Polyurethane rim system

Details Polyurethane rim system Polyurethane rim system

B - Operations, Transporting

29

C

18/715

B29C 45/18 (2006.01) B29B 7/76 (2006.01) B29C 31/06 (2006.01) C08G 18/65 (2006.01)

Patent

CA 1200064

ABSTRACT OF THE DISCLOSURE A polyurethane RIM system has at least two molding stations. The reactants are brought to the mixheads as three separate streams. One stream contains the isocyanate, the second stream contains some of the polyol, the chain extender and crosslinker and a third stream contains additional amounts of the polyol, along with what additives might be desired. At each mixhead the proportions of ingredients are controlled to give an isocyanate index of about 100, but the ratio of one polyol stream to the other is regulated to con- trol the flex modulus and other properties of the molded product as may be desired. In this way, one source of supply can be used to feed several molding stations, each of which may produce a product of different physical properties and thus of different costs.

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