Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1978-08-11
1980-04-08
Woodberry, Edward M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528129, 528205, 528249, 525480, 525503, C08G 828
Patent
active
041973852
ABSTRACT:
A resin for coating sand and a resin-coated sand produced therefrom wherein the resin is prepared by incorporating furan into a phenolic novolak resin. In the preferred practice, the resin is produced by reaction of furfuryl alcohol with a phenolic compound at an acid pH to give a furfuryl-phenolic intermediate in a first step, and then, in a second step, reacting the furfuryl-phenolic intermediate with a lower aliphatic aldehyde to produce the resin. The resin-coated sands of the present invention provide unexpectedly improved shakeout and collapsibility characteristics in the shell process.
REFERENCES:
patent: 2321493 (1943-06-01), Korten
patent: 2453704 (1948-11-01), Dunlop et al.
patent: 2456628 (1948-12-01), Dunlop et al.
patent: 3024215 (1962-03-01), Freeman et al.
patent: 3312650 (1967-04-01), Case et al.
patent: 3549584 (1970-12-01), Sekera
patent: 4051301 (1977-09-01), Laitar
Furfurylated Novolak Resins, Ind. Eng. Chem. 50, 1675-1676(1958), Brown et al.
CPC International Inc.
Parmerter Stanley M.
Woodberry Edward M.
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