Patent EP0616001B1 successfully refreshed from Google Patents.
EP0616001B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for stabilization of hydrogen silsesquioxane resin solutions
Assignee: DuPont Toray Specialty Materials KK
•
Filing: 1994-03-15
•
Granted: 1997-05-14
•
Expires: 2014-03-15
Abstract
No abstract record available.
Inventors
- 👤 Dennis William Broderick
- 👤 James Anthony Helwick
- 👤 Takashi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 17:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08G; C08G77/00; C08G77/04; C08G77/12; C08K3/00; C08K3/18; C08K3/24; C09; C09D; C09D183/00; C09D183/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
A method of stabilising a hydrogen silsesquioxane resin solution comprising 0.1 to 100 parts by weight hydrogen silsesquioxane resin in 100 parts by weight solvent characterised in that 0.002 to 4 parts by weight acid are added to said resin solution.
Claim 2
Dependent Claim
25 words
A method according to claim 1 wherein at least 75% of the polymeric species of the resin have a weight average molecular weight above 1200.
Claim 3
Dependent Claim
27 words
A method according to claim 2 wherein at least 75% of the polymeric species of the resin have a weight average molecular weight between 1200 and 50,000.
Claim 4
Independent Claim
26 words
A method according any of claims 1 to 3, wherein the solvent is selected from alcohols, aromatic hydrocarbons, alkanes, ketones, esters, glycol ethers and cyclic dimethylpolysiloxanes.
Claim 5
Independent Claim
28 words
A method according to any of claims 1 to 4, wherein the acid is selected from boric, carbonic, hydrochloric, iodic, nitric, nitrous, phosphoric, phosphorous, sulfuric and sulfurous acids.
Claim 6
Independent Claim
36 words
A method according to any of claims 1 to 4, wherein the acid is selected from acetic, benzoic, butyric, citric, formic, lactic, maleic, naphthoic, oxalic, phthalic, picric, propionic, succinic, tartaric, toluic, toluene sulfonic and trifluoroacetic acids.
Claim 7
Independent Claim
25 words
A method according to any of claims 1 to 6, wherein the acid is added in an amount between 0.01 to 0.1 parts by weight.
Claim 8
Independent Claim
73 words
A method according to any of claims 1 to 7, wherein the resin solution further comprises modifying ceramic oxide precursors comprising a compound containing an element selected from titanium, zirconium, aluminum, tantalum, vanadium, niobium, boron and phosphorous wherein the compound contains at least one hydrolyzable substituent selected from alkoxy or acyloxy and the compound is present in an amount such that the coating contains 0.1 to 30 percent by weight modifying ceramic oxide.
Claim 9
Independent Claim
43 words
A method according to any of claims 1 to 7, wherein the resin solution further comprises a platinum, rhodium or copper catalyst in an amount of between 5 to 1000 ppm platinum, rhodium or copper based on the weight of hydrogen silsesquioxane resin.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.