Back to results
US 5,211,959 AGranted
Processes for producing slow-release powders
AssigneeJapan Atomic Energy Research Institute
InventorsFumio Yoshii, Keizo Makuuchi, Isao Ishigaki
Life of this patent
Estimating the term…
Abstract
A process for producing a slow-release powder which permit various active ingredients such as perfumes, insect control agents, rust inhibitors, mold inhibitors and antibacterial agents to be slowly released over a prolonged time, the process comprising the steps of mixing a long-chain compound with the ingredients, mixing the resulting mixture with urea, and exposing the resulting urea adduct to radiation.
Claims4
A process for producing a slow release powder by the steps of:
- first mixing a long-chain compound and a slow-releasable substance, wherein the weight ratio of said long-chain compound to said slow-releasable substance ranges from 1:0.1 to 1:10;
- and
- then mixing the resulting mixture with urea at a temperature ranging from 20.degree. to 80.degree. C., wherein the molar ratio of said urea to said long-chain compound ranges from 1:5 to 1:15,
- wherein said long-chain compound has a molecular weight of at least 100, said long-chain compound facilitating the incorporation of said slow-releasable substance into said urea to form a urea adduct, wherein said long chain compound is selected from the group consisting of hexyl alcohol, n-octyl alcohol, nonyl alcohol, decyl alcohol, undecyl alcohol, lauryl alcohol, n-capric acid, caproic acid, lauric acid, oleic acid, linoleic acid, stearic acid, 1,6-hexanediol diacrylate, 1,6-hexanediol monoacrylate, lauryl acrylate, stearyl acrylate and caprolactone modified 2-hydroxyethyl acrylate, and
- wherein the slow-releasable substance is selected from the group consisting of a natural perfume, a synthetic perfume, an insect control agent, an insect killing agent, a rust inhibitor, a mold inhibitor and an antibacterial agent.
2 more elements
A process for producing a slow release powder by the steps of:
- mixing a long chain compound with a slow-releasable substance, wherein the weight ratio of said long-chain compound to said slow-releasable substance ranges from 1:0.1 to 1:10;
- mixing the resulting mixture with urea at a temperature ranging from 20.degree. to 80.degree. C., wherein the molar ratio of said urea to said long-chain compound ranges from 1:5 to 1:15;
- and
- exposing the resulting urea adduct to radiation, wherein the dose of radiation ranges from 5 to 100 kGy,
- wherein said long-chain compound has a molecular weight of at least 100 and is polymerizable upon exposure to radiation, said long-chain compound facilitating the incorporation of said slow-releasable substance into said urea to form a urea adduct, wherein said long chain compound is selected from the group consisting of oleic acid, linoleic acid, 1,6-hexanediol diacrylate, 1,6-hexanediol monoacrylate, lauryl acrylate, stearyl acrylate and caprolactone modified 2-hydroxyethyl acrylate, and
- wherein the slow-releasable substance is selected from the group consisting of a natural perfume, a synthetic perfume, an insect control agent, an insect killing agent, a rust inhibitor, a mold inhibitor and an antibacterial agent.
3 more elements
Dependencies are inferred from the claim text.