Mirable-type silicone rubber composition and its cured product

JP7873938B2Active Publication Date: 2026-06-15SHIN ETSU CHEMICAL CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SHIN ETSU CHEMICAL CO LTD
Filing Date
2023-04-13
Publication Date
2026-06-15

AI Technical Summary

⚠Technical Problem

Existing silicone rubber compositions require secondary vulcanization to achieve low compression set, which is inefficient in terms of energy consumption, and primary vulcanization methods using sulfur-containing compounds can lead to vulcanization property deterioration or insufficient results.

⚗Method used

A millable-type silicone rubber composition comprising organopolysiloxane, surface-treated reinforcing silica, aliphatic alcohol, organohydrogenpolysiloxane, and a catalyst for hydrosilylation reaction, which allows for low compression set after primary vulcanization without secondary processing.

🎯Benefits of technology

The composition achieves a silicone rubber cured product with reduced compression set through primary vulcanization, suitable for applications like gaskets and packings, with improved mechanical properties and processability.

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Abstract

To provide a millable silicone rubber composition that yields a silicone rubber cured product with low compression set using only primary vulcanization.SOLUTION: A millable silicone rubber composition includes (A) an organopolysiloxane with a weight-average degree of polymerization of 1,000-100,000, including two or more alkenyl groups bonded to silicon atoms in one molecule, in an amount of 100 pts.mass, (B) surface-treated reinforcing silica with a BET-based specific surface area of 50 m2 / g or more in an amount of 10-100 pts.mass, (C) an open-chain aliphatic alcohol with a boiling point of 170°C or higher in an amount of 0.1-10 pts.mass, (D) an organohydrogenpolysiloxane including two or more hydrogen atoms (hydrosilyl groups) bonded to silicon atoms in one molecule, in such an amount that the molar ratio of hydrosilyl groups in component (D) to silicon atom-bonded alkenyl groups in component (A) is 0.5-10, and (E) a catalyst for hydrosilylation in a catalytic amount.SELECTED DRAWING: None
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