Method for accelerating cure of resole type phenolic resins
AssigneeSumitomo Durez Company, Ltd.
InventorsYukio Saeki, Katsuyuki Tanaka
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Abstract
The cure of resin compositions comprising a mixture of a resole type phenol aldehyde resin and a novolac type phenol formaldehyde resin is improved by employing resorcinol as all or part of the phenolic component in the novolac type resin. The resin compositions are particularly useful as binders for foundry sand.
Claims7
A resin composition comprising a phenol-aldehyde resole resin that is solid at ambient temperature, and about 0.3 to 20 parts by weight of a phenol-aldehyde novolac resin that is solid at ambient temperature based upon 100 parts by weight of said resole resin, wherein about 50 to 100 percent of the phenolic component of said novolac resin is resorcinol.
Dependencies are inferred from the claim text.