| 摘要 |
A process for producing a fluid curable, polyurethane composition comprises reacting together stepwise or simultaneously at temperatures of 25 DEG to 100 DEG C. and under substantially anhydrous conditions (a) at least one organic diisocyanate, (b) at least one polyether glycol (a polyalkylene-ether glycol, polyalkylene-aryleneether glycol, polyalkyleneether-thioether glycol or polyalkylene-aryleneether-thioether glycol) with a molecular weight of 900 to 2500, and (c) a low molecular weight glycol of molecular weight not more than 350 until substantially all the hydroxyl groups have reacted, the overall molar ratio of polyether glycol to low molecular weight glycol being 1:0,5 to 1:3 and that of diisocyanate to total glycol being 1,5:1 to 2,0:1. Lists of suitable reactants are given. Glycols specified for (c) include compounds having phenyl, cyclohexane or cyclohexene rings, ether groups and ethylenic links. The fluid compositions can be cured by reaction with an arylene diprimary amine having a pKb value of at least 9,70 or an organic polyhydroxy compound or both. Amines specified are 4, 41-methylene-bis-(2-chloroaniline), 4, 41-methylene bis (2-carbomethoxyaniline), 4, 41-diaminodiphenyl sulphide, 4, 41-diaminodiphenylsulphone, 4, 41-methylene-dianiline and 4, 41-methylene-bis (2-methoxy, 2-methyl or 3-bromoanilines). Polyhydroxy compounds include those employed as reactant (c) and also various triols, triethanol-amine, tripropanolamine and N, N, N1, N1-tetrakis-(2-hydroxyethyl) ethylenediamine. Examples describe the preparation of fluid compositions and their curing, the reactants employed being (1) and (2) polytetramethyleneether glycol, 1, 4-butane diol, toluene-2, 4-diisocyanate and 4, 41-methylene-bis-(2-chloroaniline); (3) polypropyleneether glycol and other reactants as in (1); (4) as in (1) except that the glycol is ethylene glycol, 1, 3-butane glycol, 1, 5-pentane diol, 1, 6-hexane diol, 1, 10-decane diol or 2, 5-di-(hydroxymethyl)-tetrahydrofuran; (6) as in (1), except that mixed 1, 4-butane diol and trimethylol propane with phenthiazine as antioxidant is used in the curing. Specification 733,624 is referred to.
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