Title:
LAYERED FILM, FILM FOR PROTECTED HORTICULTURE, AND KNITTED FABRIC
Document Type and Number:
WIPO Patent Application WO/2023/062955
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a layered film in which appearance degradation and yellowing of the film by ultraviolet radiation is suppressed and which can maintain high light transmittance; a film for protected horticulture; and a knitted fabric and the like. This layered film has a heat ray reflection layer and a weather-resistant layer on at least one surface of the heat ray reflection layer. The heat ray reflection layer has a multilayer structure in which at least 20 layers of a first layer mainly made of a resin and a second layer mainly made of a resin are layered alternately in the thickness direction. The first layer contains poly(ethylene naphthalate). At least one surface of the multilayer structure has a protective layer. The thickness of the protective layer is 10 µm or less. The protective layer is a layer comprising mainly the resin of the first layer. The weather-resistant layer comprises a resin composition containing an ultraviolet radiation absorber having a triazine skeleton. The content of the ultraviolet radiation absorber in the weather-resistant layer is 8-45 mass%. The thickness of the weather-resistant layer is 3-15 μm. The secondary reflection band of the layered film is 400-700 nm. The spectral transmittance in the secondary reflection band is 60% or more.
Inventors:
SHIMIZU TOMOKO (JP)
OKUMURA HISAO (JP)
OKUMURA HISAO (JP)
Application Number:
PCT/JP2022/032348
Publication Date:
April 20, 2023
Filing Date:
August 29, 2022
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B32B27/36; A01G9/14; A01G13/02
Foreign References:
| JP2017153377A | 2017-09-07 | |||
| JP2018057276A | 2018-04-12 | |||
| JP2016215643A | 2016-12-22 | |||
| JP4200797B2 | 2008-12-24 | |||
| JP5384980B2 | 2014-01-08 | |||
| JP6780636B2 | 2020-11-04 |
Other References:
"Reflectivity of Iridescent Coextruded Multilayered Plastic Films", POLYMER ENGINEERING AND SCIENCE, vol. 13, no. 3, May 1973 (1973-05-01)
Attorney, Agent or Firm:
UNIUS PATENT ATTORNEYS OFFICE (JP)
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