Grace Gmbh

W. R. Grace Co.-conn.

Georg Luers

Andreas Schmidt

Richard Sobottka

Heiko Zeh

Rita Schneider

Richard Sobuttka

Peter Belligoi

Rex Field

Gerd W Scheuren

The present invention relates to an integrated additive composition which contains anti-blocking agents and at least one organic component and is characterized in that the organic component(s) is (are) localized in a concentration of 5 to 65 wt.-%, relative to the total weight of the composition, in the pores of the anti-blocking agent, the volume of the organic component(s) not being greater, however, than the pore volume of the anti-blocking agent. The invention also describes processes for the preparation of this integrated additive composition and its use in polyolefin films and in injection molding.

Integrated additive composition, process for its preparation and its use

Matting agent based on aggregated silica

An anti-blocking agent comprising silicon dioxide or mixtures of silicon dioxide and zeolite is described, which is characterized in that it has a bimodal pore size distribution, the first maximum of the bimodal pore size distribution being in the pore size range &lt;5 nm and the second maximum of the bimodal pore size distribution in the pore size range &gt;6 nm. The anti-blocking agent is obtainable by micronizing a mixture comprising silicon dioxide of a certain pore size and silicon dioxide and/or zeolite having a different pore size. It can be produced together with lubricating agent as a combined anti-blocking and lubricating agent. Incorporation of the anti-blocking agent or of the combined anti-blocking agent and lubricating agent into a polymer in the form of a master batch is preferable. In addition to a better dispersion and distribution of the anti-blocking agent particles in films and the improved optical properties associated therewith, the particular advantage of the anti-blocking agent according to the invention is that the adsorption of lubricating agent is avoided or greatly reduced, so that less lubricating agent can be used than in the prior art.

Anti-blocking agent and process for its manufacture

An anti-blocking agent comprising silicon dioxide or mixtures of silicon dioxide and zeolite is described, which is characterized in that it has a bimodal pore size distribution, the first maximum of the bimodal pore size distribution being in the pore size range&lt;5 nm and the second maximum of the bimodal pore size distribution in the pore size range&gt;6 nm. The anti-blocking agent is obtainable by micronizing a mixture comprising silicon dioxide of a certain pore size and silicon dioxide and/or zeolite having a different pore size. It can be produced together with lubricating agent as a combined anti-blocking and lubricating agent. Incorporation of the anti-blocking agent or of the combined anti-blocking agent and lubricating agent into a polymer in the form of a master batch is preferable. In addition to a better dispersion and distribution of the anti-blocking agent particles in films and the improved optical properties associated therewith, the particular advantage of the anti-blocking agent according to the invention is that the adsorption of lubricating agent is avoided or greatly reduced, so that less lubricating agent can be used than in the prior art.

A universally applicable SiO.sub.2 -flatting agent is described, which consists of SiO.sub.2, 1 to 25% by weight polyol and optionally 1 to 25% by weight wax. The novel flatting agent is, even after lengthy storage, especially at pressure, still easily dispersible, does not lead to the formation of a hard sediment with non-thixotropic paints and lacquers, and has practically no negative effect on the thixotropic behaviour of paints and lacquers based on thixotropic polyamide-modified alkyd resins. The SiO.sub.2, polyol and wax can be brought together in a variety of ways, e.g. during the micronization of the SiO.sub.2 in a jet-mill or mechanical mill by adding polyol and wax at the same time, by spray-drying a suspension of SiO.sub.2 in an aqueous polyol solution or even before drying by adding polyol during washing or an earlier production step. It is also possible to spray-dry a suspension of SiO.sub.2, wax emulsion and polyol.

SiO.sub.2 flatting agent, process for its production and its use

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 particularly apparent in the economic field because compared with the prior art, only a single concentrate is required which, due to the high lubricant concentration, need only be used in much smaller quantities.

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Westhofen, Germany

Georg Luers