B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 43/00 (2006.01) B29C 43/52 (2006.01) C08J 3/12 (2006.01)
Patent
CA 2079795
WO 92/13698 - 14 - PCT/AT91/00091 ABSTRACT Translucent, pore-free sintered aromatic polyesters made from diphenols such as 1,1-bis(4-hydroxyphenyl)fluorene and phthalic-acid halides evince one or more glass transition points in the range of 220 to 400° C and a tensile strength larger than 40 N/mm2 but advantageously larger than 60 N/mm2. They also evince higher resistance to some solvents such as carbon tetrachloride when in the form of poured films as regards the same material. To manufacture the sintered article, the polyester powder is subjected in a closed mold to a pressure larger than 3,000 N/cm2, the mold meantime being slowly heated and then kept for an appreciable time above the glass transition point and there- upon being slowly cooled. As a rule the sintered articles are used as semi-finished products or as pre-formed component-blanks from which the desired end products are made by mechanical cutting.
Fetherstonhaugh & Co.
Isonova Technische Innovationen Gesellschaft M.b.h.
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