[EN] METHOD OF PURIFYING DIANHYDRIDES, THE DIANHYDRIDES FORMED THEREBY, AND POLYETHERIMIDES FORMED THEREFROM<br/>[FR] PROCÉDÉ DE PURIFICATION DES DIANHYDRIDES, DIANHYDRIDES AINSI OBTENUS, ET POLYÉTHERIMIDES FORMÉS À PARTIR DE CEUX-CI
申请人:SABIC INNOVATIVE PLASTICS IP
公开号:WO2009120212A1
公开(公告)日:2009-10-01
A method for purifying an oxydiphthalic anhydride comprises diluting a first mixture comprising an oxydiphthalic anhydride, a solvent, a catalyst, and an inorganic salt with a solvent, to provide a second mixture having a solids content of 10 to 30 percent based on total weight of the second mixture; filtering and washing the solids of the second mixture at a temperature below the crystallization point temperature of the oxydiphthalic anhydride to provide a third mixture; hydrolyzing the third mixture by adding water and a water-soluble acid to form a fourth mixture; heating the fourth mixture; then cooling to provide a solid-liquid mixture, optionally decanting a portion of the liquid, re diluting the remaining solid-liquid mixture, then filtering to provide a solid component; washing the solid component with water to provide a fifth mixture of oxydiphthalic tetra acid and water; ring closing the oxydiphthalic tetra acid to provide oxydiphthalic anhydride, and filtering the oxydiphthalic anhydride.
Fluorinated bis(phthalic anhydride) and method for producing the same
申请人:Masuda Go
公开号:US20050020839A1
公开(公告)日:2005-01-27
It is an object of the present invention to provide fluorinated bis(phthalic anhydride) which has less coloration and higher solubility in comparison with conventional compounds, and a method for producing the same. Further, it is also an object of the present invention to provide a method for producing a fluorinated bis(phthalonitrile) compound, which is an intermediate raw material compound of the method for producing the fluorinated bis(phthalic anhydride), and a polyamic acid and a polyimide, which are produced from the fluorinated bis(phthalic anhydride). A fluorinated bis(phthalic anhydride) of the present invention is the fluorinated bis(phthalic anhydride) represented by the following formula (I
1
), wherein its specific surface area is 3.0 m
2
/g or larger. It is also characterized in that its molar absorption coefficient is 0.6 L/mol·cm or less at a wavelength of 360 nm.
[wherein, m and n independently represent integers of 1 to 3, and Z
1
represents a single bond group or a bivalent organic group.]
Fluorine-Containing Polymerizable Monomer And Polymer Compound Using Same
申请人:Central Glass Company, Limited
公开号:US20140148548A1
公开(公告)日:2014-05-29
The present invention provides a fluorine-containing fluorenediamine of the formula (2):
where R
1
represents one kind of substituent group selected from the group consisting of a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a C
1
-C
4
alkyl group, a C
1
-C
4
fluoroalkyl group in which any number of hydrogen atoms can be substituted by a fluorine atom, a phenyl group, a methoxy group and a nitro group; R
2
represents one kind of substituent group selected from the group consisting of a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a phenyl group, a naphthyl group, a biphenyl group, a sulfonic acid group, a —C≡C—C(CH
3
)
2
OH group, a —C≡C—C
6
H
5
group and a —C≡C—Si(CH
3
)
3
group; HFIP represents a —C(CF
3
)
2
OH group; and m and n each independently represent an integer of 0 to 2 and satisfy a condition of 1≦m+n≦4.
[EN] METHODS OF MANUFACTURE OF DIANHYDRIDES<br/>[FR] PROCÉDÉS DE FABRICATION DE DIANHYDRIDES
申请人:CHAULAGAIN MANI
公开号:WO2021252169A1
公开(公告)日:2021-12-16
A method of making dianhydride includes contacting a N-Substituted diimide with a carboxylic acid and substituted or unsubstituted dimethyl sulfoxide in an aqueous medium to provide a reaction mixture including tetra acid, triacid, imide diacid and diimide along with substituted or unsubstituted acetic acid, dimethyl sulfoxide and their derivatives. The method includes the isolation of tetra acid by precipitation in water followed by centrifuge or filtration. The tetra acid is converted into the corresponding dianhydride. The dianhydride prepared by the method are also described as precursor to make polyetherimide.