Preparation method of polyester resin

Details Preparation method of polyester resin Preparation method of polyester resin

2007-09-18

2007-09-18

Truong, Duc (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S308100, C528S308300, C528S308800, C528S485000, C528S486000, C528S50200C, C430S109500, C430S137170, C428S402000, C428S424400

Reexamination Certificate

active

11227080

ABSTRACT:
A preparation method of a polyester resin includes: under predetermined depolymerization conditions, mixing a polyester resin, a resin dissolvent and a polycondensation catalyst to depolymerize the polyester resin and form a first reaction mixture; adding a first monomer to the first reaction mixture to form a second reaction mixture; under predetermined polymerization conditions, adding a second monomer to the second reaction mixture to polymerize the depolymerized polyester resin and form a third reaction mixture; and adding a neutralizing agent to neutralize the polymerized reaction product of the third reaction mixture.

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European Search Report dated Nov. 23, 2005 for corresponding European Patent Application No. 05255829.3 filed on Sep. 21, 2005.
Chinese Patent Office Action, mailed Feb. 9, 2007, and issued in corresponding Chinese Patent Application No. 2005101097842.

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