| 摘要 |
The present invention refers to polyurethane aqueous dispersions having a resin solids content of 20 to 60 percent by weight, a viscosity at 23 degree C from 10 to 20,000 mPa's and a pH from 5,5 to 8.5, wherein polyurethane has an average molecular weight by weight of 5,000 to 500,000, and a urethane groups content (calculated as -NHCO-O- molecular weight = 59) of 2.5 to 25 percent by weight, and is based on a polyisocyanate compound containing 50 to 100 percent by weight of 1-methyl-2,4- and/or -2,6-diisocyanatecyclohexane. The present invention also refers to aqueous binding compositions containing these aqueous polyurethane dispersions and known crosslinking resins, and to aqueous binding compositions as binders for glass fiber preparations.
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