Structure and ways for extruding plastic articles having accent color design

A new and beneficial a plastic article, particularly plastic siding, with an accent color pattern incorporated in it, a specially structured accent color pellet which is useful in yielding such an article, and a process for producing the article adopting the provided pellets. The process and uniquely formed accent color pellets. The accent color pellets are alloyed masses of resins and pigmentthat are bigger than the powder particles of the base material, and also, possess a higher vicat softening point temperature than that of the base material. The alloyed pellets are designed to melt controllably and to mix controllably with the base material. During the extrusion process, the accent color pellets set about to soften and disperse later than the base material, and result in controllable dispersion of the accent color into the base material, thereby producing accent color streaks in the resulting product having controllable characteristics. The process is particularly suited for producing a pseudo wood-grain or streaking effect in plastic siding, and as described can create hard streaking, soften streaking, and a mottled or variegated streaking in which more than one accent color is used at the same time. A novel formulation for the accent color pellets is put forward, in which poly-α-methyl styrene is used as the only high vicat softening temperature resin.