Multilayer film, laminate, airbag, and method of manufacturing laminate

Patent metadata

Field	Value
Publication number	US-10953639-B2
Application number	US-201916707413-A
Country	US
Kind code	B2
Filing date	Dec 9, 2019
Priority date	Jun 16, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A multilayer film, which is used upon being adhered to a fabric, includes an adhesive layer to be a side of the multilayer film to be adhered to the fabric; and a barrier layer bonded to the adhesive layer. Each of the adhesive layer and the barrier layer includes a thermoplastic polyester elastomer. A melting point of the barrier layer is higher than a melting point of the adhesive layer. A ratio value of a content ratio of a soft segment in the thermoplastic polyester elastomer in the adhesive layer with respect to a content ratio of a soft segment in the thermoplastic polyester elastomer in the barrier layer, is 5 or less.

First claim

What is claimed is:

1. An airbag comprising:
a fabric formed to have a shape of a bag; and
a multilayer film including
an adhesive layer adhered to the fabric; and
a barrier layer bonded to the adhesive layer, wherein

each of the adhesive layer and the barrier layer includes a thermoplastic polyester elastomer,
a melting point of the barrier layer is equal to or greater than 180° C., and is higher than a melting point of the adhesive layer by at least 20° C., and
a ratio value of a content ratio in wt % of a soft segment in the thermoplastic polyester elastomer in the adhesive layer with respect to a content ratio in wt % of a soft segment in the thermoplastic polyester elastomer in the barrier layer, is 5 or less.

2. The airbag according to claim 1 , wherein the ratio value of the content ratio in wt % of the sot segment in the thermoplastic polyester elastomer in the adhesive layer with respect to the content ratio in wt % of the soft segment in the thermoplastic polyester elastomer in the barrier layer, is 1.2 to 5.

3. The airbag according to claim 1 , wherein an aromatic polyester included in a hard segment in the thermoplastic polyester elastomer included in the adhesive layer, includes an aromatic polyester included in a hard segment in the thermoplastic polyester elastomer included in the barrier layer.

4. The airbag according to claim 3 , wherein the aromatic polyester includes a polybutylene terephthalate.

5. The airbag according to claim 1 , wherein a polyether included in a soft segment in the thermoplastic polyester elastomer included in the adhesive layer, includes a polyether included in a soft segment in the thermoplastic polyester elastomer included in the barrier layer.

6. The airbag according to claim 1 , wherein a content ratio in wt % of a soft segment in the thermoplastic polyester elastomer included in the adhesive layer is 50% by weight to 90% by weight with respect to 100% by weight of the thermoplastic polyester elastomer included in the adhesive layer.

7. The airbag according to claim 1 , wherein
the adhesive layer includes a first adhesive layer and a second adhesive layer, and
either the first adhesive layer or the second adhesive layer includes a pigment.

8. The airbag according to claim 1 , wherein the fabric includes polyester.

9. The airbag according to claim 1 , wherein the multilayer film is formed by simultaneously extruding and molding the adhesive layer with the barrier layer.

Assignees

• Nitto Denko Corp
• Nitto Switzerland Ag

Inventors

• Yamada Yosuke
• Tagami Toru
• Ludwig Michael

Classifications

• C09J2467/006

  in the substrate · CPC title

• C09J2467/00

  Presence of polyester · CPC title

• C09J2203/354

  for automotive applications · CPC title

• C09J7/30

  characterised by the adhesive composition · CPC title

• C09J7/255

  Polyesters · CPC title