Patent US4477499A successfully refreshed from Google Patents.
US4477499A
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Thermoformable silicone resin coating composition and dual component coating system for polycarbonate
Assignee: General Electric Co
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Filing: 1982-09-07
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Granted: 1984-10-16
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Expires: 2002-09-07
Abstract
Abstract Ultraviolet radiation resistant silicone resin coating compositions are provided having improved thermoformability. Improved thermoformability and shortened required aging are achieved by the addition of a Lewis acid compound to the coating compositions is disclosed. Thermoformability is also improved by using the UV screen containing silicone resin coating composition in conjunction with extensible acrylate primers.
Inventors
- 👤 James E. Doin
- 👤 Howard A. Vaughn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:48
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C09; C09D; C09D183/00; C09D183/04; C08J7/043; C08J7/046; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/54; C08L; C08L83/00; C08L83/04; C08L83/10; C08L83/12; C08J2369/00; C08J2433/00; C08J2483/00; C08J2483/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
29 words
A thermoformable silicone resin coating composition comprising a colloidal silica filled thermoset organopolysiloxane containing a silylated ultraviolet radiation screening compound and a small amount of a Lewis acid compound.
Claim 2
Dependent Claim
29 words
A thermoformable silicone resin coating composition comprising a colloidal silica filled thermoset organopolysiloxane containing a silylated ultraviolet radiation screening compound and a small amount of a Lewis acid compound.
Claim 3
Dependent Claim
26 words
A composition as defined in claim 1, wherein said Lewis acid compound is selected from the group consisting of ferric chloride, aluminum chloride and zinc chloride.
Claim 4
Dependent Claim
15 words
A composition as defined in claim 2, wherein said Lewis acid compound is ferric chloride.
Claim 5
Dependent Claim
19 words
A composition as defined in claim 3 which contains sufficient ferric chloride to provide 10 to 30 ppm iron.
Claim 6
Dependent Claim
18 words
A composition as defined in claim 1 which also contains a small amount of a polysiloxane polyether copolymer.
Claim 7
Dependent Claim
67 words
A method for providing a thermoformable coating on polycarbonate substrates which comprises the steps: (A) applying to a polycarbonate substrate an extensible primer composition comprising from about 0.5 to about 10 parts by weight of a thermoplastic acrylic polymer in about 99.5 to about 90 parts by weight of a volatile solvent, and thereafter (B) applying a thermoformable silicone resin coating composition as defined in claim 1.
Claim 8
Dependent Claim
32 words
A method as defined in claim 6, wherein said volatile solvent is selected from the group consisting of ethyleneglycol diacetate, butoxyethanol, ethoxy ethanol, diacetone alcohol, hydroxyethyl acetate, cellosolve acetate, and combinations thereof.
Claim 9
Dependent Claim
14 words
A method as defined in claim 7, wherein said acrylic polymer is poly(ethyl methacrylate).
Claim 10
Dependent Claim
14 words
A method as defined in claim 7, wherein said acrylic polymer is poly(isobutyl methacrylate).
Claim 11
Dependent Claim
15 words
A method as defined in claim 6, wherein the Lewis acid compound is ferric chloride.
Claim 12
Dependent Claim
27 words
A method as defined in claim 7, wherein the acrylic polymer is poly(ethyl methacrylate), the volatile solvent is 2-butoxyethanol and the Lewis acid compound is ferric chloride.
Claim 13
Dependent Claim
28 words
A method for providing a thermoformable coating on polycarbonate substrates which comprises applying to a polycarbonate substrate a thermoformable silicone resin coating composition as defined in claim 1.
Claim 14
Dependent Claim
26 words
A method as defined in claim 12, wherein said Lewis acid compound is selected from the group consisting of ferric chloride, aluminum chloride and zinc chloride.
Claim 15
Dependent Claim
15 words
A method as defined in claim 13, wherein said Lewis acid compound is ferric chloride.
Claim 16
Dependent Claim
23 words
A method as defined in claim 14, wherein said ferric chloride is present in an amount to provide 10 to 30 ppm iron.
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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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |