Polyamide 6 resins containing a low level of polyamide 66 comonomer

Patent metadata

Field	Value
Publication number	US-2018030271-A1
Application number	US-201715650407-A
Country	US
Kind code	A1
Filing date	Jul 14, 2017
Priority date	Jul 28, 2016
Publication date	Feb 1, 2018
Grant date	—

Abstract

Compositions of polyamide resins containing a low level of polyamide 66 comonomer are provided, which are useful in producing blown films. A method of forming a blown film includes: extruding a polyamide copolymer to form a polyamide film. The polyamide copolymer is formed from a mixture of caprolactam and hexamethylenediamine adipate where the caprolactam comprises from 85 mol. % to 99 mol. % of the total moles of caprolactam and hexamethylenediamine adipate.

First claim

1 . A method of forming a blown film, the method comprising:
extruding a polyamide copolymer to form a polyamide film, wherein the polyamide copolymer is formed from a mixture of caprolactam and hexamethylenediamine adipate, wherein the caprolactam comprises from 85 mol. % to 99 mol. % of the total moles of caprolactam and hexamethylenediamine adipate.

2 . The method of claim 1 , wherein the caprolactam comprises from 90 mol. % to 99 mol. % of the total moles of caprolactam and hexamethylenediamine adipate.

3 . The method of claim 1 , wherein the caprolactam comprises from 92 mol. % to 96 mol. % of the total moles of caprolactam and hexamethylenediamine adipate.

4 . The method of claim 1 , wherein the mixture of caprolactam and hexamethylenediamine adipate further comprises water.

5 . The method of claim 1 , where the polyamide copolymer is formed by polymerizing the mixture of caprolactam and hexamethylenediamine adipate in a continuous polymerization train.

6 . The method of claim 1 , further comprising:
extruding a polyethylene polymer to form a polyethylene film, and combining the polyamide film and polyethylene film to form a multilayer film.

7 . The method of claim 1 , where extruding the polyamide copolymer includes forming a bubble in the extruded polyamide copolymer by injecting air through an injection port and gathering the extruded polyamide copolymer with one or more rollers into the polyamide film.

8 . The method of claim 1 , wherein the polyamide copolymer has a crystallization temperature of 140° C. to 160° C.

9 . The method of claim 1 , wherein the polyamide copolymer has a melt point of 190° C. to 210° C.

10 . The method of claim 1 , wherein the polyamide copolymer has an isothermal crystallization time of 1.25 min to 12 min at 170° C.

11 . The method of claim 1 , wherein the polyamide copolymer has an isothermal crystallization time of 1.0 min to 14 min at 170° C.

12 . The method of claim 1 , wherein the polyamide copolymer has a degree of randomness of 0.95 to 1.1.

13 . The method of claim 1 , wherein the polyamide copolymer has a puncture resistance of 55 in-lb f to 95 in-lb f .

14 . A blown film comprising a polyamide layer, the polyamide layer comprising a polyamide copolymer formed from a mixture of caprolactam and hexamethylenediamine adipate, wherein the caprolactam comprises from 85 mol. % to 99 mol. % of the total moles of caprolactam and hexamethylenediamine adipate.

15 . The blown film of claim 14 , wherein the caprolactam comprises from 90 mol. % to 99 mol. % of the total moles of caprolactam and hexamethylenediamine adipate.

16 . The blown film of claim 14 , wherein the caprolactam comprises from 92 mol. % to 96 mol. % of the total moles of caprolactam and hexamethylenediamine adipate.

17 . The blown film of claim 14 , wherein the polyamide copolymer has a crystallization temperature of 140° C. to 170° C.

18 . The blown film of claim 14 , wherein the polyamide copolymer has a crystallization temperature of 140° C. to 160° C.

19 . The blown film of claim 14 , wherein the polyamide copolymer has a melt point of 190° C. to 210° C.

20 . The blown film of claim 14 , wherein the polyamide copolymer has an isothermal crystallization time of 1.25 min to 12 min at 170° C.

21 . The blown film of claim 14 , further comprising a polyethylene layer.

22 . The blown film of claim 14 , wherein the polyamide copolymer has a degree of randomness between 0.95 to 1.1.

23 . The blown film of claim 14 , wherein the polyamide copolymer has a puncture resistance of 55 in-lb f to 95 in-lb f .

24 . A polyamide copolymer formed from a mixture of caprolactam and hexamethylenediamine adipate, wherein the caprolactam comprises from 85 mol. % to 99 mol. % of the total moles of caprolactam and hexamethylenediamine adipate, and wherein the copolymer has a melt point of 190° C. to 205° C.

25 . The polyamide copolymer of claim 24 , wherein the copolymer has a degree of randomness of 0.95 to 1.1.

26 . The polyamide copolymer of claim 24 , wherein the copolymer has a residual wall thickness of 85% to 97%.

27 . The polyamide copolymer of claim 24 , wherein the copolymer has a puncture resistance of 55 in-lb f to 95 in-lb f .

Assignees

• Advansix Resins & Chemicals Llc

Inventors

• Park Kuil
• Porter Simon J
• Barthe Stephanie C
• Liu Haoyu
• Nelliappan Veera

Classifications

• B32B2553/00

  Packaging equipment or accessories not otherwise provided for · CPC title

• C08L77/06

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title

• B29C48/0018

  combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence) · CPC title

• B32B2307/548

  Creep · CPC title

• B32B27/306

  comprising vinyl acetate or vinyl alcohol (co)polymers · CPC title