US4990376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 08:03
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.
References Cited (Backward Citations)
US4027073A
Cited
US3986997A
Cited
US4159206A
Cited
US4500669A
Cited
US4436851A
Cited
US4308317A
Cited
US4368235A
Cited
US4478876A
Cited
US4419405A
Cited
US4436924A
Cited
US4477519A
Cited
US4525426A
Cited
US4544582A
Cited
US4555545A
Cited
US4624870A
Cited
US4680232A
Cited
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 |