GB2330554A - Plastics film - Google Patents

Plastics film Download PDF

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Publication number
GB2330554A
GB2330554A GB9722194A GB9722194A GB2330554A GB 2330554 A GB2330554 A GB 2330554A GB 9722194 A GB9722194 A GB 9722194A GB 9722194 A GB9722194 A GB 9722194A GB 2330554 A GB2330554 A GB 2330554A
Authority
GB
United Kingdom
Prior art keywords
film
plant cover
cladding
plastics film
cover according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9722194A
Other versions
GB9722194D0 (en
Inventor
Anne Elizabeth Wheldon
Andrew Gilbert
Frederick John Davis
Haeringen Cornelius Johann Van
Simon Pearson
Paul Hadley
Jonathon Spencer West
Richard George Clevela Henbest
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Polythene Ltd
Original Assignee
British Polythene Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Polythene Ltd filed Critical British Polythene Ltd
Priority to GB9722194A priority Critical patent/GB2330554A/en
Publication of GB9722194D0 publication Critical patent/GB9722194D0/en
Publication of GB2330554A publication Critical patent/GB2330554A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/14—Greenhouses
    • A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B32B2419/06—Roofs, roof membranes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Abstract

A plastics film for use in greenhouse cladding or plant cover comprises a film containing a fluorescent chemical photofilter agent for selectively inhibiting the transmission of wavelengths in the region of from about 310nm to about 395nm of the electromagnetic spectrum. The film may also incorporate light stabilisers.

Description

IMPROVED FILMS The present invention relates to plastics films coatings and in particular flexible film products and their use as greenhouse films or plant cover films in order to promote growth by limiting or reducing the effect of disease, especially fungal attack.
The control of fungal diseases, particularly the control of Botrytis Cinera, which affects a number of commercial plant crops, notably strawberries, tomatoes and a variety of ornamental plants is of great interest to growers. Disease control represents a particularly acute problem when close cultivation of many plants of the same species occurs, as would be the case in commercial growing operations. However, the use of chemical based fungicides and inhibitors is not desirable especially concerning plants providing fruiting bodies which will enter the food chain.
It is known that spore production can be controlled by altering or restricting incident light e.g. by absorbing ultra-violet radiation in the wavelengths 310-395 nm (Leech, C M [1962]; Canadian Journal of Botany 40, 151-61).
Conversely, longer wavelengths (duo 450 nm ) inhibit spore production (Kumagai, T [1983]; Physologica Planta, 57, 468471). Therefore a means of applying such observed effects to cultivated crops appears of interest as a potentially preferable alternative to chemical agents.
The use of ultra violet absorbers in films has been previously evaluated for this purpose (e.g. Vakalonnakis, D J [1991], Plant Disease August, 795 - 797) and these are believed to have been applied in commercial products.
However, conventional ultra violet absorbers such as benzophenone or benzotriazole compounds show narrow absorption bands in the solar ultra violet wave bands with peak absorption occurring at wavelengths no greater than about 340 nm or 360 nm respectively. Other broad band ultra violet absorbers, for example zinc oxide or titanium oxide materials, reduce transmission unacceptably in the visible waveband.
Commercial cultivation of plants is conducted in a variety of ways often in a greenhouse or similar highly glazed or transparently clad growing house structure including traditional pitched roof aluminium frame greenhouses, geodesic framed greenhouses and tunnel greenhouses. Tunnel structures are often preferred because of the relative simplicity of construction relying upon providing over the intended area for cultivation supports over which a covering of a durable plastics sheet or film is applied. Simply for ease of reference, the word "greenhouse"will be used herein to mean any type of structure within which a cultivation area is defined for plant growth purposes and which has for this reason a relatively high proportion of transparent, semi-transparent or translucent cladding material.
An object of this invention is to provide improvements in the films or sheets used as light transmissive cover materials for greenhouses. In particular it is an object to provide a film which when appropriately applied in a commercial cultivation operation leads to reduction of fungal disease with consequential improvements in the quality of the cultivated plants.
According to one aspect of the present invention there is provided a plastics film for use in greenhouse cladding or plant cover comprising within the film a fluorescent chemical photofilter agent for selectively inhibiting the transmission of wavelengths in the region of from about 310 nm to about 395 nm of the electromagnetic spectrum.
A preferred agent for selectively inhibiting the transmission of wavelengths in the target range, particularly exhibiting peak absorptions at 376 nm and 390 nm, is 2,5-thiophenediylbis(5-tert-butyl-1,3benzoxazole) which has hitherto not been employed in control of fungal growth and offers the advantage of enhancing transmission by fluorescence at 420 - 430 nm.
Preferably the film is made from an extrudable filmforming polymer or copolymer exhibiting high absorbance in the ultra violet region of the electromagnetic spectrum and it may incorporate stabilisers to enhance the lifetime of the film in this respect. Films suitable for this purpose are those based on polyolefins, especially polyethylene and copolymers of ethylene with vinyl compounds such as vinyl acetate.
In preferred forms the greenhouse cladding or plant cover material is made from a plurality of films, ideally co-extruded, to form a product of a laminar structure. In this way the properties of the component layers can be carefully controlled to selectively provide a film which overall meets the demands of the target use. Thus for example possibly environmentally sensitive additives could be incorporated in an intermediate layer of the structure, whilst mechanical properties of the outer or surface layers can be enhanced to promote resistance to weathering by imparting durability and chemical resistance of the product.
According to a further aspect of the invention there is provided a plastics film for use in greenhouse cladding or plant cover comprising within the film a plurality of UV absorbers including a fluorescent chemical photofilter agent for selectively inhibiting the transmission of wavelengths in the region of from about 310 nm to about 395 nm of the electromagnetic spectrum.
A combination of UV absorbers for use in the invention may be selected such that at least one is from benzophenone and benzotriazole types, whilst another is the fluorescent compound 2, 5-thiophenediylbis (5-tert-butyl-1, 3-benzoxazole).
Furthermore the preferred absorbers offer the advantages that whilst UV is selectively absorbed the film remains essentially transparent to visible light, and the presence of the fluorescent compound enhances transmission in the 420 - 430 nm waveband.
According to this aspect also the film is manufactured from durable and W-stable or resistant plastics. Suitable polymeric extrudable film-forming plastics include the polyolefins e.g. polyethylene or ethylene copolymers.
According to a still further aspect of the invention a film is provided incorporating an optical brightener for enhancing the transmission of selected wavelengths in the region of about 420nm to 430nm of the electromagnetic spectrum in combination with a hindered amine light stabiliser and one or more UV absorbers for inhibiting the transmission of selected wavelengths in the region of from about 310nm to 395nm of the electromagnetic spectrum.
In a preferred embodiment a film is provided incorporating 2, 5-thiophenediylbis (5-tert-butyl-1, 3- benzoxazole) as the optical brightener for enhancing the transmission of selected wavelengths in the region of about 420nm to 430nm of the electromagnetic spectrum in combination with one or more W absorbers for inhibiting the transmission of selected wavelengths in the region of from about 310nm to 395nm of the electromagnetic spectrum which are essentially transparent to visible light, and a hindered amine light stabiliser.
Suitable light stabilisers referred to in the Examples hereinafter include those identified in the annexed structural formulae sheet as TINUVIN 622", "CHIMASORB 944" and"CHIMASORB 119".
The invention will now be described in more detail by way of the following Examples.
In one embodiment of the present invention there is provided a cover film having incorporated therein an optical brightener, 2,5-thiophenediylbis(5-tert-butyl-1, 3- benzoxazole), having a maximum ultra violet absorption at 376 nm to 390 nm and by fluorescence enhanced transmission of visible light in the range 420 nm to 430 nm. A comparative example relating to a film containing no such brightener is also presented as a control.
EXAMPLE 1 A series of three layered coextruded films were prepared with the following general constructions: Outer layers: 45 micron thick, using an ethylene vinyl acetate copolymer containing 4% vinyl acetate Centre layer: 90 microns in thickness, using an ethylenevinyl acetate copolymer containing 14% vinyl acetate.
Overall thickness: 180 microns Varying amounts of different additives were incorporated into the films as follows: A Outer layer: 3000 ppm Chimasorb 944 (a hindered amine light stabiliser) 1500 ppm benzophenone W absorber Centre layer: 5000 ppm of thiophene optical brightener [2, 5-thiophenediylbis (5 tert-butyl-1, 3-benzoxazole)] 12000 ppm Chimasorb 944 6000 ppm benzophenone W absorber B Outer and Centre layers: 9000 ppm Chimasorb 944 4500 ppm benzotriazole W absorber C Outer layers: 9000 ppm Chimasorb 944 4500 ppm benzotriazole UV absorber Centre layer: 5000 ppm of a thiophene optical brightener, as used in A 12000 ppm Chimasorb 944 6000 ppm benzophenone absorber D Outer and Central layers: 3000 ppm Chimasorb 944 1500 ppm benzophenone absorber Film D was used as control film; the additives used being those sufficient to confer to the film an adequate resistance to weathering.
In a comparative experiment, films A, B, and D were used to cover identical greenhouses which were used to grow strawberries. The progress of the infection by botrytis was monitored with the following results: Number of Infected Fruit *ELAPSED TIME FILM A FILM B FILM D (DAYS) 6 20 25 30 9 23 34 38 12 40 48 51 15 56 71 71 18 72 95 104 *Measured from time of first harvest of fruit. Statistical analysis of results from replicated trials showed that there was a significant difference betweem A and D, but NO significant difference between B and D.
EXAMPLE 2 Fruit from the greenhouses covered with films A and D in the above example were sampled and placed in cold storage. After six days of storage, the incidences of infection of the fruit were measured as follows; Film A: 28% Film D: 58% EXAMPLE 3 In a comparative experiment, the progress of botrytis in primrose plants was observed in identical greenhouses covered with films A and D. At the end of the experiment, the percentages of infected plants were measured as follows: Film A : 6. 1% (+1. 14) Film D: 14.4% (+1.50) EXAMPLE 4 In a comparative trial, following the procedure of Example 1, the progress of botrytis was observed in strawberries grown in greenhouses covered with Films C and D. It was found that under Film C the progress of botrytis was slower than under Film D.
The above examples demonstrate that the thiophene optical brightener provides an effective means of control of botrytis, and that it is much more effective than films containing a non-fluorescent W absorber.
The following examples illustrate the advantages of using the optical brightener in combination with a hindered amine light stabiliser (HALS) and one or more UV absorbers; the benefits arise from the ability of this combination to provide the essential light absorption characteristics for a longer time before these fade.
EXAMPLE 5 Sample of films A and C were exposed to natural weathering and decay of the effectiveness of the W absorption monitored by measuring the light transmission at 390nm wavelength. After 31 weeks the transmissions were measured as: Film A: 38.1% Film B: 7.5% Before exposure, the transmission at 390nm was less than 1 for both materials.
EXAMPLE 6 A series of films, 100 microns in thickness, were made using low density polyethylene, with varying amounts of different hindered amine light stabilisers with the thiophene optical brightener. These were subjected to accelerated weathering tests, and the relative lifetimes estimated by measuring the light transmission at 376 nm.
The following table shows the composition of the films and estimates of the lifetimes of the films.
Amount of HALS type Amount Time to thiophene of HALS 10% optical transmission at brightener 376nm (hrs) 5000 ppm None --- 67 5000 ppm Chimasorb 944 4000 ppm (plus 113 2000 ppm benz ophenone) 3000 ppm None --- 24 3000 ppm Chimasorb 944 5000 ppm 41 3000 ppm Tinuvin 622 5000 ppm 40 2500 ppm Tinuvin 119 5000 ppm 45 3000 ppm Hostavin N30 5000 ppm 48 The experiments demonstrate the benefits of using HALS in conjunction with the thiophene optical brightener.
The most preferred composition is a film which contains a thiophene optical brightener in conjunction with one or more W absorbers, such as a benzophenone or benztriazole, which are essentially transparent to visible light, and with a hindered amine light stabiliser.
The utility of the films of this invention in methods of cultivation and control of fungal growth are selfevident.
The advantages of the present invention are that the films have been shown to inhibit Botrytis in strawberries more effectively than those containing only the ultra violet absorbers such as benzotriazole. Use of the cover film also reduced the incidence of Botrytis on primrose plants.
It was also found that fruit, and in particular strawberries, which were grown under cover films of the present invention and then harvested showed enhanced resistance to fungal infection in cold storage.
The present invention also provides a cover film or greenhouse film which not only absorbs ultra violet light but also maintains and /or enhances the light transmission in the blue region (400 nm-450 nm). Furthermore said film is capable of withstanding prolonged periods of natural sunlight.

Claims (21)

  1. CLAIMS 1. A plastics film for use in greenhouse cladding or plant cover comprising a film having there within a fluorescent chemical photofilter agent for selectively inhibiting the transmission of wavelengths in the region of from about 310nm to about 395nm of the electromagnetic spectrum.
  2. 2. A plastics film for use in greenhouse cladding or plant cover according to claim 1 wherein the photofilter agent selectively exhibits peak absorptions at 376 nm and 390 nm.
  3. 3. A plastics film for use in greenhouse cladding or plant cover according to claims 1 or 2 wherein the photofilter agent is 2, 5-thiophenediylbis (5-tert-butyl-1, 3-benzoxazole).
  4. 4. A plastics film for use in greenhouse cladding or plant cover according to claim 3 wherein the photofilter agent enhances transmission by fluorescence at 420 - 430nm.
  5. 5. A plastics film for use in greenhouse cladding or plant cover according to any one of the preceding claims wherein the film is made from an extrudable film-forming polymer exhibiting high absorbance in the ultra violet region of the electromagnetic spectrum.
  6. 6. A plastics film for use in greenhouse cladding or plant cover according to claims 1-5 wherein the film is made from and extrudable film-forming copolymer exhibiting high absorbance in the ultra violet region of the electromagnetic spectrum.
  7. 7. A plastics film for use in greenhouse cladding or plant cover according to claims 5 or 6 the film further has incorporated therein stabilisers to enhance the lifetime of the film.
  8. 8. A plastics film for use in greenhouse cladding or plant cover according to claims 5 or 6 wherein the film is selected from those based on polyolefins, especially polyethylene and copolymers of ethylene with vinyl compounds such as vinyl acetate.
  9. 9. A plastics film for use in greenhouse cladding or plant cover according any one of the preceding claims wherein the cladding or plant cover is made from a plurality of coextruded films to form a product of a laminar structure such that the properties of the component layers can be carefully controlled to selectively provide a film which overall meets the demands of the target use.
  10. 10. A plastics film for use in greenhouse cladding or plant cover according to claim 9 wherein an intermediate layer of the laminate structure has environmentally sensitive additives incorporated therein.
  11. 11. A plastics film for use in greenhouse cladding or plant cover according to claim 9 wherein the mechanical properties of the outer or surface layers can be enhanced to promote resistance to weathering by imparting durability and chemical resistance of the product.
  12. 12. A plastics film for use in greenhouse cladding or plant cover comprising a film having there within a plurality of W absorbers including a fluorescent chemical photofilter agent for selectively inhibiting the transmission of wavelengths in the region of from about 310nm to about 395nm of the electromagnetic spectrum.
  13. 13. A plastics film for use in greenhouse cladding or plant cover according to claim 12 wherein a combination of UV absorbers are selected such that at least one is from benzophenone and benzotriazole types, whilst another is the fluorescent compound 2, 5-thiophenediylbis (5-tert-butyl-1, 3- benzoxazole).
  14. 14. A plastics film for use in greenhouse cladding or plant cover according to claim 14 wherein the absorbers selectively absorb W the film remains essentially transparent to visible light.
  15. 15. A plastics film for use in greenhouse cladding or plant cover according to claims 12-14 wherein the presence of the fluorescent compound enhances transmission in the 420-430nm waveband.
  16. 16. A plastics film for use in greenhouse cladding or plant cover according to any one of claims 12-15 wherein the film is manufactured from durable and UV-stable or resistant plastics selected from suitable polymeric extrudable film-forming plastics such as polyolefins, polyethylene or ethylene copolymers.
  17. 17. A plastics film for use in greenhouse cladding or plant cover wherein the film is provided with an optical brightener incorporated therein for enhancing the transmission of selected wavelengths in the region of about 420nm to 430nm of the electromagnetic spectrum in combination with a hindered amine light stabiliser and one or more W absorbers for inhibiting the transmission of selected wavelengths in the region of from about 310nm to 395nm of the electromagnetic spectrum.
  18. 18. A plastics film for use in greenhouse cladding or plant cover according to claim 17 wherein the film incorporates 2,5thiophenediylbis (5-tert-butyl-1, 3-benzoxazole) as the optical brightener for enhancing the transmission of selected wavelengths in the region of about 420nm to 430nm of the electromagnetic spectrum in combination with one or more UV absorbers for inhibiting the transmission of selected wavelengths in the region of from about 310nm to 395nm of the electromagnetic spectrum which are essentially transparent to visible light, and a hindered amine light stabiliser.
  19. 19. A plastics film for use in greenhouse cladding or plant cover according to claims 17-18 wherein suitable light stabilisers include TVTINUVIN 622", "CHIMASORB 944" and "CHIMASORB 119".
  20. 20. A plastics film for use in greenhouse cladding or plant cover as herein described with reference to the examples.
  21. 21. A plastics film for use in greenhouse cladding or plant cover as herein described with reference to the examples and drawings.
GB9722194A 1997-10-22 1997-10-22 Plastics film Withdrawn GB2330554A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9722194A GB2330554A (en) 1997-10-22 1997-10-22 Plastics film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9722194A GB2330554A (en) 1997-10-22 1997-10-22 Plastics film

Publications (2)

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GB9722194D0 GB9722194D0 (en) 1997-12-17
GB2330554A true GB2330554A (en) 1999-04-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019197805A1 (en) * 2018-04-12 2019-10-17 British Polythene Limited Polymeric film

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2024588A (en) * 1978-07-10 1980-01-16 Plastics Fabricating & Distrib Protective enclosure
WO1996022012A1 (en) * 1995-01-19 1996-07-25 Henri Marie Vanier Cover for cultivating particularly bananas

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2024588A (en) * 1978-07-10 1980-01-16 Plastics Fabricating & Distrib Protective enclosure
WO1996022012A1 (en) * 1995-01-19 1996-07-25 Henri Marie Vanier Cover for cultivating particularly bananas

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WPI Abstract Accession Number 93-316534 and JP05227849 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019197805A1 (en) * 2018-04-12 2019-10-17 British Polythene Limited Polymeric film

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Publication number Publication date
GB9722194D0 (en) 1997-12-17

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