Polyvinyl alcohol fibers, and nonwoven fabric comprising them
AssigneeKuraray Co., Ltd.
InventorsHideki Kamada, Tomohiro Hayakawa
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Abstract
Readily-fibrillable fibers of PVA polymer, having good chemical resistance, hydrophilicity, weather resistance and water resistance have a flattened cross-sectional profile and have a mean thickness D (μm) that satisfies the following formula (1): 0.4≦D≦5 (1) wherein D=S/L; S indicates the cross-section area (μm2) of the fibers; and L indicates the length (μm) of the major side of the cross section of the fibers. The fibers can be used for making nonwoven fabrics.
Claims29
Polyvinyl alcohol fibers having an extremely flattened cross-sectional profile and having a mean thickness D (μm) that satisfies the following formula (1):
- 0.4≦D≦5 (1),
- wherein
- D=S/L;
- D indicates the mean thickness (μm) of the fibers which is a mean length (μm) of the minor side of the cross section of the fibers;
- S indicates the cross-section area (μm2) of the fibers;
- and
- L indicates the length (μm) of the major side of the cross section of the fibers;
- wherein said polyvinyl alcohol fibers consist of polyvinyl alcohol and from 0.01 to 30% by mass of a layered compound having a mean particle size of from 0.01 to 30 μm and wherein said layered compound is smectite, montmorillonite or mica.
Polyvinyl alcohol fibers having an extremely thinly flattened cross-sectional profile and having a mean thickness D (μm) that satisfies the following formula (1):
- 0.4≦D≦5 (1),
- wherein
- D=S/L;
- D indicates the mean thickness (μm) of the fibers which is a mean length (μm) of the minor side of the cross section of the fibers;
- S indicates the cross-section area (μm2) of the fibers;
- and
- L indicates the length (μm) of the major side of the cross section of the fibers;
- wherein said polyvinyl alcohol fibers consist of polyvinyl alcohol and from 0.01 to 30% by mass of a layered compound having a mean particle size of from 0.01 to 30 μm and wherein said layered compound is smectite, montmorillonite or mica.
Dependencies are inferred from the claim text.