申请人:Sanyo Chemical Industries, Ltd.
公开号:EP1887027A1
公开(公告)日:2008-02-13
Resin particles which are excellent in electrostatic property, thermal storage stability and thermal properties, and have evenness of particle diameter are to be provided. The resin particles are core-shell resin particles (C2) each comprising one or more film-like shell layers (P) comprising a first resin (a) and a core layer (Q) comprising a second resin (b). Core-shell type resin particles (C2) each comprising a film-like shell layer (P) in one or more layer structure comprising a first resin (a) and a core layer (Q) in one layer structure comprising a second resin (b), wherein the weight ratio of (P) and (Q) is in a range of (0.1:99.9) to (70:30), the content of volatile components of (C2) is 2% by weight or lower, and (a) has an initial softening temperature of 40 to 270°C, a glass transition temperature of 20 to 250°C, a flow temperature of 60 to 300°C, and the difference of the glass transition temperature and the flow temperature in a range of 0 to 120°C and contains 20 to 80% by weight of vinyl acetate as constituent units.
需要提供在静电特性、热储存稳定性和热特性方面都非常出色且颗粒直径均匀的树脂颗粒。这种树脂颗粒是芯壳型树脂颗粒(C2),每个芯壳型树脂颗粒由一个或多个由第一种树脂(a)构成的膜状外壳层(P)和由第二种树脂(b)构成的芯层(Q)组成。芯壳型树脂颗粒(C2)各自包括一个或多个由第一树脂(a)组成的层结构中的膜状外壳层(P)和一个由第二树脂(b)组成的层结构中的芯层(Q),其中(P)和(Q)的重量比范围为(0.1:99.9)至(70:30)的范围内,(C2)中挥发性成分的含量为 2%(重量比)或更低,(a)的初始软化温度为 40 至 270°C,玻璃化转变温度为 20 至 250°C,流动温度为 60 至 300°C,玻璃化转变温度与流动温度之差为 0 至 120°C,且含有 20 至 80%(重量比)的醋酸乙烯酯作为组成单元。