Theyield of the resin is about 110% of the weight of the phenol.

By using this method to analyze the results of competitionreactions, relative monomer and site reactivities for phenol and thecresols with formaldehyde have been determined.

This phenol resin is called novolac resin.

Properties of the various samples of Phenol-Formaldehyde 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.

This resultshows that the modified P-H resin has a higher viscosity than the novolacresin.

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.

The novolac-cyanate and propargyl-novolac resins provided anaerobic char yields at 800 C of 58 percent.

Preparation of epoxy-novolac resin binder using …

We successfully prepared a new class of a reactive novolac (3) having a methylol moiety as a functional group derived from its precursor synthesized by the acid-catalyzed addition–condensation of a bisphenol A derivative and formaldehyde. Curing reaction between 3 and the low-molecular-weight phenolic resin (4) afforded the curing product, which showed enhanced thermal stability compared with 4 or the conventional phenolic resin. Consequently, 3 can be applied as a curing agent to modify the thermal property of 4.

11. Coated particle having a coating comprising a binder composition of a solid Novolac resin according to claim 1 and a crosslinking agent.

Resol type phenolic resin/layered silicate nanocomposites (RPLSNs) ..

Two batches of coated sand were then tested using standard tests, as shown in the following Table. The results show that the sand with Novolac resin with a lower content of phenol, retained its ability to cover the sand and to produce the product covered by sand, with equal or superior properties ultimate tensile stress during cooling and heating.

Thirty-four andseventy-tenth parts of 15% hydrochloric acid, corresponding to 0.4% of 100% HClon the weight of phenol were slowly added.

manufactured of phenolic resin novolac

3. The binder composition of the solid Novolac resin according to claim 1, containing less than 0.5% of free phenol and exhibiting a melt viscosity at 150°C. of less than 3000 cps.