Sealants made using low unsaturation polyoxyalkylene polyether p

Details Sealants made using low unsaturation polyoxyalkylene polyether p Sealants made using low unsaturation polyoxyalkylene polyether p

1996-11-21

2000-08-15

Wilson, Donald R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 65, 528 85, 528409, 528413, 528419, 525409, 568620, 568624, C08G 1806, C08G 1848

Patent

active

061038504

ABSTRACT:
There is provided an sealant made with an isocyanate or hydroxyl terminated prepolymer made by reacting a stoichiometric excess of an organic polyisocyanate with polyols made of at least a polyoxyalkylene polyether triol or a mixture thereof with a polyoxyalkylene polyether diol. The triol or diol has within its structure the nucleus of an initiator compound, an internal blocks of oxypropylene groups, and external blocks of oxyalkylene groups, wherein the internal blocks of oxypropylene are between said nucleus and said external blocks, said external blocks are made of oxyalkylene groups derived from a C.sub.4 or higher alkylene oxide. The amount of the internal blocks of oxypropylene groups is from 25 weight percent to 80 weight percent based on the weight of all oxyalkylene groups and initiator in the prepolymer The triol or diol has a compatibility index of 25.degree. C. or less, and may be part of a two component or a one component moisture cured sealant.

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Encyclopedia of Polymer Science and Engineering, vol. 6, 2nd Edition, Copyright 1986-1,2-Epoxide Polymers.

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