Combined antiblocking and lubricant concentrate

US4675122A · kind A · utility

Assignee

• Grace GmbH · DE

Inventors

• Georg Luers · Westhofen, DE
• Richard Sobottka · Worms, DE

Key dates

• Filing date: Oct 11, 1984
• Grant date: Jun 23, 1987
• Expiry date: Oct 11, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2423/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Combined antiblocking agent and lubricant concentrate based on polyolefin, which contains diatomaceous earth, precipitated silica and/or silica gel as the antiblocking agent, one or more amides of unsaturated C.sub.18 -C.sub.22 -fatty acids and optionally further conventional additives and which is characterized in that it contains 5 to 35% by weight of antiblocking agent and 5 to 30% by weight of lubricant. The high lubricant concentration in the combination concentrate according to the invention is obtained in that the antiblocking agent and the lubricant are incorporated into the polyolefin in the form of a homogeneous, finely divided mixture. The antiblocking agent serves as a carrier for the micronized lubricant, i.e. the lubricant is adsorbed on the large surface of the antiblocking agent, so that the "flowing away" of the lubricant otherwise observed in the case of high lubricant concentrations during incorporation into the polyolefin is avoided. The concentrate according to the invention is more particularly suitable for use in the production of polyolefin films. Apart from action improvements, the advantages of the concentrate according to the invention are more particular…