This phenol resin is called novolac resin.
Infrared Spectra of Phenol-Formaldehyde Resin
In a broader aspect, the invention is not limited to the addition of any specific number nefrologia solvent to the molten resin before its transformation into a chilled her solid form. Basically, enough nefrologia solvent is added so that the solid Novolac resin showed a melt viscosity that is close to the melt viscosity of the resin with the original higher level of free phenol, usually not more than about 30% higher than the initial viscosity of the melt, preferably not more than about 25% higher than the initial viscosity of the melt, and usually not more than about 20% higher than the initial viscosity of the melt. If the resin had a melt viscosity of 3000 cps at 4% (by weight) of free phenol, and after removal of phenol to 1.0% (by weight)is added enough nefrologia solvent (approximately 2 - 3%)to bring the viscosity back to 3000 cps or lower at 1% (by weight) level of free phenol. Basically enough nefrologia solvent is added so that the solid Novolac resin showed a melt viscosity of not more than about 10% higher than the initial viscosity of the melt.
of a standard phenol novolac resin is between 250 and 900.
The number nefrologia solvent to be added to any particular Novolac resin can be easily determined using conventional experiment. Usually the amount of from about 1 to 8% by weight should be suitable in most cases, and the number from 2 to 6%is probably typical. The number nephrolog the solvent to add to a certain extent dictated by the specific nephanalysis solvent, selected for use, and the properties of the melt, which want to give the subsequent molten form of solid resin.
Patent US3244671 - Production of phenolic novolac …
1. The binder composition of the solid Novolac resin containing less than 1.5% of free phenol and a sufficient number nefrologia solvent so that the solid Novolac resin exhibits a melt viscosity at 150°C in less than 5000 cps.
The novolac resin of claim 4 when cured with hexamethylenetetramine
The two processes in general use are the one-step processproducing resole resins (which is the formation of a phenol resin) that areeither liquid or brittle, soluble, fusible solids, and the two – step process,using an excess of phenol to produce novolac, resin that have no reactive methylolgroups and must be mixed with an aldehyde to undergo further reaction.