Thermal fluidity modifier for powder coating material, method for producing the same, and powder coating material
View Patent ↗Disclosed are a thermal fluidity modifier for a powder coating material, which contains a polymer containing 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; and a powder coating material containing the thermal fluidity modifier.
1. 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.
2. The powder coating material according to claim 1 , wherein a mass average molecular weight (Mw) of the thermal fluidity modifier for the powder coating material is 5,000 to 50,000.
3. The powder coating material according to claim 1 , wherein an amount of the thermal fluidity modifier in the powder coating material is in the range of from 0.1 to 5 parts by mass in 100 parts by mass of a total of the binder resin, curing agent, and thermal fluidity modifier.
4. The powder coating material according to claim 2 , wherein an amount of the thermal fluidity modifier in the powder coating material is in the range of from 0.1 to 5 parts by mass in 100 parts by mass of a total of the binder resin, curing agent, and thermal fluidity modifier.
5. The powder coating material according to claim 1 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises i-butyl(meth)acrylate units.
6. The powder coating material according to claim 2 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises i-butyl(meth)acrylate units.
7. The powder coating material according to claim 3 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises i-butyl(meth)acrylate units.
8. The powder coating material according to claim 4 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises i-butyl(meth)acrylate units.
9. The powder coating material according to claim 1 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises lauryl methacrylate units.
10. The powder coating material according to claim 2 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises lauryl methacrylate units.
11. The powder coating material according to claim 3 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises lauryl methacrylate units.
12. The powder coating material according to claim 4 , wherein the polymer comprising t-butyl(meth)acrylate units also comprises lauryl methacrylate units.