Patent US4990376A successfully refreshed from Google Patents.
US4990376A
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Flexible silicone coatings for plastic substrates and methods for making thermoformable, abrasion-resistant thermoplastic articles
Assignee: SABIC Global Technologies BV
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Filing: 1989-11-24
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Granted: 1991-02-05
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Expires: 2009-11-24
Abstract
Abstract An improved silica-containing curable coating composition is described herein. The composition has an alkaline pH and contains a dialkyldialkoxysilane/alkyltrialkoxysilane mixture and a dispersion of ammonium-stabilized colloidal silica having an average particle size no greater than about 5-10 millimicrons. Methods for preparing such compositions are also disclosed, as are thermoplastic articles which include the cured protective coatings.
Inventors
- 👤 Gautam A. Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:39
CPC Classifications
C; C09; C09D; C09D4/00; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/0423; C09D183/00; C09D183/04; C08J2369/00; C08J2433/00; C08J2433/04; C08J2433/06; C08J2433/10; C08J2433/12; C08J2483/00; C08J2483/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A method for coating polycarbonate substrates with a silica-containing coating, which comprises: (A) applying to the substrate a curable silicone resin coating composition having a pH between about 7.1 and 7.8 and comprising a water/organic solvent dispersion of colloidal silica in a water/organic solvent dispersion of ammonium-stabilized colloidal silica having an average particle diameter no greater than about 5 to 10 millimicrons and a partial condensate of a mixture of a diorganodiorganooxysilane and an organotriorganooxysilane in a weight ratio in the range of about 1:99 to 15:85, wherein the diorganodiorganooxysilane has the formula R' 2 Si(OR) 2 and the organotriorganooxysilane has the formula R'Si(OR) 3 , each R being independently selected from the group consisting of alkyl groups containing about 1-8 carbon atoms and aromatic groups containing about 6-20 carbon atoms, each R' being independently selected from the group consisting of alkyl groups containing about 1-3 carbon atoms and aromatic groups containing about 6-13 carbon atoms; and (B) curing the composition at a temperature of about 100° C. to 130° C. in the presence of an effective amount of a curing catalyst.
Claim 2
Independent Claim
182 words
A method for coating polycarbonate substrates with a silica-containing coating, which comprises: (A) applying to the substrate a curable silicone resin coating composition having a pH between about 7.1 and 7.8 and comprising a water/organic solvent dispersion of colloidal silica in a water/organic solvent dispersion of ammonium-stabilized colloidal silica having an average particle diameter no greater than about 5 to 10 millimicrons and a partial condensate of a mixture of a diorganodiorganooxysilane and an organotriorganooxysilane in a weight ratio in the range of about 1:99 to 15:85, wherein the diorganodiorganooxysilane has the formula R' 2 Si(OR) 2 and the organotriorganooxysilane has the formula R'Si(OR) 3 , each R being independently selected from the group consisting of alkyl groups containing about 1-8 carbon atoms and aromatic groups containing about 6-20 carbon atoms, each R' being independently selected from the group consisting of alkyl groups containing about 1-3 carbon atoms and aromatic groups containing about 6-13 carbon atoms; and (B) curing the composition at a temperature of about 100° C. to 130° C. in the presence of an effective amount of a curing catalyst.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the curing catalyst is tetra-n-butylammonium acetate.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein the organic solvent is selected from the group consisting of isopropanol, methanol, propanol, ethanol, isobutanol, n-butanol, ethylene glycol monobutyl ether, ethylene glycol monobutyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monoethyl ether, and mixtures thereof.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein the silicone resin coating composition applied to the substrate further includes a silylated ultraviolet light absorbing agent which is capable of co-reacting with either or both of the silanes.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein an acrylic primer is applied and cured on the substrate prior to application of the silicone resin coating composition.
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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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |