US5391609A
Expired / Lapsed
US
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Transparent films providing a barrier to the transmission of ultra-violet light
Assignee: ExxonMobil Oil Corp
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Filing: 1994-06-02
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Granted: 1995-02-21
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Expires: 2014-06-02
Abstract
Abstract A transparent polymeric film that provides a barrier to the transmission of ultra-violet light. The film results from the addition of titanium dioxide particles having an average particle size less than the wavelength of visible light, yet greater than the wavelength of ultra-violet light, to a polymeric material capable of being formed as a transparent film. More specifically, the titanium dioxide particles have an average size on the order of from about 0.010 mu m to 0.050 mu m and, preferably from about 0.018 mu m to 0.040 mu m.
Inventors
- 👤 Anthony R. Knoerzer
- 👤 Leland W. Reid
- 👤 Edwin M. Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:55
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
A method for manufacturing a transparent polymeric film providing a barrier to the transmission of ultra-violet light comprising: adding titanium dioxide having an average particle size less than the wavelength of visible light and greater than the wavelength of ultra-violet light to a copolymer of ethylene and propylene to provide a masterbatch; mixing said masterbatch with a homopolymer of polypropylene to provide an extrudable resin; and forming said extrudable resin as a transparent film.
Claim 2
Independent Claim
74 words
A method for manufacturing a transparent polymeric film providing a barrier to the transmission of ultra-violet light comprising: adding titanium dioxide having an average particle size less than the wavelength of visible light and greater than the wavelength of ultra-violet light to a copolymer of ethylene and propylene to provide a masterbatch; mixing said masterbatch with a homopolymer of polypropylene to provide an extrudable resin; and forming said extrudable resin as a transparent film.
Claim 3
Dependent Claim
23 words
The method according to claim 1, wherein the average particle size of said titanium dioxide is from about 0.010 μm to 0.050 μm.
Claim 4
Dependent Claim
23 words
The method according to claim 2, wherein the average particle size of said titanium dioxide is from about 0.018 μm to 0.040 μm.
Claim 5
Dependent Claim
20 words
The method according to claim 1, wherein the percentage by weight of said titanium dioxide is up to about 3.0%.
Claim 6
Dependent Claim
21 words
The method according to claim 4, wherein the percentage by weight of said titanium dioxide is from about 0.1% to 1.5%.
Claim 7
Dependent Claim
20 words
The method according to claim 1, wherein said copolymer includes from about 3% to about 10% by weight of ethylene.
Claim 8
Dependent Claim
75 words
A transparent polymeric film structure providing a barrier to the transmission of ultra-violet light produced by the process comprising: adding titanium dioxide having an average particle size less than the wavelength of visible light and greater than the wavelength of ultra-violet light to a copolymer of ethylene and propylene to provide a masterbatch; mixing said masterbatch with a homopolymer of polypropylene to provide an extrudable resin; and forming said extrudable resin as a transparent film.
Claim 9
Dependent Claim
75 words
A transparent polymeric film structure providing a barrier to the transmission of ultra-violet light produced by the process comprising: adding titanium dioxide having an average particle size less than the wavelength of visible light and greater than the wavelength of ultra-violet light to a copolymer of ethylene and propylene to provide a masterbatch; mixing said masterbatch with a homopolymer of polypropylene to provide an extrudable resin; and forming said extrudable resin as a transparent film.
Claim 10
Dependent Claim
23 words
The film according to claim 7, wherein the average particle size of said titanium dioxide is from about 0.010 μm to 0.050 μm.
Claim 11
Dependent Claim
23 words
The film according to claim 8, wherein the average particle size of said titanium dioxide is from about 0.018 μm to 0.040 μm.
Claim 12
Dependent Claim
20 words
The film according to claim 7, wherein the percentage by weight of said titanium dioxide is up to about 3.0%.
Claim 13
Dependent Claim
21 words
The film according to claim 10, wherein the percentage by weight of said titanium dioxide is from about 0.1% to 1.5%.
Claim 14
Dependent Claim
20 words
The film according to claim 7, wherein said copolymer includes from about 3% to about 10% by weight of ethylene.
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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) | 1998-02-20 | 1998-08-22 | 1999-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-20 | 2002-08-22 | 2003-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-20 | 2006-08-22 | 2007-02-21 | $7700.00 | Window Closed / Lapsed |