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公开(公告)号:US3940367A
公开(公告)日:1976-02-24
申请号:US495190
申请日:1974-08-06
摘要: Low-molecular polyesters prepared by the condensation of diols and dicarboxylic acid dialkyl esters show a substantially improved capactiy to undergo polycondensation in a susequent polycondensation below the melting point if said low-molecular polyesters are prepared from pressure trans-esterification products by polycondensation in the melt.
摘要翻译: 通过二醇和二羧酸二烷基酯的缩合制备的低分子聚酯显示出显着提高的能量,以在低于熔点的低温缩聚中进行缩聚,如果所述低分子量聚酯通过在熔体中缩聚的压力转酯化产物 。
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公开(公告)号:US4299948A
公开(公告)日:1981-11-10
申请号:US097272
申请日:1979-11-26
申请人: Kurt Weirauch , Alfred Horbach , Hugo Vernaleken
发明人: Kurt Weirauch , Alfred Horbach , Hugo Vernaleken
摘要: The subject of the instant invention are polycarbonates based on diphenols of the formula I ##STR1## wherein Y is a single bond, an elkylene- or alkylidene-radical with 1 to 7 carbon atoms, a cycloalkylene- or cycloalkylidene-radical with 5 to 12 carbon atoms, ##STR2## which have weight average molecular weights (M.sub.LS) measured by light scattering of at least 15 000 and which are characterized in having an average of zero to 1.5 mols, preferably 0.3 to 1.0 mols and especially 0.3 to 0.8 mols endgroups per mol polycarbonate.The subject of instant invention is also a process for preparing these polycarbonates according to the interfacial polycondensation method, the polycarbonates thus obtained and the use of the polycarbonates according instant invention for the preparation of compounds and films.
摘要翻译: 本发明的主题是基于式I(I)的二酚的聚碳酸酯,其中Y是单键,具有1至7个碳原子的亚烷基或亚烷基 - 亚基,具有 5至12个碳原子,其具有通过光散射测量的至少15000的重均分子量(MLS),其特征在于平均为0至1.5摩尔,优选为0.3至1.0摩尔,特别是0.3至1.0摩尔 每摩尔聚碳酸酯0.8摩尔端基。 本发明的主题也是根据界面缩聚方法制备这些聚碳酸酯的方法,由此获得的聚碳酸酯以及根据本发明的聚碳酸酯用于制备化合物和膜的用途。
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公开(公告)号:US3939118A
公开(公告)日:1976-02-17
申请号:US508948
申请日:1974-09-24
申请人: Alfred Horbach , Hugo Vernaleken
发明人: Alfred Horbach , Hugo Vernaleken
CPC分类号: C08G64/406 , Y10S260/33
摘要: The contaminating inorganic compounds such as alkali metal salts or alkali metal hydroxides which remain in a polycarbonate solution prepared by reacting phosgene with a dihydroxy-aryl compound are removed by contacting the solution with a molecular sieve.
摘要翻译: 残留在通过光气与二羟基 - 芳基化合物反应制备的聚碳酸酯溶液中的碱金属盐或碱金属氢氧化物的污染性无机化合物通过使该溶液与分子筛接触来除去。
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