Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1987-12-11
1988-11-29
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521107, 521108, 521121, 521128, 521129, 521131, 521156, 528 48, 528 49, 528 51, 528 53, 528 59, C08G 1814
Patent
active
047882247
ABSTRACT:
Molded articles are produced in a two-stage process. In the first stage, an organic polyisocyanate is reacted with an organic compound containing at least two epoxide groups (NCO: epoxide equivalent ratio of 1.2:1 to 500:1) in the presence of a tertiary amine catalyst. This reaction is stopped when no more than 65% of the isocyanate groups have reacted by adding an alkylating sulfonic acid alkyl ester of methyl iodide and/or of dimethyl sulfate in an amount equivalent to the amount of tertiary amine catalyst present. A latent catalyst capable of being activated by heat is subsequently added to the intermediate product and the resultant mixture is heated in a mold to complete the crosslinking of the intermediate product and to form the molded article.
REFERENCES:
patent: 4564651 (1986-01-01), Markert et al.
patent: 4582723 (1986-04-01), Markert et al.
patent: 4728676 (1988-03-01), Muller et al.
W. Siefken in Justus Liebigs Annalen der Chemie, vol. 562, pp. 75-109, 1948.
Heine Heinrich
Muller Hanns P.
Uerdingen Walter
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Welsh Maurice J.
Whalen Lyndanne M.
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