Method of producing novolak resin

Details Method of producing novolak resin Method of producing novolak resin

2005-01-19

2008-03-18

Truong, Duc (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C528S144000, C528S486000, C528S500000, C528S501000, C528S50200C, C528S503000

Reexamination Certificate

active

07345132

ABSTRACT:
Provided an industrially excellent method of producing a phenol novolak resin having an ortho ratio of 30% or more by: (1) a method of reacting a phenol and an aldehyde using an oxalic acid catalyst at 110 to 160° C. under pressure; or (2) a method of reacting a phenol and an aldehyde under pressure while removing the heat of reaction by a condenser with controlling a pressure so that water or an organic solvent present in the reaction system is refluxed.

REFERENCES:
patent: 4876324 (1989-10-01), Nakano et al.
patent: 6045966 (2000-04-01), Rahman et al.
patent: 6121412 (2000-09-01), Wanat et al.
patent: 2000-264941 (2000-09-01), None
Casiraghi, Giovanni, et al., Uncatalysed Phenol-Formaldehyde Reactions—A Convenient Synthesis of All-orthoNovolac Resins, Makromol. Chem., 1981, 2973-2979, 182.

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