发明名称
摘要 PURPOSE:To improve high heat-shrinkability and cracking resistance, by preparing the polymer formulation composed of the mixture of medium- or low- pressure linear low density PE (LLDPE) and ethylene-vinylacetate copolymer (EVA) or the mixture of LLDPE with the blend of EVA and high-pressure branched low density PE (BLDPE) as a tube material and making the degree of mechanical orientation before irradiation of accelerated electron beam less than 85% of shrinkability. CONSTITUTION:The polymer formulation containing 30-98pts.wt. of LLDPE as a primary component, 70-2pts.wt. of EVA or the blend of EVA and BLDPE as a secondary component and 0.1-5.0pts.wt. of an antioxidant is prepared as the tube material. Ethylene-ethyl acrylate copolymer (EEA) or the blend of EEA with BLDPE may be used as a secondary component. The sheet is formed by the polymer formulation, the degree of orientation of the sheet in the direction of the machine before irradiation of accelerated electron beam is made less than 85% of shrinkability and the degree of crosslinking is made more than 25% of the gel fraction at the state at which the heat-shrinkable tube is formed.
申请公布号 JPS5923686(B2) 申请公布日期 1984.06.04
申请号 JP19810028442 申请日期 1981.03.02
申请人 NIPPON TELEGRAPH & TELEPHONE 发明人 YAMAKAWA SHINZO;MURATA NORIO;YAMAMOTO FUMIO;KUBOTA YOSHINORI;MATSUNAGA TETSUMASA
分类号 B29C63/00;B29C45/00;B29C51/00;B29C55/00;B29C61/00;B29C61/06;B29C63/42;B29C71/04;H02G1/14 主分类号 B29C63/00
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