Particulate and method for producing particulate
A powdery and/or granular material which achieves excellent dispersibility of fine polymer particles in a matrix resin is provided. The powdery and/or granular material contains specific fine polymer particles (A) and a specific resin (B), and has pores with an average pore diameter of 0.03 μm to 1.00 μm, where a total volume of the pores is not less than 0.0600 mL/g.
1 . A method for producing a powdery and/or granular material, said method comprising:
an agglutinating step of preparing an agglutinate containing fine polymer particles (A) and a resin (B); and
a drying step of airflow-drying or freeze-drying the agglutinate; wherein
the agglutinating step further includes a fine polymer particle spraying step of spraying an aqueous latex containing the fine polymer particles (A) and the resin (B) in a presence of a flocculant,
the fine polymer particles (A) contain a rubber-containing graft copolymer that includes an elastic body and a graft part grafted to the elastic body,
the elastic body contains diene-based rubbers,
the graft part contains a polymer that contains, as one or more structural units, the one or more structural units derived from at least one type of monomer selected from the group consisting of aromatic vinyl monomers, vinyl cyanide monomers, and (meth)acrylate monomers,
the resin (B) is a liquid which has a viscosity of 100 mPa's to 1,000,000 mPa's at 25° C., a semisolid, or a solid, and
an amount of the fine polymer particles (A) is 50% by weight to 99% by weight and an amount of the resin (B) is 1% by weight to 50% by weight, where 100% by weight represents a total amount of the fine polymer particles (A) and the resin (B).
2 . The method as set forth in claim 1 , wherein the agglutinating step further includes a flocculant spraying step of spraying the flocculant or a solution containing the flocculant in the presence of the fine polymer particles (A) and the resin (B).
3 . The method as set forth in claim 1 , wherein the drying step is carried out at a temperature of not higher than 100° C.
4 . A method for producing a powdery and/or granular material, said method comprising
a mixing step of mixing an aqueous latex (A) containing fine polymer particles (A) with an aqueous latex (B) containing a resin (B), and
a preparation step of preparing a powdery and/or granular material containing the fine polymer particles (A) and the resin (B) from a mixture solution obtained in the mixing step, wherein:
the mixing step further includes an aqueous latex (B) preparation step of preparing the aqueous latex (B) containing the resin (B), wherein in the aqueous latex (B) preparation step, 1.0 parts by weight to 30.0 parts by weight of an emulsifying agent is added with respect to 100 parts by weight of the resin (B), and a stirring speed in the aqueous latex (B) preparation step is 3000 rpm to 40000 rpm,
the fine polymer particles (A) contain a rubber-containing graft copolymer that includes an elastic body and a graft part grafted to the elastic body;
the elastic body contains diene-based rubbers;
the graft part contains a polymer that contains, as one or more structural units, the one or more structural units derived from at least one type of monomer selected from the group consisting of aromatic vinyl monomers, vinyl cyanide monomers, and (meth)acrylate monomers;
the resin (B) is a liquid which has a viscosity of 100 mPa's to 1,000,000 mPa's at 25° C., a semisolid, or a solid;
the powdery and/or granular material contains the fine polymer particles (A) in an amount of 50% by weight to 99% by weight and the resin (B) in an amount of 1% by weight to 50% by weight, with respect to 100% by weight in total of the fine polymer particles (A) and the resin (B); and
the mixture solution contains droplets having a volume-average particle size of not less than x−σ and not more than x+5σ in an amount of 0.0% by weight to 14.0% by weight, with respect to 100% by weight of the resin (B) in the mixture solution, where x (μm) is a volume-average particle size of droplets in the aqueous latex (B), and σ is a standard deviation of the volume-average particle size of droplets in the aqueous latex (B).
5 . The method as set forth in claim 1 , wherein a force required to break a block of the powdery and/or granular material is not more than 30000 Pa, where:
the block is a block obtained by applying, to the powdery and/or granular material which is being allowed to stand, a load of 6.3 kg at 60° C. for 2 hours by placing a 6.3 kg weight on 30 g of the powdery and/or granular material contained in a cylindrical container having a diameter of 50 mm; and
the force is a value obtained by measurement using a rheometer.
6 . The method as set forth in claim 1 , wherein a volume-average particle size of the fine polymer particles (A) is not more than 0.23 μm.