Patent application number | Description | Published |
20080200643 | METHOD FOR REDUCING THE CONTENT OF FLUORESCENT PARTICLES IN POLYCARBONATE - A method for reducing the content of fluorescent particles in polycarbonate is disclosed. The method entails bringing into contact polycarbonate, in the melt or in solution, with aluminosilicate at a temperature and for a time calculated to obtain polycarbonate having fluorescent particles content of 0 to 5 counts/g of polycarbonate. In a preferred embodiment the polycarbonate is passed through a column packed with zeolite. | 08-21-2008 |
20080210343 | Process for treatment of metal surfaces - A process for treating the working surfaces of equipment used in the production and processing of polycarbonate is disclosed. The thermal treatment in an oxidative atmosphere results in resin and molded articles having improved optical quality. | 09-04-2008 |
20080249234 | Modified Polycarbonates, Polyester Carbonates and Polyesters Having Improved Elongation Behaviour and Flame Resistance - The present invention relates to polycarbonate, polyester carbonate and polyester having end groups derived from alkylsiloxane-substituted phenols, as well as to the use of phenolic compounds having alkylsiloxane substituents as chain terminators in the preparation of polycarbonate, polyester carbonate and polyester, as well as to mouldings and extrudates produced from these polymers, to processes for the preparation of the polymers, and to novel phenolic compounds of formula (2). | 10-09-2008 |
20110127468 | Polycarbonate for making extruded films that are virtually free of surface defects - Linear polycarbonate resin virtually free of surface defects that impair the suitability of the resin for demanding optical application is disclosed. Also disclosed is a process for the manufacture of the resin. The surface defects included in the resin are in the form of transparent fluorescing particles, the particle count of which portion that are 15 and 250 μm in size, is up to 1.8 counts/g, said count being determined by exciting the residue remaining after filtering a solution of said polycarbonate in methylene chloride through a Teflon filter of 5 μm pore size at a wavelength of 400-440 nm, 25× overall magnification and illumination time of 40 millisec. The polycarbonate is suitable for making films of improved optical properties. | 06-02-2011 |
20110143126 | POLYCARBONATE BLENDS HAVING HIGH HEAT DISTORTION RESISTANCE AND IMPROVED SURFACE PROPERTIES - The present invention relates to compositions containing copolycarbonates comprising bisphenol A and TMC bisphenol building blocks and specific polyolefins or functionalized polyolefins. The invention also relates to mouldings and injection moulded parts and extrudates obtainable from these compositions, and to processes for the production of the mouldings and extrudates. The invention furthermore relates to multilayer products comprising a substrate containing the polycarbonate according to the invention, which has a further layer at least on one side, preferably a metal layer, and processes for the production of such products. | 06-16-2011 |