Degradable polymer fibres comprising polylactide and material made from the fibres

A fibrous polylactide material comprises a plurality of polylactide containing fibres prepared from a polylactide composition containing polylactide having less than 5wt% R-lactic acid, a lactide concentration of less than 0.5wt% and a number average molecular weight of 25,000 and 150,000. The plura...

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Bibliographische Detailangaben
Hauptverfasser:	BROSCH, ANDREA LEE, RYAN, CHRISTOPHER M, BUEHLER, NANCY UZELAC, GESSNER, SCOTT LOUIS
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS BRAIDING CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS COTTON-WOOL FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS 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 NATURAL OR ARTIFICIAL THREADS OR FIBRES NON-WOVEN FABRICS PERFORMING OPERATIONS SPINNING TEXTILES TRANSPORTING TRIMMINGS WADDING
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Beschreibung
Zusammenfassung:	A fibrous polylactide material comprises a plurality of polylactide containing fibres prepared from a polylactide composition containing polylactide having less than 5wt% R-lactic acid, a lactide concentration of less than 0.5wt% and a number average molecular weight of 25,000 and 150,000. The plurality of polylactide containing fibres exhibits a crystallinity of greater than 20 J/g, a tenacity of greater than 1.5 grams/denier and an average fibre boiling water shrinkage propensity of less than 15%. The plurality of polylactide containing fibres is prepared by spunbonding the polylactide composition at a fibre velocity of 1,000 to 3,000m/min, a throughput of 0.5 and 1.2g/min/capillary and a temperature of 220-245oC and is deposited as a web.