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US 4,524,102 AGranted
Microcellular polyurethane foams having integral skin
OwnerFritz Hostettlerinventor
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OwnerFritz Hostettlerinventor
Estimating the term…
There are provided a wide range of polyurethane products, e.g., cellular, dense elastomer, and integral skin microcellular products, obtained by the reaction of (a) a polyisocyanate compound, (b) a polyol, (c) optionally a chain extender and/or blowing agent with/without other known additives, (d) in the presence of a non-hydroxyl flow modifier characterized by carbon and hydrogen atoms, at least one and, generally, a plurality of oxyalkylene groups, and at least one urethane, ##STR1## group. Several of the polyurethane products exhibit unique properties, e.g., foamed articles with capability to conduct static electricity, soft elastomers characterized by improved coefficient of friction, etc. Several classes of the flow modifiers are novel per se. The polyurethane products can be synthesized via the one shot or prepolymer process. Multipackage systems, in particular, two and three component systems are useful in molding operations, e.g., manufacture of shoe soles.
A polyurethane product prepared by reacting a mixture comprising (a) a polyol having a molecular weight in the range of from about 1800 to about 10,000, (b) an organic polyisocyanate, (c) optionally, a chain extender, and (d) a catalyst for accelerating the NCO/active hydrogen reaction, in the presence of (e) a blowing agent and (f) from about 5 to about 50 parts by weight, per 100 parts by weight of said polyol, of a non-hydroxyl flow modifier, said flow modifier having the following characteristics:
A microcellular polyester polyurethane elastomer characterized by cell diameters of from about 0.3 to 0.01 mm, a density of from 160 to 900 kg/m.sup.3, and good low temperature flex property determined in accordance with ASTM D-1052, prepared by reacting a mixture comprising (a) a polyester polyol having a molecular weight in the range of from about 1800 to about 10,000, (b) an organic polyisocyanate, (c) a chain extender, and (d) a catalyst for accelerating the NCO/active hydrogen reaction, in the presence of (e) an organic blowing agent as the primary blowing agent, and (f) from about 5 to about 35 parts by weight, per 100 parts by weight of said polyester polyol, of a non-hydroxyl flow modifier, said flow modifier having the following characteristics:
Dependencies are inferred from the claim text.