Self-adsorbable foamed laminate sheet and composition for self-adsorbable foamed sheet

Patent metadata

Field	Value
Publication number	US-11072729-B2
Application number	US-201816486156-A
Country	US
Kind code	B2
Filing date	Feb 16, 2018
Priority date	Feb 20, 2017
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Provided are a self-adsorbable foamed laminate sheet having excellent weather resistance and causing no paste residue, and a composition for a self-adsorbable foamed sheet used to obtain the self-adsorbable foamed laminate sheet. A composition for a self-adsorbable foamed sheet comprises: a copolymer containing an unsaturated carboxylic acid monomer unit and having a solubility parameter (SP value) of 9.7 (cal/cm3)1/2 or less and a glass-transition temperature of −10° C. or less; and a crosslinking agent.

First claim

The invention claimed is:

1. A self-adsorbable foamed sheet obtained by foaming and crosslinking a composition comprising: a copolymer containing an unsaturated carboxylic acid monomer unit and having a solubility parameter (SP value) of 9.7 (cal/cm 3 ) 1/2 or less and a glass-transition temperature of −10° C. or less; and
a crosslinking agent, wherein the crosslinking agent is a carbodiimide crosslinking agent, a content of the crosslinking agent with respect to 100 parts by mass of the copolymer is 1 part by mass or more and 20 parts by mass or less,
the copolymer further contains an alkenyl aromatic monomer unit, a conjugated diene monomer unit, and a (meth)acrylate monomer unit,
a content of the alkenyl aromatic monomer unit based on 100 mass % of the copolymer is 1 mass % or more and 5 mass % or less,
a content of the conjugated diene monomer unit based on 100 mass % of the copolymer is 56 mass % or more and 70 mass % or less,
a content of the unsaturated carboxylic acid monomer unit based on 100 mass % of the copolymer is 0.1 mass % or more and 2.5 mass % or less,
a content of the (meth)acrylate monomer unit based on 100 mass % of the copolymer is 40 mass % or more.

2. The self-adsorbable foamed sheet according to claim 1 , wherein the (meth)acrylate monomer unit is a (meth)acrylic acid alkyl ester monomer unit whose alkyl group has a carbon number of 1 or more and 14 or less.

3. The self-adsorbable foamed sheet according to claim 1 , wherein the composition has a viscosity of 1000 mPa·s or more and 10000 mPa·s or less.

4. A self-adsorbable foamed laminate sheet comprising:
a foamed layer composed of the self-adsorbable foamed sheet according to claim 1 ; and
a support layer composed of a substrate.

5. The self-adsorbable foamed laminate sheet according to claim 4 , wherein a density of the foamed layer is 0.1 g/cm 3 or more and 1.0 g/cm 3 or less.

6. The self-adsorbable foamed laminate sheet according to claim 4 , wherein a thickness of the foamed layer is 0.03 mm or more and 3 mm or less.

Assignees

• Zeon Corp

Inventors

• Tanaka Hidekazu
• Sone Atsushi
• Kobayashi Osamu

Classifications

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• B32B27/30

  comprising vinyl {(co)polymers; comprising acrylic (co)polymers} · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• C08J2333/06

  of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• C08J9/30

  by mixing gases into liquid compositions or plastisols, e.g. frothing with air · CPC title