Stabilizing polymers and polymer films
AssigneeRobinson Brothers Limited
InventorsWilliam R. Poyner, Khirud B. Chakraborty
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Abstract
A composition which comprises a polymer and a nickel dialkyldithiocarbamate of the formula (R.sup.1 R.sup.2 NCSS).sub.2 Ni, wherein R.sup.1 and R.sup.2 are the same or different branched-chain C.sub.5-18 alkyl groups. Such a composition, which preferably additionally comprises a zinc dialkyldithiocarbamate, can be used, e.g. in film or sheet form, to protect flora at an agricultural or horticultural locus.
Claims26
In a method of protecting flora at an agricultural or horticultural locus and maintaining an artificial environment more suited to growth of the flora than the natural environment by placing a polymeric film or sheet in the path of sunlight to the flora or to the locus of the flora, the improvement comprising placing in the said path a stabilised polymeric film or sheet rendered more resistant to weathering in the presence of fumigant and pesticidal chemicals adversely affecting its weather resistance wherein said polymeric film or sheet has been formed from a composition which comprises a polymer and an effective stabilising amount of a nickel dialkyldithiocarbamate of the formula (R.sup.1 R.sup.2 NCSS).sub.2 Ni, wherein R.sup.1 and R.sup.2 are the same or different branched-chain alkyl groups of 5 to 18 carbon atoms.
In a method of protecting flora at an agricultural or horticultural locus and maintaining an artificial environment more suited to growth of the flora than the natural environment by placing a polymeric film or sheet in the path of sunlight to the flora or to the locus of the flora, the improvement comprising placing in the said path a stabilised polymeric film or sheet rendered more resistant to weathering in the presence of fumigant and pesticidal chemicals adversely affecting its weather resistance wherein said polymeric film or sheet has been formed from a composition which comprises a polymer and an effective stabilising amount of a nickel dialkyldithiocarbamate of the formula (R.sup.1 R.sup.2 NCSS).sub.2 Ni, wherein R.sup.1 and R.sup.2 are the same or different branched-chain alkyl groups of 5 to 18 carbon atoms and a zinc dialkyldithiocarbamate of the formula (R.sup.3 R.sup.4 NCSS).sub.2 Zn, wherein R.sup.3 and R.sup.4 are the same or different branched-chain alkyl groups of 5 to 18 carbon atoms.
Dependencies are inferred from the claim text.