公开(公告)号：WO1995024252A1

公开(公告)日：1995-09-14

申请号：PCT/US1995000420

申请日：1995-01-12

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  CUMMINGS, Clark, J. ,  MEISTER, Bernard, J.

IPC: B01D03/06

CPC classification number: F28D9/0062 ,  B01D1/221 ,  B01D3/06 ,  C08F6/00 ,  F28D7/0041 ,  F28D9/0018 ,  F28F3/086 ,  F28F13/08 ,  Y10S159/10

Abstract: An improved polymer devolatilization apparatus comprising a flat plate heater (22) comprising a polymer solution supply means (20), and a liquid/vapor collection and separation means, said flat plate heater further comprising a multiplicity of flat plates defining a plurality of channels (10), each channel having a substantially uniform height, but varying width over the total channel length, each channel comprising three zones: a first zone (12), having a beginning (18) and a terminus, said beginning in operative communication with the polymer solution supply means, characterized by decreasing width as a function of distance from its beginning, a second zone (14) having a beginning at the terminus of the first zone and a terminus, characterized by at least one occurrence of a restrictive cross-sectional area, and a third zone (16) having a beginning at the terminus of the second zone and terminating at a liquid/vapor collection and separation region operating at reduced pressure, said third zone characterized by increasing width as a function of distance from its beginning, and provided further that the ratio of maximum width of the third zone to the maximum width of the second zone is from 2:1 to 20:1.

Abstract translation: 一种改进的聚合物脱挥发装置，包括包括聚合物溶液供应装置（20）的平板加热器（22）和液体/蒸汽收集和分离装置，所述平板加热器还包括限定多个通道的多个平板 每个通道具有基本均匀的高度，但在总通道长度上具有变化的宽度，每个通道包括三个区域：具有开始（18）和末端的第一区域（12），所述第一区域（12）开始与 聚合物溶液供应装置，其特征在于将宽度从其开始减小为距离的函数;第二区域（14），其具有在第一区域的末端的起始点和末端，其特征在于至少一次出现限制性横截面 区域和第三区域（16），其具有在第二区域的末端处的开始并且终止于在减压下操作的液体/蒸气收集和分离区域，所述第二区域 第三区域的特征在于宽度随着距离开始的距离而增加，并且进一步提供了第三区域的最大宽度与第二区域的最大宽度的比率为2:1至20:1。

公开(公告)号：WO1992004386A1

公开(公告)日：1992-03-19

申请号：PCT/US1991005195

申请日：1991-07-23

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  MAURER, Brian, R. ,  CUMMINGS, Clark, J. ,  MUELLER, Karen

IPC: C08F08/30

CPC classification number: C08F8/48 ,  C08F2800/10 ,  C08F8/32 ,  C08F220/14 ,  C08F212/08

Abstract: A process for preparing glutarimide resins by the amidization and cycloimidization of methacrylate resins in the presence of a solvent characterized in that the solvent consists essentially of cyclohexanol.

公开(公告)号：WO1993003083A1

公开(公告)日：1993-02-18

申请号：PCT/US1992006479

申请日：1992-08-04

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  MUNJAL, Sarat ,  CUMMINGS, Clark, J. ,  KAO, Che-I

IPC: C08G64/10

CPC classification number: C08G64/10 ,  C08G64/20

Abstract: A process for preparing halogenated polycarbonate wherein the total amount of base, the end pH of the aqueous phase, and the amount of coupling catalyst employed in the reaction are controlled to selected levels. In one embodiment, carbonate oligomers are condensed to form polycarbonate by contacting said oligomers in a tank reactor with an (i) organic solvent; (ii) 50 weight parts per million or less of coupling catalyst, based on the weight of all organic solvent employed in the oligomer formation and condensation steps, including any in which the coupling catalyst may be dissolved; and (iii) an amount of base which, together with the amount of base employed in the oligomer formation step, brings the total moles of base employed in the oligomer formation and condensation steps per mole of dihydroxy compound to the number given by 2 + 4(Y-1) + Q, where Y is the number of moles of carbonate precursor per mole of dihydroxy compound, and Q is about 0.001 to about 0.2. In another embodiment, carbonate oligomers are condensed to form polycarbonate by contacting said oligomers in a tubular reactor with an (i) organic solvent; (ii) 150 weight parts per million or less of coupling catalyst, based on the weight of all organic solvent employed in the oligomer formation and condensation steps, including any in which the coupling catalyst may be dissolved; and (iii) an amount of base which, together with the amount of base employed in the oligomer formation step, brings the total moles of base employed in the oligomer formation and condensation steps per mole of dihydroxy compound to the number given by 2 + 4(Y-1) + Q, where Y is the number of moles of carbonate precursor per mole of dihydroxy compound, and Q is about 0.001 to about 0.5. The process yields a halogenated polycarbonate of desirably high weight molecular weight, for example in excess of 80,000.

公开(公告)号：WO1995015344A1

公开(公告)日：1995-06-08

申请号：PCT/US1994012691

申请日：1994-11-04

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  CUMMINGS, Clark, J. ,  HATHAWAY, Paul, E.

IPC: C08F12/04

CPC classification number: C08F12/04 ,  C08F2/38

Abstract: A process for producing a monovinylidene aromatic polymer having molecular weight (Mw) greater than 275,000 which comprises polymerizing a monomer mixture comprising a monovinylidene aromatic monomer in the presence of: A) from 10 to 2000 ppm by weight of at least one free radical generating, branching polymerization initiator; and B) from 10 to 2000 ppm of one or more organic gel reduction agent selected from the group consisting of: 1) mercaptans, terpenes, halocarbons and halohydrocarbons, such agent having up to 20 carbons; 2) distillate recovered from the reaction devolatilization process (recycle); and 3) mixtures of 1) and 2).

Abstract translation: 一种制备分子量（Mw）大于275,000的单亚乙烯基芳族聚合物的方法，该方法包括在以下存在下聚合包含单亚乙烯基芳族单体的单体混合物：A）10-2000ppm重量的至少一种产生自由基的自由基， 支化聚合引发剂; 和B）10至2000ppm的一种或多种选自以下的有机凝胶还原剂：1）硫醇，萜烯，卤代烃和卤代烃，这种具有至多20个碳原子的试剂; 2）从反应脱挥发过程中回收的馏出物（回收）; 和3）1）和2）的混合物。