Organopolysiloxane Composition for Low-Platinum Curing on Poisoned Substrates
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Solution Overview
Problem
Conventional organopolysiloxane compositions require high amounts of platinum group metal catalysts, which are costly and prone to catalyst poisoning, and struggle to form effective cured films on substrates like plastic film and glassine paper.
Innovation Solution
A curable organopolysiloxane composition containing specific organopolysiloxane components with trivinylsiloxane units and (meth)acrylic groups, along with a reduced platinum concentration, facilitates addition reactions on substrates with catalyst poisons, forming films with comparable release force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of platinum group metal catalyst is reduced, then production cost is reduced, but curability and release force deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters of the organopolysiloxane components, specifically incorporating trivinylsiloxane units and controlling vinyl group content within 0.001 to 0.7 mol/100 g, to optimize the curing reaction efficiency and maintain performance with reduced catalyst
Solution Approach 2:
The patent creates a composite system by combining specific organopolysiloxane components (A) with controlled vinyl content, organohydrogenpolysiloxane components (B), and trace platinum catalyst, where the synergistic interaction enables effective curing at 1 to 100 ppm catalyst levels
2Quantity of substance
If the amount of platinum group metal catalyst is reduced, then production cost is reduced, but susceptibility to catalyst poisoning increases
Solution Approach 1:
The patent optimizes the vinyl group content parameter within a specific range (0.001 to 0.7 mol/100 g) to balance reaction efficiency and catalyst protection, ensuring sufficient curing while minimizing catalyst consumption and exposure to poisons
Solution Approach 2:
The patent accepts that some catalyst deactivation may occur due to poisoning, but compensates by using the minimum necessary catalyst amount (1 to 100 ppm) to achieve the required curing performance, effectively treating the catalyst as a consumable additive rather than a recoverable component
3Reliability
If conventional organopolysiloxane composition is used, then curability is maintained, but application to plastic film substrates and glassine paper is insufficient
Solution Approach 1:
The patent adjusts the vinyl group content parameter and incorporates specific structural features (trivinylsiloxane units) in the organopolysiloxane to optimize adhesion to low-energy surfaces like plastic films and glassine paper while maintaining curability
Solution Approach 2:
The patent develops a composite formulation combining organopolysiloxane (A), organohydrogenpolysiloxane (B), and optional adhesion promoters or modifiers to create a composition that adheres to diverse substrates including plastic films and glassine paper where conventional compositions fail
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
Reduces platinum usage while maintaining curability and adhesiveness, enabling effective film formation on substrates where conventional compositions fail.
Implementation Method 1
a platinum group metal-based catalyst (D)
Data Source
AI summary
The present invention provides a curable organopolysiloxane composition which is capable of undergoing an addition reaction with a small amount of a platinum group metal catalyst and has curability equivalent to those of conventional ones, the curable organopolysiloxane composition being also capable of forming a cured film having a peel strength equivalent to those of conventional ones especially for release paper and release films, and in which curing by an addition reaction proceeds even if a base material contains a catalyst poison component. The curable organopolysiloxane composition contains: (A) an organopolysiloxane which has two or more silicon atom-bonded alkenyl groups in each molecule, but does not have three or more (meth)acrylic groups in each molecule; (B) an organohydrogen polysiloxane which has two or more silicon atom-bonded hydrogen atoms on average in each molecule, but does not have three or more (meth)acrylic groups; (C) a compound which is other than an organopolysiloxane among compounds having one or more (meth)acrylic groups in each molecule, and has a molecular weight of 72 to 1,000, and the like; and (D) a platinum group metal catalyst.