Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1990-06-15
1992-04-07
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
264126, 26433121, 528176, 528194, B27J 500, C08J 500, C08G 6302
Patent
active
051029740
ABSTRACT:
Sintered bodies made of aromatic polyesters prepared from diphenols, such as 1,1-bis(4-hydroxyphenyl-1-phenylethane or 9,9-bis(4-hydroxyphenyl)fluorene, and halides of phthalic acid which have one or more glass transition temperatures in the range of 220.degree.-400.degree. C. and tensile strengths higher than 40 N/mm.sup.2, and advantageously higher than 60 N/mm.sup.2 are disclosed. To make the sintered bodies, polyester powder is exposed to high pressure within a closed mold and the temperature of the polyester powder is slowly increased by heating until a temperature higher than the glass transition temperature is reached, whereafter the polyester is slowly cooled. During the sintering process the polyester is crosslinked which results in an increased resistance against solvents. The sintered bodies of the invention are used in general as semi-finished products or preformed parts, which will be transformed to bodies with required shapes through subsequent machining.
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Anderson Harold D.
Isonova Technische Innovationen Ges.m.b.H.
Mosley T.
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