Agricultural film

• US 5,262,233 A
• Filed: 02/19/1992
• Issued: 11/16/1993
• Est. Priority Date: 02/19/1991
• Status: Expired due to Term

• Current Assignee: Mitsubishi Petrochemical Co., Ltd. (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Petrochemical Co., Ltd. (Mitsubishi Chemical Group Corp.)
• Inventors: Okada, Tadao, Ohnishi, Shunichi, Mori, Seiya, Sudo, Kiyomaro, Ikeno, Hajime, Shichijo, Keiko
• Primary Examiner(s): Sluby, P. C.
• Application Number:
  US07/836,959
• Time in Patent Office: 636 Days
• Field of Search: 428/910, 428/520, 428/516, 428/331, 428/327, 47/29
• US Class Current: 428/327
• CPC Class Codes: A01G 9/1438 Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
• CPC Class Codes: B32B 2307/7246 Water vapor barrier
• CPC Class Codes: B32B 2410/00 Agriculture-related articles
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: C08F 210/02 Ethene
• CPC Class Codes: C08F 220/34 Esters containing nitrogen , e.g. N,N-dimethylaminoethyl (meth)acrylate
• CPC Class Codes: C08J 2323/04 Homopolymers or copolymers of ethene
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08K 3/26 Carbonates; Bicarbonates
• CPC Class Codes: C08K 9/12 Adsorbed ingredients , e.g. ingredients on carriers
• CPC Class Codes: C08L 23/04 Homopolymers or copolymers of ethene
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 23/0892 containing monomers with other atoms than carbon, hydrogen or oxygen atoms
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: Y02A 40/25 Greenhouse technology, e.g. cooling systems therefor
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31913 : Monoolefin polymer
• CPC Class Codes: Y10T 428/31928 : Ester, halide or nitrile of addition polymer

Abstract

An agricultural film comprising a thermoplastic resin film containing an ethylene copolymer with a hindered amine in its side chain and having coated thereon an anti-fogging agent comprising an inorganic hydrophilic colloidal substance and a hydrophilic organic compound and an anti-fogging agricultural film comprising a thermoplastic resin film containing an ethylene copolymer with a hindered amine in its side chain and, if desired, further containing a hydrotalcite compound, with an anti-fogging agent coated on the inside surface thereof or incorporated therein. The agricultural films have excellent weather resistance, anti-fogging properties, heat-retaining properties, and transparency.

Claims

1. An agricultural film comprising (A'"'"') an ethylene resin film containing an ethylene copolymer with a hindered amine in its side chain as a light stabilizer, and having coated on said ethylene resin film an anti-fogging agent comprising an inorganic hydrophilic colloidal substance and a hydrophilic organic compound, wherein said ethylene copolymer is a copolymer comprising (a) ethylene and (b) a vinyl compound represented by formula (I):

##STR2## wherein R₁ and R₂, which may be the same or different, each represents a hydrogen atom or a methyl group; and

R₃ represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, and the content of a unit derived from said vinyl compound (b) in said ethylene resin film (A'"'"') is from 0.05 to 5.0% by weight.

2. An agricultural film as claimed in claim 1, wherein said ethylene copolymer is a copolymer comprising from 99 to 99.9 mol % of ethylene and from 0.01 to less than 1 mol % of a vinyl compound represented by formula (I).

3. An agricultural film as claimed in claim 1, wherein said ethylene resin film (A'"'"') is a film of an ethylene resin selected from the group consisting of an ethylene-vinyl acetate copolymer, a low-density polyethylene, and a linear low-density polyethylene.

4. An anti-fogging agricultural film comprising (A) an ethylene resin film containing (1) an ethylene copolymer with a hindered amine in its side chain which is obtained by copolymerizing ethylene and a compound represented by the following formula (I):

##STR3## wherein R₁ and R₂, which may be the same or different, each represents a hydrogen atom or a methyl group; and

R₃ represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, as a light stabilizer, wherein said ethylene copolymer is present in an amount such that said film (A) contains from 0.05 to 5% by weight of a unit derived from said compound according to formula (I) and (2) from 0.5 to 20% by weight of a hydrotalcite compound, and an anti-fogging agent coated on or incorporated in said film (A).

5. An agricultural film as claimed in claim 4, wherein said ethylene copolymer is a copolymer containing said compound of formula (I) in an amount of less than 1 mol % based on the total amount of ethylene and compound of formula (I), and having a melt flow rate of from 0.1 to 200 g/10 min.

6. An agricultural film as claimed in claim 5, wherein said ethylene copolymer is a copolymer comprising from 99 to 99.9 mol % of ethylene and from 0.01 to 1 mol % of the compound represented by formula (I).

7. An agricultural film as claimed in claim 4, wherein said ethylene resin film (A) is a film of an ethylene resin selected from the group consisting of an ethylene-vinyl acetate copolymer, a low-density polyethylene, and a linear low-density polyethylene.

8. An agricultural laminate film comprising (A) an ethylene resin film containing (1) an ethylene copolymer with a hindered amine in its side chain which is obtained by copolymerizing ethylene and a compound represented by the following formula (I):

##STR4## wherein R₁ and R₂, which may be the same or different, each represents a hydrogen atom or a methyl group; and

R₃ represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, as a light stabilizer, wherein said ethylene copolymer is present in an amount such that said film (A) contains from 0.05 to 5% by weight of a unit derived from said compound according to formula (I) and (2) from 0.5 to 20% by weight of a hydrotalcite compound as an outer layer and (B) an anti-fogging resin film as an inner layer.

9. An agricultural film as claimed in claim 8, wherein said ethylene copolymer is a copolymer containing said compound of formula (I) in an amount of less than 1 mol % based on the total amount of ethylene and compound of formula (I), and having a melt flow rate of from 0.1 to 200 g/10 min.

10. An agricultural film as claimed in claim 9, wherein said ethylene copolymer is a copolymer comprising from 99 to 99.9 mol % of ethylene and from 0.01 to 1 mol % of the compound represented by formula (I).

11. An agricultural film as claimed in claim 8, wherein said ethylene resin film (A) is a film of an ethylene resin selected from the group consisting of an ethylene-vinyl acetate copolymer, a low-density polyethylene, and a linear low-density polyethylene.

12. An agricultural laminate film comprising (A") an ethylene resin film as an outermost layer containing an ethylene copolymer with a hindered amine in its side chain which is obtained by copolymerizing ethylene and a compound represented by the following formula (I):

##STR5## wherein R₁ and R₂, which may be the same or different, each represents a hydrogen atom or a methyl group; and

R₃ represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, as a light stabilizer, wherein said ethylene copolymer is present in an amount such that said film (A") contains from 0.05 to 5% by weight of a unit derived from said compound according to formula (I), and (C) a thermoplastic resin film as an innermost layer containing from 0.5 to 20% by weight of a hydrotalcite compound, and an anti-fogging agent coated on or incorporated in said film (C).

13. An agricultural laminate film as claimed in claim 12, wherein said ethylene copolymer is a copolymer containing said compound of formula (I) in an amount of less than 1 mol % based on the total amount of ethylene and compound of formula (I), and having a melt flow rate of from 0.1 to 200 g/10 min.

14. An agricultural laminate film as claimed in claim 13, wherein said ethylene copolymer is a copolymer comprising from 99 to 99.9 mol % of ethylene and from 0.01 to 1 mol % of the compound represented by formula (I).

15. An agricultural laminate film as claimed in claim 13, wherein said ethylene resin film (A") is a film of an ethylene resin selected from the group consisting of an ethylene-vinyl acetate copolymer, a low-density polyethylene, and a linear low-density polyethylene.

16. An agricultural laminate film comprising (A") an ethylene resin film as an outermost layer containing an ethylene copolymer with a hindered amine in its side chain which is obtained by copolymerizing ethylene and a compound represented by the following formula (I):

##STR6## wherein R₁ and R₂, which may be the same or different, each represents a hydrogen atom or a methyl group; and

R₃ represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, as a light stabilizer, wherein said ethylene copolymer is present in an amount such that said film (A") contains from 0.05 to 5% by weight of a unit derived from said compound according to formula (I), (C'"'"') a thermoplastic resin film as an intermediate layer containing from 0.5 to 20% by weight of a hydrotalcite compound, and (B'"'"') an anti-fogging resin film as an innermost layer.

17. An agricultural laminate film as claimed in claim 16, wherein said ethylene copolymer is a copolymer containing said compound of formula (I) in an amount of less than 1 mol % based on the total amount of ethylene and compound of formula (I), and having a melt flow rate of from 0.1 to 200 g/10 min.

18. An agricultural laminate film as claimed in claim 17, wherein said ethylene copolymer is a copolymer comprising from 99 to 99.9 mol % of ethylene and from 0.01 to 1 mol % of the compound represented by formula (I).

19. An agricultural laminate film as claimed in claim 16, wherein said ethylene resin film (A") is a film of an ethylene resin selected from the group consisting of an ethylene-vinyl acetate copolymer, a low-density polyethylene, and a linear low-density polyethylene.