Claims
- 1. A biodegradable nonwoven fabric comprising a fiber web composed of at least one type of cellulose-based fiber selected from the group consisting of natural fibers, regenerated fibers, acetate fibers and mixtures thereof, said fiber web bonded with a binder of a fine cellulose-chitosan composition in amounts sufficient to impart biodegradability thereto, said fine cellulose being a beaten pulp of 20-1000 .mu.m in length and less than 1 .mu.m in thickness.
- 2. A biodegradable nonwoven fabric comprising a mat of cellulose-based fibers entangled by needle punching or water-jet punching with a fine cellulose-chitosan composition applied on the surface of each fiber, said fine cellulose being a beaten pulp of 20-1000 .mu.m in length and less than 1 .mu.m in thickness, said cellulose-based fibers selected from the group consisting of natural fibers, regenerated fibers, acetate fibers and mixtures thereof.
- 3. A biodegradable nonwoven fabric as claimed in 1 or 2, wherein said natural fiber is cotton or flax, and said regenerated fiber is selected from the group consisting of viscose rayon, cuprammonium rayon, modified cross-sectional rayon, and porous rayon.
- 4. A biodegradable nonwoven fabric as claimed in 1 or 2, wherein said biodegradable nonwoven fabric is bonded with a fine cellulose-chitosan composition containing a water repellency modifier comprising a higher fatty acid.
- 5. A biodegradable nonwoven fabric as claimed in 1 or 2, wherein said nonwoven fabric is bonded with a fine cellulose-chitosan composition containing glycerine as a plasticizer.
- 6. A biodegradable nonwoven fabric as claimed in 1 or 2, wherein said nonwoven fabric is bonded with a fine cellulose-chitosan composition containing a higher fatty acid as a water repellency modifier and glycerine as a plasticizer.
- 7. A biodegradable nonwoven fabric as claimed in 1 or 2, wherein the proportion of the fine cellulose-chitosan composition is 0.5-10 parts by weight based on 100 parts by weight of the fiber.
- 8. A biodegradable nonwoven fabric as claimed in 1 or 2, wherein the mixing ratio of fine cellulose to the chitosan is 2:8 to 4:5.
- 9. A biodegradable nonwoven fabric according to claim 1 or 2 wherein said cellulose-based fiber is a natural fiber selected from the group consisting of cotton and flax.
- 10. A filter unit made of the biodegradable nonwoven fabric as claimed in 1 or 2.
- 11. A biodegradable vessel comprising the biodegradable nonwoven fabric according to claim 1 or 2, heated and molded into a required shape.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-157046 |
Jun 1989 |
JPX |
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Parent Case Info
This application is a continuation-in-part of now abandoned application Ser. No. 07/537,628 filed on Jun. 13, 1990.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3903268 |
Balassa |
Sep 1975 |
|
4056432 |
Slagel et al. |
Nov 1977 |
|
4755421 |
Manning et al. |
Jul 1988 |
|
4931551 |
Albisetti et al. |
Jun 1990 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
0285258 |
Dec 1986 |
JPX |
0062302 |
Mar 1989 |
JPX |
2216555 |
Mar 1988 |
GBX |
Non-Patent Literature Citations (2)
Entry |
English translation of Morita et al, pp. 1-26. |
English translations of Chiba et al, pp. 1-8. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
537628 |
Jun 1990 |
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