Controlled release of herbicide compounds utilizing a thermoplastic matrix
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A01N-037/38
출원번호
US-0171834
(1980-07-24)
발명자
/ 주소
Cardarelli Nathan F. (Barberton OH)
출원인 / 주소
Environmental Chemicals, Inc. (Wauconda IL 02)
인용정보
피인용 횟수 :
42인용 특허 :
7
초록▼
A composition and method for the controlled release of compounds from a plastic dispenser, usually a thermoplastic, generally in association with a porosigen in contact with water, for example, an aquatic environment or soil mixture. Thermoplastic dispensers are generally made from a water insoluble
A composition and method for the controlled release of compounds from a plastic dispenser, usually a thermoplastic, generally in association with a porosigen in contact with water, for example, an aquatic environment or soil mixture. Thermoplastic dispensers are generally made from a water insoluble polymer such as polyethylene, polypropylene, ethylene vinyl acetate, polyamide, polystyrene, polyvinyl acetate, polyurethane, etc. Thermoset plastics, such as epoxy, are also used. The porosigen, depending upon the desired end use and release rate of a compound, can have a solubility of less than 0.1 or 0.001 grams per 100 grams of water, or up to 100 grams per 100 grams of water. The released compound, for example, a herbicide, is contained in the thermoplastic dispenser. The combination of the plastic dispenser containing the porosigen and compound results in a slow release of a herbicide which can last for days, months, and even years, through dissolution of the porosigen and the formation of a porous network permitting water to contact the dispersed herbicide located in the interior portions of the dispenser.
대표청구항▼
A controlled release herbicide dispenser, comprising: (a) from about 10 parts to about 160 parts by weight of a herbicide; (b) from about 15 parts to about 80 parts by weight of an inert porosigen, said porosigen having a solubility of from about 0.0005 to about 100 grams per 100 grams of water; and
A controlled release herbicide dispenser, comprising: (a) from about 10 parts to about 160 parts by weight of a herbicide; (b) from about 15 parts to about 80 parts by weight of an inert porosigen, said porosigen having a solubility of from about 0.0005 to about 100 grams per 100 grams of water; and (c) about 100 parts of a polymer selected from the group consisting of thermoplastic polymers, thermoset polymers, and combinations thereof; said herbicide and said porosigen distributed throughout said polymer to form a controlled release herbicide dispenser so that upon contact with moisture or water, said porosigen is dissolved gradually to create a pore structure within the dispenser and, said herbicide is released at a controlled rate to retard and eliminate growth of undesired plants.
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