Dispersion resins properties

Suspension Polymerization. Suspension polymerization is carried out in small droplets of monomer suspended in water. The monomer is first finely dispersed in water by vigorous agitation. Suspension stabiUzers act to minimize coalescence of droplets by forming a coating at the monomer—water interface. The hydrophobic—hydrophilic properties of the suspension stabiLizers ate key to resin properties and grain agglomeration (89). 

J. A. Jaffe, L. E. Robb and W. B. Happoldt jr. Teflon" tetrafluoroethylene resin dispersion-extrusion properties of lubricated resin from coagulated dispersion. Ind. and Eng. Chem. 44, 1805 — 1810 (1952). 

In PVC coating formulation fillers play a role. Filler choice mostly depends on the way the filler affect viscosity. The filler should not absorb the plasticizers nor interfere with the pseudoplastic behavior of the paste which is determined by the resin properties and by the choice of plasticizers. Fillers must be completely dispersed, since the gaps between the coated substrate and the knife are very small. There must be no lumps. Fillers should not interfere with deaeration which is... 

Ancillary Testing of Inhibitor Resin Properties. It was found that inhibitor could be introduced fairly readily in the two part liquid system either by direct dissolution in the resin or hardener or, for some of the less soluble inhibitors, as a fine dispersion in the resin. Introduction in powder transfer moulding resins was achieved by ball milling the inhibitor with the powder. Subsequent analysis of samples of powder showed that the inhibitor had been uniformly dispersed. 

The primary reason for utilizing a dispersion resin system is to obtain the benefit of fluid properties. With viscosity characteristics in mind, we must consider this qualification for the plasticizers used in plastlsols. 

Chem. Descrip. 2-Ethylhexyl acrylate CAS 103-11-7 EINECS/ELINCS 203-080-7 Uses Copolymer intermediate for resins and dispersions forfabrics, inks, glues, and adhesives cleaning and waxing prods. org. synthesis aq. disp. for nonwoven fabrics, textiles, and paper additives for fuel oils and lubricants syn. rubber and latexes plastics and syn. resins Properties APFIA10 max. clear liq. m.w. 184 sp.gr. 0.880 vise. 1.52 mPa s vapor pressure < 1 mbar (20 C) f.p. - 90 C b.p. 213.5 C ( 1013 mbar) flash pt. (OC) 92 C ref. index 1.433 Precautiorr Flamm. 

Uses Dispersant for high quality industrial coatings like automotive enamels, pigment pastes, and for polyesters, stoving all s. air drying alkyds. crosslinking acrylics, polyurethanes, and phenolic resins Properties Liq. 

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. 

Hydantoin-Based Epoxy Resins. These resins were commercialized by Ciba-Geigy. Hydantoins are prepared from carbon dioxide, ammonia, hydrogen cyanide, and ketones via the Bucherer reaction and can be epoxidized with epichlorohydrin (67). Cured and imcured resin properties depend greatly on the nature of the substituents R and R. The hydantoin derived from acetone furnishes a low viscosity, water-dispersable epoxy resin, 5,5-dimethyl-l,3-bis(2,3-epoxypropyl)-2,4-imidazolidinedione (R = R = CH3 145 EEM rj at 25°C 2.5 Pa s). A nonsintering solid epoxy resin is obtained if R = R = —(CH2)5—. 

Today the PVC field exhibits considerable complexity. Commercial resins may be classified into general purpose resins, dispersion resins, blending resins, solution resins, and lattices. Within these general categories there are a number of subclasses based on physical properties. 

The effect of resin molecular weight on the physical properties of plastisol compositions is the same as for flexible PVC. The incorporation of blending resin or copolymer resin into a plastisol formulation will generally decrease physical properties versus plastisol formulations based entirely on dispersion resin of the same molecular weight. 

Air Reiease The air release properties of a dispersion PVC resin are governed by both the formulation and the surface coating on the plastisol resin. Air release is facilitated by low plastisol viscosity at low shear rates and a reduced surface tension. Coatings on the dispersion resin particle siuface can have a significant effect on viscosity and surface tension, as can other additives. Resin particle size can also play a role in air release, with larger particle sizes yielding improved air release. 

Lower-molecular-weight dispersion resins with T-values ranging from 57 to 62 are preferred for several reasons. The main reason is that lower-molecular-weight resins have better flow properties at any given temperature than higher-molecular-weight resins. The improved flow properties help simplify molding, and the lower... 

A Dispersion Resins for dear Applications One of tbe problems with the surfactant coatings normally found on dispersion resins is that they ereate issues with clarity. There are dispersion resins available that use low levels of eare-fuUy chosen surfactants to yield clearer products than those made from typieal dispersion resins. Although careful surfactant choice can help minimize the issues associated with reduced surfactant levels on dispersion resins, plastisols based on these resins are mote likely to require other formulation additives to achieve desired rheological properties than typical plastisol resins. 

Formulations for the very sophisticated multilayer products are closely guarded proprietary information, but it is known that it is necessary to use special dispersion resins to achieve the highest clarity in the wear layer in fact, it is common to use two or more resins to achieve an optimum balance of rheological properties and clarity. Many of the vinyl formulations currently used in sheet flooring have been optimized around the use of more cost-effective plasticizers such as DIHP and BBP, which in addition have desirable solvating characteristics. Other plasticizers used in sheet flooring include viscosity-depressant types such as Jayflex 215 and TXIB. 

Uses Emulsifier for rosin, vinyl acetate and acrylate systems, anticorrosive applies. dispersant for colophonium resins Properties Liq. 100% solids Disponil AEP 9525 [Cognis]... 

Uses Processing aid, dispersant for polyolefins and rubbers including hot-melt and pressure-sensitive adhesives, tapes and labels, nonwovens Features Low m.w. exc. thermal and UV stability low color and odor broad corn-pat. with numerous elastomers, polymers, and other tackifying resins Properties Gardner 1 molten solid Brookfield vise. 6000 cP Storage Handled entirely in closed systems blanketed with an inert gas, such as nitrogen and stored in a steel tank at 350-390 F Eastoflex PI 023 [Eastman]... 

Uses Curing agent for epoxy resins formulating emulsifiers, pressure-sensitive adhesives, corrosion inhibitors reactive dispersant, surfactant to modify resins Properties Colorless to pale yel. si. hazy, vise, liq. water-sol. m.w. 2000 sp.gr. 

Uses Slip agent in polyethylene, polypropylene films dyestuff dispersant for printing inks, surface coatings blending agent for polyamide resins Properties Gardner color 2 max. particle size 100% < 40 mesh sieve m.p. 76-86 C iodine value 70-82 acid value 1.0 max Kemamide EBS [PMC Spec.)... 

Uses Detergent wetting agent emulsifier, dyeing assistant dispersant for dyeing, finishing, textiles, pigments, resins Properties Cl. liq. mild odor water sol. 100% act. 

Uses Wetting and dispersing agent for aq. systems rec. for air-dry and stoving water-thinnable systems based on emulsions, alkyd, and acrylic resins Properties Brn. cl. vise, liq. sp.gr. 1.01 flash pt. 10 C pH 8.6 60% act. in ethanol Forbest 620 [Cargill Texturizing Solutions]... 

Uses Detergent, wetting agent, dispersant emulsifer for waxes, oils, and fats stabilizer for syn. resins Properties Solid HLB 14.5 100% cone,... 

Resin Viscosity. The flow properties of uncured compounded plastics is affected by the particle loading, shape, and degree of dispersion. Flow decreases with increased sphericity and degree of dispersion, but increases with increased loading. Fillers with active surfaces can provide thixotropy to filled materials by forming internal network stmctures which hold the polymers at low stress. 

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