Dynamit Nobel Aktiengesellschaft

Isobloc Gmbh

Franz Weissenfels

Hans Junger

Klaus Bruning

Wolfgang Pungs

Michael Wienand

Peter Rheinfeld

Walter Hoppe

Josef Tiroux

Aloys Aust

Walter Engels

The present invention relates to hard foams having foamed and hardened phenolic resins as binding agents, and in which over 90% of the filler is aluminum hudroxide. The filler content is more than 100% with respect to the resin content of the foams. The foamble, filler-containing composition used for the production of the foams is very fluid and can be used directly for the production of moldings of any desired geometry. The aluminum hydroxide used has a grain size distribution such that between 30 to 60% of the filler is in the grain size range under 5 microns. The moldings containing the hard foam can also be in the form of composites. They are characterized not only by their good insulating properties but also by improved compressive strength, extremely little shirinkage tendency and extraordinarily high fire resistance. They are used mainly in the construction industry.

Phenolic resin foams of high filler content and their use as insulation

Improvement in the preparation of open-pored phenolic resin foams by the foaming of intimate mixtures of water-containing phenolic resol resins in the viscosity range of from 1000 to 20,000 cP, low-boiling organic liquids in which the phenolic resol resins are not soluble as blowing agents and acid-containing hardeners, the improvement comprising adding to the foamable phenolic resol resin before or during the preparation of the foamable mixture, 1.0 to 6.0 weight-percent of ethoxylated castor oil and 0.5 to 5 weight-percent of an alkyl sulfate salt of the general formula

Method for the preparation of highly absorbent phenolic resin foams

A composition comprising a granular inorganic oxidic material other than glass powder and 1 to 30 weight percent, based on the weight of said material, of glass powder, especially a composition additionally containing a hardenable thermo- or cold-setting phenolic resin, which composition does not disintegrate at high temperatures and retains compressive strength.

Hardenable compositions of improved thermal stability

Foamed phenolic resins containing CaSO.sub.4. nH.sub.2 O, where n is 0-2, having reduced tendency to shrink and reduced weight loss on aging.

Phenolic resin foam having reduced tendency to shrink

A metallurgical vessel having a tap hole containing a plug comprised of a hardened composition comprising a granular inorganic oxidic material other than glass powder and 1 to 30 weight percent, based on the weight of said material, of glass powder, especially a composition additionally containing a hardenable thermo- or cold-setting phenolic resin, which composition does not disintegrate at high temperatures and retains compressive strength.

Metallurgical vessel

Process for hardening liquid resols comprising using for the hardening, strong acids which if they are solid at room temperature are used in the form of their mixtures with inert finely divided solid diluents or if they are liquid or gaseous at room temperature adsorbed onto an adsorbing agent.

Method of hardening liquid resols

Method of hardening and foaming liquid resols using a mixture of diluent

A process for improving the strength and elasticity of molded articles containing inorganic oxide-type fillers and cured novolaks which includes the step of intermixing a dialkalene glycol dibenzoate with the novolak prior to curing the novolak and thereafter forming the molded articles in a conventional manner including curing with conventional agents.

Process for improving the mechanical properties of novolak-cured molded

An apparatus for the continuous manufacture of phenolic resin foam in an endless sheet which includes mixing means for expandable liquid phenolic resin with a blowing agent and an acid-containing curing agent, optionally with the addition of additives, and means for processing the mixture in a temperature-controllable double belt press. The apparatus also comprises a device for cooling the phenolic resin to a temperature of from about 8.degree. to about 15.degree. C., a mixing section for admixing a blowing agent under a high pressure with said resin to form a resin premix, for mixing said resin premix with a curing agent resin to form a resin premix, and mixing said resin premix with a curing agent and other foam additives to form a curable reaction mixture, an applicator device for continuously applying said mixture uniformily onto a moving substrate, a unit for covering the mixture on said substrate with a continuous protective layer, a conveyor belt for passing the covered mixture into the double belt press, means for heating the belt press to promote foaming of the mixture under pressure until a desired sheet thickness has been obtained and a device for measuring the foam pressure within said belt press so that the foaming pressure and also the sheet thickness can be regulated.

Apparatus for the continuous manufacture of phenolic resin foam in

An apparatus for the continuous manufacture of phenolic resin foam in an endless sheet which includes means for mixing expandable liquid phenolic resin with a blowing agent and an acid-containing curing agent, optionally with the addition of additives, and means for processing the mixture in a temperature-controllable double belt press. The apparatus also comprises a device for cooling the phenolic resin to a temperature of from about 8 to about 15.degree. C., a mixing section for admixing a blowing agent under a high pressure with said resin to form a resin premix, for mixing said resin premix with a curing agent resin to form a resin premix, and mixing said resin premix with a curing agent and other foam additives to form a curable reaction mixture, an applicator device for continuously applying said mixture uniformily onto a moving substrate, a unit for covering the mixture on said substrate with a continuous protective layer, a conveyor belt for passing the covered mixture into the double belt press, means for heating the belt press to promote foaming of the mixture under pressure until a desired sheet thickness has been obtained and a device for measuring the foam pressure within said belt press so that the foaming pressure and also the sheet thickness can be regulated.

Growing community of inventors

Siegburg, Germany

Franz Weissenfels