Phenol-formaldehyde resin having low concentration of tetradimer
AssigneeGeorgia-Pacific Chemicals LLC
InventorsRamji Srinivasan, Kim Tutin, James Knight, Paul Baxter
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Abstract
A phenol-formaldehyde resin, having a low concentration of tetradimer, making the resin suitable for preparing a binder composition for making non-woven fiber products, such as fiberglass insulation, prepared by reacting phenol and formaldehyde in the presence of a sulfite source.
Claims21
A method of making a phenol-formaldehyde resin suitable for use in preparing a binder composition where a molar excess of formaldehyde (F) is reacted with a phenol component (P), the method comprising reacting formaldehyde (F) with the phenol component (P) under an alkaline condition in the presence of a sulfite source, the sulfite source being present in an amount to provide 0.02 to 0.6 mole sulfite per mole of phenol.
Dependencies are inferred from the claim text.