Hollow resin particles and application thereof

A process for producing hollow resin particles comprising;

• a step 1 which comprises dispersing an oily mixture containing a polymerizable component and a blowing agent in an aqueous dispersion medium and polymerizing the polymerizable component into heat-expandable microspheres;
• and
• a step 2 which comprises thermally expanding the heat-expandable microspheres produced in the step 1;
• wherein, in the step 1, the polymerizable component contains 0.6 to 3.0 wt % of a crosslinkable monomer having at least two polymerizable carbon-carbon double bonds per molecule and 97 to 99.4 wt % of an uncrosslinkable monomer having one polymerizable carbon-carbon double bond per molecule, the amount of the blowing agent ranges from 4 to 15 parts by weight to 100 parts by weight of the polymerizable component, and the blowing agent contains 50 to 100 wt % of an organic compound having a vapor pressure higher than 100 kPa at 25° C.