Method and device for producing foamed body

Patent metadata

Field	Value
Publication number	US-11827004-B2
Application number	US-202117188989-A
Country	US
Kind code	B2
Filing date	Mar 1, 2021
Priority date	Mar 23, 2020
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

A method for producing a foamed body includes: forming a foamed layer precursor including applying a coating liquid onto a base to form a liquid film and applying an ink onto the liquid film by an inkjet method, where the coating liquid contains a foaming agent and an active energy ray curable material having a radical-polymerizable functional group, the active energy ray curable material contains a multifunctional active energy ray curable material having two or more radical-polymerizable functional groups, and the ink contains a foaming accelerator having a radical-polymerizable functional group; and foaming a desired position of the foamed layer precursor by heating to form a foamed layer. A functional group equivalent of the radical-polymerizable functional group in the foaming accelerator is greater than a functional group equivalent of the radical-polymerizable functional group in the active energy ray curable material.

First claim

The invention claimed is:

1. A method for producing a foamed body, the method comprising:
forming a foamed layer precursor, including:
applying a coating liquid onto a base to form a liquid film, the coating liquid containing a foaming agent and an active energy ray curable material having a radical-polymerizable functional group, the active energy ray curable material containing a multifunctional active energy ray curable material having two or more radical-polymerizable functional groups; and
applying an ink onto the liquid film by an inkjet method, the ink containing a foaming accelerator having a radical-polymerizable functional group; and

foaming a desired position of the foamed layer precursor by heating to form a foamed layer.

2. A method for producing a foamed body, the method comprising:
forming a foamed layer precursor, including:
applying a coating liquid onto a base to form a liquid film, the coating liquid containing a foaming agent and a multifunctional active energy ray curable material having two or more radical-polymerizable functional groups;
applying an ink onto the liquid film by an inkjet method, the ink containing a monofunctional foaming accelerator having one radical-polymerizable functional group; and
curing the liquid film and the ink with active energy rays;

forming an image, including:
applying another ink onto the foamed layer precursor to form an ink layer, said another ink containing an active energy ray curable material and a colorant; and
curing the ink layer with active energy rays; and

foaming a desired position of the foamed layer precursor by heating to form a foamed layer.

3. The method according to claim 1 , wherein the foaming agent is a thermally expansible microcapsule.

4. The method according to claim 1 , wherein a content of the multifunctional monomer in the coating liquid is 40% by mass or more but 90% by mass or less.

Assignees

• Ricoh Co Ltd

Inventors

• Fujiwara Yukio
• Usui Yuuma

Classifications

• B32B5/20 Primary

  foamed in situ · CPC title

• B41F31/28

  Spray apparatus · CPC title

• B41J2/01

  Ink jet · CPC title

• B41M5/5227

  characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants · CPC title

• B41M5/5254

  characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers · CPC title