Patent ID: 8198377

Claim:
A powder coating material comprising: a thermal fluidity modifier for a powder coating material, a binder resin, and a curing agent, wherein the thermal fluidity modifier for a powder coating material comprising a polymer comprising t-butyl(meth)acrylate units and having a glass transition temperature (Tg) of 20 to 120° C. as calculated by the following equation (1): 1 /Tg =Σ( w i /Tg i ) (1), wherein w i represents a mass fraction of monomer i which constitutes the polymer and Tg i represents a glass transition temperature of a homopolymer of the monomer i, wherein an amount of the t-butyl(meth)acrylate units is in the range of from 55 to 75 parts by mass in 100 parts by mass of a total monomer units, based on a monomer charge composition, and a solubility parameter (δ) of the polymer as calculated by the following equation (2) is 18.55 to 18.80 (J/cm 3 ) 1/2 , δ=Σ( m i δ i ) (2), wherein m i represents a mole fraction of the monomer i which constitutes the polymer and δ i represents a solubility parameter of the monomer i.