A METHOD FOR MODIFYING A BLOWING AGENT

摘要

A method for modifying a blowing agent is provided to realize process reduction and productivity improvement by omitting a part of the conventional blowing agent process steps, and to produce a modified blowing agent having excellent resin dispersibility and improved resin flowability in a resin composition. A method for modifying a blowing agent includes a step of applying a metal siloxane-based compound or silane compound onto the surface of a blowing agent in a wet cake state. The wet cake contains 15-25% of water based on the total weight thereof. The metal siloxane-based compound or silane compound is not diluted with a solvent and sprayed onto the surface of the blowing agent. The metal siloxane-based compound or silane compound has a viscosity of 50-1000 cP. The metal siloxane-based compound is any one of compounds represented by the following formulae 1-3.