Patent ID: 8505237

Claim:
A process for enhancing bio-mass production in agricultural applications, by incorporating one or more pigments in a thermoplastic or crosslinked polymer, which is in the form of a film or glazing for greenhouses or small tunnel covers, a film or filament for shading nets and screens, mulch films, non-wovens or molded articles for the protection of young plants; and exposing the plant through or over that thermoplastic or crosslinked polymer to actinic radiation, characterized in that a) the resulting average light intensity variations (LIV) in the range between 380 and 450 nm are such that ( LIV 410-450 −LIV 380-410 )/| LIV 410-450 |={[( I−I 0 )/ I 0 ] 410-450 −[( I−I 0 )/ I 0 ] 380-410 }/{absolute value of [( I−I 0 )/ I 0 ] 410-450 }≦0.04; b) the resulting average light intensity variations in the range between 410 and 500 nm are such that ( LIV 410-450 −LIV 450-500 )/| LIV 410-450 |={[( I−I 0 )/ I 0 ] 410-450 −[( I−I 0 )/ I 0 ] 450-500 }/{absolute value of [( I−I 0 )/ I 0 ] 410-450 }≦−0.15; and c) the resulting average light intensity variation in the range between 410 and 450 nm LIV 410-450 =−0.90≦[( I−I 0 )/ I 0 ] 410-450 ≦−0.10 or +0.05≦[( I−I 0 )/ I 0 ] 410-450 ≦+0.50; wherein I 0 in the respective wavelength range is the average light intensity in the range of the sample without pigment, multiplied by the wavelength interval; I in the respective wavelength range is the average light intensity in the range of the sample containing the pigment, multiplied by the wavelength interval and wherein the pigments are selected from the group consisting of C.I. Pigment Yellow 184, C.I. Pigment Yellow 93, C.I. Pigment Yellow 95, C.I. Pigment Yellow 168, C.I. Pigment Yellow 68, C.I. Pigment Yellow 183, C.I. Pigment Yellow 109, C.I. Pigment Yellow 13, C.I. Pigment Yellow 62, C.I. Pigment Yellow 199, C.I. Pigment Yellow 110, C.I. Pigment Yellow 128, C.I. Pigment Yellow 180, C.I. Pigment Yellow 155, C.I. Pigment Yellow 151, C.I. Pigment Yellow 215, C.I. Pigment Yellow 138 and C.I. Pigment Yellow 139.