| 摘要 |
Heat distortion temperature of polyvinyl chloride compositions can be significantly increased above the heat distortion temperature of uncompounded polyvinyl chloride while good appearance of extruded material is preserved by preblending an imidized acrylic resin having a glass transition temperature above 130 DEG C. with a third polymer melt-processable throughout the temperature range of 150 DEG -300 DEG C. under conditions where a two-phase blend is formed, wherein the third polymer forms the continuous phase and the imidized acrylic resin forms the dispersed phase and then melt-blending the two-phase blend with polyvinyl chloride at a temperature of 150 DEG -220 DEG C. to form a composition in which the imidized acrylic resin forms a substantially homogeneous blend with polyvinyl chloride. It also is possible to preblend imidized acrylic resin with a third polymer with which it is compatible, for example, another imidized acrylic resin having a sufficiently low glass transition temperature to lower the resulting glass transition temperature of the preblend below about 130 DEG C., which then is blended with polyvinyl chloride.
|
