Abstract: This invention relates to a polymer concrete composition; to methods for lining pipes and for filling girthweld concrete cutbacks using the composition, and to a reusable mold for preparing filled girthweld concrete cutbacks. The polymer concrete composition contains no transition metal compounds and comprises a vinyl ester resin or an unsaturated polyester resin, a free radical initiator; a transition metal free, an accelerator which does not contain a transition metal.The reusable mold comprises a separable sheath (10) having a means (21) for introducing a filler composition to the girthweld concrete cutback (40). The sheath is capable of conforming generally to the shape of the coated pipe (1, 2) or other coated conduit and circumscribing the entire circumference or perimeter of at least a portion of the pipe or other conduit. The mold further comprises a closure means (20) mounted on the separable sheath.

Abstract: In a process for producing polyurethane foam, which process comprises reacting in one step a polyether polyol and a crosslinking agent with a polyisocyanate in the presence of a catalyst and a blowing agent, the improvement of employing as at least a major proportion of the crosslinking agent a soluble amine salt obtained by reacting a cycloaliphatic polyamine having at least two primary amine groups with approximately the stoichiometric amount of a carboxylic acid.