NONWOVEN WEB MATERIAL CONTAINING CROSSLINKED ELASTIC COMPONENT FORMED FROM A LINEAR BLOCK COPOLYMER

• Main Authors: THOMAS, OOMMAN, P, AUSTIN, JAMES, WELCH, HOWARD, M, SIQUEIRA, JOSE
• Format: Patent
• Language: English; French
• Published: 23.04.2009
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; BRAIDING; COTTON-WOOL; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HUMAN NECESSITIES; HYGIENE; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; KNITTING; LACE-MAKING; 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; MEDICAL OR VETERINARY SCIENCE; NON-WOVEN FABRICS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PERFORMING OPERATIONS; PROSTHESES; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TEXTILES; TRANSPORTING; TREATMENT OR PROTECTION OF EYES OR EARS; TRIMMINGS; WADDING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A nonwoven web material that contains an elastic component is provided. The elastic component contains a crosslinked network formed from a linear block copolymer having a monoalkenyl aromatic midblock positioned between conjugated diene endblocks (e.g., butadiene-styrene-butadiene ("B-S-B") thblock copolymer). Prior to crosslinking, such linear block copolymers have a relatively low viscosity and thus may be readily formed into a precursor elastic component that is subsequently crosslinked to achieve the desired elastic and mechanical properties. Crosslinking is typically achieved through the formation of free radicals (unpaired electrons) that link together to form a plurality of carbon-carbon covalent bonds at the conjugated diene endblocks. L'invention concerne un voile en matériau non-tissé qui contient un composant élastique. Le matériau élastique contient un réseau réticulé formé à partir d'un copolymère séquencé ramifié possédant une séquence intermédiaire aromatique monoalcényle positionnée entre des séquences d'extrémité diène conjuguées (par exemple, un copolymère triséquencé butadiène-styrène-butadiène (= B-S-B =)). Avant la réticulation, de tels copolymères séquencés linéaires présentent une viscosité relativement faible, et peuvent ainsi facilement former un matériau élastique précurseur qui est ensuite réticulé pour obtenir les propriétés élastiques et mécaniques souhaitées. La réticulation est habituellement obtenue via la formation de radicaux libres (électrons non appariés), qui se lient entre eux pour former une pluralité de liaisons covalentes carbone-carbone au niveau des séquences d'extrémité diène conjuguées.