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Composition and method for extruding plastic articles having accent color pattern

  • US 5,866,054 A
  • Filed: 11/06/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 04/03/1996
  • Status: Expired due to Fees
First Claim
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1. A method of producing a capstock having a controllable and realistic wood-grain appearance, the capstock with at least one accent color, the method comprising the steps of:

  • a) introducing into an extruder a capstock base material and accent color pellets, said capstock base material having a vicat softening temperature, said accent color pellets (i) having a higher vicat softening temperature than said capstock base material, and (ii) comprising poly-α

    -methylstyrene having a high vicat softening temperature and a melt flow index of greater than or equal to 1.0 gram per 10 minutes, and at least one additional resin having a substantially lower vicat softening temperature than the poly-α

    -methlstyrene; and

    b) extruding said capstock base material and said accent color pellets through an extrusion die to form a capstock under processing temperatures whereby the accent color pellets cause delayed introduction and controlled dispersion of the accent color into the capstock base material.

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