Patent US3971755A successfully refreshed from Google Patents.
US3971755A
Expired / Lapsed
US
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Polymer compositions containing titanium dioxide having improved visible and ultraviolet light stability
Assignee: Eastman Kodak Co
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Filing: 1974-10-02
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Granted: 1976-07-27
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Expires: 1994-10-02
Abstract
Abstract The zinc or manganese salt of 3,5-di-tert-alkyl-4-hydroxybenzoic acid is an ultraviolet absorber which provides a highly effective ultraviolet stabilizer system for TiO2-pigmented polymeric compositions.
Inventors
- 👤 Joseph Salvatore Zannucci
- 👤 Gerald Ray Lappin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
An ultraviolet light stabilized pigmented polymeric composition comprising (1) a polymeric composition normally susceptible to degradation due to visible or ultraviolet light selected from the group consisting of polypropylene and polypropylene containing graft reacted acrylic acid, (2) titanium dioxide and (3) as the ultraviolet stabilizer about 0.01 to 5 weight percent of a zinc salt of a compound having the formula ##SPC2## wherein R 1 , R 2 and R 3 are the same or different and each represents an alkyl group having 1 to 8 carbon atoms; and X + 2 is Zn + 2 .
Claim 2
Dependent Claim
97 words
An ultraviolet light stabilized pigmented polymeric composition comprising (1) a polymeric composition normally susceptible to degradation due to visible or ultraviolet light selected from the group consisting of polypropylene and polypropylene containing graft reacted acrylic acid, (2) titanium dioxide and (3) as the ultraviolet stabilizer about 0.01 to 5 weight percent of a zinc salt of a compound having the formula ##SPC2## wherein R 1 , R 2 and R 3 are the same or different and each represents an alkyl group having 1 to 8 carbon atoms; and X + 2 is Zn + 2 .
Claim 3
Dependent Claim
14 words
An ultraviolet light stabilized pigmented composition of claim 1 wherein the polyolefin is polypropylene.
Claim 4
Dependent Claim
20 words
An ultraviolet light stabilized pigmented composition of claim 1 wherein the polyolefin is a polypropylene containing graft reacted acrylic acid.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |