Polymers flash spinning

By special processes, like polymerization under shear conditions or flash-spinning of polymer solutions, it is furthermore possible to obtain materials which do not only have this new shish-kebab micro-morphology, but also a new macro-morphology, namely the polymer fibrids.35... 

Microcellular foams can be obtained by flash spinning and are usually prepared at relatively high polymer concentrations in the spinning solution, i.e., at least 40% synthetic fiber-forming polyolefin. 

Fibrids Short, irregular fibrous products, made by mixing a dilute polymer solution with a non-solvent with agitation. They can also be made by flash spinning and breaking up the resulting filaments. Used in felts, in papermaking, for filtration product, etc. Also see fibrets. 

Spun bonded media production processes exploit the thermosetting properties of polymers, to form fibres that can be bonded by combinations of heat, pressure and chemical activation. Melt spinning, using conventional synthetic fibre technology, was the earliest method used for producing spun bonded filter media and continues to be of major importance, but finer fibres are produced by melt blowing and flash spinning processes. 

Flash spinning High production rate Economic process Short fibre lengths (3—10 pm) Solvent recovery Proprietary technology Limited range of polymers High fibre diameter distribution... 

The previous section presented a model study of the coagulation of a polymer solution brought upon by diffusion of a nonsolvent. The present section focuses on the faster process of phase separation inside a binary polymer-solvent system induced by an abrupt change in external temperature and/or pressure. This problem is of obvious importance in polymer processing techniques based on thermally induced phase separation (31) or on rapid expansion of supercritical solutions (32). A typical example of the latter is the flash spinning process. Here, a... 

Uses Solubilizer for perfumes in personal care prods., vitamin oils antiirritant in baby shampoos rinse aid in rayon finishing antistat and lubricant in textiles coemulsifier in dye carrier textile formulations emulsifier for pefrol. oils, fats, soivs., and waxes in household prods. spinning aid for nylon vise, modifier food pkg. adhesives, coating, paper, polymers, fexfiles food-contact defoamer and emulsifier Regulatory FDA 21CFR 172.515,175.105,175.300,176.180,176.210, 177.1210,177.2260,177.2800,178.3400 DOT nonregulated Properties Pale yel. oily liq. sol. in water, aromatic soivs. insol. in aliphatic, chlorinated, soivs. and oils sp.gr. 1.10 g/ml b.p. > 212 F HLB 16.7 sapon no. 40.0-50.0 hyd. no. %.0-108.0 flash no. (COC) > 300 F nonionic 97% cone. 

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