Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1978-09-29
1979-11-27
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
428524, 521105, 521120, 521136, 521181, 521907, 528138, 528141, 528143, 528165, C08J 914, C08L 6108, C08L 6110
Patent
active
041762169
ABSTRACT:
The present invention provides particular phenol/formaldehyde resoles which are especially useful as foamable 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 relationship 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.
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Atkins Kenneth E.
Reid Wallace G.
Saini Rakesh
Foelak Morton
Klosty Marylin
Union Carbide Corporation
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