Water-soluble resin for printing
AssigneeKao Corporation
InventorsRyo Shibutani, Gota Katayanagi, Tadanori Yoshimura, Akihiro Onoue, Takahiro Noro, Keiji Sasaki
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Abstract
The water-soluble resin for printing of the present invention includes a monomer unit A having a sulfonate group; and a monomer unit B having no hydrophilic group, and a percentage of the monomer unit A based on a total of all monomer units is 5 to 35 mol %. According to the water-soluble resin for printing of the present invention, a printed matter from which a printing layer can be safely and efficiently removed with neutral water and which is excellent in water resistance can be realized.
Claims18
A method for removing a printing layer, the method comprising:
- treating a printed matter comprising a water-soluble printing layer with neutral water at 30° C. or more to remove the water-soluble printing layer,
- wherein the water-soluble printing layer comprises a water-soluble resin for printing comprising:
- a monomer unit A having a sulfonate group;
- and
- a monomer unit B derived from a monomer having no hydrophilic groups other than groups that constitute polymerization in producing the water-soluble resin,
- wherein a percentage of the monomer unit A based on a total of all monomer units is 5 to 35 mol %.
A method for removing a printing layer, the method comprising:
- treating a printed matter with neutral water at 30° C. or more to remove a water-soluble printing primer layer and the printing layer,
- wherein the printed matter comprises, in sequence:
- a substrate;
- the water-soluble printing primer layer containing a water-soluble resin for printing;
- and
- the printing layer, and
- wherein the water-soluble resin comprises:
- a monomer unit A having a sulfonate group;
- and
- a monomer unit B derived from a monomer having no hydrophilic groups other than groups that constitute polymerization in producing the water-soluble resin,
- wherein a percentage of the monomer unit A based on a total of all monomer units is 5 to 35 mol %.
Dependencies are inferred from the claim text.