Patent · US Expired

Metallurgical silicon containing phosphorus for the preparation of organohalogenosilanes

US5714131A · kind A · utility

8Cited by

8References

8Claims

0Family size

Assignees

Pechiney Electrometallurgie · FR
BAYER HEALTHCARE LLC · DE

Inventors

Thomas Margaria · Cluses, FR
Bruno Degen · Much, DE
Elke Licht · Leverkusen, DE
Manfred Schulze
Gebhard Wagner · Odenthal, DE

Key dates

Filing date	Dec 15, 1995
Grant date	Feb 3, 1998
Priority date	—
Expiry date	Dec 15, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F7/16
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A metallurgical silicon is disclosed which contains substantially from 30 to 180 ppm of phosphorus comprised of a crystalline phase of primary silicon having a dissolved phosphorus content between 30 and 150 parts per million and intermetal phases whose global ratio is between 0.5 and 2%, wherein among the intermediary phases, the phase Si.sub.2 Al.sub.2 Ca does not exceed 0.3% of the total of the metallurgical silicon mass. The metallurgical silcon is used for the synthesis of alkyl or aryl halogenosilanes useful for the preparation of silicones.

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