Polyamide composition and film and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-11084262-B2
Application number	US-201816231695-A
Country	US
Kind code	B2
Filing date	Dec 24, 2018
Priority date	Apr 18, 2018
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A method of forming a film is provided, which includes providing a sheet from a polyamide composition; and biaxial stretching of the sheet to form a film, wherein the polyamide composition includes a blend of a first polyamide and a second polyamide. The first polyamide has a repeating unit ofand the second polyamide has repeating units ofThe second polyamide is a crystalline random copolymer. The sheet of the polyamide composition is biaxially stretched at a rate of 20 mm/sec to 100 mm/sec.

First claim

What is claimed is:

1. A polyamide composition for an easy-tear polyamide film, comprising:
a blend of a first polyamide and a second polyamide,
wherein the first polyamide has a repeating unit of

and the second polyamide has repeating units of

and the second polyamide is a crystalline random copolymer,
wherein the first polyamide and the second polyamide have a weight ratio of 90:10 to 70:30,
wherein the repeating units

of the second polyamide have a molar ratio of 65:35 to 55:45, and
wherein the polyamide film is considered easy-tear when a vertical distance between an ideal tear line and a tear location is equal to or less than 5 mm, wherein the tear location is laterally spaced 10 cm from an opening of the polyamide film and the ideal tear line is laterally extended from the opening and vertical to an edge of the polyamide film.

2. The polyamide composition as claimed in claim 1 , wherein the first polyamide and the second polyamide have a weight ratio of 85:15 to 75:25.

3. The polyamide composition as claimed in claim 1 , wherein the first polyamide has a relative viscosity of 2.5 to 4.0 at 25° C.

4. The polyamide composition as claimed in claim 1 , wherein the second polyamide has a relative viscosity of 1.01 to 2.5 at 25° C.

5. A film, comprising a polyamide composition including a blend of a first polyamide and a second polyamide,
wherein the first polyamide has a repeating unit of

and the second polyamide has repeating units of

and the second polyamide is a crystalline random copolymer,
wherein the first polyamide and the second polyamide have a weight ratio of 90:10 to 70:30,
wherein the repeating units

of the second polyamide have a molar ratio of 65:35 to 55:45,
wherein the film is an easy-tear polyamide film, and
wherein the polyamide film is considered easy-tear when a vertical distance between an ideal tear line and a tear location is equal to or less than 5 mm, wherein the tear location is laterally spaced 10 cm from an opening of the polyamide film and the ideal tear line is laterally extended from the opening and vertical to an edge of the polyamide film.

6. The film as claimed in claim 5 , being laminated to a polymer film, a metal foil, or a combination thereof to form a laminated film.

7. A method of forming the film as claimed in claim 5 , comprising:
providing a sheet from the polyamide composition; and
biaxial stretching of the sheet to form the film,
wherein the sheet of the polyamide composition is biaxially stretched at a rate of 20 mm/sec to 100 mm/sec.

8. The method as claimed in claim 7 , wherein the sheet from the polyamide composition is biaxially stretched at a rate of 20 mm/sec to 40 mm/sec.

Assignees

• Ind Tech Res Inst

Inventors

• Wu Jyh-Horng
• Leu Ming-Tsong
• Chang Sheng-Lung
• Liu Hung-Jen
• Shiao Po-Ling
• Li Yen-Cheng
• Chang Yih-Her

Classifications

• B32B27/08

  of synthetic resin · CPC title

• C08L77/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) · CPC title

• C08J2377/00

  Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers · CPC title

• B32B15/088

  comprising polyamides · CPC title

• B32B2307/554

  Wear resistance · CPC title