Breathable composition

At constant PBT/PTMO composition, when the molar mass of PTMO block is >2000, partial crystallization of the polyether phase leads to copolymer stiffening. The properties of polyesterether TPEs are not dramatically different when PTMO is replaced by polyethers such as poly(oxyethylene) (PEO) or poly(oxypropylene). PEO-based TPEs present higher hydrophilicity, which may be of interest for some applications such as waterproof breathable membranes but which also results in much lower hydrolysis resistance. Changing PBT into a more rigid polymer by using 2,6-naphthalene dicarboxylic acid instead of terephthalic acid results in compounds that exhibit excellent general properties but poorer low-temperature stiffening characteristics. 

Ciaccio, L. L., R. L. Rubino, and J. Flores. Composition of organic constituents in breathable airborne particulate matter near a highway. Environ. Sci. Technol. 8 935-942, 1974. 

Polyetheresteramide antistatic agents consisting of the reaction product of unde-canoic acid, hexamethylenediamine, dodecanedioic, and ethylene glycol were prepared by Linemann et al. (5) and blended with thermoplastic resins to form breathable polymer compositions. 

It is noteworthy that each of these has an outer fabric containing meta- and para-aramid blends (see Chapter 8) for good fire protection and durability. However, a number of inner layers, whether joined to the outer or part of the Uner comprising breathable polyurethane or PTFE membranes, are also a common feature. Thirdly, the use of thermally insulative nonwoven interlayers and comfortable meta-aramid/FR viscose innermost linings are also present. It is the ordering and exact interlayer compositions that appear to be the major differences, while each design attempts to provide the common properties of fire resistance, thermal insulation, moisture transport, and comfort. 

StiU other ingredients for compositions and suppliers have been described, in particular for breathable biodegradable hot melt ad-... 

S.U. Ahmed and A.W. Emiru, Breathable biodegradable hot melt composition, US Patent 7910645, assigned to H.B. Fuller Company (St. Paul, MN), March 22,2011. 

Microporous materials from PVC are used as battery seperators, filters, supports for enzymatic catalyts, breathable liners and paper substitutes. While the mechanical properties of PVC composites were studied extensively little work exists on adsorptive properties(2,3). Thus adsorption of methylene blue from aquous solutions was chosen to be studied as the representative of adsorptive properties in this work. 

The microfiber structure of the melt-blown web provides excellent barrier and breathability properties, which are required in this market segment. It is dominated by composite fabrics (mainly S/M/S), because, for example, surgical gowns need to be strong, breathable and barrier resistent. 

Particulate-filled composites are widely used in many fields of application. The filler used in largest quantity is CaCOs, which is added mainly to poly(vinyl chloride), but significant amounts are used also in polypropylene, polyethylene and other polymers. Typical products prepared from CaCOs-filled composites are sewer and drainage pipes, garden furniture and breathable films [1]. The properties of particulate-filled polymers are determined by several factors, of which interfacial interactions are extremely important [2, 3]. Particle-particle and... 

Nonwoven laminates and composites have made rapid strides in the breathable membrane sector. 

The nonwoven composite fabric provides a barrier to blood and viral challenges and also provides breathability for comfort. The fabric is particularly suited for use as a disposable surgical gown. The fabric comprises a microporous formable resin that has been extrusion-coated onto a nonwoven fabric substrate and subsequently stretched to impart microporosity, and at least one additional ply positioned adjacent to the first microporous ply. 

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