Process of making polyester prepolymer

Details Process of making polyester prepolymer Process of making polyester prepolymer

1996-12-12

1998-07-28

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528274, 528296, 528298, 528300, 528301, 528302, 528307, 528308, 5283086, 528484, 528491, 528501, 528503, 526 67, 526 68, C08G 6302

Patent

active

057864438

ABSTRACT:
A continuous process for preparing polyester prepolymer comprising the steps of esterifying a diacid with a diol, reacting the esterified product with additional diol, and passing the product downward through a countercurrent column reactor while inert gas flows upward through the column reactor. The resulting prepolymer product has fewer acid end groups than the esterified material.

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