The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 1994
Filed:
May. 15, 1992
Richard Sobottka, Worms, DE;
W. R. Grace & Co.-Conn., New York, NY (US);
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.