Abstract: A flame-retardant polymer is created by forming a first resin typically by reacting resorcinol with furfural in a ratio of one mole of the former to less than a mole of the latter in the presence of an alkaline catalyst. A resole is then formed by reacting typically phenol with formaldehyde in a ratio of one mole of phenol to more than a mole of the aldehyde in the presence of an alkaline catalyst. The first resin and resole are mixed together with a powered oxyborate compound such as zinc borate and allowed to polymerize to form the polymer.

Abstract: A novel polymer is provided as the condensation reaction product of a non-aqueous mixture of a phenol and an aldehyde in a molar ratio of about 0.5 to 1 phenol to aldehyde, containing refractory fibers, such as carbon, graphite, silica, having an aspect and metal oxides and silicates, which fibers have an aspect ratio of about 10. The phenol is selected from metacresol, orthocresol, 3,5-dimethylphenol, resorcinol and substituted resorcinols, the preferred material being mostly resorcinol. The aldehyde is selected from furfural and mixtures of furfural and paraformaldehyde. The condensation polymerization reaction can be effected by adding an acid catalyst to the mixture or by employing a curing agent which provided a polyfunctional amine reactive with either or both the aldehyde and the phenol.

Abstract: A novel polymer is provided as the condensation reaction product of a non-aqueous mixture of a phenol and an aldehyde in a molar ratio of about 0.5 to 1 phenol to aldehyde, containing refractory fibers, such as carbon, graphite, silica, having an aspect and metal oxides and silicates, which fibers have an aspect ratio of about 10. The phenol is selected from metacresol, orthocresol, 3,5-dimethylphenol, resorcinol and substituted resorcinols, the preferred material being mostly resorcinol. The aldehyde is selected from furfural and mixtures of furfural and paraformaldehyde. The condensation polymerization reaction can be effected by adding an acid catalyst to the mixture or by employing a curing agent which provided a polyfunctional amine reactive with either or both the aldehyde and the phenol.