Gas-impermeable polyurea polymer systems
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United States of America Patent
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Nov 23, 1993
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Feb 14, 1992
filing date -
Feb 14, 1992
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Abstract
Block copolymers possessing good gas impermeability, solvent resistance, and physical properties are prepared by forming a prepolymer through the reaction of a diisocyanate compound with a diamine compound, and thereafter reacting the prepolymer with an amine-terminated butadiene-acrylonitrile oligomer.
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