US4339503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of polycarbonate from ultraviolet radiation
Assignee: PPG Industries Inc
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Filing: 1981-03-02
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Granted: 1982-07-13
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Expires: 2001-03-02
Abstract
Abstract A method is disclosed for reducing ultraviolet radiation degradation of polycarbonate by means of an ultraviolet radiation screening compound incorporated in a tetrabutyltitanate film which does not interfere with lamination of polyurethane to the polycarbonate surface.
Inventors
- 👤 Thomas G. Rukavina
- 👤 Harold F. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:10
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/046; B; B32; B32B; B32B27/00; B32B27/36; B32B27/365; C08J7/0427; B32B2305/00; B32B2305/72; C08J2369/00; C08J2485/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31609
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
45 words
A method for reducing the ultraviolet radiation degradation of polycarbonate which comprises the steps of: a. applying a solution consisting essentially of an organic ultraviolet radiation screening compound and tetrabutyltitanate onto a polycarbonate surface; and b. curing the tetrabutyltitanate to form a hard crosslinked film.
Claim 2
Independent Claim
45 words
A method for reducing the ultraviolet radiation degradation of polycarbonate which comprises the steps of: a. applying a solution consisting essentially of an organic ultraviolet radiation screening compound and tetrabutyltitanate onto a polycarbonate surface; and b. curing the tetrabutyltitanate to form a hard crosslinked film.
Claim 3
Dependent Claim
22 words
The method according to claim 1, wherein the organic ultraviolet radiation screening compound and tetrabutyltitanate are in solution in an alcoholic solvent.
Claim 4
Dependent Claim
11 words
The method according to claim 2, wherein the solvent comprises isopropanol.
Claim 5
Dependent Claim
28 words
The method according to claim 3, wherein the organic ultraviolet radiation screening compound is selected from the group consisting of o-hydroxybenzophenone, phenyl salicylate, substituted benzotriazoles and mixtures thereof.
Claim 6
Dependent Claim
22 words
The method according to claim 4, wherein the ratio of organic ultraviolet radiation screening compound to tetrabutyltitanate is from 1:1 to 4:1.
Claim 7
Dependent Claim
28 words
An article comprising a polycarbonate substrate, on at least one major surface of which is a film consisting essentially of tetrabutyltitanate containing an organic ultraviolet radiation screening compound.
Claim 8
Dependent Claim
28 words
An article comprising a polycarbonate substrate, on at least one major surface of which is a film consisting essentially of tetrabutyltitanate containing an organic ultraviolet radiation screening compound.
Claim 9
Dependent Claim
27 words
The article of claim 6, wherein the organic ultraviolet radiation screening compound is selected from the group consisting of o-hydroxybenzophenone, phenyl salicylate, substituted benzotriazoles and mixtures thereof.
Claim 10
Dependent Claim
42 words
In a method of laminating polyurethane to polycarbonate, the improvement which comprises applying to the polycarbonate surface a film forming composition comprising tetrabutyltitanate and an organic ultraviolet radiation screening compound and curing the tetrabutyltitanate prior to bonding the polyurethane and polycarbonate surfaces.
Claim 11
Dependent Claim
42 words
In a method of laminating polyurethane to polycarbonate, the improvement which comprises applying to the polycarbonate surface a film forming composition comprising tetrabutyltitanate and an organic ultraviolet radiation screening compound and curing the tetrabutyltitanate prior to bonding the polyurethane and polycarbonate surfaces.
Claim 12
Dependent Claim
45 words
A laminated article which comprises: a. at least one ply of polycarbonate; b. at least one ply of polyurethane bonded to said polycarbonate ply; and c. a tetrabutyltitanate film comprising an organic ultraviolet radiation screening compound at the interface of said polyurethane and polycarbonate plies.
Claim 13
Dependent Claim
45 words
A laminated article which comprises: a. at least one ply of polycarbonate; b. at least one ply of polyurethane bonded to said polycarbonate ply; and c. a tetrabutyltitanate film comprising an organic ultraviolet radiation screening compound at the interface of said polyurethane and polycarbonate plies.
Claim 14
Dependent Claim
28 words
An article according to claim 9, wherein said organic ultraviolet radiation screening compound is selected from the group consisting of o-hydroxybenzophenone, phenyl salicylate, substituted benzotriazoles and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |