New resols phenol / formaldehyde and their application to the production of cellular products

摘要

P the present invention relates to resols of condensation of phenol and formaldehyde and to cell of the phenolic products obtained from these resols. / p & & p & the resols of the invention have a specific relationship between their viscosity and their water content, expressed by the area delimited by certain points on a curve of variation of their viscosity in logarithmic scale as a function of their water content, this area depends on the molar ratio of formaldehyde: phenol, in which the resol has been condensed. The resols are capable of giving a phenolic foam, the possibility of implementation is acceptable, the specific weight ranges from approximately 30,4 to approximately 59,2 g / d * * 3 and, in this range of specific weight, there is a good balance between the resistance to erosion and the resistance to compression. / p & & p & application to the production of phenolic foams are intended to the building industry. / p