Laminate

Patent metadata

Field	Value
Publication number	US-11097510-B2
Application number	US-201816650149-A
Country	US
Kind code	B2
Filing date	Oct 15, 2018
Priority date	Oct 17, 2017
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A laminate having an easy-to-adhere layer on at least one face of a resin substrate film, and having a heat seal layer on a face, of at least one of the easy-to-adhere layer(s), which is on a side opposite the resin substrate film, wherein the resin substrate film has a glass transition temperature of not less than 90° C.; the easy-to-adhere layer is formed from easy-to-adhere agent containing 100 parts by weight of acrylic polymer resin and 3-40 parts by weight of crosslinking agent; the acrylic polymer resin has methylol groups in an amount of 7-20 mol % of all monomer units that make up this polymer; the crosslinking agent is at least one crosslinking agent selected from oxazoline-type crosslinking agents and glycidylamine-type crosslinking agents; and the heat seal layer is a polyolefin-type heat seal layer with a thickness of less than 300 μm.

First claim

The invention claimed is:

1. A laminate having an easy-to-adhere layer on at least one face of a resin substrate film, and having a heat seal layer on a face, of at least one of the easy-to-adhere layer or layers, which is on a side opposite the resin substrate film therefrom, the laminate being such that
a glass transition temperature of a resin that forms the resin substrate film is not less than 90° C.;
the easy-to-adhere layer is formed from easy-to-adhere agent containing 100 parts by weight of acrylic polymer resin and 3-40 parts by weight of crosslinking agent;
the acrylic polymer resin has methylol groups present therein in an amount that is 7-20 mol % of all monomer units that make up this polymer;
the crosslinking agent is at least one crosslinking agent selected from among the group consisting of oxazoline-type crosslinking agent and glycidylamine-type crosslinking agent; and
the heat seal layer is a polyolefin-type heat seal layer, thickness of which is less than 300 μm.

2. The laminate according to claim 1 wherein the crosslinking agent is the oxazoline-type crosslinking agent, content of which is 10-40 parts by weight.

3. The laminate according to claim 1 wherein the crosslinking agent is the glycidylamine-type crosslinking agent, content of which is 3-35 parts by weight.

4. The laminate according to claim 3 wherein the easy-to-adhere agent further contains Compound A indicated by Formula (II);
wherein Formula (II) is given by

wherein n at Formula (II) is an integer that is 1-10;
wherein R 1 indicates the main chain in the molecular structure at Formula (II); furthermore, where a plurality of glycidyl groups are present within the molecular structure of Compound A, the longest chain that connects two glycidyl groups is taken to be the main chain;
wherein R 1 is a hydrocarbon group having 2-10 carbon atoms, the product of the number of carbon atoms at R 1 and n being 3-20; and
wherein R 2 and R 3 are each a hydrogen atom, hydroxy group, hydrocarbon group having 1-8 carbon atoms, or glycidyl ether group.

Assignees

• Toyobo Film Solutions Ltd
• Toyo Boseki

Inventors

• Yoshimura Tomoka
• Koganemaru Ai
• Tojo Mitsuo

Classifications

• B32B2262/0246

  Acrylic resin fibres · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• C09J133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• B32B27/36

  comprising polyesters · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title