Positive Lithographic Printing Plate Precursor Heat Resistance

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Solution Overview

Problem

Existing positive type planographic printing plates face issues with chemical resistance and printing durability, particularly when subjected to burning treatments, as polymers like urea and urethane degrade under heat, leading to compromised performance.

Innovation Solution

A positive type planographic printing plate precursor is developed, featuring a support with an image recording layer containing a phenol compound with a phenolic hydroxyl group, a polymer with urea or urethane bonds, and an infrared absorbent, which undergoes light exposure, development, and heat treatment to enhance chemical resistance and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a urea polymer or urethane polymer is used as a binder resin to achieve excellent printing durability, then printing durability is improved, but the polymer decomposes due to heat during burning treatment and chemical resistance deteriorates

Engineering Contradiction:

Improveprinting durabilityVSAvoidchemical resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a composite binder system combining novolac resin (phenolic resin) with urea polymer or urethane polymer. This composite structure allows the phenolic resin to provide heat resistance and chemical stability during burning treatment, while the urea/urethane polymer contributes to printing durability. The synergistic combination resolves the contradiction by having each component compensate for the other's weaknesses.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the molecular structure and properties of the binder resin by using specific phenolic resins with controlled molecular weight and incorporating crosslinking agents. This changes the thermal and chemical parameters of the binder to withstand burning treatment temperatures while maintaining printing durability. The parameter modification allows the binder to resist decomposition at elevated temperatures.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If a novolac resin is used as a main binder to improve chemical resistance through burning treatment, then chemical resistance is improved, but printing durability deteriorates

Engineering Contradiction:

Improvechemical resistanceVSAvoidprinting durability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent reverses the conventional approach by making the urea polymer or urethane polymer the primary binder (5-50 wt%) and adding phenolic resin (45-95 wt%) as a complementary component. This inverted composite structure ensures that the urea/urethane polymer provides printing durability while the phenolic resin contributes to chemical resistance and heat stability, resolving the contradiction through balanced composition.

Inventive Principle:

Principle #40Composite materials

3Reliability

If burning treatment is performed to improve printing durability, then printing durability is improved, but the polymer decomposes due to heat and chemical resistance deteriorates

Engineering Contradiction:

Improveprinting durabilityVSAvoidchemical resistance

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent employs a composite binder system where phenolic resin provides thermal stability and chemical resistance during burning treatment, while urea polymer or urethane polymer maintains printing durability. The composite structure allows the system to withstand heat treatment without decomposition while preserving both printing durability and chemical resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the thermal and chemical parameters of the binder resin composition by selecting specific phenolic resins with appropriate molecular weights and incorporating crosslinking agents. This parameter modification enables the binder to maintain structural integrity at burning treatment temperatures (100-300°C) while preserving printing durability and chemical resistance.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides improved chemical resistance and printing durability before and after burning treatments, maintaining performance through three-dimensional crosslinking and increased polarity of the image recording layer.

Implementation Method 1

an infrared absorbent... which absorbs light and generates heat

Methodology Applied

Scientific EffectInfrared absorption: Absorption (EM radiation)

Implementation Method 2

maintaining performance through three-dimensional crosslinking and increased polarity of the image recording layer

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Data Source

PatentEP3410210B1Positive lithographic printing master plate and method for manufacturing lithographic printing plate

Publication Date: 2020.10.21 FUJIFILM CORP

AI summary

Provided is a positive type planographic printing plate precursor including: a support; and an image recording layer provided on the support, in which the image recording layer contains: a phenol compound containing a phenolic hydroxyl group and a substituent represented by -CH2OR in a molecule thereof, and having a molecular weight of from 200 to 2.000; a polymer having any one or both of a urea bond and a urethane bond in a main chain thereof; and an infrared absorbent.