GENERAL INFORMATION

PVOH 452 has been specially developed for use as a primary suspending agent for vinyl chloride suspension polymerisation. Using our exclusive batch process which in that it allows more efficient control over the degree of hydrolysis and particle size of product. PVOH 452 has high molecular weight and high viscosity in the grade.

USES

Specifically, PVOH 452 is a suspending agent for suspension polymerisation of vinyl chloride monomer (VCM).

STORAGE

1.PVOH 452 should be stored away from wet areas and naked flames. Ingress of moisture should be avoided to maintain product quality.

2.As supplied, the product should remain fit for use for 12 months from the date of delivery. Beyond that date, the material may still be fit for use, but we would advise that it is good practice to test the material. As such, we advise that material stored for 12 months or more after delivery should be tested before use.

3.Aqueous solutions of PVOH 452 if stored for long periods at elevated temperatures are prone to mould and bacterial attack.

FOR USED IN VCM SUSPENDING POLYMERISATION

PVOH 452 has an influence on the PVC resin grain size distribution, porosity and bulk density. This is due to the products surface active nature, reducing the interfacial tension and enhancing distribution of initiator throughout the batch.

The principal advantages of using PVOH 452 can be summarized as follows.

1.The desired PVC grain size can be achieved using low levels of PVOH 452, over a wide range of polymerisation temperatures, to produce high bulk density resins.

2.The PVC grains made with PVOH 452 tend to be more spherical such that higher bulk density may be combined with minimum reduction in porosity and with optimum flow characteristic.

3.The combination of PVOH 452 and PVOH HPMC-50 or secondary suspending agent grades give PVC resins of narrow grain size distribution and a good balance of bulk density and porosity.