Method of polycarbonate preparation

    公开(公告)号:US06576739B2

    公开(公告)日:2003-06-10

    申请号:US09735871

    申请日:2000-12-14

    IPC分类号: C08G6400

    CPC分类号: C08G64/24 C07C68/02 C07C69/96

    摘要: High molecular weight polycarbonates are prepared from hindered bisphenols in a reaction sequence involving conversion of the hindered bisphenol to the corresponding bischloroformate and subsequent treatment with an amine catalyst and aqueous base to effect polymerization by hydrolysis and condensation of the bischloroformate groups. Tertiary aliphatic and cycloaliphatic amine catalysts bearing at least one methyl group are found to be especially effective in promoting this polymerization reaction. Reaction rates and selectivities are shown to be superior to known methods employing tertiary amines lacking methyl groups attached to nitrogen, such as triethylamine. The inclusion of chain stoppers allows the preparation of well defined mixtures of polycarbonate oligomers from hindered bisphenols. Additionally, the methodology may be used to prepare symmetrical diaryl carbonates from hindered phenols.

    Method and apparatus for preparing monofunctional aromatic chloroformates suitable for use as chainstopping agents
    9.
    发明授权
    Method and apparatus for preparing monofunctional aromatic chloroformates suitable for use as chainstopping agents 有权
    制备适用于止痛剂的单官能芳族氯甲酸酯的方法和装置

    公开(公告)号:US06392079B1

    公开(公告)日:2002-05-21

    申请号:US09281498

    申请日:1999-03-30

    IPC分类号: C07C6996

    CPC分类号: C07C68/02 C07C69/96

    摘要: A continuous process for the preparation of monofunctional aromatic chloroformates (MAC) having the structure (I) wherein n is an integer from 1 to 5, and R1 represents hydrogen, a branched or unbranched alkyl group having from 1-15 carbon atoms, an aryl group which may be substituted or unsubstituted, a cycloaliphatic group which may be substituted or unsubstituted, or an arylalkyl group which may be substituted or unsubstituted, the method comprising the steps of a) introducing 1) an aqueous caustic solution; 2) a carbonyl chloride; 3) at least one monofunctional hydroxyaromatic compound; and 4) at least one inert organic solvent into a continuous reaction system; and b) effecting contact between 1), 2), 3) and 4) for a time and at conditions sufficient to produce a MAC of structure (I).

    摘要翻译: 制备具有结构(I)的单官能芳族氯甲酸酯(MAC)的连续方法,其中n为1至5的整数,并且R 1表示氢,具有1-15个碳原子的支链或非支链烷基,芳基 可以被取代或未取代的基团,可被取代或未取代的脂环族基团或可被取代或未取代的芳基烷基,所述方法包括以下步骤:a)引入1)苛性碱水溶液; 2)碳酰氯; 3 )至少一种单官能羟基芳族化合物; 和4)至少一种惰性有机溶剂进入连续反应体系; 和b)在足以产生结构(I)的MAC的条件下,在1),2),3)和4)之间进行接触。

    Method and apparatus for preparing monofunctional aromatic chloroformates suitable for use as chainstopping agents
    10.
    发明授权
    Method and apparatus for preparing monofunctional aromatic chloroformates suitable for use as chainstopping agents 有权
    制备适用于止痛剂的单官能芳族氯甲酸酯的方法和装置

    公开(公告)号:US07126022B2

    公开(公告)日:2006-10-24

    申请号:US10141633

    申请日:2002-05-08

    IPC分类号: C07C69/96

    CPC分类号: C07C68/02 C07C69/96

    摘要: The specification describes a continuous process for the preparation of monofunctional aromatic chloroformates (MAC) having the structure (I) wherein n is an integer from 1 to 5, and R1 represents hydrogen, a branched or unbranched alkyl group having from 1–15 carbon atoms, an aryl group which may be substituted or unsubstituted, a cycloaliphatic group which may be substituted or unsubstituted, or an arylalkyl group which may be substituted or unsubstituted.

    摘要翻译: 该说明书描述了制备具有结构(I)的单官能芳族氯甲酸酯(MAC)的连续方法,其中n是1至5的整数,R 1代表氢,支链或非支链烷基 具有1-15个碳原子的基团,可被取代或未取代的芳基,可以被取代或未取代的脂环族基团,或可被取代或未取代的芳基烷基。