Polyether-polysiloxane crosslinked rubber spherical particle, method for manufacturing the same, polyether-polysiloxane crosslinked composite particle, and method for manufacturing the same

1 . A polyether-polysiloxane crosslinked rubber spherical particle comprising an addition-reaction product of a composition comprising:

(A) a polyether having at least two aliphatic unsaturated groups in one molecule, the polyether being a polypropylene glycol having the aliphatic unsaturated groups in both terminal moieties in one molecule;

(B) an organohydrogenpolysiloxane shown by the following general formula (1),

wherein 0<l≤1000, 2≤m≤1000, 0≤n≤1000,

R 1 independently represents a hydrogen atom, a monovalent hydrocarbon group having 1 to 12 carbon atoms that is unsubstituted or is substituted with a halogen atom, or an alkoxy group, and R 2 independently represents a monovalent hydrocarbon group having 1 to 20 carbon atoms,

the organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule; and

(C) a hydrosilylation-reaction catalyst, and

wherein the component (B) is a phenylorganohydrogenpolysiloxane having a value of a solubility parameter Δ of at least 7.5, and satisfying the following inequality (3), the solubility parameter Δ being shown by the following equality (2):

Δ=ρΣ F/M   (2)

wherein “ρ” is a specific weight of the organohydrogenpolysiloxane, F is a molecular cohesive energy constant ((cal·cm 3 ) 1/2 /mol) of atoms and functional groups, and M is a molecular weight of the organohydrogenpolysiloxane,

( l/l+m+n+ 2)×100>10  (3);

excluding a combination where two of the aliphatic unsaturated groups are present in the component (A) in one molecule and two of the silicon-bonded hydrogen atoms are present in the component (B) in one molecule.

2 . A polyether-polysiloxane crosslinked composite particle comprising:

the polyether-polysiloxane crosslinked rubber spherical particle according to claim 1 ; and

a spherical polyorganosilsesquioxane or silica adhered to a surface of the polyether-polysiloxane crosslinked rubber spherical particle.

3 . A method for manufacturing the polyether-polysiloxane crosslinked rubber spherical particle according to claim 1 , comprising the steps of:

(i) obtaining an O/W type emulsion including an oil phase component containing the component (A) and the component (B) and an aqueous phase component;

(ii) curing the component (A) and the component (B) contained in the oil phase component in the O/W type emulsion obtained in the step (i) in the presence of the component (C) by an addition-curing reaction to obtain an aqueous dispersion of the polyether-polysiloxane crosslinked rubber spherical particle; and

(iii) removing water, being an external phase, and water present in the polyether-polysiloxane crosslinked rubber spherical particle from the aqueous dispersion of the polyether-polysiloxane crosslinked rubber spherical particle obtained in the step (ii).

4 . A method for manufacturing the polyether-polysiloxane crosslinked composite particle according to claim 2 , comprising the steps of:

(i) obtaining an O/W type emulsion including an oil phase component containing the component (A) and the component (B) and an aqueous phase component;

(ii) curing the component (A) and the component (B) contained in the oil phase component in the O/W type emulsion obtained in the step (i) in the presence of the component (C) by an addition-curing reaction to obtain an aqueous dispersion of the polyether-polysiloxane crosslinked rubber spherical particle; and

(iv) subjecting an organotrialkoxysilane or a tetraalkoxysilane to hydrolysis and polycondensation in the presence of the polyether-polysiloxane crosslinked rubber spherical particle obtained in the step (ii), water, and an alkaline substance to make a polyorganosilsesquioxane or silica adhere to the surface of the polyether-polysiloxane crosslinked rubber spherical particle.