Functional particle and preparing/plasma-treating method of the same
AssigneeReika Kogyo Kabushiki Kaisha
InventorsShin-ichi Nakao, Takeo Yamaguchi, Liang-Yin Chu, Sang-Hoon Park
Life of this patent
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Abstract
At least one of a hollow particle 14, a porous particle 24, and a solid particle 34 having the pores 18, 28, 38 on the surface thereof is subjected to plasma irradiation under a reduced pressure while changing plasma irradiation intensity and/or the degree of vacuum. After the plasma irradiation, at least one type of monomer is graft polymerized onto the surface of the plasma irradiated particle by contact between the at least one type of monomer and the particle so as to substantially fill the pores 18, 28, and 38 of the particle with grafted polymers 12 of the monomers.
Claims13
A functional particle preparing method comprising steps of:
- treating either one of a hollow particle or a porous particle having a pore on the surface thereof by plasma irradiation under a pressure of 10−2–10 mbar (1–103 Pa),
- graft polymerizing at least one type of monomer onto the surface of the plasma irradiated particle by contacting the at least one type of monomer with the surface of the plasma irradiated particle so as to substantially fill the pore of said particle with grafted polymers of said monomer;
- soaking said graft polymerized particle in a solution having an inclusion to be inserted into said graft polymerized particle, where the solution having the inclusion is adjusted such that the grafted polymers shrink to form openings that allow said inclusion to pass into said pore or through said pore into a cavity region within said particle;
- adjusting the solution having the inclusion such that the grafted polymers expand to close said openings and to prevent said inclusion from passing through said pore such that a functional particle having inclusion impregnated therein is obtained;
- and
- separating said functional particle from said solution;
- wherein
- during said plasma irradiation, plasma intensity and/or degree of vacuum are controlled;
- and
- during said contacting the at least one type of monomer with the surface of the plasma irradiated particle, at least one of the requirements for monomer concentration, graft polymerization temperature, and graft polymerization time is adjusted to control graft polymerization yield of said grafted polymers.
A functional particle obtained by a process comprising:
- treating either one of a hollow particle or a porous particle having a pore on the surface thereof by plasma irradiation,
- graft polymerizing at least one type of monomer onto the surface of the plasma irradiated particle by contacting the at least one type of monomer with the surface of the plasma irradiated particle so as to substantially fill the pore of said particle with grafted polymers of said monomer;
- and
- impregnating said pore and/or a cavity region of said particle with an inclusion;
- wherein
- during said plasma irradiation, a pressure of 10−2–10 mbar (1–103 Pa), plasma intensity and/or degree of vacuum are controlled, and
- during said contacting the at least one type of monomer with the surface of the plasma irradiated particle, at least one of the requirements for monomer concentration, graft polymerization temperature, and graft polymerization time is adjusted to control graft polymerization yield of said grafted polymers, and
- impregnating said pore and/or a cavity region of said particle comprises:
- soaking said graft polymerized particle in a solution having an inclusion to be inserted into said graft polymerized particle, where the solution having the inclusion is adjusted such that the grafted polymers shrink to form openings that allow said inclusion to pass into said pore or through said pore into a cavity region within said particle;
- and
- adjusting the solution having the inclusion such that the grafted polymers expand to close said openings and to prevent said inclusion from passing through said pore such that a functional particle having inclusion impregnated therein is obtained.
Dependencies are inferred from the claim text.