US 9,296,245 B2 · Printing form and process for preparing the printing form with curable composition having solvent-free epoxy resin

Abstract

The invention pertains to a printing form and a process for preparing the printing form from a solvent-free curable composition that includes, in prescribed relative amounts, an epoxy novolac resin; a bisphenol-A epoxy resin or a bisphenol-F epoxy resin; a monofunctional reactive diluent; a multifunctional reactive diluent; and a stoichiometric amount of an amine curing agent. The ratio of the epoxy novolac resin to the bisphenol epoxy resin is 1:3 to 3:1 by weight. The process includes applying the curable composition to a supporting substrate to form a layer, curing the layer at one or more temperatures in a temperature range, and engraving to form at least one cell in the cured layer. The process prepares printing forms, particularly gravure printing forms, having a cured resin composition layer that is engravable, resistant to solvent inks and to mechanical wear, and capable of printing gravure-quality images.

Claims8

Dependent claims

A printing form comprising a continuous print surface adjacent to a supporting substrate, wherein the continuous print surface is a cured epoxy composition prepared from a solvent-free curable composition comprising:

i) an epoxy novolac resin having a softening point less than 60° C.,
ii) a bisphenol-A epoxy resin or a bisphenol-F epoxy resin, having a softening point less than 60° C.,
iii) a monofunctional reactive diluent,
iv) a multifunctional reactive diluent, and
v) a stoichiometric amount of a multifunctional amine curing agent having an amine hydrogen equivalent weight less than 40 g/equivalent;
and
wherein i) and ii) together are at least 70 wt % of i), ii), iii), and iv) together;
the ratio of i) to ii) is 1:3 to 3:1 by weight;
and the ratio of iii) to iv) is 4:1 to 1:4 by weight.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/750,411Filed 25 Jun 2015 · division

Priority

21 Dec 2011

Published

US 2015/0290961 A115 Oct 2015

Granted

29 Mar 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

B41N 1/12
Printing plates or foils; Materials therefor: non-metallic other than stone , e.g. printing plates or foils comprising inorganic materials in an…
B32B 15/092
Of synthetic resin: comprising epoxy resins
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/38
Layered products comprising a layer of synthetic resin: comprising epoxy resins

Family

Application61/578,322Us provisional application · filed 21 Dec 2011

Application13/718,175Parent of this division · filed 18 Dec 2012

US 2015/0290961 A1Pre-grant publication · published 15 Oct 2015

US 9,096,759 B2Parent of this division

US 2013/0165549 A1Published application

US 9,296,245 B2This patent

From the US filing history. Foreign family members aren’t listed.

Printing form and process for preparing the printing form with curable composition having solvent-free epoxy resin

Life of this patent

Printing form and process for preparing the printing form with curable composition having solvent-free epoxy resin

Life of this patent

Abstract

Claims8