POLYMER COMPOSITION FOR MANUFACTURING FILM ENVELOPS Russian patent published in 2004 - IPC

FIELD: polymer materials. SUBSTANCE: polymer composition than can be used for manufacturing envelops for greenhouses contains 0.02-0,5% europium-activated yttrium oxysulfide, 0.04-4.5% IR corrector, 0.1-1.0% thermo-and-photo stabilizer, and thermoplastic material - the rest. IR corrector is a light correcting additive, which absorbs and transforms infrared constituent of sun emission into visible emission and/or into infrared emission with different wavelength. IR corrector can be selected from compounds of the type M-Ln, where M denotes yttrium (lanthanum) oxysulfide, yttrium (lanthanum) (oxy)halide, or barium (calcium) (oxy)halide; and Ln denotes erbium or ytterbium; and also compounds of the type M-Er, where M denotes calcium tungstenate or yttrium oxysulfide and Er erbium. Particles of indicated composition components are below 20 mcm in size. Above-mentioned thermoplastic material is polyethylene and thermo-and-photo stabilizers are tivunin 622 and tivunin 783. EFFECT: increased portion of light energy in spectrum region stimulating photosynthesis in plants, and enabled protection of plants against overheating during hot time. 3 cl, 1 dwg, 4 tbl, 9 ex