| 摘要 |
PURPOSE:To obtain a friction liner for holding a magnetic tape with almost the same sliding characteristics as that of ultra-high mol.wt. polyethlene by adding graphite powder, etc., to prescribed ethylene unsaturated silane compound copolymer and by executing cross-linking under the presence of water after forming a film. CONSTITUTION:An ethylene-unsaturated silane compound copolymer obtained by graft-polymerizing polyethlene having 0.1-1.0 million molecular weight with a silane radical is polyethlene of high or low density organic silane modified, and an activated silane radical of the entire polyethlene is normally below 10%. The activated silane is cross-linked under the presence of water, and a gel fraction after cross-linking is made 40-80%. After adding carbon black or graphite powder to the polymerized polyethlene, a film is formed. When the film is passed in a steam chamber, for instance, of 100-130 deg.C, the activated silane forms a network structure between moleculars. By using the polyethlene obtained in such a way, the tape holding friction liner having excellent uniformity of a surface, excellent antiwear property and excellent antifriction property can be obtained.
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