Polyester binder fibers

Patent metadata

Field	Value
Publication number	US-10253434-B2
Application number	US-201615277087-A
Country	US
Kind code	B2
Filing date	Sep 27, 2016
Priority date	Mar 31, 2014
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

To provide a polyester binder fiber with improved adhesiveness and a fiber structure containing the polyester binder. (1) A polyester binder fiber includes a polyester and a polymer having a repeating unit represented by the following formula (1) in a proportion of 0.1 to 5.0 mass % based on the mass of the polyester, and the polyester binder fiber has a crystallization temperature measured by differential calorimetry in a range of 100 to 250° C.; (2) a fiber structure includes the polyester binder fibers, and polyester subject fibers without a crystallization temperature, the polyester subject fibers being bonded via the polyester binder fiber.

In the formula R 1 and R 2 are substituents each comprising arbitrary atoms chosen from C, H, N, O, S, P, and a halogen atom, the sum of the molecular weights of R 1 and R 2 is 40 or more, and n is a positive integer.

First claim

What is claimed is:

1. A polyester binder fiber comprising:
a polyester; and
a polymer having a repeating unit represented by the following formula (1) in a proportion of 0.1 to 5.0 mass % based on the mass of the polyester,
the polyester binder fiber having a crystallization temperature measured by differential calorimetry in a range of 100° C. or higher and 250° C. or lower,
wherein the polyester binder fiber is an undrawn fiber, has a fiber length of 0.5 to 50 mm, and has a single fiber fineness of 0.01 to 5.0 dtex,

wherein R 1 and R 2 are substituents each comprising arbitrary atoms chosen from C, H, N, O, S, P, and a halogen atom, the sum of the molecular weights of R 1 and R 2 is 40 or more, and n is a positive integer.

2. The polyester binder fiber as claimed in claim 1 , wherein the polymer having a repeating unit represented by the formula (1) is a polymethyl methacrylate.

3. The polyester binder fiber as claimed in claim 1 , wherein the polyester comprises a polyethylene terephthalate.

4. The polyester binder fiber as claimed in claim 1 , wherein the polyester has an intrinsic viscosity of 0.4 to 1.1 dL/g.

5. The polyester binder fiber as claimed in claim 1 , wherein the polyester binder fiber has a single fiber fineness of 0.01 to 1.0 dtex.

6. The polyester binder fiber as claimed in claim 1 , wherein the polyester binder fiber has a fiber cross-sectional shape of circular, modified, hollow, or conjugated.

7. A fiber structure comprising:
the polyester binder fibers as recited in claim 1 , and
polyester subject fibers each of which does not show a crystallization temperature, the polyester subject fibers being bonded via the polyester binder fibers.

8. The fiber structure as claimed in claim 7 , wherein the fiber structure is a nonwoven fabric.

9. The fiber structure as claimed in claim 8 , wherein the nonwoven fabric is a wetlaid nonwoven fabric.

10. The fiber structure as claimed in claim 9 , wherein the wetlaid nonwoven fabric is a paper.

11. The polyester binder fiber as claimed in claim 1 , wherein the polyester binder fiber has a fiber length of 1 to 25 mm.

12. The polyester binder fiber as claimed in claim 1 , wherein the polyester binder fiber has a fiber length of 2 to 15 mm.

Assignees

• Kuraray Co

Inventors

• Nakamura Takashi
• Oomae Yoshinobu

Classifications

• D21H21/18

  Reinforcing agents · CPC title

• D21H15/02

  characterised by configuration · CPC title

• D21H13/24

  Polyesters · CPC title

• D01F6/92 Primary

  of polyesters · CPC title

• D01F1/10

  Other agents for modifying properties · CPC title