Method for manufacturing polymer film and co-extruded film

Patent metadata

Field	Value
Publication number	US-10000002-B2
Application number	US-201415107519-A
Country	US
Kind code	B2
Filing date	Dec 30, 2014
Priority date	Dec 31, 2013
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

The present invention relates to: a method for manufacturing a polymer film, the method including a base film forming step for co-extruding a first resin containing a polyamide-based resin and a second resin containing a copolymer including polyamide-based segments and polyether-based segments; a co-extruded film including a base film including a first resin layer containing a polyamide-based resin, and a second resin layer containing a copolymer having polyamide-based segments and polyether-based segments; to a co-extruded film including a base film including a first resin layer and a second resin layer, which have different melting points; and to a method for manufacturing a polymer film, the method including a base film forming step including a step of co-extruding a first resin and a second resin, which have different melting points.

First claim

The invention claimed is:

1. A co-extruded film for an inner liner: comprising a base film including a first resin layer containing a polyamide-based resin and a second resin layer containing a copolymer including polyamide-based segments and polyether-based segments
wherein the first resin layer further includes a copolymer including polyamide-based segments and polyether-based segments,
the second resin layer further includes a polyamide-based resin, and
the first resin layer includes more polyamide-based resin than the second resin layer, and
a difference between the content (wt %) of the polyamide-based resin in the first resin layer and the content (wt %) of the polyamide-based resin in the second resin layer is 5% to 85% by weight.

2. The co-extruded film according to claim 1 , wherein the base film has a multilayer structure of two or more layers including one or more first resin layers and one or more second resin layers.

3. The co-extruded film according to claim 1 , wherein the first resin layer includes 5% to 100% by weight of the polyamide-based resin, and
the second resin layer includes 0% to 95% by weight of the polyamide-based resin layer.

4. The co-extruded film according to claim 1 , wherein the total content of the polyether-based segments in the base film is 2% to 40% by weight.

5. The co-extruded film according to claim 1 , wherein the base film has a multilayer structure of two or more layers including the first resin layer and one or more types of the second resin layer including less polyamide-based resin than the first resin layer.

6. A co-extruded film for an inner liner comprising a base film containing a first resin layer and a second resin layer,
wherein the first resin layer includes 0% to 90% by weight of the polyamide-based resin and 10% to 100% by weight of the copolymer including polyamide-based segments and polyether-based segments and
the second resin layer includes 5% to 95% by weight of the polyamide-based resin and 5% to 95% by weight of the copolymer including polyamide-based segments and polyether-based segments, and
the first resin layer has a lower melt viscosity at a temperature of 240° C. to 270° C. compared to the second resin layer, and a difference in the melt viscosity between the first resin layer and the second resin layer is between 100 poise to 3,000 poise at a temperature of 240° C. to 270° C. and a shear rate of 500 s −1 .

7. The co-extruded film according to claim 6 , wherein the base film includes one or more first resin layers and one or more second resin layers.

8. The co-extruded film according to claim 6 , wherein the first resin layer has a melt viscosity of 600 poise to 6,000 poise at a temperature of 240° C. to 270° C. and a shear rate of 500 s −1 , and
the second resin layer has a melt viscosity of 700 poise to 9,000 poise at a temperature of 240° C. to 270° C. and a shear rate of 500 s −1 .

9. The co-extruded film according to claim 6 , wherein the total content of the polyether-based segments in the base film is 2% to 40% by weight.

Assignees

• Kolon Inc

Inventors

• Kim Yun-Jo
• Kim Si-Min
• Choi Dong-Hyeon
• Kim Dong-Jin

Classifications

• B32B2307/718

  Weight, e.g. weight per square meter · CPC title

• B29C48/07

  Flat, e.g. panels · CPC title

• B32B2274/00

  Thermoplastic elastomer material · CPC title

• B32B2307/552

  Fatigue strength · CPC title

• B32B3/00

  Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form · CPC title