The present invention relates to an agricultural film (AF) comprising at least one copolyamide, wherein the copolyamide has been prepared by polymerizing at least one lactam and a monomer mixture (M). The present invention further relates to a process for producing the agricultural film (AF) and to the use of the agricultural film (AF) as mulch film, as silage film, as greenhouse film or as silo film.

A new protective polymeric sheet is described wherein said polymeric sheet includes perforations and attached spacers that allow air and water circulation when the sheet is in use. The sheet protects underlying structures from damage while ensuring moisture migration between the protective polymeric sheet and the underlying structure. The protective polymeric sheet comprises a plurality of perforations extending through the sheet and a plurality of spacers, each spacer extending from a lower surface of the sheet adjacent to one side of each perforation. The spacers are created during perforation of the polymeric sheet. The protective polymeric sheet is useful in a number of applications, including without limitation: to protect pipelines; to replace geotextiles in heap leach processes; to line sandboxes and paving stones; to cover greenhouse floors; to make industrial or residential gutter caps; and as a filter.

This invention relates to a biodegradable film which is particularly suitable for the manufacture of packaging and is also characterised by high level mechanical properties.

A method for promoting germination of underground buds and growth of new-born root systems of ratoon sugarcane is to cut stubbles based on a depth survey of the stubbles of the ratoon sugarcane, particularly including steps of: for a ratoon sugarcane field after mechanical harvesting, cutting the stubbles with a sugarcane stubble cutting machine, and remaining underground stubbles of 5-7 cm after cutting; for a ratoon sugarcane field with manual harvesting, cutting the sugarcane with a hoe, and remaining underground stubbles of 10-12 cm after cutting, so as to realize sugarcane cutting and stubble cutting in one step; thereafter, applying fertilizers and pesticides, and hilling up, wherein the underground buds of the stubbles are controlled to be distributed 10-15 cm below ground after hilling up; and finally conducting whole film mulching. The present invention is advanced and practical, and easily used and promoted.

A blown film of soil biodegradable aliphatic polyesters produced primarily from diacid and diol monomers. The diacid monomers may be of any type including succinic acid, adipic acid, and hexanedioic acid. The diol monomer may be of any type including ethylene glycol, propanediol, butanediol, and hexanediol. Commercial aliphatic polyesters produced from diacid and diol monomers include polybutylene succinate (PBS), polybutylene adipate succinate (PBAS), and polybutylene adipate (PBA). Comonomers may also be added. Such comonomers include chemicals with a single carboxylic acid, hydroxy, or amine moiety, which act as chain terminators, chemicals with three or more carboxylic acid, epoxy, and/or hydroxy moieties which, act as branching agents.

A process for preparing a polymeric membrane for materials used in crop production comprising: a) providing an aqueous dispersion of a polyurethane or polyurethane-urea elastomer comprising segments formed from the copolymer segment of Formula I
A.sup.1-[Y.sup.1].sub.n-L-[Y.sup.2].sub.q-A.sup.2  Formula I
wherein A.sup.1 is an end capping group; A.sup.2 is hydrogen or an end capping group; each [Y.sup.1].sub.n and [Y.sup.2].sub.q is independently selected from a polyether macrodiol, polycarbonate macrodiol, polyester macrodiol, and wherein at least one of [Y.sup.1].sub.n and [Y.sup.2].sub.q is a polyester macrodiol; L is a divalent linking compound independently selected from urethane, urea, carbonate, ester, and phosphonate; n is an integer of 2 to 50; q is an integer of 2 to 50; and b) spraying the aqueous dispersion onto materials to be used in crop production to form a polymeric membrane on the materials.

A dynamic controllable system 10 for moderating energy absorption at the earth's surface includes a series of panel units 110, 610 mounted above the earth's surface over land and water masses. Each panel unit 110, 610 supports rotatable shafts 112, 612, with panels 100, 600 joined to or integrally formed with the shafts 112, 612. Each panel (forcing) 100, 600 has a radiation reflective surface 102, 602 and a radiation emissive surface 104, 604 opposite the radiation reflective surface 102, 602. The panels 100, 602 are selectively rotated into a predetermined one of a plurality of cardinal positions: reflective, emissive and neutral, or into an intermediate position between two of the cardinal positions. The programmable controller 130 receives various data including top of atmosphere satellite data, air temperature and relative humidity at panel units, weather data, time of day, position of panel units, radiation insolation, and combinations thereof. Responsive to real-time data, both local and regional, the programmable controller directs rotational orientation of panels within the panel units, causing a desired reflection of shortwave and longwave radiation away from the earth's surface.

A biodegradable film is prepared from a composition that includes a copolyester obtained by extrusion reaction of a branched aliphatic-aromatic copolyester derived from monomer a, monomer b, monomer c and monomer d with an organic peroxide. The film can be completely degraded into small molecular products such as carbon dioxide, water and the like under natural or composting conditions. Moreover, the film can be prepared having a thickness of 4-50 μm as required, and its mechanical properties can reach the same level as or even better than those of LDPE film.

The present invention relates to the use of a fumigant barrier film for treating soil by fumigation, said film having, on at least one portion of the outer surface thereof or on at least one portion of the inner surface thereof or on at least one portion of the outer and inner surfaces thereof, at least one continuous self-adhesive or self-sticking or tackifying area. The present invention also relates to the method for sealing soil intended for fumigation treatment or in the process of fumigation treatment or which has been treated by fumigation, by covering said soil with a self-adhesive fumigant barrier film, as well as to a kit for fumigation treatment including at least one self-adhesive fumigant barrier film and at least one fumigant.

A resin composition contains: (A) an ethylene-vinyl alcohol copolymer having an ethylene structural unit content of 20 to 60 mol %; (B) a saponified ethylene-vinyl acetate copolymer having an ethylene structural unit content of not less than 70 mol %; and (C) a sorbic acid ester; wherein the sorbic acid ester (C) is present in an amount of 0.00001 to 10 ppm based on the weight of the resin composition. The resin composition is resistant to coloration.