US5516867A
Expired / Lapsed
US
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Modified hydrogen silsesquioxane resin
Assignee: Dow Silicones Corp
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Filing: 1995-05-12
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Granted: 1996-05-14
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Expires: 2015-05-12
Abstract
Abstract Disclosed is a novel resin of the structure (HSiO 1 .5) x (R 1 R 2 R 3 SiO 0 .5) y , wherein R 1 , R 2 , and R 3 are independently selected from hydrogen, alkyls and aryls, x is 0.25 to 0.99, y is 0.01 to 0.75 and x+y=1.0. Also disclosed is a method for making these resins.
Inventors
- 👤 Gregg A. Zank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:45
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/10; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C08G77/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
120 words
A method for modifying hydrogen silsesquioxane resin comprising: refluxing a mixture comprising 1 part by weight hydrogen silsesquioxane resin of the structure HSi(OH) x (X) y O z/2 , in which each X is a hydrolyzable substituent, x=0-2, y=0-2, z=1-3, x+y+z=3, between 0.1 and 10 parts by weight of an endcapping agent of the structure (R 1 R 2 R 3 Si) 2 O, wherein R 1 , R 2 , and R 3 are independently selected from hydrogen, alkyls, alkenyls or aryls, between 0.0001 and 0.05 parts by weight of an acid and between 0.01 and 0.5 parts by weight water, for a time sufficient to modify the hydrogen silsesquioxane resin; cooling the reaction mixture; and recovering the resin.
Claim 2
Independent Claim
120 words
A method for modifying hydrogen silsesquioxane resin comprising: refluxing a mixture comprising 1 part by weight hydrogen silsesquioxane resin of the structure HSi(OH) x (X) y O z/2 , in which each X is a hydrolyzable substituent, x=0-2, y=0-2, z=1-3, x+y+z=3, between 0.1 and 10 parts by weight of an endcapping agent of the structure (R 1 R 2 R 3 Si) 2 O, wherein R 1 , R 2 , and R 3 are independently selected from hydrogen, alkyls, alkenyls or aryls, between 0.0001 and 0.05 parts by weight of an acid and between 0.01 and 0.5 parts by weight water, for a time sufficient to modify the hydrogen silsesquioxane resin; cooling the reaction mixture; and recovering the resin.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein X is selected from the group consisting of Cl and alkoxy.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein R 1 , R 2 , and R 3 are independently selected from the group consisting of hydrogen and methyl.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the endcapping agent is selected from the group consisting of tetramethyldisiloxane and hexamethyldisiloxane.
Claim 6
Dependent Claim
43 words
The method of claim 1 wherein the hydrogen silsesquioxane resin is diluted in a solvent selected from the group consisting of aromatic hydrocarbons, alkanes, ketones, esters, ethers and volatile polysiloxanes at a concentration in the range of between 0.1 and 50 weight %.
Claim 7
Dependent Claim
11 words
The method of claim 1 wherein the acid is trifluoroacetic acid.
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein the mixture is refluxed for between 1 and 24 hours.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein the mixture is refluxed at a temperature between 20° and 150° C.
Claim 10
Dependent Claim
52 words
Modified hydrogen silsesquioxane resin of the structure (HSiO 1 .5) x (R 1 R 2 R 3 SiO 0 .5) y , wherein R 1 , R 2 , and R 3 are independently selected from hydrogen, alkyls or aryls, x is 0.25 to 0.99, y is 0.01 to 0.75 and x+y=1.0.
Claim 11
Dependent Claim
52 words
Modified hydrogen silsesquioxane resin of the structure (HSiO 1 .5) x (R 1 R 2 R 3 SiO 0 .5) y , wherein R 1 , R 2 , and R 3 are independently selected from hydrogen, alkyls or aryls, x is 0.25 to 0.99, y is 0.01 to 0.75 and x+y=1.0.
Claim 12
Dependent Claim
37 words
The modified hydrogen silsesquioxane resin of claim 9 wherein R 1 , R 2 , and R 3 are independently selected from hydrogen or methyl, x is 0.5 to 0.99, y is 0.01 to 0.5 and x+y=1.0.
Claim 13
Dependent Claim
35 words
The modified hydrogen silsesquioxane resin of claim 9 having the structure (HSiO 1 .5) x (Me 2 HSiO 0 .5) y , wherein x is 0.5 to 0.99, y is 0.01 to 0.5 and x+y=1.0.
Claim 14
Dependent Claim
21 words
The modified hydrogen silsesquioxane resin of claim 9 having an Mn in the range of between about 500 and about 2500.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-14 | 1999-11-13 | 2000-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-14 | 2003-11-13 | 2004-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-14 | 2007-11-13 | 2008-05-14 | $7700.00 | Window Closed / Lapsed |