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US 5,672,656 AGranted
Temperature sensitive water absorbing and discharging polymer composition
AssigneeKohjin Co., Ltd.
InventorsTeiichi Murayama, Takashi Maruyama
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AssigneeKohjin Co., Ltd.
InventorsTeiichi Murayama, Takashi Maruyama
Estimating the term…
A temperature sensitive water absorbing and discharging polymer composition having a predetermined selected temperature sensing point, which controls water absorbability, is obtained by polymerizing in an aqueous solution N-alkyl acrylamide derivatives with acrylic acid, alkali metal salts of acrylic acid or mixtures thereof, and diacetone acrylamide. The temperature sensitive water absorbing and water discharging polymer composition is modified to control the temperature sensing point and has a high water discharging and absorbing property above and below the temperature sensing point. The composition is utilized in a wide variety of sanitary materials such as paper diapers, soil improvers in agricultural and horticultural fields for plants and vegetables such as soil water supplying agents or soil water retaining agents, water proof sealing materials, sandbags, temperature sensors, chemical valves, solid-liquid separation materials and liquid concentrating materials.
A temperature sensitive water absorbing and discharging polymer composition, comprising in an aqueous solution, a copolymer of N-alkyl acrylamide derivatives with acrylic acid, alkali metal salts of acrylic acid or mixtures thereof, said composition further comprising diacetone acrylamide, wherein said N-alkyl acrylamide derivatives are N-isopropyl acrylamide, N-N-diethyl acrylamide, or mixtures thereof.
A method for producing a temperature sensitive water absorbing and discharging polymer composition, comprising copolymerizing in an aqueous solution at least one N-alkyl acrylamide derivative with at least one member selected form the group consisting of acrylic acid, alkali metal salts of acrylic acid and mixtures thereof, said solution further comprising diacetone acrylamide, wherein said N-alkyl acrylamide derivatives are N-isopropyl acrylamide, N-N-diethyl acrylamide, or mixtures thereof.
Dependencies are inferred from the claim text.