Patent US4481254A successfully refreshed from Google Patents.
US4481254A
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Agricultural plastic film
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1982-06-24
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Granted: 1984-11-06
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Expires: 2002-06-24
Abstract
Abstract An agricultural plastic film improved in retention of infrared radiation which comprises an olefin resin film produced by forming a composition comprising 100 parts by weight of an olefin resin (A) and 2 to 25 parts by weight of a compound oxide (B) comprising SiO2 and at least one member of the oxides of metals selected from Groups II, III and IV of the periodic table, the ratio of the refractive index (nA) of said olefin resin to that (nB) of said compound oxide, nA/nB, being within a range of 0.99 to 1.02, into film.
Inventors
- 👤 Nobuo Fukushima
- 👤 Kiyohiko Nakae
- 👤 Takayuki Terazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:46
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; A; A01; A01G; A01G9/00; A01G9/14; A01G9/1438; B32B27/06; B32B27/08; B32B27/18; B32B27/30; B32B27/306; C; C08; C08K; C08K3/00; C08K3/34; B32B2250/00; B32B2250/24; B32B2250/246; B32B2264/00; B32B2264/10; B32B2264/102; B32B2323/00; B32B2323/04; B32B2331/00; B32B2331/04; B32B2410/00; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/25; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/258; Y10T428/259; Y10T428/26; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
An agricultural plastic film laminate which comprises an olefin resin film produced by forming into a film a composition comprising 100 parts by weight of an olefin resin (A) and 2 to 25 parts by weight per 100 parts by weight of said olefin resin of an amorphous hydrated aluminum silicate gel represented by the formula: (SiO.sub.2).sub.x.(Al.sub.2 O.sub.3).sub.y.nH.sub.2 O wherein x and y are positive numbers such that 0.08≦y/x≦0.33 and n is a positive number, said aluminum silicate containing not less than 10% of adsorbed water at 25° C. and at a relative humidity of 65%, the ratio of the refractive index (n A ) of said olefin resin to that (n B ) of said aluminum silicate gel, n A /n B , being within the range of 0.99 to 1.02, wherein said olefin film is laminated with laminating resin selected from ionomer resins (C) and olefin resins (D) on one or both sides of the film.
Claim 2
Dependent Claim
158 words
An agricultural plastic film laminate which comprises an olefin resin film produced by forming into a film a composition comprising 100 parts by weight of an olefin resin (A) and 2 to 25 parts by weight per 100 parts by weight of said olefin resin of an amorphous hydrated aluminum silicate gel represented by the formula: (SiO.sub.2).sub.x.(Al.sub.2 O.sub.3).sub.y.nH.sub.2 O wherein x and y are positive numbers such that 0.08≦y/x≦0.33 and n is a positive number, said aluminum silicate containing not less than 10% of adsorbed water at 25° C. and at a relative humidity of 65%, the ratio of the refractive index (n A ) of said olefin resin to that (n B ) of said aluminum silicate gel, n A /n B , being within the range of 0.99 to 1.02, wherein said olefin film is laminated with laminating resin selected from ionomer resins (C) and olefin resins (D) on one or both sides of the film.
Claim 3
Dependent Claim
30 words
An agricultural plastic film according to claim 1, wherein said laminated film comprises an interlayer of the olefin resin film and outer layers of the film of the laminating resin.
Claim 4
Dependent Claim
27 words
An agricultural plastic film according to claim 1, wherein said olefin resin (A) is a low-density polyethylene or ethylene/α-olefin copolymer having a density of 0.910 to 0.935.
Claim 5
Dependent Claim
28 words
An agricultural plastic film according to claim 1, wherein said olefin resin (A) is an ethylene/vinyl acetate copolymer containing not more than 30% by weight of vinyl acetate.
Claim 6
Dependent Claim
48 words
An agricultural plastic film according to claim 1, wherein said ionomer resin (C) used as outer layers is an ethylene/methacryclic acid copolymer of zinc ion- or sodium ion-crosslinked structure having a density of 0.935 to 0.975 g/cm 3 and a melt index of 0.5 to 7 g/10 min.
Claim 7
Dependent Claim
42 words
An agricultural plastic film according to claim 1, wherein said olefin resin (D) used as outer layers is a polyethylene or ethylene/α-olefin copolymer having a density of 0.915 to 0.935 g/cm 3 and a melt index of 0.1 to 4 g/10 min.
Claim 8
Dependent Claim
43 words
An agricultural plastic film according to claim 1, wherein said olefin resin (D) used as outer layers is an ethylene/vinyl acetate copolymer having a melt index of 0.1 to 3 g/10 min., a vinyl acetate content of not more than 20% by weight.
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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |