Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A fibrous structure having a roughened surface formed by projections containing fine particles, wherein at least the surface layer of the fibers at at least the face of the fibrous structure has irregularities whose structure is such that the distance between the adjacent projections is 0.01 to 0.7 micrometer and the area of concave parts accounts for 0.1 to 0.8 square micrometer -peri square micrometer of the irregularities.
Claim 2
Dependent Claim
68 words
A fibrous structure having a roughened surface formed by projections containing fine particles, wherein at least the surface layer of the fibers at at least the face of the fibrous structure has irregularities whose structure is such that the distance between the adjacent projections is 0.01 to 0.7 micrometer and the area of concave parts accounts for 0.1 to 0.8 square micrometer -peri square micrometer of the irregularities.
Claim 3
Dependent Claim
86 words
A fibrous structure having a roughened surface as recited in Claim 1, wherein the fine particles contained in the projections on the fiber surface have an average primary particle diameter smaller than 0.5 micrometer, the height of the projections is greater than 0.02 micrometer, the minor axis of the projections in the direction parallel to the fiber surface is greater than 0.03 micrometer, the projections are present individually or in conjunction with one another, and the projections are connected through the concave parts formed among them.
Claim 4
Dependent Claim
89 words
A process for producing a fibrous structure having a roughened surface, said process comprising the steps of attaching fine particles to the fiber surface in an amount of 0.001 to 10 wt% based on the fiber, said fine particles having an average primary particle diameter smaller than 0.5 micrometer and being more inert than the fiber-constituting polymer base material in low-temperature plasma, and treating the fiber, to which said fine particles have been attached, with low-temperature plasma, whereby forming projections which are larger than the average primary particle diameter.
Claim 5
Dependent Claim
89 words
A process for producing a fibrous structure having a roughened surface, said process comprising the steps of attaching fine particles to the fiber surface in an amount of 0.001 to 10 wt% based on the fiber, said fine particles having an average primary particle diameter smaller than 0.5 micrometer and being more inert than the fiber-constituting polymer base material in low-temperature plasma, and treating the fiber, to which said fine particles have been attached, with low-temperature plasma, whereby forming projections which are larger than the average primary particle diameter.
Claim 6
Dependent Claim
44 words
A process for producing a fibrous structure having a roughened surface as recited in Claim 3, wherein the average size of the projections measured after the plasma treatment is greater than l.la, where "a" is the average primary particle diameter of the fine particles.