New Process for Producing Polycarbonate Without Phosgene and Methylene Chloride

Komiya, Kyosuke; Fukuoka, Shinsuke; Aminaka, Muneaki; Hasegawa, Kazumi; Hachiya, Hiroshi; Okamoto, Hiroshige; Watanabe, Teiji; Yoneda, Hayami; Fukawa, Isaburo; Dozono, Tetsuro

doi:10.1021/bk-1996-0626.ch002

Cited by 31 publications

(33 citation statements)

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“…Moreover, the thus produced PC can be used as a prepolymer in solid-state polymerizations to obtain the desired high molecular weight PC. [13,14] To further improve the molecular weight, more detailed optimization studies are in progress.…”

Section: Resultsmentioning

confidence: 99%

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Direct Synthesis of Polycarbonate from Carbon Monoxide and Bisphenol A Using Efficient Pd Complex Catalyst Systems

Ishii¹,

Goyal²,

Ueda³

et al. 2001

Macromol. Rapid Commun.

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A direct oxidative carbonylation procedure of Bisphenol A to polycarbonate catalyzed with efficient Pd complex systems has been developed. Pd/2,2′‐bipyridyl complexes possessing 6,6′‐dimethyl substituents, Pd/2,2′‐biquinoline complexes, and dinuclear Pd complexes bridged with a pyridylphosphine ligand were found to give higher molecular weights and yields than conventional Pd catalyst systems. Highest molecular weight (M̄n = 5 600, M̄w = 12 900) and yield (86%) were obtained using the Pd/6,6′‐dimethyl‐2,2′‐bipyridyl complex system.

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Section: Resultsmentioning

confidence: 99%

“…13 C NMR spectra of the polymer obtained using 1a and PdBr 2 . matic C in ortho-position of 1O(C=O)O1),…”

mentioning

confidence: 99%

Direct Synthesis of Polycarbonate from Carbon Monoxide and Bisphenol A Using Efficient Pd Complex Catalyst Systems

Ishii¹,

Goyal²,

Ueda³

et al. 2001

Macromol. Rapid Commun.

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“…33 Different from amorphous polymer such as PC, crystalline polymers such as PET and Nylon are known that the solid-state polymerization of the pellets having sufficient molecular weight for general purpose is carried out to obtain higher molecular weight polymer for special use such as tire cord. 34 However, none of trials to produce PC resins by solid-state polymerization appeared prior to our disclosure.…”

Section: Solid-state Polymerization Processmentioning

confidence: 99%

Green and Sustainable Chemistry in Practice: Development and Industrialization of a Novel Process for Polycarbonate Production from CO2 without Using Phosgene

Fukuoka

Tojo

Hachiya

et al. 2007

Polym J

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125

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“…The green technologies in order to replace the traditional polluting mineral acid catalysts with solid ones are continuously improved [1][2][3][4][5][6]. Zeolites, acid treated clays, ion exchange resins and supported acids are investigated by several researchers for their application in pharmaceutical, perfumery, agro-chemicals, dye-stuffs, intermediates and specialty chemical industries [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Acid catalyzed alkylation of phenols with cyclohexene: Comparison between homogeneous and heterogeneous catalysis, influence of cyclohexyl phenyl ether equilibrium and of the substituent on reaction rate and selectivity

Ronchin

Vavasori

Toniolo

2012

Journal of Molecular Catalysis A: Chemical

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a b s t r a c tThe reactivity of several phenols toward liquid phase alkylation with cyclohexene in the presence of heterogeneous and homogeneous acid catalyst at 358 K is studied. The comparison between Amberlyst 15 and CH 3 SO 3 H, as examples of heterogeneous and homogeneous systems, shows a higher activity of the former with different behavior of selectivity between the two systems, anyway, in both systems O-alkylation and ring alkylations occur. A remarkable difference in the selectivity of the ring alkylation between heterogeneous and homogeneous systems is observed: Amberlyst 15 shows a constant ortho/para ratio close to 2, while in the presence of CH 3 SO 3 H ortho/para is variable from 3 to 5, suggesting an involvement of the cyclohexyl phenyl ether rearrangement. This is proved also by a direct relationship between the ortho/para ratio and the concentration of the cyclohexyl phenyl ether when CH 3 SO 3 H is used as a catalyst. The formation of cyclohexyl aryl ethers is reversible; on the contrary, ring alkylation appears irreversible. The reactivity of the dimethylphenols shows a strong influence of the steric hindrance of the substituent on the electrophilic attack of the cyclohexyl cation, which is poorly influenced by the inductive effect of the methyl group.

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New Process for Producing Polycarbonate Without Phosgene and Methylene Chloride

Cited by 31 publications

References 0 publications

Direct Synthesis of Polycarbonate from Carbon Monoxide and Bisphenol A Using Efficient Pd Complex Catalyst Systems

Direct Synthesis of Polycarbonate from Carbon Monoxide and Bisphenol A Using Efficient Pd Complex Catalyst Systems

Green and Sustainable Chemistry in Practice: Development and Industrialization of a Novel Process for Polycarbonate Production from CO2 without Using Phosgene

Acid catalyzed alkylation of phenols with cyclohexene: Comparison between homogeneous and heterogeneous catalysis, influence of cyclohexyl phenyl ether equilibrium and of the substituent on reaction rate and selectivity

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