Monopolymer multifunctional sequenced cast polyurethane matrix and production method
US9763893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2013 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | May 27, 2033 |
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 mould with alternating solidification of said phase solutions according to a defined order and respecting the polymerisation stage (after the pot life and before the demoulding 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 demoulding time thereof and thereby finish the polymerisation of the whole of the matrix. It is loaded, in its “reservoir” sequences, with naturally originating or synthesised 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. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.