Synthesis of fluorosilicon polymers

A modified process for producing fluorosilicon polymers reduces manufacturing costs by minimizing gel formation and shortening equilibrium time, making them suitable for low-to-medium-performance release coatings.

JP2026523121APending Publication Date: 2026-07-13DOW SILICONES CORP +1
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Patent Information

Application Number
JP2025564210
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-05-10
Publication Date
2026-07-13

AI Technical Summary

Technical Problem

Current processes for producing fluorosilicon (F-Si) polymers used in low-to-medium-performance release coatings are costly due to long equilibrium times and gel formation, which hinders reactant mixing and increases manufacturing costs.

Method used

A modified process involving the combination of octamethylcyclotetrasiloxane, polydimethylsiloxane, tetrakis(vinyldimethylsiloxy)silane, potassium silanolate siloxane, and optionally trifluoropropylmethylcyclotrisiloxane, with polydimethylaminophosphazenium hydroxide, where trifluoropropylmethylcyclotrisiloxane is added dropwise, and the reaction is maintained at specific temperatures to minimize gel formation and reduce equilibrium time.

Benefits of technology

The process reduces the number of steps, minimizes gel formation, and significantly shortens the equilibrium time, resulting in a more cost-effective production of F-Si polymers suitable for low-to-medium-performance applications.

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Abstract

The process for preparing a fluorosilicone polymer includes: (a) mixing octamethylcyclotetrasiloxane, polydimethylsiloxane, tetrakis(vinyldimethylsiloxy)silane, potassium silanolate siloxane, and optionally trifluoropropylmethylcyclotrisiloxane; (b) adding polydimethylaminophosphazenium hydroxide to the mixture to form a reaction mixture and heating the reaction mixture to a temperature in the range of 140-150°C; (c) if trifluoropropylmethylcyclotrisiloxane was not added in step (a), adding trifluoropropylmethylcyclotrisiloxane dropwise to the reaction mixture while the reaction mixture is at a temperature in the range of 110-150°C; (d) maintaining the reaction mixture at a temperature in the range of 140-150°C for an equilibrium period of 1-4 hours when the viscosity of the reaction mixture increases and after the viscosity of the reaction mixture has stabilized; stopping the reaction by adding a neutralizing agent, and then stripping off volatile substances to obtain the product.
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