Urea-modified isocyanurates and method of making rigid foams the

Details Urea-modified isocyanurates and method of making rigid foams the Urea-modified isocyanurates and method of making rigid foams the

1991-12-26

1993-06-29

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521902, 521131, C08G 1832

Patent

active

052235513

ABSTRACT:
Rigid urea-modified polyisocyanurate foams with improved dimensional stability and flame retardancy have densities of 1-12 p.c.f., a limiting oxygen index greater than 22 and dimensional changes at 100% R.H. and 70.degree. C. of less than 2% in any linear dimension and a method of making same. The method comprises reacting an organic polyisocyanate, a blowing agent and an N,N'-dialkyl aromatic diamine in the presence of a trimerization catalyst and, if water is used as the blowing agent, a blowing catalyst, wherein the N,N'-dialkyl aromatic diamine and an amine produced by water, if used, constitute the sole sources of active hydrogen.

REFERENCES:
patent: 3909465 (1975-09-01), Wiedermann et al.
patent: 4425446 (1984-01-01), Malwitz et al.
patent: 4578446 (1986-03-01), House et al.
patent: 4801674 (1989-01-01), Scott, Jr. et al.
Ashida, Polyisocyanurate Foams, Chap. 6, The Handbook of Polymeric Foams and Foam Technology, edited by D. Klempner and K. C. Frisch, Hauser Publishers, 1991, p. 96.
Ashida, ibid. pp. 97-98.
Gattuso et al., Secondary Amine Extended Flexible Polyurethane-Area Foams, Polyurethanes 88, Proceedings of the S.P.I. 31st Annual Technical/Marketing Conference, Oct. 19-21, 1988.

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