Patent ID: 7641833

Claim:
A method for producing a resin composition pellet comprised of a resin (A) and a fibrous filler (B), the method comprising: (a) supplying to an extruder an amount of 55 to 80% by weight of feed pellets comprised of the resin (A) and 20 to 45% by weight of the fibrous filler (B), the fibrous filler (B) having a weight average fiber length (L) of 1 mm or more based on the total weight of the resin (A) and the fibrous filler (B), wherein the step of supplying the resin (A) and the fibrous filler (B) to the extruder includes: (i) supplying one part containing an amount (x) of the feed pellets comprised of the resin (A) through a main feed port of the extruder; and (ii) supplying the fibrous filler (B) and a remaining part of the feed pellets comprised of the resin (A) containing an amount (1−x) through a side-feed port provided downstream of the main feed port in an extrusion direction of the extruder so that a weight ratio of x/(1−x) is 50/50 to 10/90 (b) melt-blending the one and another parts of the resin (A) with the fibrous filler (B) within the extruder to achieve a weight average fiber length (I) of the fibrous filler (B) of 180 to 360 μm based on the total weight of the resin (A) and the fibrous filler (B), and thereafter (c) forming a pellet of the melt-blended resin (A) and the fibrous filler (B).