EP0493879A2
Expired / Lapsed
EP
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Hydrogen silsesquioxane resin fractions and their use as coating materials
Assignee: Dow Silicones Corp
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Filing: 1991-11-13
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Granted: —
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Expires: 2011-11-13
Abstract
Abstract The present invention relates to hydrogen silsesquioxane resin (H-resin) fractions derived from an extraction process using one or more fluids at, near or above their critical state. These fractions can comprise narrow molecular weight fractions with a dispersity less than about 3.0 or fractions useful for applying coatings on substrates. The invention also relates to a method of using these fractions for forming ceramic coatings on substrates.
Inventors
- 👤 Larry Frazier Hanneman
- 👤 Theresa Eileen Gentle
- 👤 Kenneth George Sharp
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 14:55
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/692; H10P14/6921; H10P14/6922; H10P14/6925; C; C04; C04B; C04B41/00; C04B41/45; C04B41/4505; C04B41/455; C04B41/4554; C08; C08G; C08G77/00; C08G77/04; C08G77/12; C09; C09D; C09D183/00; C09D183/04; H10W; H10W99/00; H10P14/63; H10P14/6326; H10P14/6342
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
11 words
Hydrogen silsesquioxane resin having a dispersity of less than about 3.0.
Claim 2
Dependent Claim
19 words
Hydrogen silsesquioxane resin wherein about 90% of the polymeric species have a molecular weight between about 500 and 10,000.
Claim 3
Dependent Claim
122 words
The resin according to claim 2 dissolved in one or more solvents selected from the group consisting of alcohols, aromatic hydrocarbons, alkanes, ketones, cyclic dimethylpolysiloxanes, esters or glycol ethers and is present in an amount sufficient to dissolve the hydrogen silsesquioxane fraction to between about 0.1 and about 50 weight percent and which also contains a modifying ceramic oxide precursor comprising a compound containing an element selected from the group consisting of titanium, zirconium, aluminum, tantalum, vanadium, niobium, boron and phosphorous wherein the compound contains at least one hydrolyzable substituent selected from the group consisting of alkoxy or acyloxy and the compound is present in an amount such that the ceramic coating contains 0.1 to 30 percent by weight modifying ceramic oxide.
Claim 4
Dependent Claim
32 words
The solution according to claim 3 which also contains a platinum or rhodium catalyst in an amount of about 5 to about 500 ppm platinum based on the weight of the fraction.
Claim 5
Independent Claim
75 words
A method of forming a ceramic coating on a substrate comprising: coating the substrate with a solution comprising a solvent and hydrogen silsesquioxane resin with a number average molecular weight between about 700 and about 6000 and a dispersity of less than about 3.0; evaporating the solvent to deposit a preceramic coating on the substrate; and subjecting the preceramic coating to a temperature sufficient to facilitate conversion of the preceramic coating to a ceramic coating.
References Cited (Backward Citations)
No citation records indexed.
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