Wallace G Reid

US Patent:

41761065, Nov 27, 1979

Filed:

Jul 28, 1977

Appl. No.:

5/820020

Inventors:

Wallace G. Reid - Katonah NY
Rakesh Saini - Somerville NJ
Kenneth E. Atkins - South Charleston WV

Assignee:

Union Carbide Corporation - New York NY

International Classification:

C08L 6108
C08L 6110

US Classification:

260 293

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.

US Patent:

41762169, Nov 27, 1979

Filed:

Sep 29, 1978

Appl. No.:

5/947340

Inventors:

Wallace G. Reid - Katonah NY
Rakesh Saini - Somerville NJ
Kenneth E. Atkins - South Charleston WV

Assignee:

Union Carbide Corporation - New York NY

International Classification:

C08J 914
C08L 6108
C08L 6110

US Classification:

521106

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.