| 摘要 |
PURPOSE:To provide a purging agent and method for enabling polyolefin resin to be molded normally in a short time during the period of carrying out in common use of a forming apparatus both extrusion molding of ethylene unsaturated carboxylic acid copolymer resin and extrusion molding of polyolefine resin by eliminating resin from the inner part of the molding apparatus after the molding of the former. CONSTITUTION:The purging agent consists of (1) polyethylene with a melt flow rate of 0.5-5g/10min under the load of 2160g, (2) at 190 deg.C, ethylene- unsaturated carboxylic ester copolymer, (3) an inorganic filling agent, (4) a chemical foaming agent, and (5) a slipping agent, and after extrusion-molding ethylene-unsaturated carboxylic copolymer resin, the purging agent is supplied prior to the molding of polyolefine resin, and then subjected to melt-extrusion, thereby obtaining a method of purging ethylene-unsaturated carboxylic copolymer resin that resides in the molding machine. |
