Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1982-01-04
1983-06-28
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521126, 521127, 521131, 521136, 521177, C08G 1832, C08J 900
Patent
active
043906419
ABSTRACT:
A method of preparing a flame-retardant benzylic-ether phenolic modified foam product and the resulting foam product produced thereby, which method comprises reacting and mixing benzylic-ether phenol-formaldehyde resin, having a hydroxyl number of from about 400 to 600, with from about 50 to 150 parts by weight of a boric-acid catalyst to each 100 parts of the resin, optionally in the presence of melamine, to form a resin prepolymer, and, thereafter, reacting the prepolymer so formed, in the presence of a blowing agent and an organometal catalyst, with a methylene diisocyanate in an exothermic reaction, to provide a nonfriable, substantially closed-cell, flame-retardant benzylic-ether phenolic modified foam product characterized by substantially acid methylene linkages in the resulting thermosetting foam product.
REFERENCES:
patent: 2608536 (1952-08-01), Sterling
patent: 3242107 (1966-03-01), Bunge et al.
patent: 3485797 (1969-12-01), Robbins
patent: 4046721 (1977-09-01), Austin et al.
Crowley Richard P.
Foelak Morton
Thermocell Development Ltd.
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