Anti-blocking agent containing modified amorphous silica

Details Anti-blocking agent containing modified amorphous silica Anti-blocking agent containing modified amorphous silica

1992-05-15

1994-11-22

Chaudhuri, Olik

Compositions

Electrolytes for electrical devices

106491, 2523152, 423338, 423339, C08K 516

Patent

active

053666453

ABSTRACT:
A modified amorphous silica is described which, apart from optionally present usual additives, comprises 40 to 85 wt-% silica and 60 to 15 wt-% paraffin, silicone or vegetable oil and/or ethylene glycol. The modified amorphous silica is prepared by bringing together, apart from optionally present usual additives, silica with such a quantity of paraffin, silicone or vegetable oil and/or ethylene glycol that the finished, modified silica has a paraffin, silicone or vegetable oil and/or ethylene glycol content of 60 to 15 wt-%. The modified amorphous silica is suitable as an anti-blocking agent, which can be advantageously prepared as concentrate (masterbatch). Surprisingly, upon preparing such a concentrate the melt-flow index hardly falls compared with the melt-flow index of the polyolefin which forms the basis of the concentrate. Thus it is possible to incorporate large quantities of the modified silica into the concentrate in very homogeneous distribution. This in turn has a favourable effect on the use of the concentrate for the manufacture of films.

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Satish K. Wason, Pigment Handbook vol. 1: Properties and Economics 2d Ed., Peter Lewis (Ed.), John Wiley & Sons, Inc. (1988) pp. 175-181.
The Chemistry of Silica, Ralph K. Iler, John Wiley & Sons, New York (NY), 1979, p. 493.

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