| 摘要 |
A seed carrier, the bearing part and the overlapping part of which consist of a polymeric material, consisting of at least two macromolecular substances, chosen from group I of substances, like polyvinylalcohol with the content of over 2 % of residual acetate groups, hydrolyzate of an ethylene-vinylacetate copolymer, polymers and copolymers of acrylic acid and its derivatives, especially esters, acetates, alcoholates, cellulose and its derivatives, especially carboxymethylcellulose, polyesters of organic acids, especially esters of polyhydroxybutyric acid and polyhydroxylactic acid, polyvinylpyrrolidone and its water-soluble derivatives or copolymers, starch, modified for themoplastic processing or at least one macromolecular substance, chosen from the above given group I of substances and at least one macromolecular substance, chosen from group II of substances, like natural starch, chemically or physically modified starch, lignin and its derivatives, suitable for thermoplastic processing, polyethylene, polypropylene, polyvinylacetate and its copolymers, especially ethylene-vinylacetate copolymers. |
