Siloxane resins
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United States of America Patent
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Issued Date -
Apr 3, 2003
app pub date -
Jul 26, 2001
filing date -
Jul 26, 2001
priority date (Note) -
Abandoned
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Abstract
This invention pertains to a siloxane resin composition comprising HSiO.sub.3/2 siloxane units, and (R.sup.2O).sub.bSiO.sub.(4-b)/2 siloxane units wherein R.sup.2 is independently selected from the group consisting of branched alkyl groups having 3 to 30 carbon atoms and substituted branched alkyl groups having 3 to 30 carbon atoms, b is from 1 to 3. The siloxane resin contains a molar ratio of HSiO.sub.3/2 units to (R.sup.2O).sub.bSiO.sub.(4-b)/2 units of 0.5:99.5 to 99.5. The siloxane resin is useful to make insoluble porous resins and insoluble porous coatings. Heating a substrate with the siloxane resin at a sufficient temperature effects removal of the R.sup.2O groups to form an insoluble porous coating having a porosity in a range of 1 to 40 volume percent and a modulus in the range of 4 to 80 GPa.
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