Vinyl acetate resins

Figure 3 shows the production of acetaldehyde in the years 1969 through 1987 as well as an estimate of 1989—1995 production. The year 1969 was a peak year for acetaldehyde with a reported production of 748,000 t. Acetaldehyde production is linked with the demand for acetic acid, acetic anhydride, cellulose acetate, vinyl acetate resins, acetate esters, pentaerythritol, synthetic pyridine derivatives, terephthaHc acid, and peracetic acid. In 1976 acetic acid production represented 60% of the acetaldehyde demand. That demand has diminished as a result of the rising cost of ethylene as feedstock and methanol carbonylation as the preferred route to acetic acid (qv). 

The thermal glass-transition temperatures of poly(vinyl acetal)s can be determined by dynamic mechanical analysis, differential scanning calorimetry, and nmr techniques (31). The thermal glass-transition temperature of poly(vinyl acetal) resins prepared from aliphatic aldehydes can be estimated from empirical relationships such as equation 1 where OH and OAc are the weight percent of vinyl alcohol and vinyl acetate units and C is the number of carbons in the chain derived from the aldehyde. The symbols with subscripts are the corresponding values for a standard (s) resin with known parameters (32). The formula accurately predicts that resin T increases as vinyl alcohol content increases, and decreases as vinyl acetate content and aldehyde carbon chain length increases. 

Other. Vinyl acetate resins are useful as antishrinking agents for glass fiber-reinforced polyester mol ding resins (165). Poly(vinyl acetate)s are also used as binders for numerous materials, eg, fibers, leather (qv), asbestos, sawdust, sand, clay, etc, to form compositions that can be shaped with heat and pressure. Joint cements, taping compounds, caulks, and fillers are other uses. 

Several approaches have been disclosed to make release coatings that can be printed with ink jet or laser jet printers (e.g., to make linerless labels). For example, Khatib and Langan [164] disclose a blend of two different acrylate functional silicones, one with a high level of acrylate functionality to provide the printability and one with a low level of acrylate functionality to provide easy PSA release. Lievre and Mirou [165] describe an aqueous blend of a crosslinkable silicone and poly(vinyl alcohol-vinyl acetate) resins while Shipston and Rice describe a blend of acrylic resin and a surfactant [166]. 

The principal field of application for synthetic polymers as art materials is that of paint binders, which developed in the second half of the twentieth century when manufacturers of artists paints and varnishes realized the potential of synthetic resins used in the decorative household and industrial paint market [81]. The most important families of synthetic artists paints are the acrylics, the vinyl acetate resins, and the alkyds, and Py-GC/MS has been used to identify all these types of modem paints. 

Butacite Poly(vinyl acetal) resins DuPont... 

Anhydride modified ethylene promoter (20) vinyl acetate resin, adhesion... 

The residence time is typically in the range of 15 - 60 s. The temperature and pressure are a little lower then in a tubular reactor. Pressures are in the range of 130 - 220 MPa, and the temperatures mostly do not exceed 260°C. When ethylene-vinyl acetate resins are produced, single autoclaves are run at temperatures which are 30 - 50°C lower then in the production of homopolyethylene. 

Unfomuilated poly(vinyl acetal) resins form hard, unpliable materials which are difficult to process without using solvents or plasticizers. Plasticizers aid resin processing, lower the glass-transition temperature, Th, and can profoundly change other physical properties of the resins. 

Vinyl acetate is used for the manufacture of poly(vinyl acetate) resins (Fig. 1), poly( vinyl alcohol), and poly (vinyl butyral). Poly (vinyl acetate) is used primarily in adhesives, coatings, and paints. Copolymers of poly (vinyl acetate) with poly (vinyl chloride) are used in flooring, phonograph... 

Equistar Chemicals L. D. Polyethylene, hijjr pressure tubular LDPE and EVA resins Ethylene, vinyl acetate Resin production for films, injection molding, adhesives and extrusion coating. VA content up to 40%, capacity 150,000 tpy 5 1992... 

Saktirada, I., ed.,"vinyl acetate resin", p77 Kobunshi Kagaiku Pub., Kyoto (1964)... 

VINYLACETATE HOMOPOLYMER VINYX ACETATE POLYMER VINYL ACETATE RESIN VINYL PRODUCTS R 10688 WINACET D... 

Ethyl cellulose plastics Ethylene-vinyl acetate resins Flourohydrocarbon resins Ion exchange resins... 

Only the lowest molecular weight vinyl chloride-vinyl acetate resins have reasonable tolerance for such poor solvents as those above. Figure 28 cites the viscosity characteristics of this type polymer in various MEK diluent blends at 25 wt % solids. 

Germul. [Ceca SA] Acrylic, vinyl-acrylic, or vinyl acetate resins hand modfiets for textile fmishing. 

Anhydride modified ethylene vinyl acetate resin, adhesion promoter ... 

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