Hydrophilic and thermoreactive urethane compositions with improv

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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156331, 260 775AM, 428425, C08G 1806

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active

040395170

ABSTRACT:
A hydrophilic and thermoreactive urethane composition having improved properties such as stability in solution, non-tackiness, water resistance and strength and useful in treating and finishing fibrous products prepared by forming a urethane prepolymer containing free isocyanate groups from (a) (1) a compound containing at least 2 active hydrogen atoms, containing an oxyethylene chain, and having a molecular weight of about 200 to 20,000, or (2) a compound containing at least 2 active hydrogen atoms, not containing an oxyethylene chain, and having a molecular weight of about 200 to 20,000 and a compound containing at least 2 active hydrogen atoms, containing an oxyethylene chain and having a molecular weight of about 200 to 200,000; and (b) an excess of a polyisocyanate; and if desired, (c) a chain extender containing at least 2 active hydrogen atoms; whereby the prepolymer has an oxyethylene chain content of 10 to 40% by weight, and then reacting the prepolymer or a solution thereof with not more than 3 times the equivalent of the free isocyanate groups in the prepolymer of an aqueous solution of a bisulfite salt having a concentration of at least 15% by weight. Where the urethane prepolymer contains at least 1% by weight ester groups, the hydrophilic and thermoreactive urethane composition is particularly valuable as a high strength adhesive composition and is useful as an adhesive in bonding a sheet-like material as a top-coat to a fabric as a base in producing an artificial leather.

REFERENCES:
patent: 2746988 (1956-05-01), Doser
patent: 3438940 (1969-04-01), Keberle et al.
patent: 3898197 (1975-08-01), Guise et al.

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