Patent ID: 6284278
Filing Date: 2001-09-04
Classification: C05G

Abstract:
A method for the production of water-soluble granulated chemicals with slow controlled release in water and soil, comprising:encapsulating said chemicals with 15%-35% of a thermoplastic, biodegradable and inert polymer composition, whereby said encapsulating comprises the steps of:mixing an inert polymer composition with said chemicals;crushing the obtained mixture of said chemicals and said polymer composition; andmoulding the crushed mixture to form clots or granules;whereby said polymer composition is prepared bypolymerization of neutralized unsaturated carboxylic acids, or of a suitable oil, in the presence of a neutralizing agent, an amine compound and plasticizer, resulting in a polymer comprising the structure of fragment A: ##STR3##wherein R is C.sub.n H.sub.2n ; Me is metal; or a suitable oil thereof;polycondensation of thiourea and formaldehyde in the presence of an amine compound and plasticizer, resulting in a polymer comprising the structure of fragment B; and ##STR4##crosslinking fragments A and B with a sulfur-containing compound.