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Submicron-size composite polymer particles consisting of polydimethylsiloxane/core and polybutadiene/shell were synthesized by seeded emulsion polymerization. The morphologies of composite particles were affected by polybutadiene ratio in the composite particles. Highly grafted polymer by poly(styrene- co-acrylonitrile) could be prepared by using the composite particles containing polybutadiene with polymerizable group. The morphologies of the grafted polymer were influenced by the morphologies of composite particles and the kinds of grafting initiators. It was found that surface gloss and lubricity of the graft polymers were influenced by morphologies of composite particles. [ABSTRACT FROM AUTHOR]