Abstract
We investigated a powder coating made from polyester and acrylic resin. As a result, we have found that polyester-acrylic hybrid resin (hereinafter abbreviated as hybrid resin) which is composed of the two resins and copolymer formed by reaction of resins shows the characters of each resin.
In this paper, the film morphlogy and properties in relation to the copolymer content was discussed by a comparison between blend of the two resins and hybrid resin. The copolymer content was examined with a 13C NMR and film morphology was observed with a transmission electron microscope.
Change in morphology and compatibility, caused by the formation of copolymer, was observed.
The film consists of two layers, that is, the surface layer is composed of acrylic resin and the inner layer showing phase separation structure. If the content is appropriate, brittle acrylic resin is dispersed as small domain in polyester matrix. Then the film shows improved toughness and good surface properties owing to the surface layer. On the other hand, if the content is excess, the phase separation structure is unstable to deteriorate the above properties.
