Claims
- 1. A composition for the preparation of foamed structures by frothing with a aqueous surfactant-hardener solution comprising a phenol-urea-formaldehyde condensation product in which the phenol is present in the amount of from about 1 to about 20 percent by weight, the urea is present in the amount of from about 23 to about 48 percent by weight and the formaldehyde is present in the amount of from about 42 to about 70 percent by weight, the ratio of formaldehyde to urea being in the range of from about 1 to about 3 parts formaldehyde to about 1 part urea, said condensation product having a viscosity at room temperature in the range of about 30 to about 36 seconds on a No. 1 Zahn cup and a pH maintained in the range of from about 6 to about 8.
- 2. The composition of claim 1 in which the phenol is present in the amount of about 2 percent by weight.
- 3. The composition of claim 1 in which the phenol is present in the amount of about 15 percent by weight.
Parent Case Info
This is a continuation of application Ser. No. 497,738 filed Aug. 15, 1974 now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
256711 |
Aug 1926 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
497738 |
Aug 1974 |
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