Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2005-08-09
2005-08-09
Berman, Susan (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S307000, C528S308000, C528S308600, C528S406000
Reexamination Certificate
active
06927275
ABSTRACT:
The process of the present invention for producing a polyester resin comprising a dicarboxylic acid constitutional unit and a diol constitutional unit having a cyclic acetal skeleton comprises a step (1) of subjecting a diol (A) having a cyclic acetal skeleton and an ester (D) to transesterification reaction and a step (2) of mainly converting the resultant oligomer into a high polymer. The step (1) simultaneously satisfies the requirements (i) to (iv) as described in the specification. In the process of the present invention, the polyester resins having excellent moldability and mechanical properties are stably produced by a transesterification method which is less detrimental to environments.
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Communication and European Search Report mailed Mar. 10, 2004 for EP No. 03 02 0131.
Hirokane Takeshi
Ikeda Tsuyoshi
Kawashima Takamasa
Kuwahara Shojiro
Oyama Tomohito
Antonelli Terry Stout & Kraus LLP
Berman Susan
Mitsubishi Gas Chemical Co. Inc.
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