B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 43/00 (2006.01) B29B 13/00 (2006.01) C08L 67/03 (2006.01)
Patent
CA 2050310
(57) Abstract Sintered compacts made of aromatic polyesters, produced from diphenols such as 1,1-bis(4-hydroxyphenyl)-1-phenyle- thane or 9,9-bis(4-hydroxaphenyl)fluorene, as well as phthalic acid halides, have one or several glass transition temperatures be- tween 220 and 400 °C and a tensile strength above 40 N/mm2, preferably above 60 N/mm2. In order to produce the sintered compacts, the polyester powder is subjected to a pressure above 3000 N/cm2 in a closed mould. The mould is slowly heated, then maintained for a longer period above the glass temperature and slowly cooled down once again. While it cools, pres- sure can be reduced. Cross linking occurs in the polyester mass during sintering, increasing the fastness to solvents. These sintered compacts are generally useful as semi-finished products or preformed prefabricated elements, from which the de- sired articles can be produced by machining.
Fetherstonhaugh & Co.
Fialla Peter
Isonova Technische Innovationen Ges. M.b.h.
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