Vinyl resin blends

Polyvinylchloride (PVC) is commercially the most signihcant member of the family of vinyl resins. The other important members of this group are chlorinated-PVC (CPVC) and polyvinylidene chloride (PVDC). PVC is one of the most widely used, commodity type thermoplastics with an annual consumption of over 5 Mton/y in the USA. The excellent versatility of PVC is attributed to its blending capability with a variety of plasticizers, additives and fillers to yield products ranging from very flexible to very rigid types. In addition, PVC has a low cost advantage and a reasonably good balance of properties, which 

however, suffers from an inherent susceptibility to thermal degradation and hence must invariably be processed with heat stabilizers and careful control of processing temperature. The other important drawbacks of PVC are its brittleness in the absence of a plasticizer (low notched Izod impact strength) and its low heat distortion temperature (ca. 60°C) originating from its low glass transition temperature and essentially 

The toughening effect of ABS, MBS and acrylic modifiers is undoubtedly due to the controlled 

Methacrylate-butadiene-styrene Clarity, Impact strength 53 64 240 1335 

Acrylate core-shell rubbers (PMMA-g-BuA) Weatherability, 53 69 192 1041 

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Heat cured silicone Low and high viscosity chloroplatanic or organo platinum catalyst (1-5 ppm), vinyl resin blend (Polymer VS-50, 100, 90,000 Anders) Dow Coming 3-6605, and 3-6265... 

Vinyl resins ie, copolymers of vinyl chloride and vinyl acetate which contain hydroxyl groups from the partial hydrolysis of vinyl acetate and/or carboxyl groups, eg, from copolymerized maleic anhydride, may be formulated with alkyd resins to improve their appHcation properties and adhesion. The blends are primarily used in making marine top-coat paints. 

Vinyl resins Air drying Solvent evaporation Blends usually rich in ketones Very good Very good Very good Poor Good Fire hazard Flash point usually below 23°C... 

The introduction of clean air act amendments in 1990, in the USA, may require changes in the formulation of polyester corrosion-resistant resins, which contained styrene, to reduce its emissions. Substitutions, including vinyl toluene which has a much lower vapour pressure, were evaluated. It was established that resin blends containing 15% vinyl toluene had corrosion resistant values comparable to those of styrene-based resins. 

JP 05125345 (Japanese) 1993 Poly(vinyl butyral) blend adhesive composition for flexible printed circuit boards Ube Industries, Japan H Inoe, S Takabayashi, T Muramatsu, T Funakoshi Formulated resins having good flexibility and heat resistance are useful adhesives for polyimide/Cu foil laminated circuit boards Maleimide-terminated siloxane-imide block copolymers were formulated with poly(vinyl butyral) and melamine resins to give adhesive compositions. 

Epoxy resins may be blended with certain vinyl polymers to improve the impact strength and peel strength of the adhesive. Polyvinyl acetals, such as polyvinyl butyral and polyvinyl formal, and polyvinyl esters are compatible with DGEBA epoxy resins when added at concentrations of 10 to 20% by weight. The addition improves the resulting impact resistance and peel strength of the cured adhesive. However, temperature and chemical resistance are sacrificed by the addition of the low-glass-transition-temperature vinyl resins. 

Table I. Recipes and Fracture Energies of Four Elastomer-Modified Vinyl Ester Resins Blended with Various Amounts of ETBN...

The introduction of Rule 66 caused tremendous activity in the reformulation of solvent blends to conform with the regulation. An example of nitrocellulose lacquer solvents for both complying (exempt from control Rule 66) and noncomplying (nonexempt) formulations is shown in Table VII (79). Exempt solvent systems for alkyd resins have been discussed by Fink and Weigel (80). for nitrocellulose and vinyl resins by Crowley (81). for vinyl resins by Park (82) and by Burns and McKenna (83). and for epoxy resins by Somerville and Lopez (84). 

C8H1402-C7H60 poly(vinyl butyral) phenol-formaldehyde resin blend 357... 

Binary blends containing a multiblock copolymer as one component or both components in the blend, in which a certain block of the copolymer is miscible with the other polymer, were also reported to be an effective way to fabricate SMP with desired properties. This type of SMP blend include the segmented thermoplastic polyurethane (TPU)/phenoxy resin blend and TPU/poly vinyl chloride (PVC) blend [26,27]. In the blends, the soft segment of the TPU is miscible with the phenoxy resin or PVC, and Tg of this miscible... 

Zhe Zheng, S., Hu, Y., Guo, Q., Wei, J. Miscibility, morphology and fracture toughness of epoxy resin/poly(vinyl acetate) blends. Colloid Polym. Sci. 274 (1996) 410-417. 

Plastimerization is a process in which a vinyl resin is polymerized in the presence of a plasticizer. This results in a dry blend containing the plasticizer. Various plasticizers can be included in this process in concentratioirs from 50 to 100 phr. If more plasticizer is added, larger particle sizes of the polymer are obtained. ... 

Oxy Vinyls. Dry Blending of Flexible Formulas with Oxy Vinyls Resin. 

Newer types of high-performance paints used on ship exteriors include those based on epoxy resins, polyurethane resins, vinyl resins (also vinyl/ alkyd or vinyl/acrylic blends) or chlorinated rubber. Epoxies and polyurethanes are chemically-curing types and present curing problems at low temperatures, whilst the overcoating intervals are critical for best adhesion... 

As the concentration of a normally compatible resin is increased in a rubber-resin blend, a level is reached where two phases appear. Natural rubber blended with a poly (vinyl cyclohexane) resin and styrene-butadiene rubber blended with a polystyrene resin, systems which were compatible at the 50% resin level, appear to have two phases at the 75% resin level. 

Plots of tan 5 and G vs temperature were made for each series of resins with the Z-axis proportional to the concentration. The tan 8 curves for the natural rubber-poly(vinyl cyclohexane) resin blends, shown in Fig. 15, indicate incompatibility at the low rubber (25%), high... 

The blends of styrene-butadiene rubber with polystyrene resin perform similarly to the natural rubber-poly (vinyl cyclohexane) resin blends. Based on temperature scans of tan 6 as shown in Fig. 17 and G as shown in Fig. 18, a second incompatible phase is apparent at the 75% polystyrene resin concentration. 

Blending resin (extender resin) n. With respect to vinyl plastisols and organosols, a blending resin is one of larger particle size and lower cost than the dispersion resins normally used, a partial replacement for the primary resin. Blending resins are sometimes sued to achieve a better balance of properties other than cost. 

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