Siloxane resins

US6596404B1 · kind B1 · utility

Assignee

• Dow Corning Corporation · US

Inventors

• John Albaugh · Freeland, US
• Ronald Boisvert · Midland, US
• Duane Raymond Bujalski · Auburn, US
• Pierre Chevalier · Paris, FR
• Russell Keith King · Midland, US
• Duan Li Ou · Hackettstown, US
• Kai Su · Rutherford, US
• Katsuya Eguchi · Kyoto, JP

Key dates

• Filing date: Apr 15, 2002
• Grant date: Jul 22, 2003
• Expiry date: Apr 15, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31663
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention pertains to a siloxane resin composition comprising R1SiO3/2 siloxane units, R2SiO3/2 siloxane units and (R3O)bSiO(4-b)/2 siloxane units wherein R1 is an alkyl group having 1 to 5 carbons, hydrogen, or mixtures thereof; R2 is a monovalent organic group having 6 to 30 carbons; R3 is a branched alkyl group having 3 to 30 carbons, b is from 1 to 3; and the siloxane resin contains from 2.5 to 85 mole percent R1SiO3/2 units, 2.5 to 50 mole percent R2SiO3/2 units and 5 to 95 mole percent (R3O)bSiO(4-b)/2 units. The siloxane resin is useful to make insoluble porous resin and insoluble porous coatings. Heating a substrate coated with the siloxane resin at a sufficient temperature effects removal of the R2 and R3O groups to form an insoluble insoluble porous coating having a porosity of 1 to 60 volume percent and a dielectric constant in the range of 1.5 to 3.0.