Polyamide-imide block copolymers, preparation method thereof and polyamide-imide film comprising the same

Patent metadata

Field	Value
Publication number	US-12522729-B2
Application number	US-202017432886-A
Country	US
Kind code	B2
Filing date	Apr 9, 2020
Priority date	Apr 9, 2019
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

The polyamide-imide block copolymer according to the present invention makes it possible to provide a polyamide-imide film having excellent thermal stability and chemical resistance and, at the same time, having excellent mechanical properties.

First claim

What is claimed is:

1 . A polyamide-imide block copolymer comprising: a first repeat unit represented by the following Chemical Formula 1, a second repeat unit represented by the following Chemical Formula 2 and a third repeat unit represented by the following Chemical Formula 3:

wherein, in the Chemical Formulae 1 to 3,
each A is the same as or different from each other in each repeat unit, and is a substituted or unsubstituted tetravalent organic group,
E 1 , E 2 , E 3 , E 4 , E 5 , E 6 and E 7 are the same as or different from each other in each repeat unit, and are a single bond or —NH—,
each Z 1 is the same as or different from each other in each repeat unit, and is a trivalent organic group derived from at least one compound selected from the group consisting of triacyl halide, triamine and tricarboxylic acid,
each Z 2 is the same as or different from each other in each repeat unit, and is a divalent organic group derived from at least one compound selected from the group consisting of diacyl halide, diamine and dicarboxylic acid, and
Y 1 , Y 2 , and Y 3 are the same as or different from each other in each repeat unit, and each independently, a divalent aromatic organic group having 6 to 30 carbon atoms, wherein the divalent aromatic organic group exists alone; or two or more aromatic organic groups are bonded to each other to form a divalent condensed ring; or two or more aromatic organic groups are linked by a single bond, a fluorenylene group, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p , where 1≤p≤10, —(CF 2 ) q , where 1≤q≤10, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, or —C(═O)NH—, with the proviso that at least one of Y 1 , Y 2 and Y 3 is substituted with one or more photocurable functional groups selected from the group consisting of a (meth)acrylate group and a functional group represented by the following Chemical Formula 4,

each R 1 is the same as or different from each other in each repeat unit, and is hydrogen or an alkyl group having 1 to 10 carbon atoms, and each L is the same as or different from each other in each repeat unit, and is a single bond or an alkylene having 1 to 10 carbon atoms,
wherein the sum of the repeat units in which Y 1 , Y 2 and Y 3 are substituted with the photocurable functional group is 20 mol % to 50 mol % based on 100 moles of the total repeat units, and
wherein a weight average molecular weight is 5,000 to 300,000 g/mol.

2 . The polyamide-imide block copolymer according to claim 1 ,
wherein each of the Y 1 , Y 2 and Y 3 is a group represented by the following Chemical Formula Y-1 or Y-2:

wherein, in the Chemical Formula Y-1 and Chemical Formula Y-2,
R 3 are each independently a (meth)acrylate group or a functional group represented by the following Chemical Formula 4,

each R 1 is the same as or different from each other in each repeat unit, and is hydrogen or an alkyl group having 1 to 10 carbon atoms, each L is the same as or different from each other in each repeat unit, and is a single bond or an alkylene having 1 to 10 carbon atoms,
n3, n4 and n5 are each independently 0 to 4, with the proviso that at least one of n3, n4 and n5 is 1 or more, and
each R 4 is independently a single bond, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p , where 1≤p≤10, —(CF 2 ) q , where 1≤q≤10), —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, or —C(═O)NH—.

3 . The polyamide-imide block copolymer according to claim 1 , wherein A is any one selected from groups represented by the following:

4 . The polyamide-imide block copolymer according to claim 1 ,
wherein the Z 1 is any one selected from groups represented by the following:

5 . The polyamide-imide block copolymer according to claim 1 ,
wherein the Z 2 is any one selected from groups represented by the following:

6 . The polyamide-imide block copolymer according to claim 1 ,
wherein the first repeat unit includes a repeat unit represented by Chemical Formula 1-1:

wherein, in the Chemical Formula 1-1,
Y 1 is as defined in claim 1 .

7 . The polyamide-imide block copolymer according to claim 1 ,
wherein the second repeat unit includes a repeat unit represented by Chemical Formula 2-1:

wherein, in the Chemical Formula 2-1,
Y 2 is as defined in claim 1 .

8 . The polyamide-imide block copolymer according to claim 1 ,
wherein the third repeat unit includes a repeat unit represented by Chemical Formula 3-1:

wherein, in the Chemical Formula 3-1,
Y 3 is as defined in claim 1 .

9 . The polyamide-imide block copolymer according to claim 1 ,
wherein a molar ratio of the sum of the second repeat unit and the third repeat unit is 10:90 to 90:10 relative to the first repeat unit.

10 . A polyamide-imide film comprising the polyamide-imide block copolymer according to claim 1 .

11 . The polyamide-imide film according to claim 10 ,
wherein a yellowness index (Y.I.) according to ASTM D1925 is 1.5 to 1.75.

12 . The polyamide-imide film according to claim 10 ,
wherein a modulus according to ASTM D648 is 4.0 GPa to 5.0 GPa.

Assignees

• Lg Chemical Ltd

Inventors

• Park Gieun
• Lim Jae Gu
• Lim Yoon Bin
• Lee Tae Seob
• Lim Seung Joon
• Kim Se Jeong
• Kim Woo Han

Classifications

• C08L2203/16

  used for films · CPC title

• C08L2201/08

  Stabilised against heat, light or radiation or oxydation · CPC title

• C08G73/14 Primary

  Polyamide-imides · CPC title

• C08G73/124

  the unsaturated precursors containing oxygen in the form of ether bonds in the main chain · CPC title

• C08G73/1067

  Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound · CPC title