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Keyframe.Animation.1.6.2.with.Serial





Keyframe.Animation.1.6.2.with.Serial









Keyframe.Animation.1.6.2.with.Serial


Category:Animation software Category:Software using the Qt toolkitThis invention relates to a process for the preparation of a catalyst for the production of polyurethanes. In a particular embodiment, this invention relates to a process for the preparation of a catalyst for the production of polyurethanes which contains a polyol having a molecular weight of less than 1000. The preparation of polyurethanes by the reaction of a polyisocyanate with an organic compound having active hydrogen atoms is well known. The reaction may be conducted in various organic solvents, with water being the most common. The polyisocyanate reacts with the active hydrogen-containing compounds and a blowing agent to form a polyurethane which remains in the polyurethane polyol phase. This polyurethane polyol is then reacted with a polyisocyanate to form a polyurethane elastomer. The general preparative procedure for the production of the catalyst which is present in the polyurethane polyol is to react an alkanolamine with an alkyl toluene sulfonic acid to form a tertiary amine which is then quaternized with a tertiary amine, such as methyl chloride or dimethyl sulfate. Polyisocyanates employed in the production of polyurethane polyols vary widely. The most common polyisocyanates are the aromatic polyisocyanates, such as toluene diisocyanate and 4,4'-methylene-bis-(phenyl isocyanate). Aliphatic polyisocyanates include butyl isocyanate, hexamethylene diisocyanate, and isophorone diisocyanate. Polyisocyanates containing carbodiimide groups, as disclosed in U.S. Pat. No. 3,919,056, may also be employed. The production of aromatic polyisocyanates is well known. The most common aromatic polyisocyanates are those derived from toluene or xylene diamines and toluene or xylene diisocyanates. Other polyisocyanates that are commonly employed are m- and p-phenylene diisocyanate, 1,6-hexamethylene diisocyanate, 1-methyltrimethylene diisocyanate and cyclohexane-1,4-diisocyanate.









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Keyframe.Animation.1.6.2.with.Serial

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