Blanchard, Flynn, Thiel, Boutell & Tanis
Method of promoting the growth of plants
 A method of promoting the growth of plants which comprises applying to the surface of a plant growth medium to be exposed to a source of ultraviolet radiation a light-degradable mulching film for agricultural use, comprising a resin composition, whose resin components consist essentially of PA1 (1) from 5 to 50 percent by weight of polyisobutylene oxide resin, PA1 (2) the balance of a second resin component selected from the group consisting of at least one polyolefin resin and a mixture of at least one polyolefin resin and at least one polydiene resin. The resin composition can be made into a mulching film which, when exposed to the sunlight, photolytically degrades into a pulverized condition within a selected period of time. 
Daicel Ltd.
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Shoji Kazunobu Masahiko
Watanabe Tanaka Kusumoto