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Vehicle polymers

FIGURE 9.18 Separation of 1, methyl benzyl amine 2, tartaric acid 3, diastereomer 4, drug candidate BMS-X 5, oxidation product and 6, vehicle polymers. Using a ES-PFP column (250 x 4. 6 mm with 5 p.m particles) with a mobile phase gradient starting with 95% modifier/5%C02 held for 25 minutes and ramped to 15%C02 for 5 minutes at 1.5mL/min, 311 K and 18.0 MPa modifier 43% H20/56% methanol). (Unpublished data from S. L. Phillips et al., unpublished data. With permission.)... [Pg.443]

Many of the polymer vesicles present in the literature are addressed to drug delivery applications. To achieve their potential as effective delivery vehicles, polymer-somes must efficiently encapsulate therapeutic agents. Their ability to encapsulate molecules into either the aqueous lumen [144,229,234] of the vesicle (e.g., doxorubicin) or the hydrophobic core of the membrane (e.g., taxol (TAX)) has been... [Pg.151]

One of the best methods to fulfill each of the four competitive imperatives is to use polymer materials in the vehicle. Polymers can be considered as catalysts [1] providing for... [Pg.31]

Possibility of control of the bioavailability of the therapeutic compound through variations in the particle size, the viscosity of the vehicle, polymer ad.sorpiion and desorption on the panicles, and so on. [Pg.438]

All paint systems may be considered as a combination of a small number of constituents. These are eontinuous phase or vehicle (polymer and diluent), discontinuous phase or pigment and extender, and additives. [Pg.969]

Polymer materials began appearing in vehicles as early as 1909. Their use has continued to grow dramatically because they add value to the vehicle. Polymers... [Pg.744]

Solvent and chemical resistant engineering polymers are of particular importance in applications such as storage containers, chemical plants and vehicles. Polymers with particularly good solvent resistance include PEEK, epoxy resins, polymethylpentene, PP, HDPE, LDPE, PI, PA 4,6, PA 11, PAI, polyether sulfone, PPS and PTFE. [Pg.138]

Method D appears to be possibly the most important type of isocyanate-based adhesive system. It is similar to Method B in that a preformed, fully reacted, high molecular weight polymer is employed as a vehicle in the adhesive formulation. The strength of the vehicle holds adherend members in exact position after assembly until the full bond has formed. Method D differs from Method B in that its vehicle polymer is a polyurethane. A further difference is that the inherent adhesive character and strength of the polyurethane vehicle frequently enables its use without added di- or poiyisocyanate. This strength may be realized in essentially amorphous compositions such as the thermoplastic polyurethane elastomers or millable gums. Or it may be achieved with crystallizing urethane adhesive polymers. [Pg.367]

Polymer Suspensions. Poly(ethylene oxide) resins ate commercially available as fine granular soHds. However, the polymer can be dispersed in a nonsolvent to provide better metering into various systems. Production processes involve the use of high shear mixers to disperse the soHds in a nonsolvent vehicle (72—74). [Pg.342]

Humectants and low vapor pressure cosolvents are added to inhibit drying of ink in the no22les. Surfactants or cosolvents that lower surface tension are added to promote absorption of ink vehicle by the paper and to prevent bleed. For improvements in durabiUty, additional materials such as film-forming polymers have been added. Ink developments are providing ink-jet prints with improved lightfastness, waterfastness, and durabiUty. As a result, such prints are beginning to rival the quaUty of electrophotographic prints. [Pg.54]

In the same way that natural mbber is predominandy used in blends, it is also predominandy used in tire manufacture. Its excellent building tack, low heat buildup, low rolling resistance, and good low temperature performance make it the polymer of choice for many parts of tire constmction, for both passenger and tmck vehicles. The effects of radiali2ation and demand for low rolling resistance and good low temperature performance have all tended to benefit natural mbber, especially in tmck tire constmction, as shown in Table 9. [Pg.272]

Emulsion Polymerization. Emulsion polymerization is used commercially to make vinyhdene chloride copolymers. In some apphcations, the resulting latex is used directiy, usually with additional stabilizing ingredients, as a coating vehicle to apply the polymer to various substrates. In other... [Pg.438]

Vehicles are selected by two methods. In one a concentrate is designed directiy for a resin system, the resin itself, or a compatible resin. Thus when the concentrate is made there is a minimal effect on the properties of the final color. In PVC, often a plasticizer such as dioctyl phthalate (DOP) is used. In the other method, concentrates are made with a commercial universal concentrate vehicle. Concentrate manufacturers and some resin manufacturers have developed vehicles that can incorporate many types of colorants and can be used across many classes of polymers without adversely affecting final product performance. [Pg.456]

These universal concentrates are preferred if they can be used, because inventorying costs can be reduced it is not necessary to stock different concentrates for different colorants. In some performance polymers this concept is not appHcable because the universal vehicles have a negative effect on weathering, transparency, or processing performance. [Pg.456]

Polymeric Calcium Phosphate Cements. Aqueous solutions of polymers such as poly(acryHc acid), poly(vinyl alcohol), gelatin, etc, and/or autopolymerizable monomer systems, eg, 2-hydroxyethyl methacrylate, glycerol dimethacrylate, calcium dimethacrylate, etc, have been used as Hquid vehicles (41,42,76) for the self-setting calcium phosphate cement derived from tetracalcium phosphate and dicalcium phosphate [7757-93-9J. [Pg.474]

Styrene (vinyl benzene) QH5CH=CH2 Polymers (CgHaln for audio and video cassettes, carpet backing, domestic appliances, packaging, food containers, furniture, toys, vehicle parts... [Pg.40]


See other pages where Vehicle polymers is mentioned: [Pg.217]    [Pg.1319]    [Pg.175]    [Pg.217]    [Pg.1319]    [Pg.175]    [Pg.345]    [Pg.166]    [Pg.203]    [Pg.312]    [Pg.250]    [Pg.250]    [Pg.252]    [Pg.271]    [Pg.477]    [Pg.420]    [Pg.224]    [Pg.210]    [Pg.345]    [Pg.509]    [Pg.156]    [Pg.314]    [Pg.349]    [Pg.351]    [Pg.353]    [Pg.358]    [Pg.143]    [Pg.49]    [Pg.259]    [Pg.263]    [Pg.340]    [Pg.268]    [Pg.271]    [Pg.486]   
See also in sourсe #XX -- [ Pg.32 , Pg.33 ]




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