Biodegradable nonwoven laminate

摘要

A biodegradable nonwoven laminate is provided. The laminate comprises a spunbond layer formed from substantially continuous filaments that contain a first aliphatic polyester having a melting point of from about 50° C. to about 160° C. The meltblown layer is formed from microfibers that contain a second aliphatic polyester having a melting point of from about 50° C. to about 160° C. The first aliphatic polyester, the second aliphatic polyester, or both have an apparent viscosity of from about 20 to about 215 Pascal-seconds, as determined at a temperature of 160° C. and a shear rate of 1000 sec-1. The first aliphatic polyester may be the same or different than the second aliphatic polyester.

主权项

1. A biodegradable nonwoven laminate comprising:
a first spunbond layer formed from substantially continuous filaments that contain a first aliphatic polyester having a melting point of from about 50° C. to about 160° C., wherein the first aliphatic polyester is polybutylene succinate; and a meltblown layer formed from microfibers that contain a second aliphatic polyester having a melting point of from about 50° C. to about 160° C., wherein the second aliphatic polyester is polybutylene succinate; wherein the first aliphatic polyester and the second aliphatic polyester have an apparent viscosity of from about 30 to about 200 Pascal-seconds, as determined at a temperature of 160° C. and a shear rate of 1000 sec−1, and wherein the melt flow index of the first aliphatic polyester is from about 20 to about 120 grams per 10 minutes and the melt flow index of the second aliphatic polyester is from about 125 to about 1500 grams per 10 minutes, measured at a force of 2160 grams and temperature of 190° C. in accordance with ASTM Test Method D1238-E37, and wherein the filaments of the first spunbond layer and the microfibers of the meltblown layer are free of a multi-carboxylic acid nucleating agent.