Process for the production of a free flowing, powdered elastomer filled with silicic acid

US4757101A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Walter Kleinert · Velen, DE
• Michael Mueller · Bensheim, DE
• Klaus-Rudolf Meyer · Hattingen, DE
• Guenter Huhn · Marl, DE
• Juergen Simon · Marl, DE

Key dates

• Filing date: Mar 2, 1987
• Grant date: Jul 12, 1988
• Expiry date: Mar 2, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K3/36
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process produces a free flowing, silicic-acid-filled, powdered elastomer wherein the silicic acid employed has the properties set out below: PA0 (a) SiO.sub.2 content: about 82-91.5% by weight; PA0 (b) metallic oxides: about 0.5-3% by weight; PA0 (c) loss on ignition (DIN 55 921/2--measured at 100.degree. C.): about 8-15% by weight; PA0 (d) moisture (DIN 53 198--measured at 105.degree. C.): about 2-10% by weight; PA0 (e) surface area of the primary particles according to BET: about 40-250 m.sup.2 /g; PA0 (f) dibutyl phthalate absorption (ASTM D 2414-79) based on measured weight: about 170-290%. PA0 (g) linear average of numerical distribution of secondary particles: about 10-2,000 nm; PA0 (h) linear average of volume distribution of secondary particles: about 3-30 um; PA0 (i) proportion of secondary particles with a diameter of less than 1 um: about 0.01-5% by weight wherein the percentages of parameters (a) to (c), added up together, must yield 100% by weight.