Polymer fibre

Patent metadata

Field	Value
Publication number	US-9713653-B2
Application number	US-201214345363-A
Country	US
Kind code	B2
Filing date	Sep 20, 2012
Priority date	Sep 20, 2011
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

The present invention provides a polymer fiber comprising a thermoplastic polymer comprising the following building blocks A and B: —O—(CH 2 —CH 2 —O)n— (A) —O—[CH 2 ]y—O— (B), wherein n is an integer of 10-400, and y is an integer in the range of 2 to 16, wherein A is present in an amount of 15-30 mole %, B is present in an amount of 20-40 mole % and wherein building blocks A and B are linked by the following linking group C: —[(C═O)—NH—CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —NH—(C═O)]— (C) wherein C is present in an amount of 45-55 mole %. The present invention further relates to a method for preparing a polymer fiber, absorbent articles comprising a polymer fiber and the use of a fiber in a product for treating wounds and/or burns.

First claim

The invention claimed is:

1. An absorbent article comprising a polymer fibre comprising a thermoplastic polymer consisting of building blocks A and B and linking group C:
—O—(CH 2 —CH 2 —O) n —  (A)

—O—[CH 2 ] y —O—  (B)

wherein:
n is an integer of 10-400, and
y is an integer of 4 to 16
wherein:
A is present in an amount of 15-30 mole %,
B is present in an amount of 20-40 mole %,
wherein building blocks A and B are linked by the following linking group C:
—[(C═O)—NH—CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —CH 2 —NH—(C═O)]—  (C)

wherein:
C is present in an amount of 45-55 mole %,
wherein the thermoplastic polymer has a melting point of at least 100° C.,
wherein the polymer fibre is in fibre form at 70° C., and
wherein the absorbent article is a wound dressing.

2. The absorbent article according to claim 1 , wherein linking group C originates from hexamethyl diisocyanate (HDI).

3. The absorbent article according to claim 1 , wherein building block A originates from polyethylene glycol (PEG).

4. The absorbent article according to claim 3 , wherein the number average molecular weight of said PEG is between 400-16000 g/mole.

5. The absorbent article according to claim 3 , wherein A originates from a first PEG and a second PEG, wherein the number average molecular weight of the first PEG is different than the number average molecular weight of the second PEG.

6. The absorbent article according to claim 5 , wherein the molar ratio between the first PEG and the second PEG is from 1:1 to 1:10.

7. The absorbent article according to claim 5 , wherein the first PEG has a number average molecular weight of 400 to 3,000 g/mole and the second PEG has a number average molecular weight of 6,000 to 16,000 g/mole.

8. The absorbent article according to claim 7 , wherein the molecular weight of the first PEG is from 1,000 to 2,000 g/mole and the molecular weight of the second PEG is from 6,000 to 9,000 g/mole.

9. The absorbent article according to claim 1 , wherein the thermoplastic polymer is substantially linear.

10. The absorbent article according to claim 1 , wherein the thermoplastic polymer comprises soft and hard segments and wherein said hard segments comprises B and C building blocks and said soft segments comprises A building blocks.

11. The absorbent article according to claim 1 , wherein B originates from at least one diol.

12. The absorbent article according to claim 11 , wherein said at least one diol is selected from the group consisting of 1,4 butanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, cyclododecanediol, 1,14-tetradecanediol, and 1,16-hexadecanediol.

13. The absorbent article according to claim 12 , wherein the at least one diol is 1,4 butanediol.

14. The absorbent article according to claim 1 , wherein the polymer fibre has a thickness below 0.2 mm.

15. The absorbent article according to claim 1 , wherein the fibre absorbs at least 10 gram of a solution comprising 8.298 g/L NaCl and 0.368 g/L CaCl 2 per gram of fibre.

16. The absorbent article according to claim 1 , wherein the fibre has a tenacity of at least 10 cN/tex.

17. The absorbent article according to claim 1 , wherein the polymer fibre comprises at least one substance internally and/or externally.

18. The absorbent article according to claim 17 , wherein said at least one substance internally and/or externally is selected from an antimicrobial agent selected from the group consisting of silver, silver salts, zinc, zinc salts, iodine, iodine complexes, poly hexamethyl biguanide, and chlorhexidine and/or any mixtures or combinations thereof; and/or any of the following: vitamins, peptides, growth factors, and nucleic acids and/or mixtures or combinations thereof.

19. The absorbent article according to claim 1 , wherein the thermoplastic polymer comprises additives for improved runability, spreading of liquids, luster, or feel, added internally and/or externally.

20. The absorbent article according to claim 1 , wherein the polymer fibre comprises at least one additional thermoplastic polymer.

21. The absorbent article according to claim 20 , wherein the polymer fibre is obtained by spinning said thermoplastic polymer together with said at least one additional thermoplastic polymer to form core-sheath, island-in-a-sea, or side-by-side wherein two or more polymers are combined.

22. The absorbent article according to claim 1 , wherein the polymer fibre has a dtex value of less than 20.

23. A method for providing the absorbent article of claim 1 , comprising
a) providing the thermoplastic polymer of claim 1 , wherein the molar ratio of building block (A) to building block (B) is from 20:80 to 65:35;
b) melting said thermoplastic polymer; and
c) preparing the polymer fibre from the melted polymer obtained in step b).

24. A method according to claim 23 , wherein step (c) is carried out by melt spinning or by processing the polymer in non-woven melt processes.

Assignees

• Moelnlycke Health Care Ab

Inventors

• Doerr Sebastian
• Hansson Dennis

Classifications

• Y10T428/2967

  Synthetic resin or polymer · CPC title

• A61L15/26 Primary

  Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)} · CPC title

• D01F1/10

  Other agents for modifying properties · CPC title

• C08G18/73

  acyclic · CPC title

• C08G18/3206

  aliphatic · CPC title