Polyolefins fibres

Peroxidic groups in oxidized polyolefins have frequently been employed as sources of free radicals to allow grafting of vinyl monomers to polyolefins (2f[). Some of the products from the gas reactions also have interesting potential as reactive sites. For example, chloroformate groups are well known to react with alcohols, and amines 2J[). Thus chloroformate groups could be useful for example in coupling highly oriented polyolefin fibres to resins such as epoxy based systems. 

J. G. Cook, Handbook of Polyolefin Fibres , Merrow Publishing, Watford, 1967. 

Analysis of damage to polyolefin fibres, especially polypropylene... 

Of the two polyolefin fibres polypropylene (PP) and polyethylene (PE), polypropylene has by far the greater importance. PP is the second most important synthetic fibre type after polyester and continues to grow at a remarkable rate. 

Recently elastic polyolefin fibres have also been introduced (generic name lastol), they are cross-linked and stable at temperatures up to 220 °C and above.- High-tenacity polyethylene fibres, with ultra high molecular weight (UHMW-PE, Dyneema) have been available for some time they are produced by a gel-spinning process at high dilution. 

Damage by light and oxidation to polyolefin fibres, including photo-oxidation... 

Patent Number US 5853883 A 19981229 POLYOLEFIN FIBRES CONTAINING ANTIMICROBIAL SILOXANE QUATERNARY AMMONIUM SALTS... 

In 1970, an acid-dyeable polypropylene fiber was described [158]. It was claimed that this fiber could be dyed like nylon and could produce one-batch union shades in blends with cotton and acrylics. The dye site in this fiber was present as a microfilament dispersed within the polypropylene. These microfibers extended to the surface of the fiber and water was readily absorbed in order that acid dyes could penetrate at a reasonable rate to react with the basic dye sites. Acid-dyeable polypropylene fiber products have been available from Phillips [159] and, from Polyolefin Fibres Engineering (PFE) Ltd. [160]. PFE has also introduced a bicomponent fiber readily dyeable with disperse dyestuffs [161]. 

Prepared filaments and fibres are applied not only in the floor coverings as the most important utilization for PP, but also medical, hygienic, apparel, automotive and/or agricultural sectors became crucial, for applications such as disposable diapers, sports underwear and equipment, artificial grass, geo textiles, ropes, car seats, oil wipes, wet and dry filters or membranes. Physical and chemical properties of polyolefins fibres are developed for many applications, in order to increase comfort characteristics, tensile strength, and/or other utility properties they are often blended, co-processed or combined with other materials such as polar acrylics, wool, bonding agents, hydrophilic fillers, or stabilizers. 

Polyolefin fibres Industrial and medical applications Edited by S. C. O. Ugbolue... 

All 140 members of the International Convention for the Safety of Life at Sea (SOLAS) reqnire a thermal protection aid (TPA) to be carried on board vessels as standard eqnipment in case of shipwreck and the thermal protection required is from cold, to prevent hypothermia. The spnnbonded polyolefin fibre fabric Tyvek , made by DnPont, when alnminised and made into survival suits and survival bags, satisfies the SOLAS criteria. These suits can also be used in Arctic emergencies. Thermal insnlation overalls made from Tyvek are also carried by many Merchant Navy ships and by several airlines flying the polar route in case the aircraft is forced down onto the Arctic ice. ... 

A UV stable iV-alkoxy hindered amine additive containing no halogen offers flame retardancy at surprisingly low concentrations. It synergises with conventional bromine- and phosphorus-containing FRs to provide improved performance in polyolefin fibre and moulding applications. 

Styrene butadiene copolymers (SBCs) Available as both a pressure-sensitive and nonpressure-sensitive adhesive, good flexibdity and toughness, resistant to both hot and cold temperatures. Used to join difficult-to-bond substrates (e.g., polyolefin fibre). Medium... 

Kaul, B., Ripke, C. and Sandri, M. (1996) Technical aspects of the mass-dyeing of polyolefin fibres with organic pigments. Chemical Fibers Ini. (CFI), 46(April), 126-129. 

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