摘要:
A process for making a thermoplastic polyurethane material comprising the steps of casting an NCO-terminated prepolymer with 1,4-butanediol to form a casting composition; extruding the casting composition to form at least one strand of a polyurethane elastomer; pelletizing the at least one strand of said polyurethane elastomer to form at least one pellet; and processing the at least one pellet to form a thermoplastic article.
摘要:
A hydrophobic polyurethane elastomer is disclosed comprising an isocyanate terminated prepolymer comprising: i) from 30 to 90 percent by weight of an OH terminated homopolymer of butadiene having molecular weight ranging from 1000 to 4000 and an OH functionality of from 1.9 to 2.1; ii) from 10 to 70 percent by weight of an isocyanate and an asymmetric diol chain extender having a molecular weight ranging from 75 to 200.
摘要:
A hydrophobic polyurethane elastomer is disclosed comprising an isocyanate terminated prepolymer having an isocyanate content ranging from 4 to 12 wt. % NCO comprising the reaction product of: i) an OH terminated homopolymer of butadiene having molecular weight ranging from 1000 to 4000 and an OH functionality of from 1.9 to 2.1; ii) an aliphatic or cycloaliphatic diisocyanate; and a diol chain extender having a molecular weight ranging from 62 to 400.
摘要:
A di-hydroxy-functionalized linear non-crosslinked polyolefin is disclosed having no pendant chain-branched groups which is prepared by reacting 1,4-diacetoxy-2-butene with 1,5-cyclooctadiene in the presence of a catalyst comprising a ruthenium metal carbene complex, characterized in that the functionality number of said polyolefin as determined by NMR is 2.0 and the viscosity of said polyolefin ranges from about 800 to 16000 mPa.s @25.degree. C. at a number average molecular weight ranging from 2,600 to 6,500 g/mole. A prepolymer comprising the reaction of a polyisocyanate with the polyolefin is also disclosed.
摘要:
Group 4 metal-containing organosilicon dendrimers are described. Also described are methods for synthesizing the dendrimers. The dendrimers can be useful in several applications including as olefin polymerization and copolymerization catalysts and as silane polymerization catalysts.