POLYURETHANE POROUS STRUCTURE AND PRODUCTION THEREOF

• Main Authors: MURAKAMI SOICHI, MORISHIGE YOSHIAKI, OGAWA YASUHIRO
• Format: Patent
• Language: English
• Published: 19.07.1988
• Subjects: BRAIDING; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; COTTON-WOOL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR; HUMAN NECESSITIES; HYGIENE; KNITTING; LACE-MAKING; LAUNDERING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MEDICAL OR VETERINARY SCIENCE; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; NON-WOVEN FABRICS; PERFORMING OPERATIONS; TEXTILES; TRANSPORTING; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS; TRIMMINGS; WADDING; WALL, FLOOR OR LIKE COVERING MATERIALS, e.g. LINOLEUM,OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF AFIBROUS WEB COATED WITH A LAYER OF MACROMOLECULARMATERIAL

PURPOSE:To obtain the titled structure outstanding in expansibility, flexibility and moisture permeability, useful as, e.g. a medical material, by integrating a polyurethane nonwoven fabric or its formed product and polyurethane porous layer. CONSTITUTION:The objective structure can be obtained by impregnating or coating a polyurethane nonwoven fabric or its formed product with a polyurethane solution or polyurethane emulsion followed by wet regeneration treatment (or dry treatment) to form a polyurethane porous layer. Said formed product is made by winding the nonwoven fabric mentioned above on a core rod coated with fluororesin followed by forming on heating to make a cylindrical body on which a polyurethane porous layer is formed. This structure is high in extensibility with cushioning nature and moisture permeability, therefore being useful as a medical material.