Flexibility, improvement

Related to competitiveness measures - improved quality, compressed lead time, reduced life-cycle costs, increased flexibility, improved productivity, more satisfied customers... 

New Neoprene M- and XD grades. These polychloroprenes were developed in the 1990s and combine low temperature flexibility, improved heat resistance and dynamic properties. 

Certain sectors of industry are seeking to use lightweight and corrosion-resistant compact heat exchangers for condensation as well as for convection duties. This requirement is of particular interest in the aviation, automobile and domestic heating and ventilation industries. Also, recent interest in the concept of mobile chemical plants necessitates the use of lightweight compact heat exchangers. Such plants may well have an important role to play in the future of processing as they provide flexibility, improved inherent safety... 

Flexible PVC characteristics depend broadly on the formulations flexibility improved low-temperature behaviour fire-retardant grades low cost possible food contact and transparency easy to weld and stick. 

Thanks to their multiphase constitution, block copolymers have the originality to add advantageously the properties of their constitutive sequences. These very attractive materials can display novel properties for new technological applications. In this respect, thermoplastic elastomers are demonstrated examples (l, 2, 3) they are currently used without any modification as elastic bands, stair treads, solings in the footwear industry, impact resistance or flexibility improvers for polystyrene, polypropylene and polyethylene whereas significant developments as adhesives and adherends are to be noted (5.). 

Medium and high molar mass polyisobutenes are used essentially as basic materials for sealants and adhesives, as flexibility improvers for waxes and bitumen and as impact additives for thermoplastics. The low toxicity allows their use in chewing gum formulations. Detailed production is not disclosed but it is probably limited to a few tenths of kilotons. Main producers are BASF (Oppanol Bl-3, B10-50, B80-246) and Exxon Chemical (Parapol, Vistanex LM and MM). 

Use Plasticizer for low-temperature flexibility improvement of vinyl resins. 

Flexibility The inherent resilience of rubber polymers often provides protection in expansion/contraction modes due to product temperature cycling and flex stress from repetitive work cycles. Plus this flexibility improves the assembly s resistance to vibration, fatigue, impact, shear, elongation, and peel forces. 

General Description Ethylene Vinyl Acetate (EVA) Copolymer is a copolymer resin ranging in vinyl acetate content from 7.5 wt% to 33 wt%. DuPont Elvax and Equistar Ultrathene grades vary by vinyl acetate content. Some grades are available with antiblock and slip additives. The vinyl acetate units in the copolymer modify the basic polyethylene structure and its properties. The addition of vinyl acetate to polyethylene provides lower sealing temperature, increased flexibility, improved optical properties, greater adhesion, increased impact, and puncture resistance. 

Features Balanced durability and flexibility, improved weatherability, exc. 

An increasing amount of incorporated polar comonomers such as vinylacetate leads to reduced crystallinity combined with improved low-temperature properties, improved toughness and flexibility, improved impact strength, and reduced flexural modulus (stiffness). Typical applications for EVA grades include footwear, films, hot melt adhesives, and wire and cable. The improved low temperature properties are utilized in, for example, deep-freeze bags. 

High Melt Index 500 Improves heat seal strength - Improves flexibility Improves low temperature performance Improves hot tack Increases melt viscosity - Low Melt Index 2.0... 

Future designs will include appropriate improvements in design margins for commercial and other reasons, e.g, investment protection, operational flexibility, improvements in aging management and long-life attainment, etc. These improvements are of benefit to safety. 

Fact While this may have been tme in the past, FR clothing is now manufactured to be softer and more flexible. Improvements of new fiber blends of cottons and inherently FR fibers allow the clothing to be more comfortable today, f-r/t l... 

While HNBR and NBR can be compounded with many of the same plasticizers and softeners, care must be taken with HNBR to assure that the plasticizer used is not so volatile that it detracts from the overall heat resistance of the finished compound. Common plasticizers used at a 20 phr level are summarized in Table 3.10 [15]. While plasticizers such as Dioctyl phthalate and dibutoxy ethoxy ethyl adipate are effective in reducing hardness and viscosity, they are also volatile at high temperatures and can give finished part shrinkage in prolonged heat aging. For an overall balance of low-temperature flexibility improvement, viscosity reduction, and stabUity to heat aging, the trioctyl trimellitate and the triisononyl trimellitate plasticizers are excellent choices. 

---