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AssigneeDow Global Technologies LLC
InventorsMikhail Y. Gelfer, Amber Stephenson, Venkat S. Minnikanti, Mark Brown, II, Mark R. Whelan, Arjun A Raghuraman
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Syntactic polyurethane elastomers are made using a non-mercury catalyst. The elastomer is made from a reaction mixture containing a polyether polyol, a chain extender, a polyisocyanate and microspheres. The elastomer is characterized morphologically by the presence of small discrete morphological domains 0.1 to 3 μm in diameter, and the substantial absence of discrete morphological domains 5 to 30 μm in diameter. The elastomer adheres well to itself, which makes it very useful as thermal insulation for pipelines and other structures that have a complex geometry.
A cured syntactic polyurethane elastomer in which gas filled microspheres are dispersed in a noncellular polyurethane matrix, wherein the syntactic polyurethane elastomer is a reaction product of at least one polyether polyol having a number average hydroxyl equivalent weight of at least 800, 5 to 50 weight percent of microspheres based on the total weight of the reaction mixture, 1 to 30 parts by weight of a hydroxyl-terminated chain extender per 100 parts by weight of the polyether polyol(s), an aromatic polyisocyanate in amount to provide an isocyanate index of 80 to 130 and a non-mercury catalyst, wherein the reaction mixture is devoid of mercury compounds and the noncellular polyurethane matrix has a morphology characterized by the presence of small discrete morphological domains 0.1 to 3 μm in diameter, and the absence of discrete morphological domains 5 to 30 μm in diameter.
A cured syntactic polyurethane elastomer in which gas filled microspheres are dispersed in a noncellular polyurethane matrix, which syntactic polyurethane elastomer is a reaction product of at least one polyether polyol having a number average hydroxyl equivalent weight of at least 800, 5 to 50 weight percent of microspheres based on the total weight of the reaction mixture, 1 to 30 parts by weight of a hydroxyl-terminated chain extender per 100 parts by weight of the polyether polyol(s), an aromatic polyisocyanate in amount to provide an isocyanate index of 80 to 130 and catalytic amount of a zinc carboxylate or a mixture of a zinc carboxylate and another metal catalyst of which mixture the zinc carboxylate constitutes at least 99.9 weight percent, wherein the reaction mixture is devoid of mercury compounds.
A coated substrate having multiple sections of an applied syntactic polyurethane elastomer in which gas filled microspheres are dispersed in a noncellular polyurethane matrix, the multiple sections being in contact with each other at one or more bondlines, comprising
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