US6184260B1
Expired / Lapsed
US
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Method for making nanoporous silicone resins from alkylhydridosiloxane resins
Assignee: Dow Silicones Corp
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Filing: 2000-06-16
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Granted: 2001-02-06
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Expires: 2020-06-16
Abstract
Abstract A method for preparing a nanoporous silicone resin which can be used to form low dielectric constant films useful for electrical insulating coatings on electronic devices comprising (A) contacting a hydridosilicon containing resin with a 1-alkene comprising about 8 to 28 carbon atoms in the presence of a platinum group metal-containing hydrosilation catalyst effecting formation of an alkylhydridosiloxane resin where at least 5 percent of silicon atoms are substituted with at least one group comprising about 8 to 28 carbon atoms and at least 45 percent of silicon atoms are substituted with at least one hydrogen atom and (B) heating the alkylhydridosiloxane resin of step (A) at a temperature sufficient to effect curing and thermolysis of alkyl groups comprising about 8 to 28 carbon atoms from the silicon atoms thereby forming a nanoporous silicone resin.
Inventors
- 👤 Bianxiao Zhong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/692; H10P14/6921; H10P14/6922; C09; C09D; C09D183/00; C09D183/04; H10P14/63; H10P14/6326; H10P14/6342; H10P14/66; H10P14/668; H10P14/6681; H10P14/6684; H10P14/6686; H10P14/665
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
A method for preparing a nanoporous silicone resin comprising the steps of (A) contacting a hydridosilicon containing resin with a 1-alkene comprising about 8 to 28 carbon atoms in the presence of a platinum group metal-containing hydrosilation catalyst effecting formation of an alkylhydridosiloxane resin where at least 5 percent of silicon atoms are substituted with at least one alkyl group comprising about 8 to 28 carbon atoms and at least 45 percent of silicon atoms are substituted with at least one hydrogen atom and (B) heating the alkylhydridosiloxane resin of step (A) at a temperature sufficient to effect thermolysis of alkyl substituents comprising about 8 to 28 carbon atoms of the alkylhydridosiloxane resin thereby forming a nanoporous silicone resin.
Claim 2
Independent Claim
119 words
A method for preparing a nanoporous silicone resin comprising the steps of (A) contacting a hydridosilicon containing resin with a 1-alkene comprising about 8 to 28 carbon atoms in the presence of a platinum group metal-containing hydrosilation catalyst effecting formation of an alkylhydridosiloxane resin where at least 5 percent of silicon atoms are substituted with at least one alkyl group comprising about 8 to 28 carbon atoms and at least 45 percent of silicon atoms are substituted with at least one hydrogen atom and (B) heating the alkylhydridosiloxane resin of step (A) at a temperature sufficient to effect thermolysis of alkyl substituents comprising about 8 to 28 carbon atoms of the alkylhydridosiloxane resin thereby forming a nanoporous silicone resin.
Claim 3
Dependent Claim
85 words
A method according to claim 1 where the hydridosilicon containing resin is selected from the group of hydridosiloxane resins described by formulas (HSiO 3/2 ) n , (H 2 SiO) m , and (HSiO 3/2 ) x (H 2 SiO) y , where n is within a range of about 100 to 1000, m is within a range of about 100 to 1000, x and y are each an integer of one or greater and x+y is within a range of about 100 to 1000.
Claim 4
Dependent Claim
31 words
A method according to claim 1 where the hydridosilicon containing resin is described by formula (HSiO 3/2 ) n , where n is within a range of about 100 to 1000.
Claim 5
Dependent Claim
21 words
A method according to claim 1 , where the 1-alkene is a branched 1-alkene comprising about 8 to 28 carbon atoms.
Claim 6
Dependent Claim
21 words
A method according to claim 1 , where the 1-alkene is selected from the group consisting of 1-dodecene, 1-ecicosene and 3,7,11,15-tetramethyl-1-hexadecen-3-ol.
Claim 7
Dependent Claim
32 words
A method according to claim 1 , where the mole ratio of the 1-alkene to silicon-bonded hydrogen atoms in the hydridosilicon containing resin is within a range of about 0.05:1 to 0.7:1.
Claim 8
Dependent Claim
32 words
A method according to claim 1 , where the mole ratio of the 1-alkene to silicon-bonded hydrogen atoms in the hydridosilicon containing resin is within a range of about 0.1 to 0.5:1.
Claim 9
Dependent Claim
53 words
A method according to claim 1 , where about 10 to 25 percent of the silicon atoms of the alkylhydridosiloxane resin are substituted with at least one alkyl group comprising about 8 to 28 carbon atoms and at least 70 percent of the silicon atoms are substituted with at least one hydrogen atom.
Claim 10
Dependent Claim
19 words
A method according to claim 1 , where the heating of step (B) is conducted in an inert atmosphere.
Claim 11
Dependent Claim
37 words
A method according to claim 1 , where the thermolysis of alkyl substituents comprising about 8 to 28 carbon atoms is conducted at a temperature within a range of greater than 350° C. to about 600° C.
Claim 12
Dependent Claim
34 words
A method according to claim 1 , where the thermolysis of alkyl substituents comprising about 8 to 28 carbon atoms is conducted at a temperature within a range of 400° C. to 550° C.
Claim 13
Dependent Claim
12 words
A nanoporous silicon resin prepared by the method of claim 1 .
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2004-02-06 | 2004-08-07 | 2005-02-06 | $2000.00 | Window Closed / Lapsed |
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