Nonwoven fabrics
AssigneeIdemitsu Kosan Co., Ltd.
InventorsKomei Yamasaki, Keisuke Funaki
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Abstract
Nonwoven fabrics are disclosed, which are produced by molding a material containing as a main component a styrene-based polymer with mainly syndiotactic configuration, in such a manner that a difference between the absolute value of heat of fusion .vertline..DELTA.Hf.vertline. and the absolute value of crystallizing enthalpy on heating .vertline..DELTA.Htcc.vertline. of the molded polymer is at least 1 cal/g. These nonwoven fabrics are excellent in heat-resistant and chemical-resistant characteristics, and are suitable for use as medical fabrics, industrial filters, battery separators and so forth.
Claims9
A method for making a nonwoven fabric comprising spinning a styrene-based polymer having a mainly syndiotactic configuration through a heated die to form a fiber and cooling and crystallizing the extruded fiber by blowing hot air onto it as it comes out of the die to form a fibrous material having a difference between the absolute value of heat of fusion .vertline..DELTA.Hf.vertline. and absolute value of crystallizing enthalpy on heating .vertline..DELTA.Htcc.vertline. of at least 1 cal/g.
In a method for making a nonwoven fabric which is producing by molding an extruded fibrous material the improvement wherein the fibrous material contained in the fabric as a main component is a styrene-based polymer with mainly syndiotactic configuration which has been extruded into a fibrous form and has a nucleating agent in an amount of 0.01 to 10 parts by weight per 100 parts by weight of the styrene-based polymer, and a difference between the absolute value of heat of fusion .vertline..DELTA.Hf.vertline. and the absolute value of crystallizing enthalpy on heating .vertline..DELTA.Htcc.vertline. of the extruded polymer of at least 1 cal/g.
Dependencies are inferred from the claim text.