Patent · US Expired

Silica xerogels

US4053565A · kind A · utility

17Cited by

8References

2Claims

0Family size

Assignee

National Petro Chemicals Corporation · US

Inventors

Jerome H. Krekeler · Cincinnati, US
William Kirch · De Witt, US
Henri A. Aboutboul · Brussels, BE

Key dates

Filing date	Jan 28, 1974
Grant date	Oct 11, 1977
Priority date	—
Expiry date	Jan 28, 1994

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J35/651
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Silica xerogels having pore volumes greater than about 2.0 cc/g., the major portion of which volumes are provided by pores having pore diameters ranging from 300 to 600 A, and surface areas ranging from 200 to 500 m.sup.2 /g. Xerogels having such cumulative pore volume, pore diameter distribution, and surface area characteristics are useful as supports for stereospecific catalysts for particle form olefin polymerization reactions effecting the production of low molecular weight, high melt index polyolefins.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.