Polymer film comprising a copolyamide of a diamine, a dimer acid and a lactam

Patent metadata

Field	Value
Publication number	US-11149124-B2
Application number	US-201716332255-A
Country	US
Kind code	B2
Filing date	Sep 5, 2017
Priority date	Sep 14, 2016
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

The present invention relates to a polymer film (P), comprising at least one copolyamide, wherein the copolyamide has been prepared by polymerizing at least one lactam (A) and a monomer mixture (M). The present invention further relates to a process for producing the polymer film (P) and to the use of the polymer film (P) as packaging film.

First claim

The invention claimed is:

1. A polymer film, comprising: a copolyamide, which is prepared by polymerizing components:
(A) from 15% to 84% by weight of at least one lactam,
(B) from 16% to 85% by weight of a monomer mixture consisting of components:
(B1) a C 32 -C 40 dimer acid; and
(B2) a C 4 -C 12 diamine, and
(B3) optionally a C 4 -C 20 diacid;

wherein percentages by weight of the components (A) and (B) are based on a total weight of the components (A) and (B), and
if (B3) is not present in component (B), component (B) consists of 45 to 55 mol % of component (B1) and 45 to 55 mol % of component (B2), based in each case on the total molar amount of component (B), or
if (B3) is present in component (B), component (B) consists of 13 to 52.9 mol % of component (B1), 47 to 53 mol % of component (B2), and 0.1 to 13 mol % of component (B3), based in each case on the total molar amount of component (B);
wherein the copolyamide has a viscosity number in the range from 160 to 290 mL/g, determined in a 0.5% by weight solution of the copolyamide in a mixture of phenol/o-dichlorobenzene in a weight ratio of 1:1.

2. The polymer film according to claim 1 , wherein the component (A) is selected from the group consisting of 3-aminopropanolactam, 4-aminobutanolactam, 5-aminopentanolactam, 6-aminohexanolactam, 7-aminoheptanolactam, 8-aminooctanolactam, 9-aminononanolactam, 10-aminodecanolactam, 11-aminoundecanolactam and 12-aminododecanolactam.

3. The polymer film according to claim 1 , wherein the component (B) consists of from 45 to 55 mol % of the component (B1) and from 45 to 55 mol % of the component (B2), based on a total molar amount of the component (B).

4. The polymer film according to claim 1 , wherein the component (B2) is selected from the group consisting of tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, decamethylenediamine and dodecamethylenediamine.

5. The polymer film according to claim 1 , wherein the component (B1) is prepared from one or more unsaturated fatty acids selected from the group consisting of an unsaturated C 16 fatty acid, an unsaturated C 18 fatty acid, and an unsaturated C 20 fatty acid.

6. The polymer film according to claim 1 , wherein the copolyamide has a glass transition temperature ranging from 20 to 50° C.

7. The polymer film according to claim 1 , wherein the copolyamide has a melting temperature ranging from 150 to 210° C.

8. The polymer film according to claim 1 , comprising: a first layer comprising the copolyamide, and an additional layer,
wherein the additional layer comprises an additional polymer selected from the group consisting of a polyolefin, a poly(ethylene-vinyl alcohol), a poly(ethylene-vinyl acetate), a polyethylene terephthalate, a polyvinylidene chloride and a maleic anhydride-grafted polyolefin.

9. The polymer film according to claim 1 , produced in a casting process, in a blowing process, in a biaxially oriented polyamide film process, or in multifilm blowing process.

10. The polymer film according to claim 1 , wherein the polymer film has a thickness ranging from 0.1 μm to 1 mm.

11. The polymer film according to claim 1 , wherein the copolyamide is a random copolymer.

12. A process for producing the polymer film according to claim 1 , comprising:
preparing the copolyamide in a molten form in a first extruder,
extruding the copolyamide in the molten form out of the first extruder through a die to obtain a film of the copolyamide in the molten form, and
cooling the film of the copolyamide in the molten form, with solidification of the copolyamide to obtain the polymer film.

13. A packaging film, comprising the polymer film according to claim 1 .

Assignees

• Basf Se

Inventors

• Minkwitz Rolf
• Goetz Walter
• Reil Frank
• Richter Florian

Classifications

• C08G69/36 Primary

  derived from amino acids, polyamines and polycarboxylic acids · CPC title

• C08G69/34 Primary

  using polymerised unsaturated fatty acids · CPC title

• C08G69/14

  Lactams · CPC title

• C08J2377/04

  Polyamides derived from alpha-amino carboxylic acids (C08J2377/10 takes precedence) · CPC title

• C08L77/04

  Polyamides derived from alpha-amino carboxylic acids (C08L77/10 takes precedence) · CPC title