PELICULAS DE POLIURETANO Y DISPERSIONES PARA SU PREPARACION

• Main Authors: PARKS, FRANKLIN, E, SANCHEZ, THELMA, C, BHATTACHARJEE, DEBKUMAR
• Format: Patent
• Language: Spanish
• Published: 16.11.2007
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; GENERAL PROCESSES OF COMPOUNDING; HUMAN NECESSITIES; HYGIENE; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MEDICAL OR VETERINARY SCIENCE; METALLURGY; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

Una película de poliuretano que comprende una película preparada a partir de una dispersión de poliuretano, preparándose la dispersión a partir de un prepolímero de poliuretano no iónico, y preparándose el prepolímero a partir de una formulación de prepolímero de poliuretano que incluye un diisocianato y un material que contiene hidrógeno activo, donde el material que contiene hidrógeno activo es una mezcla de un poliéter-diol de elevado peso molecular que tiene un peso molecular de 1000 a 4000 y un diol de bajo peso molecular que tiene un peso molecular de 60 a 750 donde: la dispersión se forma en un proceso de dos o más etapas, donde (1) en una primera etapa se forma el prepolímero, y en una etapa posterior, (2) se forma una dispersión acuosa del prepolímero, en presencia de un tensioactivo aniónico, teniendo lugar ambas etapas en ausencia de un disolvente orgánico, donde el diisocianato es MDI que tiene un contenido de isómero p, p'' de 90 a 99 por ciento. A polyurethane film is disclosed, wherein the film is prepared from a polyurethane dispersion, the dispersion being prepared from a non-ionic polyurethane prepolymer, and the prepolymer being prepared from a polyurethane prepolymer formulation including a diisocyanate and an active hydrogen containing material. The dispersion is formed in a two or more step process wherein, in a first step the prepolymer is formed and, in a subsequent step, an aqueous dispersion of the prepolymer is formed, in the presence of an anionic surfactant, both steps occurring in the substantial absence of an organic solvent. A process for preparing the film and a dispersion useful in making the film are also disclosed. The present invention substantially avoids many of the handling concerns with the dispersions and films of the prior art. Moreover, the present invention is suitable for use in applications such as, for example, medical applications, including gloves, condoms, medical bags, and catheters.