Injection moldable silicone composition

US11453149B2 · kind B2 · utility

Assignee

• Dow Silicones Corporation · US

Inventors

• Michelle Cummings · Midland, US
• Stanton Dent · Midland, US
• Joel P. McDonald · Midland, US
• Jacob William Steinbrecher · Midland, US
• Michael R. Strong · Midland, US
• Bradley W. Tuft · Midland, US
• Clinton Whiteley · Wichita, US

Key dates

• Filing date: Aug 6, 2018
• Grant date: Sep 27, 2022
• Expiry date: Sep 7, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/54
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An injection moldable composition, comprising: A) a silicone resin (I) [R13SiO1/2]a[R2R3SiO2/2]b[SiO4/2]c, wherein R1, R2, and R3 are hydrocarbyl, hydrocarbyloxy, or hydroxyl, at least one of R2 or R3 is alkenyl, subscripts a, b, and c are each >0 and a+b+c=1, B) 0 to 90% (w/w), based on the weight of A) and B), of a silicone resin (II) [R43SiO1/2]d[SiO4/2]e wherein R4 is hydrocarbyl, hydrocarbyloxy, or hydroxyl, at least one of R4 is alkenyl, subscripts d and e are each >0, and d+e=1, C) a siloxane polymer having formula (III), [R53SiO1/2]fR6R7SiO2/2]g. wherein R5-7 are hydrocarbyl or hydroxyl, at least one of R5-7 is alkenyl, subscripts f and g are each >0, and f+g=1, D) a silicone crosslinker having at least two silicon-bonded hydrogen atoms per molecule, and E) a hydrosilylation catalyst, wherein the ratio of silicon-bonded hydrogen atoms to carbon-carbon double bonds is from 1.2 to 2.2.