Organopolysiloxane composition for release paper or release film

By adding organic peroxide to the organopolysiloxane composition and optimizing the molar ratio of Si-H group and alkenyl groups, the problems of high amount of platinum group metal-based catalysts and difficulty in curing reactions in the prior art are solved, and a high-efficiency and low-cost release paper or release film process is achieved.

CN115279862BActive Publication Date: 2025-03-18SHIN ETSU CHEMICAL CO LTD
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Patent Information

Application Number
CN202180021359.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-03-16
Filing Date
2021-03-15
Publication Date
2025-03-18
Estimated Expiration
2041-03-15

AI Technical Summary

Technical Problem

The prior art requires a higher amount of platinum group metal catalyst in the process of peeling paper or peeling film, and when the components that hinder catalytic activity are contained, the curing reaction is difficult to proceed, resulting in high cost and insufficient peeling force.

Method used

By adding an appropriate amount of organic peroxide to the organopolysiloxane composition, the amount of platinum group metal-based catalyst is reduced, while optimizing the molar ratio of Si-H group and alkenyl group, improving the reaction speed and curability.

Benefits of technology

The addition reaction is carried out at a smaller amount of platinum group metal catalyst, forming a cured coating with the same peeling force, reducing manufacturing costs, and effectively curing on a substrate containing catalyst poison.

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Abstract

An organopolysiloxane composition for release paper or release film, comprising (A) an organopolysiloxane having two or more silicon-bonded alkenyl groups in one molecule, (B) an organohydrogenpolysiloxane having an average of two or more silicon-bonded hydrogen atoms (Si-H groups) in one molecule, (C) an organic peroxide, and a specific amount of (D) a platinum group metal catalyst. The composition can undergo an addition reaction with a smaller amount of the platinum group metal catalyst than in the past, and can form a cured film having the same release force as in the past, and can form a cured film using an addition reaction even on a substrate containing a catalyst poison component that could not be cured in the past.
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