Abstract: A concrete mixing includes a barrel having an interior surface and an exterior surface. A blade extends from the interior surface for mixing concrete and a ring is positioned about the exterior surface of the barrel for rotation of the barrel. An expandable joint is provided under compression between the ring and the exterior surface of the barrel to accommodate different thermal coefficients of expansion between the barrel and the ring.

Abstract: A concrete mixing includes a barrel having an interior surface and an exterior surface. A blade extends from the interior surface for mixing concrete and a ring is positioned about the exterior surface of the barrel for rotation of the barrel. An expandable joint is provided under compression between the ring and the exterior surface of the barrel to accommodate different thermal coefficients of expansion between the barrel and the ring.

Abstract: A method for the manufacture of polyester polyols is disclosed. The method comprises feeding to a reactor at least one aliphatic carboxylic acid or ester thereof, at least one secondary dihydric alcohol and at least one primary trihydric alcohol, heating the resultant admixture and removing water. When at least 95% of the water has been removed, additional primary trihydric alcohol is added and heating is continued. The reactants are selected so that the range of molecular weights thereof is not more than 100. A block polyester polyol is obtained. Polyurethanes obtained from the polyester polyol tend to have more uniform and superior properties. The polyurethanes may be used in variety of end uses.

Abstract: A method for the manufacture of polyester polyols is disclosed. The method comprises feeding to a reactor at least one aliphatic carboxylic acid or ester thereof, at least one secondary dihydric alcohol and at least one primary trihydric alcohol, heating the resultant admixture and removing water. When at least 95% of the water has been removed, N-phenyl dialkanolamine and additional primary trihydric alcohol are added and heating is continued. The reactants are selected so that the range of molecular weights thereof is not more than 100. A block polyester polyol is obtained. Polyurethanes obtained from the polyester polyol tend to have more uniform and superior properties. The polyurethanes may be used in variety of end uses.

Abstract: A micro cellular polyetherurethane foam of the aliphatic diisocyanate type suitable for use in shock absorbers.

Abstract: The preparation of the polyols involves the following steps: (a) introducing in a reactor a mixture of acids comprising about 50 to 70% by weight of glutaric acid, about 15 to 30% by weight of succinic acid and about 10 to 20% by weight of adipic acid, or esters or anhydrides of these acids, with at least one polyhydroxy alcohol selected from the group consisting of secondary alcohols, tertiary alcohols and highly cluttered primary alcohols, with a catalyst selected from the group consisting of stannous and stannic chlorides and alkyl-tin compounds; (b) the reaction mixture is flushed with an inert gas; (c) the reaction mixture is heated while stirring at a temperature which does not exceed about 225.degree. C.; (d) removing 90 to 95% of the water or methanol formed in step (c); (e) introducing into the reactor at least one slightly cluttered primary alcohol; (f) heating at about 225.degree. C.

Abstract: Preparation of new polyols from mixtures of dicarboxylic acids comprising glutaric acid, succinic acid and adipic acid and polyhydric alcohols, such as mixtures of acids which are derived from treated residues resulting from the industrial production of adipic acid. Preparation of new polyurethanes from these polyols by reacting the latter with polyisocyanates. Obtaining products possessing advantageous properties and interesting market for treated residues resulting from the industrial production of adipic acid.