COMPOSITION FOR POWDER COATING MATERIAL, POWDER COATING MATERIAL, AND COATED ARTICLE

摘要

To provide a composition for powder coating material capable of obtaining a powder coating material capable of forming a coating film having excellent weather resistance and bending processability; a powder coating material capable of forming a coating film having excellent weather resistance and bending processability; and a coated article having the coating film having excellent weather resistance and bending processability, on its surface. The composition for powder coating material comprises the following polyvinylidene fluoride (A) and at least one resin (B) selected from a group consisting of an acrylic resin, a polyester resin and an epoxy resin, wherein the content of the polyvinylidene fluoride (A) is 30 to 90 parts by mass relative to the total of 100 parts by mass of the polyvinylidene fluoride (A) and the resin (B). The polyvinylidene fluoride (A) has a melting point of 151 to 170° C. and a heterologous sequence ratio of 11 to 37%.

主权项

1. A composition for powder coating material comprising the following polyvinylidene fluoride (A) and at least one resin (B) selected from the group consisting of an acrylic resin, a polyester resin and an epoxy resin, wherein the content of the following polyvinylidene fluoride (A) is from 30 to 90 parts by mass in the total of 100 parts by mass of the polyvinylidene fluoride (A) and the resin (B):
Polyvinylidene fluoride (A): a polyvinylidene fluoride having a melting point of from 151 to 170° C. and a heterologous sequence ratio of from 11 to 37% as determined by the following method: (Method for determining heterologous sequence ratio) 19F-NMR of the polyvinylidene fluoride is measured by using deuterated N,N-dimethylformamide as a solvent and CFCl3 as an internal standard, to obtain a spectrum, and the heterologous sequence ratio is calculated by the following formula (1) from the integral value (I1) of signals derived from regular sequence appearing in the vicinity of −85 to −98 ppm in the obtained spectrum and the integral value (I2) of signals derived from heterologous sequence appearing in the vicinity of −113 to −120 ppm in the spectrum:
Heterologous sequence ratio (%)={I2/(I1+I2)}×100  (1)