Textile flat structure for electrical insulation

Patent metadata

Field	Value
Publication number	US-12098482-B2
Application number	US-201816611865-A
Country	US
Kind code	B2
Filing date	Apr 6, 2018
Priority date	May 11, 2017
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A textile fabric includes: a base body having at least one layer, the at least one layer comprising PEN, copolymers, and/or blends thereof as a binding component. The binding component is obtainable by applying temperatures above a glass transition temperature of a binding fiber sheath polymer to core/sheath binding fibers, in which the binding fiber sheath polymer contains PEN, copolymers, and/or blends thereof.

First claim

The invention claimed is:

1. A textile fabric, comprising:
a base body having at least one layer, the at least one layer comprising polyethylene naphthalate (PEN), copolymers of PEN, and/or blends thereof as a binding component,
wherein the binding component is obtainable by applying temperatures above a glass transition temperature of a binding fiber sheath polymer to core/sheath binding fibers, in which the binding fiber sheath polymer contains PEN, copolymers of PEN, and/or blends thereof, and
wherein the binding component is producible starting from core/sheath binding fibers in which the binding fiber sheath polymer comprises PEN, copolymers of PEN, and/or blends thereof having a non-zero degree of crystallinity of less than 80%,
wherein the binding fiber sheath polymer has a higher melting point than the binding fiber core polymer,
wherein a difference in the melting temperatures of the binding fiber sheath polymer and of the binding fiber core polymer is at least 2.5° C.,
wherein the fabric comprises matrix fibers,
wherein a difference in a degree of crystallinity between the sheath of the core/sheath binding fibers and a degree of crystallinity of the matrix fibers prior to applying temperatures above a glass transition temperature of the binding fiber sheath polymer to core/sheath binding fibers is at least 5%, and
wherein the degree of crystallinity of the matrix fibers is higher than the degree of crystallinity of the sheath of the core/sheath binding fibers.

2. The textile fabric according to claim 1 , wherein the binding component comprises a deformed fiber structure up to a completely fused continuous phase.

3. The textile fabric according to claim 1 , wherein after thermal storage at 160° ° C. for 1 week, the fabric exhibits a percentage reduction in a maximum tensile force in at least one direction of less than 5%, and/or an increase in the maximum tensile force in at least one direction of at least 1%.

4. The textile fabric according to claim 1 , wherein the PEN, copolymers of PEN, and/or blends thereof in the binding fiber sheath polymer have a cold crystallization temperature in a range of 70 to 200° C.

5. The textile fabric according to claim 1 , wherein the PEN, copolymers of PEN, and/or blends thereof in the binding fiber sheath polymer and/or in the binding component have a melting temperature in a range of 180 to 320° C.

6. The textile fabric according to claim 1 , wherein a ratio between the binding fiber core polymer and the binding fiber sheath polymer is from 90:10 to 10:90 (core:sheath weight ratio in wt. %).

7. The textile fabric according to claim 1 ,
wherein the matrix fibers comprise core/sheath matrix fibers comprising a matrix fiber sheath polymer and a matrix fiber core polymer.

8. The textile fabric according to claim 7 , wherein the matrix fiber sheath polymer is selected from same type of polymers, copolymers, and/or blends as the binding fiber sheath polymer, and/or
wherein the matrix fiber core polymer is selected from same type of polymers, copolymers, and/or blends as the binding fiber core polymer.

9. The textile fabric according to claim 1 , wherein a total of a proportion of PEN, copolymers of PEN, and/or blends thereof and a proportion of polyethylene terephthalate and/or co-polyethylene terephthalate is more than 80 wt. % based on a total weight of the base body.

10. The textile fabric according to claim 1 , wherein a proportion of the PEN, copolymers of PEN, and/or blends thereof is 5 to 95 wt. % based on a total weight of the fabric.

11. A method of using the textile fabric according to claim 1 for production of electrical insulating materials, comprising:
providing the textile fabric as carrier material for conductive strips and/or as layer separator for phase separation.

12. A method for producing the textile fabric according to claim 1 , comprising the following method steps:
providing core/sheath binding fibers in which the sheath comprises PEN, copolymers of PEN, and/or blends thereof;
forming a layer containing the core/sheath binding fibers;
applying temperature to the layer, the temperature being above a cold crystallization temperature of the binding fiber sheath polymer so as to obtain the textile fabric.

13. The textile fabric according to claim 1 , wherein the non-zero degree of crystallinity is up to 70%.

14. The textile fabric according to claim 13 , wherein the non-zero degree of crystallinity is up to 60%.

15. The textile fabric according to claim 3 , wherein the percentage reduction in the maximum tensile force in at least one direction is from of 0 to 4%, and/or the increase in the maximum tensile force in at least one direction is from 5 to 100%.

16. The textile fabric according to claim 4 , wherein the cold crystallization temperature is in a range of 80 to 190° C.

17. The textile fabric according to claim 1 , wherein the binding fiber sheath polymer contains at least one homopolymer of PEN.

18. The textile fabric according to claim 1 , wherein the glass transition temperature of the binding fiber sheath polymer is higher by at least 5° C. than a glass transition temperature of a binding fiber core polymer.

Assignees

• Freudenberg Carl Kg

Inventors

• Schneider Ulrich
• Jarre Gerald
• Zaplatilek Michael
• Jaeger Andrea

Classifications

• D04H1/5418

  Mixed fibres, e.g. at least two chemically different fibres or fibre blends · CPC title

• D04H1/5412

  sheath-core · CPC title

• D04H3/147

  Composite yarns or filaments · CPC title

• D04H3/011

  Polyesters · CPC title

• D04H1/60

  the bonding agent being applied in dry state, e.g. thermo-activatable agents in solid or molten state, and heat being applied subsequently · CPC title