C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/40, 403/54
C08G 8/10 (2006.01) C08J 9/14 (2006.01)
Patent
CA 1121938
ABSTRACT OF THE DISCLOSURE The present invention provides particular phenol/formaldehyde resoles which are especially useful as formable resins, and further provides cellular phenolic products having physical properties which are especially attractive for end-use application as construction foam. The resoles are characterized by a particular relation- ship between their viscosity and water content, expressed as the area bounded by certain points on a plot of resole viscosity on a logarithmic scale, as a function of water content of the resole, the particular area depending upon the mole ratio of formaldehyde-to-phenol at which the resole has been condensed. It has been found that phenol-formaldehyde resoles having the defined viscosity/water relationship are capable of providing phenolic foam having acceptable foam processability, a foam density from about 1.90 to about 3.70 pounds per cubic foot and, within this foam density range, a good balance of friability resistance and compressive strength. that is, a friability of less than 35 percent weight loss and a compressive strength of at least 20 pounds per square inch. Preferred resoles within the invention are foamable to phenolic foam having a reduced tendency to punk as well as the aforementioned desirable combination of foam processability and mechanical properties.
307590
Atkins Kenneth E.
Reid Wallace G.
Saini Rakesh
Hopley William G.
Union Carbide Corporation
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