Polyoxalkylenated disazo colored thermoplastic resins
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United States of America Patent
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Sep 21, 1999
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Nov 7, 1997
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Nov 7, 1997
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Abstract
Disazo chromphores having at least two different poly(oxyalkylene) substituents are linked together by a covalent bond or by an intervening connecting group to form dimers. The preferred poly(oxyalkylene) substituents are straight chain polymers consisting of ethylene oxide and propylene oxide. The disazo colorants are useful for coloring thermoplastic resins such as polypropylene and polyethylene and show improved extraction, migration, clarity and thermal stability characteristics as compared to standard monoazo colorants.
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