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Salient: Victoria University Students' Paper. Vol. 29, No. 6. 1966.

Vinyl resins

Vinyl resins

As paint vehicles the vinyl res ns form two types:—

(i) Emulsion.

(ii) Solution.

The emulsion type, as vinyl acetate, has been discussed with the acrylic emulsions above.

The solution type polyvinyl chloride resin, is used in New Zealand but all resins are imported. Basically they arc high molecular weight, copolymers of vinyl chloride with vinyl acetate. The vinyl acetate is introduced into the polyvinyl chloride chain to ensure adequate solubility in solvents and ensure adequate adhesion. There is not a great deal of activity with the polyvinyl chloride resins for surface coatings. They are characterised by high water resistance and chemical inertness.

In the plastic field many high polymer resins available today could be classed as vinyl. The basic buildine block of CHX = CHX as nart of the molecule would include polyvinyl chloride, polyethylene, polystyrene, polyvinyl alcohol, the maleates and the acrylics. The groun comprising polyethylene, nolvstyrene and polyvinyl chloride accounts for at least half the total plastic resin market. All these materials are imported ready for use and are processed to the required article such as in calendering to produce thin sheeting, extrusion to form pipes e.g. rigid PVC guttering, and flexible PVC for floor tiles, cable covering etc.. injection moulding. e.g., high impact stvrene for film viewers, women's shoe heels tovs. and manv other articles. The field is large and all thes processes form hart of the New Zealand industry.