Solvent-free-adhesive polyisocyanate composition, solvent-free adhesive, and method for producing multilayer film using the same

Patent metadata

Field	Value
Publication number	US-10960642-B2
Application number	US-201815903825-A
Country	US
Kind code	B2
Filing date	Feb 23, 2018
Priority date	Nov 26, 2015
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

Provided is a solvent-free-adhesive polyisocyanate composition, containing, a polyisocyanate (A) and an aromatic vinyl-maleic anhydride copolymer (B), which is a copolymer of aromatic vinyl and maleic anhydride in which a molar ratio [aromatic vinyl/maleic anhydride] of the raw material monomers of the copolymer is 1.5/1 to 5/1. Further provided is a method for producing the polyisocyanate composition; a solvent-free adhesive containing, the solvent-free-adhesive polyisocyanate composition and a polyol (Y); and a multilayer film obtained by laminating a first base material film, a second base material film, and an adhesive layer between the base material films, in which the adhesive layer is formed of the solvent-free adhesive.

First claim

What is claimed is:

1. A solvent-free adhesive comprising a solvent-free-adhesive polyisocyanate composition, and a polyol (Y),
wherein the solvent-free-adhesive polyisocyanate composition comprises a polyisocyanate (A) and an aromatic vinyl-maleic anhydride copolymer (B),
the polyisocyanate (A) is a reaction product of a polyol component and a polyisocyanate comprising one or more selected from the group consisting of 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, toluene diisocyanate, m-xylene diisocyanate, carbodiimide-modified 4,4′-methylenebisphenyl diisocyanate, hexamethylene diisocyanate allophanate, isophorone diisocyanate, hexanemethylene diisocyanurate, and isocyanurate of isophorone diisocyanate,
the polyol (Y) is a polyester polyol,
the copolymer is of an aromatic vinyl and a maleic anhydride, and the copolymer has a molar ratio [aromatic vinyl/maleic anhydride] of raw material monomers of 2/1 to 3/1,
the aromatic vinyl-maleic anhydride copolymer (B) is a styrene-maleic anhydride copolymer, and
the solvent-free adhesive polyisocyanate composition is essentially free of propylene carbonate.

2. A multilayer film obtained by laminating a first base material film, a second base material film, and an adhesive layer between the base material films,
wherein the adhesive layer is formed of the solvent-free adhesive according to claim 1 .

3. The multilayer film according to claim 2 , wherein the base material films each comprise an aluminum, silica, or alumina layer, or are each a metal film.

4. A package obtained by forming a bag from a multilayer film obtained by laminating a first plastic film, a second plastic film, and an adhesive layer between the plastic films,
wherein the adhesive layer is formed of the solvent-free adhesive according to claim 1 .

5. The package according to claim 4 , wherein the first plastic film and the second plastic film each comprise an aluminum, silica, or alumina layer, or are each a metal film.

6. A method for producing a solvent-free adhesive, the solvent-free adhesive comprising a solvent-free-adhesive polyisocyanate composition and a polyol (Y), the method comprising:
preparing a solvent-free-adhesive polyisocyanate composition comprising a polyisocyanate (A) and an aromatic vinyl-maleic anhydride copolymer (B); and
mixing the solvent-free-adhesive polyisocyanate composition with the polyol (Y) component,
wherein the polyisocyanate (A) is a reaction product of a polyol component and a polyisocyanate comprising one or more selected from the group consisting of 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, toluene diisocyanate, m-xylene diisocyanate, carbodiimide-modified 4,4′-methylenebisphenyl diisocyanate, hexamethylene diisocyanate allophanate, isophorone diisocyanate, hexanemethylene diisocyanurate, and isocyanurate of isophorone diisocyanate,
the polyol (Y) is a polyester polyol,
the copolymer is of an aromatic vinyl and a maleic anhydride, and the copolymer has a molar ratio [aromatic vinyl/maleic anhydride] of raw material monomers of 2/1 to 3/1,
the aromatic vinyl-maleic anhydride copolymer (B) is a styrene-maleic anhydride copolymer, and
the solvent-free adhesive polyisocyanate composition is essentially free of propylene carbonate.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Ohara Shinichi
• UMETSU Kiyokazu
• Kimura Ryoji
• Okubo Tomoo
• Shimamura Kenichi
• NAKANE Kohei

Classifications

• C08G18/758

  containing two or more cycloaliphatic rings · CPC title

• B32B7/12 Primary

  using interposed adhesives or interposed materials with bonding properties · CPC title

• C08G18/62

  Polymers of compounds having carbon-to-carbon double bonds · CPC title

• C09J125/02

  Homopolymers or copolymers of hydrocarbons · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title