Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2011-01-11
2011-01-11
Seidleck, James (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S271000, C528S272000, C528S275000, C528S286000, C528S308100, C528S308300, C502S103000, C502S104000, C502S132000, C502S150000, C502S155000, C502S162000, C428S034100, C428S035700, C428S046000, C428S221000
Reexamination Certificate
active
07868126
ABSTRACT:
This invention provides a polyester and a polyester molded product, which, while maintaining color tone, transparency, and thermal stability, can realize a high polycondensation rate, are less likely to cause the production of polycondensation catalyst-derived undesired materials, and can simultaneously meet both quality and cost effectiveness requirements, which can exhibit the characteristic features, for example, in the fields of ultrafine fibers, high transparent films for optical use, or ultrahigh transparent molded products. These advantages can be realized by using, in the production of a polyester in the presence of an aluminum compound-containing polyester polycondensation catalyst, an aluminum compound having an absorbance of not more than 0.0132 as measured in the form of an aqueous aluminum compound solution, prepared by dissolving the aluminum compound in pure water to give a concentration of 2.7 g/liter in terms of the amount of aluminum element, under conditions of cell length 1 cm and wavelength 680 nm.
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Fuchikami Masaki
Funaki Kenichi
Kageyama Katsuhiko
Katayose Kazuo
Kitagawa Tooru
Kenyon & Kenyon LLP
Seidleck James
Tischler Frances
Toyo Boseki Kabushiki Kaisha
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