Process for direct esterification of terephthalic acid with an alkylene glycol
    3.
    发明授权
    Process for direct esterification of terephthalic acid with an alkylene glycol 失效
    使用亚苄基甘露糖直接纯化三十一酸的方法

    公开(公告)号:US3641111A

    公开(公告)日:1972-02-08

    申请号:US3641111D

    申请日:1969-01-31

    Applicant: ALLIED CHEM

    CPC classification number: C07C69/82 C07C67/08

    Abstract: DIRECT ESTERIFICATION OF TEREPHTHALIC ACID AND AN ALKYLENE GLYCOL IS EXPEDITED BY FORMING A FINE DISPERSION OF THE INGREDIENTS AIDED BY A DISPERSING AND WETTING AGENT. THE ESTERIFICATION REACTION CAN BE CARRIED OUT IN THE PRESENCE OF A SMALL QUANTITY OF A SOLVENT WHICH CAUSES SUCCESSIVE QUANTITIES OF ACID TO ENTER THE LIQUID PHASE AND TO REACT TO FORM MOLTEN ESTERS WHICH THEN INCREASE THE TOTAL QUANTITY OF LIQUID PHASE PRESENT IN THE MIXTURE. THE PROCESS ENABLES THE ESTERIFICATION REACTION TO BE CARRIED OUT PRACTICALLY AT ATOMOSPHERIC PRESSURE OR TO BE CARRIED OUT AT SUPER ATMOSPHERIC PRESSURE IN A SHORTER TIME SPAN THAN IS THE CASE IN ESTERFICATION PROCESSES HERETOFORE AVAILABLE.

    Process for the preparation of linear condensation polyesters
    6.
    发明授权
    Process for the preparation of linear condensation polyesters 失效
    制备线性聚合聚酯的方法

    公开(公告)号:US3689461A

    公开(公告)日:1972-09-05

    申请号:US3689461D

    申请日:1969-09-18

    Applicant: ALLIED CHEM

    CPC classification number: C08G63/78 C08G63/785

    Abstract: A HIGH MOLEUCULAR WEIGHT LINEAR CONDENSATION POLYESTER IS PREPARED FROM A POLYCARBOXYLIC ACID AND A POLYOL BY (A) ESTERIFYING SAID POLYCARBOXYLIC ACID WITH SAID POLYOL BY SUBJECTING TO CONDITIONS OF DIRECT ESTERIFICATION A FLOWABLE, UNIFORM DISPERSION COMPRISED OF (1) A PASTE OF THE SAID POLYCARBOXYLIC ACID AND THE SAID POLYOL, AND (2) AT LEAST 3 PARTS BY WEIGHT PER PART PASTE OF A PARTIALLY ESTERIFIED PRODUCT OF SAID POLYCARBOXYLIC ACID WITH SAID POLYOL, AND THENCE (B) FURTHER ESTERIFYING AND POLYCONDENSING THE ESTERIFICATION PRODUCT OF STEP (A) UNTIL THERE IS OBTAINED AN IMPROVED POLYESTER OF THE DESIRED MOLECULAR WEIGHT.

    Polyester process
    8.
    发明授权
    Polyester process 失效
    聚酯工艺

    公开(公告)号:US3705133A

    公开(公告)日:1972-12-05

    申请号:US3705133D

    申请日:1969-08-21

    Applicant: ALLIED CHEM

    CPC classification number: C08G63/866

    Abstract: A PROCESS FOR THE PREPARATION OF COLORLESS, LINEAR HIGH MOLECULAR WEIGHT FILM AND FIBER-FORMING POLYALKYLENE TEREPHTHALATES EITHER BY DIRECT ESTERIFICATION OR ESTERINTERCHANGE OF TEREPHTHALIC ACID AND/OR THE LOWER ALKYL ESTERS THEREOF WITH A GLYCOL HAVING 2 TO 10 CARBON ATOMS PER MOLECULE TO OBTAIN THE CORRESPONDING DIGLYCOL-ESTER INTERMEDIATE AND THEN CONDENSING SAID INTERMEDIATE IN THE PRESENCE OF A CATALYTIC AMOUNT OF A LEAST ONE TRIVALENT ANTIMONY SALT OF A HIGHER ALIPHATIC MONOCARBOXYLIC ACID HAVING AT LEAST 12 CARBON ATOMS PER MOLECULE.

Patent Agency Ranking