초록 ▼

The present invention relates to a method of making a breathable nonwoven fabric having enhanced moisture barrier properties. In particular, the invention pertains to a method of making a meltblown fibrous layer having an improved hydrohead performance (e.g. greater than 40 millibars (16 inches of H

The present invention relates to a method of making a breathable nonwoven fabric having enhanced moisture barrier properties. In particular, the invention pertains to a method of making a meltblown fibrous layer having an improved hydrohead performance (e.g. greater than 40 millibars (16 inches of H.sub.2 O) and adjacent to at least one spunbond fibrous layer, wherein the method comprises secondary processing of the meltblown layer prior to bonding to spunbond layers. The resultant spunbond/meltblown (SM) nowoven fabric is breathable and characterized as having a cloth-like feel and softness and enhanced hydrohead performance rendering it suitable for use in, for example, personal hygiene, disposable industrial garment and infection control/clean room applications for items such as coverings, incontinence pads and diapers, especially as a diaper backsheet or containment flap.

대표청구항 ▼

[ We claim:] [1.] A method of making an improved meltblown fibrous layer characterized as having:(a) a hydrohead performance at least 16.5 percent greater than the hydrohead of a first meltblown layer,(b) a basis weight less than 67 g/m.sup.2 and equal to or less than the basis weight of the first m

[ We claim:] [1.] A method of making an improved meltblown fibrous layer characterized as having:(a) a hydrohead performance at least 16.5 percent greater than the hydrohead of a first meltblown layer,(b) a basis weight less than 67 g/m.sup.2 and equal to or less than the basis weight of the first meltblown layer, and(c) a water or moisture vapor transmission rate within at least 88 percent of the first meltblown layer,the method comprising(i) providing the first meltblown layer,(ii) separately secondarily processing the first meltblown layer at an elevated temperature, an elevated pressure and a residence time which equates to a roll speed of less than 20 feet/minute (6.1 m/min.) to effectuate the improvement, and(iii) collecting the improved meltblown layer.[ D-1238, Condition 230.degree. C./2.16 kg.][ D-1238, Condition 190.degree. C./2.16 kg.]