VINYL ESTER COPOLYMER

We make polyethylene resins using two basic types of chain growth reaction free radical polymerization and coordination catalysis. We use free radical polymerization to make low density polyethylene, ethylene-vinyl ester copolymers, and the ethylene-acrylic acid copolymer precursors for ethylene ionomers. We employ coordination catalysts to make high density polyethylene, linear low density polyethylene, and very low density polyethylene. 

These comprise components A to C, the amount of component B being 5 to 50 pbw per 100 pbw of A (based on solid content) and the amount of C being 50 to 350 pbw per 100 pbw of A (based on solid content). A is an emulsion of ethylene-vinyl ester copolymer, which is composed of 5 to 35 wt.% of ethylene and 95 to 65 wt.% of vinyl ester, and has a Tg of -25 to -I-15C and a toluene-insoluble part of 30 wt.% or more. B is a thermal expansive hollow microbead and C is an inorganic filler. The emulsion has superior mechanical strength, crack resistance, water resistance, alkali resistance, blocking resistance, foaming property, embossing property and superior flame resistance and can be used for flameproof foam sheet for wallpaper. 

A foamable composition nsefnl for rotational moulding is described, which advantageonsly inclndes an ethylene vinyl ester copolymer as an additive. The additive beneficially has a higher melt index than the base resin of the composition. 

Classification Vinyl ester copolymer Formula (C4H6O2 C4He02)x Properties Beads sol. in anhyd. ethanol salt form sol. in water dens. 1.170 soften, pt. 80-100 C Toxicology LD50 (oral, rat) >18150 pl/kg may be harmful by inh., ing., or skin absorption may cause irritation to eyes, skin, mucous membranes, upper respiratory tract TSCA listed... 

Fig. 4 Structural Features of Lumiflon Polymer Fluoroolefin-Vinyl Ester Copolymer...

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