Monopolymer multifunctional sequenced cast polyurethane matrix and production thereof
US10350175B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2017 |
| Grant date | Jul 16, 2019 |
| Priority date | — |
| Expiry date | May 18, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J2475/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to a monopolymer multifunctional sequenced cast polyurethane matrix produced simply and efficiently, by sequentially pouring various isocyanate/polyol complex phase solutions successively into a mold with alternating solidification of said phase solutions according to a defined order and respecting the polymerization stage (after the pot life and before the demolding time) of the sequence preceding the one being cast, so as to end with the casting of the last phase solution that will go up to the demolding time thereof and thereby finish the polymerization of the whole of the matrix. It is loaded, in its “reservoir” sequences, with naturally originating or synthesized transdermally penetrating or volatile active substances. They are medicating and therapeutic, cosmetic, phytosanitary or wellness substances, repellents, attractants, pheromones, biocides, perfumes or deodorants. At least two active substances can be loaded into the same matrix in order to act unidirectionally or in opposite directions. Said matrix is used to form different devices that adhere to the skin or any other surface, in order to deliver at least one substance in a controlled manner. Sai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.