,
- wherein said poly(alkenylbenzene) core comprises all ends of at least ten polymer chains used to form said nanoparticle, and said nanoparticle has a mean average diameter of less than about 100 nm.
A nano-particle comprising:
- a. a cross-linked poly(alkenylbenzene) core, and
- b. a polymeric surface layer comprising contributed monomer units selected from the group consisting of conjugated diene, alkylene, alkenylbenzene, and mixtures thereof,
- wherein said poly(alkenylbenzene) core comprises all ends of at least ten triblock polymer chains comprising poly(alkenylbenzene) ends, said triblock polymer chains are polymerized by using at least one divalent anionic initiator, and said nanoparticle has a mean average diameter of less than about 100 nm.
A method comprising:
- a. initiating polymerization of at least one conjugated diene in a hydrocarbon solvent with at least one divalent anionic initiator to form a poly(conjugated diene) having two living ends;
- b. adding alkenylbenzene monomer to the product of step (a) to form triblock polymer chains having two living alkenylbenzene chain ends;
- c. forming micelles comprising said triblock polymers, wherein the interior of said micelles comprise said two living alkenylbenzene chain ends;
- d. adding at least one cross-linking agent to the product of step (c) to cross-link the interior of said micelles to form nano-particles having a mean average diameter of less than about 100 nm.
1 more element
Dependencies are inferred from the claim text.