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US4686791A
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Agricultural film structure
Assignee: Kyowa Chemical Industry Co Ltd
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Filing: 1986-11-24
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Granted: 1987-08-18
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Expires: 2006-11-24
Abstract
Abstract An agricultural film structure composed of a mixture of a thermoplastic resin and an infrared radiation-absorbing powdery inorganic compound, said mixture comprising (a) 100 parts by weight of a thermoplastic resin and (b) about 1 to about 20 parts by weight of a hydrotalcite powder, as the infrared radiation absorbing powdery inorganic compound, having an average secondary particle diameter of not more than about 5 microns and a BET specific surface area of not more than about 30 m2/g and being represented by the following formula (1) M1-x2+ Alx(OH)2(An-)x/nmH2O (1) wherein M2+ represents a divalent metal ion selected from the group consisting of Mg, Ca and Zn ions, An- represents an anion having a valence of n, and x and m satisfy the following conditions 0<x<0.5 0</=m</=2.
Inventors
- 👤 Shigeo Miyata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:11
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; A; A01; A01G; A01G9/00; A01G9/14; A01G9/1438; C08K3/10; C08K3/105; C08K3/18; C08K3/24; C08K3/26; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/25
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
In a method for growing cultivated plants which comprises covering the locus where the cultivated plants are grown or are to be grown with an agricultural film structure, the improvement comprising the step of covering said locus with a film structure comprised of a mixture of (a) 100 parts by weight of a thermoplastic resin and (b) about 1 to about 20 parts by weight of a hydrotalcite powder, as an infrared radiation absorbing powdery inorganic compound, having an average secondary particle diameter of not more than about 5 microns and a BET specific surface area of not more than about 30 m 2 /g and being represented by the following formula (1) M.sub.1-x.sup.2 Al.sub.x (OH).sub.2 (A.sup.n-).sub.x/n.mH.sub.2 O (1) wherein M 2+ represents a divalent metal ion selected from the group consisting of Mg, Ca and Zn ions, A n- represents an anion having a valence of n, and x and m satisfy the following conditions 0<x<0.5 0≦m≦2, thereby improving visible light availability and heat retention for said cultivated plants.
Claim 2
Dependent Claim
170 words
In a method for growing cultivated plants which comprises covering the locus where the cultivated plants are grown or are to be grown with an agricultural film structure, the improvement comprising the step of covering said locus with a film structure comprised of a mixture of (a) 100 parts by weight of a thermoplastic resin and (b) about 1 to about 20 parts by weight of a hydrotalcite powder, as an infrared radiation absorbing powdery inorganic compound, having an average secondary particle diameter of not more than about 5 microns and a BET specific surface area of not more than about 30 m 2 /g and being represented by the following formula (1) M.sub.1-x.sup.2 Al.sub.x (OH).sub.2 (A.sup.n-).sub.x/n.mH.sub.2 O (1) wherein M 2+ represents a divalent metal ion selected from the group consisting of Mg, Ca and Zn ions, A n- represents an anion having a valence of n, and x and m satisfy the following conditions 0<x<0.5 0≦m≦2, thereby improving visible light availability and heat retention for said cultivated plants.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the thermoplastic resin is selected from the group consisting of olefin resins, vinyl chloride resin, and blends of these resins.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein the hydrotalcite powder of formula (1) is surface-treated with a surface-treating agent selected from the group consisting of higher fatty acids, alkali metal salts of higher fatty acids and coupling agents.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the film structure has a thickness of about 10 to about 200 microns.
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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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |