Patent · US Expired

Production of low-filler rubber powders by the grinding process

US4157790A · kind A · utility

5Cited by

5References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Otto Benn · Bensberg, DE
Rolf Cornils · Marne, DE
Gerhard Giersiepen · Leichlingen, DE

Key dates

Filing date	Oct 21, 1977
Grant date	Jun 12, 1979
Priority date	—
Expiry date	Oct 21, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2321/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A process for the production of rubber powder having a particle size of from about 200 to 1500 .mu. and a powdering agent content of less than 7% by weight by grinding rubber particles, wherein the rubber is initially mechanically size-reduced into surface-rich and pore-rich particles, the entire quantity of powdering agent is added to the rubber particles, which are then ground at low temperature to prevent the rubber from flowing, non-adsorbed or freshly added powdering agent is adsorbed by the rubber powder in a zone following the grinding machine, and the rubber powder obtained is cooled to such an extent that no warm flow of the rubber occurs.

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