| 摘要 |
<p>Synthetic plastic compositions, made from a mixture of thermoplastic and a mineral composition containing Cristobalite and aluminum oxide, produce articles that exhibit improved tear and compression strength, while having less weight by using less plastic resin per article. These articles have a more uniform surface with significantly reduced sink marks. The molding machine making articles with these compositions exhibits an increase in throughput. Running these synthetic plastic compositions through injection, extrusion and blow molding machines also cleans and lubricates the screw and the injector nozzles, increasing the life of the mold parts. The elemental composition of the mineral comprises silicon dioxide, aluminum oxide, potassium oxide, iron oxide, calcium oxide, titanium oxide, and trace elements, with the silicon dioxide and aluminum oxide predominating. The majority of the silicon dioxide in the mineral is in the form of Cristobalite. The mineral composition is typically present in amounts of 0.5% or more, by weight of the thermoplastic. The mineral composition is added to the thermoplastic in a manner that provides uniform dispersion throughout the thermoplastic. The mineral may be added as dry power, in particle sizes varying from 6 to 75 microns, to the plastic resin. The mineral composition may also be added directly to the plastic resin in pellet or pellet composition form of various sizes.</p> |
