Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2007-04-24
2007-04-24
Choi, Ling-Sui (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S286000, C528S285000, C528S275000, C502S155000, C502S162000, C502S152000, C502S150000, C502S208000
Reexamination Certificate
active
10049438
ABSTRACT:
This invention provides a novel polycondensation catalyst using no antimony compound, polyester produced by using the same, and a process for producing polyester. A novel catalyst comprising an aluminum compound and a phosphorus compound is used as the polycondensation catalyst in producing polyester. The polyester of this invention can be applied to fibers for clothes, fibers for industrial materials, various films, sheets and molded articles such as bottles and engineering plastics, as well as coatings and adhesives.
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“Experimental Results: 1. PET Polymerization Experiment using Aluminum Acetylacetonate/Lithium Acetate (0.014 mol-%/0.025 mol-%) as catalyst; 2. PET Polymerization Experiment using Aluminum Acetylacetonate/Lithium Acetate (0.014mol-%/0.1 mol-%) as catalyst,” conducted by (Exp. 1, polymerization) M. Kuwata (according to direction of T. Nakajima), Sep. 9, 1999; (Exp. 1, measurement of TD) T. Nakajima, Oct. 26, 1999; (Exp. 2, polymerization) M. Kuwata (according to direction of T. Nakajima), Jun. 14, 2000; (Exp. 2, measurement of TD) T. Nakajima, Aug. 11, 2000.
Gyobu Shoichi
Kuwata Mitsuyoshi
Nakajima Takahiro
Tsukamoto Ken-ichi
Choi Ling-Sui
Kenyon & Kenyon LLP
Lee Rip A.
Toyo Boseki Kabushiki Kaisha
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