Synthesis of Copoly(ester-amides) with alpha,omega-Di(3-aminopropyl)oligotetrahydrofur an.

Researchers obtained novel random copolyesteramides (PAE) in a two stage transesterification and condensation polymerization process conducted in the melt. The PAEs were obtained by using an oligoether with amine end groups having three different molecular weights. Oligobutylene terephthalate served as an oligoester sequence. Differential..

New, Highly Active PET Catalyst Commercially Available on Production Scale.

Acordis Research GmbH's C-94 catalyst is a highly active catalyst for the condensation polymerization of polyethylene terephthalate (PET). Manufacture of the catalyst uses hydrolytically stable titanium/silicon mixed oxides. The catalyst is up to eight times more active than antimony based catalysts. C-94 has applications in all commercia..

Continuous Dissolution Process of Cellulose in NMMO.

The continuous dissolution of cellulose in the solvent, N-methylmorpholine-N-oxide (NMMO), by either a mixing/kneading technology or a thin film technology yields lyocell fiber. List AG's mixing/kneading lines consist of the Co-Rotating Processor, which continuously conditions the raw materials, and the Discotherm B, which continuously di..

Manufacture of Carbon Fibers.

An introduction to the manufacture of carbon fibers addresses their history; polyacrylonitrile based carbon fibers (PAN), including precursor preparation, effect of comonomers, polymerization, molecular defects in acrylonitrile copolymers, extrusion, stretching parameters, clean room conditions, PAN precursor characteristics, shelf life o..

Industrial Products from Renewable Materials.

Natural materials made from agro-cellulosic renewable resources are gaining importance in nontextile and nonpaper applications due to their ecological and economic advantages over oil based polymers. Raw material sources include bast or stem fibers (flax, jute, and ramie), seed fibers (cotton and kapok), leaf fibers (sisal and palm), and ..

Proecological Utilisation of Natural Fibres (Flax and Hemp) for Clothes Production.

A study investigated flax and hemp fiber processing modifications that improve their aesthetic, comfort, and environmental properties. Modifications included such agronomic measures as variety selection; altered sowing dates, densities, and harvesting times; and various nitrogen doses. Growers allowed the straw to remain in the field unti..

Development in Flax/Hemp Processed for Improved Comfort

New flax and hemp varieties have improved fiber spinnability, enabling the manufacture of yarns for apparel using universal spinning systems. The natural fiber industry has produced linen/hemp yarns of quality sufficient for knit and woven apparel fabrics. Woven hemp apparel is growing in popularity in Europe. One hundred percent linen an..

ARTIFICIAL SILK.

Mizushima Silk Industries has produced a fibroin protein solution by using silk dissolved in calcium chloride and ethanol. The fiber combines the properties of silk and synthetics. The fibroin fiber has low adhesion, and it cannot be bonded to the carrier fiber without additional processing. To improve adhesion, 1 liter of acrylic resin s..

CELLULOSE/SILICA HYBRID FIBER -- A NEW ANSWER TO FLAMMABILITY RISKS WITH FURNISHING FABRICS

Kemira Fibers has introduced Visil, a cellulose-based silica fiber that has the feel and appearance of viscose, but is highly fire-retardant and generates no toxic fumes when combusted. The fiber can be used alone or in blends for furnishing fabrics, protective apparel, and heat insulation products. kemira developed the inherently fire-re..

ADVANCES IN ABRASION AND WET HEAT RESISTANCE OF ACRYLIC FIBERS

Acrylic fibers produce fabrics with good dyeability and a soft hand, but insufficient wet heat resistance to withstand pressing. Asahi Chemical has attempted to modify the polymer structure of acrylic fibers to improve their abrasion resistance and wet heat resistance. The resultant modified fibers are suitable for woven fabrics. The comp..