Preparation of isocyanate terminated prepolymer

Details Preparation of isocyanate terminated prepolymer Preparation of isocyanate terminated prepolymer

1974-09-26

1976-01-20

Czaja, Donald E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 75NE, 260 775AA, C08G 1808, C08K 501

Patent

active

039337251

ABSTRACT:
In accordance with a preferred embodiment of this invention, a polyether-type, isocyanate-terminated, polyurethane prepolymer is formed by (1) blending about one equivalent of diphenylmethane diisocyanate (hereinafter "MDI") and a mixture of from about 0.5 to about 0.55 equivalent of a polyoxypropylene diol having a molecular weight (Mn) within the range of about 1,000 to about 2,000, from about 0.08 to about 0.13 equivalent of a polyoxypropylene trio, having a molecular weight (Mn) in the range of from about 4,000 to about 4,500, and from about 10 to about 15 parts by weight of a hydrogenated terphenyl plasticizer per 100 parts by weight of the mixture of MDI and the polyols, (2) initiating the polymerization reaction by adding from about 0.08 to about 0.12 parts by weight of a tin catalyst per about 250 parts by weight of MDI; the catalyst being initially dissolved in from about 10 to about 15 parts by weight of additional hydrogenated terphenyl plasticizer per about 100 parts of the mixture of MDI and polyols. This process yields a thermally stable prepolymer, which is suitable for many applications, and the required reaction time may be as low as one minute. This represents a significant improvement over the prior art.

REFERENCES:
patent: 3707521 (1972-12-01), De Santis
patent: 3711445 (1973-01-01), Chu et al.
patent: 3779794 (1973-12-01), De Santis

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