Opening Remarks

Industry Intrigued by CO(2) as Solvent.

Du Pont announced plans to construct a $40 million development facility to evaluate the use of supercritical carbon dioxide (CO(2)) as a reaction solvent for the manufacture of its Teflon fluoropolymers. Heated to temperatures above 31 degrees centigrade and pressures above 73.8 bar, supercritical CO(2) possesses both gas-like and liquid-..

How To Stretch TiO(2)

Incrases in the price and delivery time of titanium dioxide (TiO(2)) have rekindled interest in white mineral fillers that serve as partial TiO(2) replacements. The two most important properties for TiO(2) replacements are opacity and whiteness. Fine ground calcium carbonate and calcined kaolin clays are the most popular TiO(2) extenders ..

Techtextil Report: Growth through Innovation.

At the Techtextil Symposium held in Frankfurt, Germany, in April 1999, industry analysts discussed the need for raw material suppliers to capitalize on the availability of advanced technologies that facilitate the manufacture of high performance products for more sophisticated end uses in sectors with higher profit margins. Although high ..

CHLORINATION OF CELLULOSE WITH SULFURYL CHLORIDE IN LITHIUM CHLORIDE-DIMETHYLACETAMIDE AND AZIDATION OF THEIR PRODUCTS.

Cellulose powder was chlorinated with sulfuryl chloride in a mixture of lithium chloride and N,N-dimethylacetamide in the presence of pyridine. Derivatives containing chlorine and chlorosulfate groups were prepared. Sodium iodide treatment of these derivatives yielded chlorodeoxycellulose with a maximum degree of substitution of 1.8 by ch..

THERMAL SENSIBILITY OF POLYPROPYLENE FIBERS

The effect of heat on polypropylene fibers was studied to determine the highest temperature to which the fiber can be subjected before decomposition occurs. The studies concluded that hydrothermal treatment is the most damaging to polypropylene, causing dimensional changes which limit the fiber's applications. 7 refs.

RECENT AND FUTURE DEVELOPMENTS OF SYNTHETIC FIBERS

Worldwide trends in the production and development of manmade fibers are described. Production of cellulosic, nylon, acrylic, and other manmade fibers is considered. After a short history of manmade fiber production is presented, products by leading fiber manufacturers for the apparel, home furnishings, and biomedical markets are describe..

A New Preparation Method for Porous Titanium Trichloride

Researchers established a method for preparing a high performance porous titanium trichloride catalyst for propylene polymerization. Reduction of titanium tetrachloride with a concentrated alkylaluminum compound yielded alpha-titanium trichloride. A highly active porous titanium trichloride catalyst was obtained from the mixture of dibuty..

Continuous Anionic Polymerization

Conventional anionic polymerization processes for styrene use alkali metal alkyl initiators in the presence of an alkyl or aryl metal polymerization regulator to moderate the rate of anionic chain growth to control the molecular weight and polymerization temperature and optimize efficiency. A novel process increases efficiency by using an..

Anionic Polymerization and Centrifugal Devolatilization

Centrifugal force devolatilizers remove volatiles from vinyl aromatic polymers. Using centrifugal force devolatilization in an anionic polymerization process produces polymers monomer, solvent, and initiator phlegmatizer. Vinyl aromatic monomers suitable for this process include styrene, alpha-methylstyrene, all isomers of vinyl toluene (..