Multilayer film

Patent metadata

Field	Value
Publication number	US-11613617-B2
Application number	US-201113991098-A
Country	US
Kind code	B2
Filing date	Nov 30, 2011
Priority date	Dec 1, 2010
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

The invention provides a multilayer film comprising a substrate film and a coating layer arranged on at least one surface of the substrate film, wherein the coating layer contains an oxazoline group and comprises an acrylic resin, the coating layer has a thickness (D) of 5-150 nm, and the ratio (Pl/P2) of the peak intensity (P1) of a peak that has an absorption maximum in a region of 1655±10 cm−1 to the peak intensity (P2) of a peak that has an absorption maximum in a range of 1580±10 cm−1 in the total reflection infrared absorption spectrum of the coating layer and the thickness (D) of the coating layer fulfill the relationship represented by the formula: 0.03≤(Pl/P2)/D≤0.15.

First claim

The invention claimed is:

1. A multilayer film obtained by forming a crosslinked coating layer on at least one face of a polyester substrate film, wherein
said coating layer is formed from a resin composition comprising an oxazoline group-containing resin, an acrylic resin, and optionally a urethane resin, and has a thickness (D) of 10 to 150 nm,
a relation of the thickness (D) of the coating layer with a ratio (P1/P2) of a peak-intensity (P1) of the peak having an absorption maximum in a region of 1655±10 cm −1 and a peak-intensity (P2) of the peak having an absorption maximum in a region of 1580±10 cm −1 in a total reflection infrared absorption spectrum of the coating layer satisfies an equation of a formula 0.035≤(P1/P2)/D≤0.104,
the oxazoline group-containing resin is present in an amount of 30 to 50% by mass, the acrylic resin is present in an amount of 30 to 50% by mass, and the urethane resin is present in an amount of 0 to 20% by mass based on 100% by mass in total of said oxazoline group-containing resin, said acrylic resin, and said urethane resin,
the oxazoline group-containing resin is a copolymer of 2-isopropenyl-2-oxazoline, methyl (meth)acrylate, and one or more unsaturated monomers comprising a polyethylene glycol chain,
a composition mole ratio of 2-isopropenyl-2-oxazoline is 30 to 70 mol % in the oxazoline group-containing resin,
the polyethylene glycol chain has a molecular weight of 300 g/mol to 700 g/mol,
the acrylic resin comprises a carboxyl group and 40-95 mol % of alkyl (meth)acrylate and has an acid value of 1 to 4 mgKOH/g,
the alkyl group in the alkyl (meth)acrylate of the acrylic resin is selected from methyl and ethyl,
the urethane resin comprises a carboxyl group and has an acid value of 20 to 30 mgKOH/g, and
the urethane resin is produced by reaction of a polyhydroxy compound comprising dimethylolpropionic acid and a polyisocyanate compound comprising alicyclic diisocyanate.

2. The multilayer film according to claim 1 , wherein an inorganic thin film layer is laminated on said coating layer.

3. The multilayer film according to claim 1 , wherein
an inorganic thin film layer is laminated on said coating layer,
a protection layer is further laminated on the inorganic thin film layer, and
said protection layer is formed from a resin composition A comprising a polymer (a) of either a (meth)acrylic acid homopolymer or a (meth)acrylic acid/(meth)acrylic acid ester copolymer containing not less than 10% by mass of (meth)acrylic acid; a polyurethane-urea resin (b) having an ether bond; and at least one crosslinking agent (c) selected from epoxy resins, polyisocyanates, and silane coupling agents.

4. The multilayer film according to claim 1 , wherein
an inorganic thin film layer is laminated on said coating layer,
a protection layer is further laminated on the inorganic thin film layer, and
said protection layer is formed from a resin composition B comprising a polymer (d) having a weight-average molecular weight of 22,000 to 40,000 and a polyisocyanate (e).

5. The multilayer film according to claim 1 , wherein the oxazoline group-containing resin in said resin composition has an amount of the oxazoline group of 4.3 to 8.0 mmol/g.

6. The multilayer film according to claim 1 , wherein said resin composition comprises the urethane resin.

7. The multilayer film according to claim 2 , wherein said inorganic thin film layer is a layer consisting of a composite oxide of silicon oxide and aluminum oxide.

8. The multilayer film according to claim 3 , wherein the oxazoline group-containing resin in said resin composition has an amount of the oxazoline group of 4.3 to 8.0 mmol/g.

9. The multilayer film according to claim 8 , wherein said resin composition comprises the urethane resin.

10. The multilayer film according to claim 8 , wherein said inorganic thin film layer is a layer consisting of a composite oxide of silicon oxide and aluminum oxide.

11. The multilayer film according to claim 1 , wherein the coating layer has a thickness (D) of 50 to 150 nm.

Assignees

• Yamazaki Atsushi
• Inagaki Kyoko
• Ookawa Takeshi
• Morihara Yoshiharu
• Takatsu Youji
• Kobayashi Masanori
• Toyo Boseki

Inventors

• Yamazaki Atsushi
• Inagaki Kyoko
• Ookawa Takeshi
• Morihara Yoshiharu
• Takatsu Youji
• Kobayashi Masanori

Classifications

• B32B27/40

  comprising polyurethanes · CPC title

• C08J7/048 Primary

  Forming gas barrier coatings · CPC title

• B32B9/00

  Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00 · CPC title

• Y10T428/265

  1 mil or less · CPC title

• C08J7/043

  Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50) · CPC title