Curable Organopolysiloxane Release Agent for Thermal Paper
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Solution Overview
Problem
Conventional hydrosilylation reactive silicone-based releasing agents for thermally sensitive papers face issues with curing failures and reduced adhesion at low temperatures, leading to unclear printing and manufacturing inefficiencies, due to the limitations of platinum catalyst usage and the presence of nitrogen/sulfur compounds in the coloring layer.
Innovation Solution
A curable organopolysiloxane releasing agent composition incorporating alkenyl groups with specific carbon atom ranges, organohydrogen polysiloxanes, a hydrosilylation reaction catalyst, and a hydrosilylation reaction inhibiting agent, which can be cured at low temperatures without gellification, ensuring high adhesion and peeling force, and is suitable for industrial manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional hydrosilylation reactive silicone-based releasing agent is used with high temperature heating (100°C or more), then the releasing agent cures quickly, but the thermally sensitive coloring layer undergoes color development or discoloration making printing unclear
Solution Approach 1:
The patent modifies the chemical parameters of the releasing agent system by using alkenyl groups with 4-12 carbon atoms instead of conventional vinyl groups, and optimizes the Si-H to C=C molar ratio to 1.0-4.0. This parameter change enables the hydrosilylation reaction to proceed efficiently at lower temperatures (below 100°C) without causing color development or discoloration of the thermally sensitive coloring layer, while still achieving adequate curing speed and adhesion.
2Object-affected harmful factors
If low temperature (no more than 90°C) is used for hydrosilylation reaction to avoid color development, then color development is prevented, but the releasing layer undergoes degradation with curing failure and reduced adhesion
Solution Approach 1:
The patent changes the chemical structure parameters by using alkenyl groups with 4-12 carbon atoms (preferably hexenyl groups) instead of conventional vinyl groups, and optimizes the Si-H to C=C molar ratio to 1.0-4.0. These parameter changes enable the hydrosilylation reaction to proceed completely at low temperatures (70-100°C) without curing failure, achieving both prevention of color development and maintenance of adequate adhesion.
Solution Approach 2:
The patent creates a composite chemical system combining organopolysiloxane with alkenyl groups (4-12 carbon atoms) and organohydrogen polysiloxane in optimized ratios. This composite material system provides enhanced reactivity and curing performance at low temperatures, preventing both color development and curing failure simultaneously.
3Reliability
If reaction time is elongated to prevent curing failure at low temperature, then curing failure is prevented, but the cycle time during manufacturing becomes longer reducing manufacturing efficiency
Solution Approach 1:
The patent optimizes the chemical parameters by using alkenyl groups with 4-12 carbon atoms and setting the Si-H to C=C molar ratio between 1.0-4.0. This parameter optimization enables the hydrosilylation reaction to proceed rapidly and completely at low temperatures within a short time frame, preventing curing failure while maintaining short cycle times for high manufacturing efficiency.
4Speed
If the amount of hydrosilylation reaction catalyst (platinum) is increased to improve hydrosilylation reactivity, then reactivity is improved, but the pot life is shortened remarkably causing rapid gellification and reduced ease of handling
Solution Approach 1:
The patent changes the chemical parameters by using alkenyl groups with 4-12 carbon atoms instead of vinyl groups, and optimizes the Si-H to C=C molar ratio to 1.0-4.0. These parameter changes inherently improve hydrosilylation reactivity, allowing the use of lower catalyst concentrations while maintaining fast reaction rates. This extends the pot life and improves ease of handling during coating and curing operations.
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 composition enables the formation of a releasing layer with high adhesion and peeling force without curing failures, even at short curing times and low temperatures, maintaining industrial manufacturability and preventing color development or discoloration of the thermally sensitive coloring layer.
Implementation Method 1
a curable organopolysiloxane releasing agent composition for a thermally sensitive paper that includes: (A) one or more types of organopolysiloxanes having an alkenyl group with a number of carbon atoms between 4 and 12, where the inclusion proportion of the vinyl (CH2═CH—) within the alkenyl group is between 0.5 and 3.0 mass %; (B) an organohydrogen polysiloxane having at least two silicon-bonded hydrogen atoms (Si—H) in a single molecule; (C) a hydrosilylation reaction catalyst; and (D) a hydrosilylation reaction inhibiting agent
Data Source
AI summary
Provided is a curable organopolysiloxane releasing agent composition for a thermally sensitive paper wherein a releasing layer that has high adhesion and a good peeling force that is cured quickly at a low temperature without producing curing failures when coated on a thermally sensitive coloring layer, and that is resistant to gellification at room temperature, and that has superior ease of handling, can be formed. The curable organopolysiloxane releasing agent composition comprises: (A) one or more organopolysiloxanes having an alkenyl group with a number of carbon atoms between 4 and 12, where the inclusion proportion of vinyl (CH2═CH—) within the alkenyl group is between 0.5 and 3.0 mass %; (B) an organohydrogen polysiloxane having at least two silicon-bonded hydrogen atoms (Si—H) in a single molecule; (C) a hydrosilylation reaction catalyst; and (D) a hydrosilylation reaction inhibiting agent.