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Process for casting polyurethane articles
T101303 Process for casting polyurethane articles
Patent Drawings:

Inventor: O'Shaughnessy
Date Issued: December 1, 1981
Application: 06/239,187
Filed: March 2, 1981
Inventors: O'Shaughnessy; Francis (Beaumont, TX)
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney Or Agent:
U.S. Class: 264/102; 264/28; 264/331.19; 528/44
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Abstract: A mixture of isocyanate-terminated polyurethane prepolymer made from an aliphatic diisocyanate and an approximately stoichiometric amount of a curing aromatic diamine is stored at least -5.degree. to -25.degree. C. until needed. It then is reheated to about 80.degree.-120.degree. C., at which temperature it becomes fluid and pourable. Within this temperature range the mixture has a useful life of at least about 30 minutes. Large batches of prepolymer-curing agent mixture can be prepared using existing processing equipment and techniques, analyzed and stored, then reheated and used for casting of very large articles.
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Description:
 
 
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