Transparent polyester resin

The combination of odour barrier, sealability and printability provides potential for Nodax in flexible packaging. Nodax is a soft and pliable, yet reasonably transparent polyester resin. Polyester films have better printability because of their higher surface energy. For example, a thin layer of PET is often reverse-printed and then laminated over polypropylene. Nodax can substitute for both the polypropylene and polyester layers, since it can be converted like a polypropylene film and is already printable. 

CAS 112945-52-5 EINECS/ELINCS 231-545-4 Uses Filler for plastics, silicone rubber, cosmetics, pharmaceuticals, direct and indirect food applies., transparent polyester resin coatings, specialty RTV systems adsorbent, anticaking agent, glidant, suspending agent for pharmaceuticals thixotropy/suspension aid for acrylic enam-... 

The free radicals then initiate curing by attacking residual double bonds in acrylic oligomers and monomers, or in styrene and unsaturated polyester resins. Since most pigments absorb u.v. radiation and can prevent it reaching sufficient photoinitiator molecules, this technique is best suited to transparent coatings or thin pigmented layers (e.g. inks). 

Immobilization of (3-D-glucosidase from almonds on photo-crosslinkable resin prepolymer (ENTP-4000) was carried out by the following procedure. One gram of ENTP-4000 was mixed with 10 mg of a photosensitizer, benzoin ethyl ether, and 110 mg of (3-D-glucosidase from almonds (3.4 units mg ). The mixture was layered on a sheet of transparent polyester film (thickness, ca. 0.5 mm). The layer was covered with transparent thin film and then illuminated with chemical lamps (wavelength range 300 00 nm) for 3 min. The gel film thus obtained was cut into small pieces (0.5 x 5 x 5 mm) and used for bioconversion reaction. 

In polystyrene, polymethacrylate, unsaturated polyester resins, or similar media, P.R.31 affords highly transparent colorations of medium red shades, which are used as automobile tail lights and for other signalling purposes. Its heat stability in... 

P.O.38 is especially lightfast in unsaturated polyester resins. Transparent samples equal step 8 on the Blue Scale, opaque versions (0.1% pigment+ 0.5% TiOz) equal step 7 however, it should be noted that the hardening of the resin is slowed down considerably. 

P.O.36 is also used to color unsaturated polyester resins. Both transparent and opaque samples exhibit a lightfastness in these media that equals step 7 on the Blue Scale. The pigment does not affect the shrinkage of the plastic. 

ALLYL ESTER RESINS. The allyl radical (CH2CH=CH2) is the basis of the allyl family of resins. Allyl esters arc based on monobasic and dibasic acids and are available as low-viscosity monomers and thermoplastic prepolymers. They are used as crosslinking agents for unsaluraied polyester resins and in the preparation of reinforced thermoset molding compounds and high-performance transparent articles. All modem thermoset techniques may be used for processing allyl resins. 

The high strength-to-weight ratio, microwave transparency, and corrosion resistance of the laminates have led to their use in air transport applications as in aircraft radomes, ducting, spinners, and other parts. Land, sea, and air transport applications account for nearly half the polyester resin produced. 

In order to improve the heat resistance and the gas barrier properties of the PET polyester resins, the usage of blends of PET with PEN has been proposed. Blends of PET and PEN generate acetaldehyde when melt kneaded at elevated temperatures to improve the compatibility. This causes problems, such as change of taste of the contents filled in the container, and the lowering of transparency. 

Dyes can be used to obtain transparent colours in polyester resins. Considerable care in their selection needs to be taken as most will quickly fade on the addition of catalyst to the liquid resin or on exposure of the cured resin outdoors. However, certain quinone-type aromatic-soluble dyes in the yellow-red range are extremely lightfast and transparent blues and greens can be satisfactorily produced using small quantities of the corresponding phthalocyanine pigments. 

Unsaturated polyester resins are generally reinforced with glass fibers and have many applications, from transparent building construction elements to boat hulls. Their application is facilitated by the use of what are known as SMCs (sheet molding compounds). SMCs are formulated mixtures of unsaturated polyesters, vinyl monomers, initiators, and glass fibers supplied as a sandwich between two poly (ethylene) films. To apply, one film is removed, and the resin layer is pressed onto the mold with rollers, and thus... 

Other minor uses include bonding polyester laminates to polyester or to metal, and as adhesives for optical equipment. CR-39 allyl diglycol carbonate is an example of the latter. This material, in the cured condition, exhibits improved abrasion and chemical resistance over other transparent adhesive resins and displays the good heat resistance and dimensional stability associated with thermosetting systems. These properties are retained on prolonged exposure to severe environmental conditions. CR-39, which stands for Columbia Resin 39, is an allyl resin, a special type of unsaturated polyester. ... 

Multi-layer epoxy laminates demand excellent electrical insulation and the high purity of FR-1524 (TBBA) used in their production. The flame retardant of choice for transparent, UV stable, polyester resin sheet for the building industry is FR-522, a brominated aliphatic diol that guarantees low discoloration of the sheets during long sun and light exposure. 

Nepheline ne-fo- len [F nepheline, fr. Gk nephele cloud] (ca. 1814) n. A naturally occurring mineral composed mainly of feldspar and nephelite. As a filler in PVC compounds, it has the unique property of contributing almost no opacity, so that it can be used in nearly transparent compounds. It is also used as a filler in epoxy and polyester resins. 

This liquid oligomer, Clariant s EXOLIT 5087, contains 27-28% Cl and 15% P, and is useful as an additive flame retardant for transparent cast polymethyl methacrylate, unsaturated polyester resins, or rigid polsuirethane foams. It has good light stability, but is not stable to heat above about 180°C. 

The polyester resin may be modified with methyl methacrylate resins for better clarity and transparency. Recent developments involve the use of acrylates or polyvinyl flnoride as surface coatings bonded to the laminate for longer gloss retention. The prodnct is cnred at ambient temperatures, although heat will accelerate the cure and ensure a more satisfactory laminate. The same procedures are also followed in producing epoxy-resin laminates, although these are not as widely used in the construction industry. 

Soon after their introduction in the 1940s, UP resins were used for encapsulating natural history objects (Purves and Martin, 1950). This use has probably been abandoned for objects that must be preserved. One example has been published of a transparent resin that went opaque (Meurgues, 1982). Polyester resins deteriorate when exposed to weathering (Beloto, 1994), though it is possible to specify grade and application methods to reduce the tendency. 

A good basecoat is important in a COB system. Coloured metallic basecoats use strong, transparent, light fast pigments dispersed in an oil free polyester resin. As the film thickness is thin, relatively high levels of pigment are required to give deep metallic shades. 

Features Inc. transparency and hiding power permits higher pigment loading compat. with many grinding polyester resins may improve adhesion to aluminum substrates... 

Features Improves sir. as glass fiber size composite in reinforced polyester composites enhances initial wet sir. of reinforced polyester resin composites enhances wet elec, props, of many min.-filled and reinforced composites Properties Colorless transparent liq, faint sweet odor sol. in methanol, ethanol, isopropanol, acetone, benzene, toluene, and xylene m.w. 248.4 dens. 1.045 vise. 2cSL b.p. 255 C flash pi. 108 C ref. index 1 4202 0.0005 PD-23 [Sonnebom]... 

Color/Transparency. Almost all amorphous engineering thermoplastics, except PC and some polyester carbonates, are inherently colored. Even polycarbonates have yellowness indexes (YI) (36) of 0.1 to 5.0. Colorless material is produced from these resins by compounding with complementary blue dyes which reduce transmission. Ha2e in amorphous resins is an indication of particulates. Ha2e reduces optical clarity and transmission. 

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