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1. (WO2018111299) MICROFIBRES OBTENUES PAR VOIE HUMIDE COMPRENANT UNE POLYOLÉFINE ET DE L'AMIDON THERMOPLASTIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

We claim:

1. Spun microfibers comprising a blend of 70 wt.% to 90 wt.% meltblown-grade polyolefin and 10 wt.% to 30 wt.% thermoplastic starch, wherein the microfibers are suitable for use in a wet-laid process.

2. The spun microfibers of claim 1 , wherein the blend prior to spinning has a melt flow index greater than 150.

3. The spun microfibers of claim 1 , wherein the microfibers are staple fibers.

4. The spun microfibers of claim 1 , further comprising a surfactant treatment.

5. The spun microfibers of claim 1 , the blend further comprising a

compatibilizer.

6. The spun microfibers of claim 1 , wherein the meltblown-grade polyolefin is polypropylene.

7. The spun microfibers of claim 1 , wherein the meltblown-grade polyolefin is polyethylene.

8. The spun microfibers of claim 1 , wherein the starch is a native starch derived from cereal grains such as corn, waxy corn, wheat, sorghum, rice, and waxy rice; tubers such as potatoes; roots such as tapioca, sweet potato, and arrowroot; or the pith of the sago palm.

9. The spun microfibers of claim 8, wherein native starch has been modified to become thermoplastic modified starch (TPMS).

10. A method for producing spun microfibers comprising:

producing a blend of 70 wt.%-90 wt.% meltblown-grade polyolefin with 10 wt.% to 30 wt.% thermoplastic modified starch (TPMS) derived from native starch; and

spinning the blend into microfibers in a fiber spinning process, wherein the microfibers are suitable for use in a wet-laid process.

11 . The method of claim 10, wherein the blend prior to spinning has a melt flow index greater than 150.

12. The method of claim 10, further comprising cutting the microfibers into staple fibers.

13. The method of claim 10, further comprising applying a surfactant treatment to the microfibers.

14. The method of claim 10, wherein the blend further comprises a

compatibilizer.

15. The method of claim 10, wherein the meltblown-grade polyolefin is polypropylene.

16. The method of claim 10, wherein the meltblown-grade polyolefin is polyethylene.

17. The method of claim 10, wherein the native starch is derived from cereal grains such as corn, waxy corn, wheat, sorghum, rice, and waxy rice; tubers such as potatoes; roots such as tapioca, sweet potato, and arrowroot; or the pith of the sago palm.

18. A method for producing an absorbent product, the method comprising: producing a blend of 70 wt.%-90 wt.% meltblown-grade polyolefin with 10 wt.% to

30 wt.% thermoplastic modified starch (TPMS), wherein the blend prior to spinning has a melt flow index greater than 150;

spinning the blend into microfibers in a fiber spinning process;

cutting the microfibers into staple fibers; and

incorporating the staple fibers into a wet-laid process for making a nonwoven web.

19. The method of claim 18, further comprising converting the nonwoven web into an absorbent product.

20. The method of claim 18, wherein the absorbent product is a tissue product.