Patent US4636408A successfully refreshed from Google Patents.
US4636408A
Expired / Lapsed
US
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Ultraviolet radiation stabilized polymer compositions
Assignee: General Electric Co
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Filing: 1985-07-22
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Granted: 1987-01-13
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Expires: 2005-07-22
Abstract
Abstract A process and composition for improving the ultraviolet radiation stability of articles made from resins subject to photo degradation by contacting the article at a selected temperature with a stabilizer composition comprising an ultraviolet radiation absorber and a hindered amine light stabilizer in a nonagressive liquid carrier.
Inventors
- 👤 Blair T. Anthony
- 👤 Daniel R. Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:43
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J7/065; Y; Y10; Y10T; Y10T428/00; Y10T428/8305
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A method for imparting improved ultraviolet radiation stability to an article comprising a member selected from the group of resins consisting of polystyrene resins, acrylonitrile-butadiene-styrene resins, and polyphenylene ether resins which comprises contacting the surface of the article with a stabilizer composition comprising a hindered amine light stabilizer and ultraviolet radiation absorber compound in nonaggressive liquid carrier at a temperature sufficient to effectively impregnate the surface of the article with the hindered amine light stabilizer and the ultraviolet radiation absorber.
Claim 2
Independent Claim
80 words
A method for imparting improved ultraviolet radiation stability to an article comprising a member selected from the group of resins consisting of polystyrene resins, acrylonitrile-butadiene-styrene resins, and polyphenylene ether resins which comprises contacting the surface of the article with a stabilizer composition comprising a hindered amine light stabilizer and ultraviolet radiation absorber compound in nonaggressive liquid carrier at a temperature sufficient to effectively impregnate the surface of the article with the hindered amine light stabilizer and the ultraviolet radiation absorber.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the temperature is between about 60° C. and the glass transition temperature of the resin.
Claim 4
Dependent Claim
35 words
The process of claim 2 wherein the hindered amine light stabilizer is selected from the group consisting of 2-hydroxy-4-dodecylbenzophenone and 2-hydroxy-4-octyloxybenzophenone; the ultraviolet radiation absorber is selected from the group consisting of bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate.
Claim 5
Dependent Claim
32 words
The process of claim 3 wherein the nonaggressive liquid carrier is selected from the group consisting of hydroxy-ethers, alcohols, mixtures of water and alcohols, liquid aliphatic hydrocarbons, liquid cycloaliphatic hydrocarbons, and chlorofluorocarbons.
Claim 6
Dependent Claim
20 words
The method of claim 4 wherein the nonaggressive liquid carrier is selected from the group consisting of acetone and isopropanol.
References Cited (Backward Citations)
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US4413075A
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US4410594A
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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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |