| 摘要 |
PROBLEM TO BE SOLVED: To provide pre-expanded particles of a styrene-modified polyethylene-based resin, which have excellent moldability and high anti-cracking properties even after a foaming agent is scattered. SOLUTION: The pre-expanded particles of the styrene-modified polyethylene-based resin are produced by pre-expanding the styrene-modified polyethylene-based resin obtained by using 100 parts weight polyethylene-based resin and 150-300 parts weight styrenic monomer and contain 10-35 wt.% hot xylene-insoluble gel content. The method for producing the pre-expanded particles of the styrene-modified polyethylene-based resin comprises a step of continuously adding the styrenic monomer to the polyethylene-based resin of polymerization temperature so that the concentration of the styrenic monomer in the polyethylene-based resin when 35 wt.% of the amount of the whole styrene monomer to be added continuously is completed is made within 20-35 wt.% of the concentration of the styrenic monomer in the polyethylene-based resin when 75 wt.% of the amount of the whole styrenic monomer to be added continuously is completed. COPYRIGHT: (C)2010,JPO&INPIT
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