Polyolefin film for agricultural use
AssigneeAlcudia Empresa Para la Industria Quimica, S.A.
InventorGraciano J. Tapia
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Abstract
Polyethylene or EVA copolymer film which includes up to about 15% by weight of an additive preferably a mixture of alunite - aluminum hydroxide is disclosed for particular use as a cover for agricultural purposes. The disclosed film has improved properties which provide growth of plants and/or crops by reducing thermal losses to the atmosphere and by minimizing shadow formation. The physical characteristics of the film are equal to or better than conventional films.
Claims14
Polymeric composition especially well suited for agricultural use comprising from about 80% or more polyolefin and from about 1% to about 15% by weight of an additive referred to as a basic metallic sulfate and having the formula
- (SO.sub.4).sub.4 M.sub.6.sup.111 . M.sub.2.sup.1 12(OH)
- wherein
- M.sup.1 is a monovalent metal,
- M.sup.111 is a trivalent metal,
- said film having low thermal transmittance properties between 7 and 14 micron wavelengths and excellent light diffusion properties.
Polymeric film for covering plants or crops comprising polyethylene or copolymers thereof with an effective amount of basic metallic sulfate having the formula:
- (SO.sub.4).sub.4 M.sub.6.sup.111 M.sub.2.sup.1 12(OH)
- wherein
- M.sup.1 is a monovalent metal,
- M.sup.111 is a trivalent metal, for imparting to said film low thermal transmittance properties between 7 and 14 microns and excellent light diffusion properties.
Dependencies are inferred from the claim text.