B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 1/00 (2006.01) B32B 5/16 (2006.01) B32B 9/04 (2006.01) B32B 13/00 (2006.01) C05B 15/00 (2006.01) C05C 9/00 (2006.01) C05G 3/00 (2006.01)
Patent
CA 2439145
The present invention relates to a controlled-release urea product and method of prepaing said product, which consists of urea coated with a primer of cement or an insoluble metal salt and one or more coating layers of a 20-50% rosin gum solution in fatty acid or vegetable oils at 20-80~C, and that the concentration of rosin gum in the said product may vary from 2 to 15%, and that inorganic materials such as magnesium oxide are applied in between layers of rosin gum at an inclusion level of 2-20% of said product.
La présente invention concerne un produit d'urée à libération commandée et un procédé de préparation de ce produit. Ce produit est constitué d'urée revêtue d'un primaire de ciment ou d'un sel métallique non soluble et d'au moins une couche de revêtement d'une solution de gomme de colophane à 20-50 % dans des acides gras ou dans des huiles végétales à 20-80 ·C. Cette concentration de gomme de colophane dans ce produit peut varier de 2 % à 15 % et des matériaux inorganiques tels que de l'oxyde de magnésium sont appliqués entre les couches de gomme de colophane à un niveau d'adjonction allant de 2 % à 20 % de ce produit.
Basile de Castro Fernando
Stockhoff Peter
Basile de Castro Fernando
Shapiro Cohen
LandOfFree
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