Manufacture of polyurethane foam

Details Manufacture of polyurethane foam Manufacture of polyurethane foam

1988-09-21

1990-04-10

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521172, 521173, 521174, 521176, C08G 1814

Patent

active

049161687

ABSTRACT:
Flexible polyurethane foam based on methylene diphenyl isocyanates and isocyanate-reactive compounds selected from polyols and polyamines, for which the ratio of the density expressed in kg/m.sup.3 to the compression hardness at 40% compression, expressed in kPa, has a value of at least 20.
Such foams may be obtained through a process which comprises reacting methylene diphenyl isocyanates with one or more isocyanate-reactive compounds selected from polyols and polyamines with a functionality of 2-4 and an average equivalent weight ranging from 750-5000 and from 0 to 5 parts by weight of water per 100 parts of polyols and/or polyamine, optionally together with additives conventional in the art, and optionally together with blowing agents other than water, whereas the isocyanate index ranges from 10 to 60.

REFERENCES:
patent: 3591532 (1971-06-01), Abercrombie et al.
Patent Abstracts of Japan, vol. 7, No. 7 (C-144) [1552], Jan. 12, 1983.
FR-A-2181987 (Scott Paper) p. 5, line 1-p. 7, line 9; p. 10 lines 12-31; claim 1.
Journal of Cellular Plastics, vol. 20, No. 4, Jul./Aug. 1984, Technomic Publishing Co., Inc., C. J. Reichel et al: "Flexible Polyurethane Molded Foams Based on MDI" *p. 286, FIG. 3; p. 286, right-hand column, paragraph 2.

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