| 摘要 |
PURPOSE:An agricultural film having improved light transmission properties and heat retaining properties, capable of regulating infrared absorption range, comprising a film structure of thermoplastic resin containing specific hydrotalcite as an inorganic infrared light absorber. CONSTITUTION:100pts.wt. thermoplastic resin is blended with about 1-20pts.wt. hydrotalcite having <= about 5mum, preferably <=2mum average secondary particle diameter and <= about 30m<2>/g, preferably <=25<2>/g specific surface area of BET, shown by the formula (M<2+> is bivalent metal ion such as Ca, Zn, etc.; A<n-> is n valent anion such as Cl<->, SiO3<2->, etc.; 0<x<0.5; 0<=m<=2) to mold a film about 10-200mu thickness. The film shows improved infrared absorption ability in a wide infrared light range of about 5mu-50mu, and the infrared absorption ability can be regulated by selecting a metal ion and/or anionic component of the hydrotalcite.
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