Abstract: A glycol solvent selected from a glycol and a tetramethylammonium carboxylate having improved dehydrating capacity and a reduced aborbency for aliphatic and aromatic hydrocarbons.

Abstract: A solvent composition comprising a glycol, a potassium carboxylate and a neopentyl alcohol having improved dehydrating capacity and reduced absorbency for aliphatic and aromatic hydrocarbons.

Abstract: A closure for preventing transmission of fire and smoke through a wall or floor containing a plastic pipe when the pipe is destroyed by fire, which comprises a flexible fire retardant sleeve encircling the pipe adapted to automatically collapse about the plastic pipe as it is destroyed by fire and thus close off any opening to the next level or adjacent area.

Abstract: A fire stop device adapted to close an opening in a wall or floor having a plastic pipe extending through the opening when the pipe is destroyed by fire which comprises a base plate surrounding the opening having a collar projecting at right angles and attached to the base plate and adapted to surround the plastic pipe and means for automatically closing the collar opening when the plastic pipe is destroyed by fire.

Abstract: The present invention relates to the recovery of three aprotic amide solvents from their water solutions by extraction with a selected class of organic solvents characterized generally by having two electron withdrawing substituents, exemplified by fluorine and chlorine, located on a carbon atom which also contains a hydrogen atom.

Abstract: The present invention involves the partial carboxymethylation of cellulose to provide antithrombogenic characteristics when used as a hemo dialysis membrane. Partial carboxymethylation is obtained by reacting cellulose with an alkali chloroacetate.

Abstract: The present invention relates to the recovery of N,N-dimethylacetamide from a mixture containing N,N-dimethylacetamide and acetic acid. Potassium hydroxide is added to the mixture to neutralize the acetic acid and form potassium acetate having a low solubility in N,N-dimethylacetamide and a high affinity for water. The water concentration is adjusted to a desired range and a water non-solvent such as benzene is added to effect separation of an aqueous solution of potassium acetate from the dimethylacetamide as two distinct phases. The phases are then separated and the dimethylacetamide removed from the solvent phase by distillation.

Abstract: A thermoplastic polyester urethane molding composition is disclosed having low compression set and high elastic modulus and which comprises the reaction product of a poly(epsilon-caprolactone) polymer, a hydroxy terminated polyol, an organic diisocyanate and a siloxane polymer. More specifically, by adding the siloxane polymer and maintaining a mole ratio of isocyanate to isocyanate-reactable hydroxy grouping in the range of from about 1.05 to about 1.3 or higher, it is possible to produce an improved molding composition having allophanate cross-links. The allophanate linkage breaks down at molding temperatures and reforms upon cooling thereby allowing an easily moldable thermoplastic urethane polyester which, after molding, will maintain its shape and have characteristics of a thermoset material. Additionally, the use of the siloxane polymer improves certain physical properties of the reaction product such as tensile and modulus of elasticity.

Abstract: A light-sensitive composition comprising novel arylglyoxyalkyl acrylates that exhibits useful light sensitivity. The basic structure of the new compositions, which may also themselves be polymerized are as follows: ##EQU1## wherein Ar represents an aromatic structure selected from the group consisting of benzene, naphthalene and substituted products of each, R.sub.1 represents an alkyl group having from one to ten carbon atoms, R.sub.2 represents a grouping selected from the group consisting of hydrogen, or a lower alkyl group having from one to five carbon atoms and R.sub.3 represents an alkenyl group having from one to 10 carbon atoms and singular unsaturation. The light-sensitive compositions may themselves be utilized in photochemistry as photopolymers, they may be combined with suitable solvents and additives or polymerized with suitable backbone polymers to provide substances which can be used as light-sensitive coatings.