GENERAL INFORMATION
PVOH®8848 is a 88mole% hydrolyzed, polyvinyl alcohol which 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®8848 has high molecular weight and high viscosity in the grade.
USES
Specifically, PVOH®8848 is a suspending agent for suspension polymerisation of vinyl
chloride monomer (VCM).
STORAGE
1.PVOH®8848 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®8848 if stored for long periods at elevated temperatures are
prone to mould and bacterial attack.
FOR USED IN VCM SUSPENDING POLYMERISATION
PVOH®8848 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®8848 can be summarized as follows.
1.The desired PVC grain size can be achieved using low levels of PVOH®8848, over a wide
range of polymerisation temperatures, to produce high bulk density resins.
2.The PVC grains made with PVOH®8848 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®8848 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.
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