Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1986-08-04
1987-07-21
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
252182, 521164, 521902, 528 81, 528 85, 560196, C08G 1814
Patent
active
046819037
ABSTRACT:
Polyester polyols corresponding to the formula ##STR1## in which R.sub.1, Z, x, A.sub.1, A.sub.2, A.sub.3, A.sub.4, A.sub.5, A.sub.6, A.sub.7 and A.sub.8 each represent specified groups or values are made by reacting (a) a dicarboxylic acid or derivative thereof or anhydride thereof with (b) a tris-alkanolamine and/or tetrakis-alkanol diamine. These polyester polyols are particularly useful in the production of polyurethane and polyisocyanurate foams.
REFERENCES:
patent: 2831813 (1958-04-01), Matuszak et al.
patent: 3927073 (1975-12-01), Sundby
Giersig Manfred
Haas Peter
Sommerfeld Claus-Dieter
Weber Hans-Ulrich
Wiedermann Rolf
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Welsh Maurice J.
Whalen Lyndanne M.
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