C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/66 (2006.01) C07C 269/02 (2006.01) C07C 271/28 (2006.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) C08L 75/08 (2006.01)
Patent
CA 2046509
ABSTRACT OF THE DISCLOSURE A urethane prepolymer composition useful as sealant is disclosed. The composition comprises a reaction product of an organic polyisocyanate and a polyether polyol mixture at an NCO/OH equivalent ratio from 1.6 to 2.5. The polyether polyol mixture contains (a) from 75 to 95 % by weight of the mixture of a polyoxyalkylenediol having an average MW from 400 to 1,000 and are oxyethlene unit content greater than 50 % by weight, and (b) the balance of the mixture of a polyoxyalkylenetriol having an average MW from 5,000 to 10,000 and an oxyethylene unit content greater than 50 % by weight. An equivalent composition is produced by reacting the polyoxyalkylenediol and polyoxyalkylenetriol with the organic polyisocyanate separately and mixing together after the reaction.
Sano Takashi
Uchikata Hidehiro
Dai-Ichi Kogyo Seiyaku Co. Ltd.
G. Ronald Bell & Associates
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