Reaction system for producing a polyurethane and method of using

Details Reaction system for producing a polyurethane and method of using Reaction system for producing a polyurethane and method of using

1994-12-29

1996-12-24

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 48, 528 49, 528 85, 528374, 528503, 521121, 521124, 427290, 427379, 4273855, 4273897, 4274072, 427409, 502152, 502155, 502156, 502168, 502216, 502246, 502249, 502353, C08G 1808, C08G 1822

Patent

active

055874487

ABSTRACT:
This invention concerns a reaction system for producing a polyurethane having an isocyanate index value of at least 100, and a catalyzed reaction mixture thereof, having a gel time between 5 and 60 minutes. The reaction system, in one aspect, involves a mixture of first and second parts that are located in separate containers, respectively, which are effective to prevent contact between said first and second parts thereof until coating or sealing application is desired. This two-part reaction system includes:(a) a first part comprising a polyisocyanate component; b) a second part comprising: (i) a polyol component; (ii) a polyurethane catalyst comprising a bismuth/zinc polyurethane catalyst; and (iii) a molar excess of a complexing agent for the polyurethane catalyst, where the complexing agent is a mercaptan compound. This invention also concerns a method of forming a polyurethane sealant on a surface using the two-part reaction system and catalyzed reaction mixture.

REFERENCES:
patent: 3074544 (1963-01-01), Bollmeier et al.
patent: 4788083 (1988-11-01), Dammann et al.
patent: 5011902 (1996-04-01), Foucht
patent: 5250651 (1993-10-01), Price
Ephraim et al., "Kinetic Studies of the Reaction of Phenyl Isocyanate . . . in various Solvents", Abstract of Thesis of S. Ephraim, vol. 80, Oct. 16, 1957, pp. 1326-1328.
Britain et al., "Catalysis of the Isocyanate-Hydroxyl Reaction", J. Appl. Polymer Sci., vol. IV, Issue No. 11, (1960), pp. 207-211.
Leckert et al., "New Catalyst for Two Component Elastomer Systems", Polyurethanes World Congress, 1987-Sep. 29-Oct. 2, 1987, pp. 351-355.
J. Arenivar and Kurt C. Frisch et al., "Metal Carboxylates for Urethanes", Paper presented at UTECH '92, pp. 1-10.
Robins, J., "Metal Ion Catalysis in Mercaptan Isocyanate Reactions", Advances in Urethane Science Technology, vol. 12, Technonmic Publ. Co., Lancaster PA, (1993) pp. 25-58.

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