| 摘要 |
1402380 Protecting plants with polymer coatings MINNESOTA MINING & MFG CO 6 Aug 1973 [7 Aug 1972] 37280/73 Heading C1B A method for providing an artificial protective environment for a plant or portion (including seeds) thereof comprises contacting the plant or portion thereof with a fluid agent comprising hydrophilic urethane prepolymer of the formula in which Y<SP>1</SP> represents an active hydrogen-free residue of a compound having a plurality of active hydrogen atoms, (RO) 0 represents a hydrophilic polyoxyalkylene chain having a plurality of oxyethylene units, o is the number of oxyalkylene units in the chain, Y<SP>2</SP> represents an organic linkage bonding the polyoxyalkylene chain to the isocyanate moiety shown in the formula, p is an integer from 1 to 5, and z is an integer equal to, the number of hydrogen atoms in the compound from which Y<SP>1</SP> is derived, and curing the prepolymer in the presence of water to form a thin, discontinuous, water-insoluble, hydrophilic polyurethane - polyurea polymer coating which is adhesively bonded to said plant or portion thereof. The invention also comprises sprayable compositions for use in the method and comprising the hydrophilic urethane prepolymer, an agrichemical and a solvent. The agrichemical may be a herbicide, fungicide, root hormone or fertilizer or lime or sulphur. The invention finds application in transplanting seedlings and sowing seeds.
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