Patent ID: 7319078
Filing Date: 2008-01-15
Classification: B01D,D04H,Y10T

Abstract:
1. A porous fibrous structure, comprising: from 10 to 100% by weight of (1) wet heat bonding fibers which contain a polymer which is softened in water at about 95 to 100° C. and which bond to each other or bond to other fibers, and 90 to 0% by weight of (2) synthetic or semi-synthetic fibers, wherein (1) and (2) are present in total amount of 100%, wherein a plurality of cellular cavities are present independently or in a state wherein a plurality of said cellular cavities are connected partially in the inside of the fibrous structure, wherein at least a portion of the fibers constituting the fibrous structure are heat bonded by the wet heat bonding fibers (1), and wherein the porous fibrous structure has a porosity of 80% or more; wherein said porous fibrous structure is obtained by impregnating a fibrous structure comprising said 10 to 100% by weight of wet heat bonding fibers (1) and 90 to 0% by weight of fibers (2), with water, to obtain a water-containing fibrous structure, heating the water-containing fibrous structure to evolve bubbles by boiling the water in the fibrous structure, forming said plurality of cellular cavities in the inside of the fibrous structure, and simultaneously, heat bonding at least a portion of the fibers of the fibrous structure, thereby obtaining said porous fibrous structure.