Composition, foamed silicone elastomer formed therefrom, and methods of formation

US11339266B2 · kind B2 · utility

Assignees

• Dow Silicones Corporation · US
• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Adam H. Broderick · Midland, US
• Douglas A. Brune · Midland, US
• Jarred Q. CRAMTON · Midland, US
• Mark Fisher · Midland, US
• Jody Henning · Midland, US
• Mark F. Sonnenschein · Midland, US
• Kai Su · Rutherford, US
• Benjamin L. Wendt · Midland, US

Key dates

• Filing date: Jul 30, 2019
• Grant date: May 24, 2022
• Expiry date: Jul 30, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2483/05
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A composition for forming a foamed silicone elastomer is disclosed. The composition comprises: A) an organopolysiloxane having at least two silicon-bonded ethylenically unsaturated groups per molecule; B) an organohydrogensiloxane having at least two silicon-bonded hydrogen atoms per molecule; C) a hydrosilylation catalyst; D) a chemical blowing agent; and E) a physical blowing agent. The hydrosilylation catalyst C) is present in a catalytically effective amount. The chemical blowing agent D) has at least one hydroxyl (OH) group, and is present in an amount to provide a OH content >0 and <500 parts per million (ppm). The physical blowing agent E) undergoes a phase change from a liquid to a gaseous state during exposure to atmospheric pressure and a temperature ≥0° C. The blowing agents D) and E) are different from one another. A foamed silicone elastomer, and methods of forming the composition and foamed silicone elastomer are also disclosed.