A multilayer stretched film with barrier property that is free from deterioration of barrier properties attributable to dimensional change caused by moisture absorption, and bending, etc. A multilayer stretched film with barrier property obtained by biaxially stretching a multilayer laminate including at least three layers, namely, a polyester-based resin layer (Layer A), a polyamide-based resin layer (Layer B), and a polyester-based resin layer (Layer A), in this order (wherein the two Layers A may be the same or different) to obtain a biaxially stretched multilayer film; and providing a deposition layer (Layer C) on at least one surface of the biaxially stretched multilayer film; both of the Layers A containing a crystalline polyester; Layer B containing 70 to 99 wt % of aliphatic polyamide and 1 to 30 wt % of aromatic polyamide; and Layer C containing an inorganic substance.

Claims

9 · 1 independent · depth 4

9 granted claims

›1.independentA multilayer stretched film with barrier property obtained by biaxially stretching a multilayer laminate comprising at least three layers, namely, a p…+8

›2.↳ 1The multilayer stretched film with barrier property according to claim 1, wherein the total thickness of Layers A is 1 to 20 μm, the thickness of Laye…d2

›3.↳ 1The multilayer stretched film with barrier property according to claim 1, wherein the crystalline polyester contained in Layers A is at least one memb…d2

›4.↳ 1The multilayer stretched film with barrier property according to claim 1, wherein the aliphatic polyamide-based resin contained in Layer B is at least…d2

›5.↳ 1The multilayer stretched film with barrier property according to claim 1, wherein the aromatic polyamide-based resin contained in Layer B is polymetha…d2

›6.↳ 1The multilayer stretched film with barrier property according to claim 1, wherein the inorganic substance contained in Layer C is at least one member …d2

›7.↳ 1A packaging film obtained by laminating a sealing layer on the deposition layer of the multilayer stretched film with barrier property of claim 1.d2+2

Classifications

10 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B32B1/08
B29D23/00
B29D22/00

USPC · US Patent Classification

428/35.7428/35.9428/35.3428/35.2428/35.8428/475.2428/474.4

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Pendency

1.6 y

601 days filing → grant

Office actions

non-final + final

Responses

1 RCE

Examiner

Michael C Miggins

art unit 1782 · TC 1700

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Citations: 9 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20120040117 A1	16 Feb 2012

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