Resins CLEAR

Styrene. Styrene is readily polymerised to a glass-clear resin, polystyrene, but the exact nature of the polymer is influenced by the nature of the catalyst, the temperature, solvent, etc. 

Coextrusion. An increasingly popular technique to produce tailored film or sheet products is to coextmde one or more polymer types in two or more layers of melt (6). In this fashion the benefits of specific polymer types or formulations may be combined. Thus high cost barrier resins may be combined with a low cost thicker layer of standard resin to achieve an optimum barrier film at lower cost. Thin sUp-control layers may be used on the surface of a bulk layer of opticaUy clear resin to obtain an aesthetic film with good handleabUity. Lower melting outer layers may be used to provide heat sealing for polymers that seal with difficulty by themselves. 

The situation is confused, however, by the case of certain chemicals. Styrene, for example, was known from the mid-nineteenth century as a clear organic liquid of characteristic pungent odour. It was also known to convert itself under certain circumstances into a clear resinous solid that was almost odour-free, this resin then being called metastyrene. The formation of metastyrene from styrene was described as a polymerisation and metastyrene was held to be a polymer of styrene. However, these terms applied only in the sense that there was no change in empirical formula despite the very profound alteration in chemical and physical properties. There was no understanding of the cause of this change and certainly the chemists of the time had no idea of what had happened to the styrene that was remotely akin to the modem view of polymerisation. 

Chelidony 3 drachmas, fresh and clear resin 3 drachmas, gum of gold color 3 drachmas, brilliant orpiment 3 drachmas, bile of the tortoise 3 drachmas, white of egg 5 drachmas. The whole makes 20 drachmas. Add 7 drachmas of safran of Cilicia. You can write with it not only upon parchment or paper but also on a glass vessel or on marble. 

Pigmented resin banier Photobase -Kodak Royal paper -Clear resin barrier... 

Styrene has been known from the mid-nineteenth century as a clear organic liquid of characteristic pungent sweet odour. It was also known to have the ability to convert itself under certain conditions into a clear resinous solid that is almost odour-free, this resin then being referred to as metastyrol . 

Methyl methacrylate monomer, which is polymerized in large quantities in commercial practice to give the clear resinous compositions sold as Lucite and Plexiglas, is prepared from acetone cyanohydrin by a process involving dehydration and hydrolysis of the nitrile to methacrylamide, followed by aicoholysis of the amide. 

CLEAR resins differ from the standard crosslinked polymers by the incorporation of branched crosslinking agents such as 1 and 6. The amino groups present in monomers 2 and 3 constitute the attachment points for potential linker groups. CLEAR resins show excellent... 

The high mechanical stability of CLEAR resins allow their use in continous flow reactors as used in solid phase peptide synthesis. The retroacylcarrier protein sequence 74-65 was synthesised successfully in the batch mode on these resins and their properties were compared to resins like polystyrene, polyhipe, PEGA and TentaGel . 

Paraffins and hydrocarbon waxes are most commonly used in polyvinyl chloride (PVC). They are said to be better suited to those polymers that function at higher temperatures. They are not recommended for clear resins, as they tend to yellow or fog. Loadings of less than 0.5 percent are common. 

Acrylonitrile copolymers offer useful properties, such as rigidity, gas barrier, chemical and solvent resistance, and toughness. These properties are dependent upon the acrylonitrile content in the copolymers. SAN copolymers offer low cost, rigidity, processibility, chemical and solvent resistance, transparency, and heat resistance, which provide advantages over other competing transparent/clear resins, such... 

Table 5. Gas and Water Vapor Barrier Properties of Glass-Clear Resins...

Replica gratings are formed from a master grating by a liquid-resin casting process that preserves virtually perfectly the optical accuracy of the original master grating on a clear resin surface. This surface is usually made reflective by a coating of aluminum, or sometimes gold or platinum. 

Netolicky, W. Processing Clear Resins. Plastics Today, pp. 7-9, Sept. 2, 1989. 

There is another preparation route reported on PZT and PLZT ceramics (Araujo and co-workers, 1998,1999). PZT or PLZT powders were synthesized by conventional powder processing, which were then dissolved into nitric acid at 80°C. The solution was clear and pH was about 1.8. A mixture of citric acid and ethylene glycol was added to the solution, which was then heated at 110°C 1 h, resulting clear resin . The resin was applicable to deposition of films by dip-coating procedure. 

Tianjin Bohai Chemical Industrial (Group) has 6695 employees and produces PVC low viscosity clear resin with annual capacity of 600 000... 

---