Method of producing a resin for producing heat stable products, the resin and the products

Abstract

This invention relates to a method of producing a phenolated resin which can be used to form heat stable (up to 250.degree.) products. Previously used resins are either very expensive or do not provide the requisite high temperature properties. An aim of the invention is to provide a cheap equivalent to commercially available high temperature resins. An aromatic hydrocarbon (e.g. toluene) formaldehyde condensation resin is prepared. The low molecular weight contaminants are removed by a distillation process. The residue contains less than 1% low molecular weight material, and is phenolated to give the final resin. The resin may be cured to give a heat stable product. The phenolated resin may be used to form glasscloth and asbestos laminates or as a lamp capping cement.

Dependencies are inferred from the claim text.