- Method of preparing powdery diacetal clarifying agent
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Provided is a method of preparing a powdery diacetal clarifying agent, which comprises mixing an aromatic aldehyde, a polyol, and an acid catalyst in an organic polar solvent, adding a hydrogenating agent and an inorganic silicon-containing agent into the foregoing mixture, and filtering the mixture. The powdery diacetal clarifying agent prepared by the method can have excellent flowability, dispersability, thermal resistance, and color stability. Accordingly, the powdery diacetal clarifying agent does not release stinking odor and incur yellowing at high temperature, allowing the plastic articles to have improved appearance and visual appeal.
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Page/Page column 15-17
(2019/07/17)
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- Method of preparing diacetal-based clarifying agent
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Provided is a method of preparing a diacetal-based clarifying agent, comprising mixing aromatic aldehyde and polyol in the presence of an acid catalyst to undergo a condensation reaction, and adding a safe hydrogenating agent with the mixture. After filtering, drying and grinding steps, a diacetal-based clarifying agent with high purity is obtained by the method. When applying the diacetal-based clarifying agent to the plastic process, the final plastic product not only eliminates the release of stinking odor, but also improves the color stability at high temperature, such that the application of the final plastic product can be improved.
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Paragraph 0060-0062
(2015/11/24)
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- Process For Preparation Of Acetals
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A process for the preparation of 1,3:2,4-bis (4-methylbenzylidene) sorbitol (MDBS) and 1,3:2,4-bis (3,4-dimethylbenzylidene) sorbitol (DMDBS) via a dehydrocondensation reaction is disclosed. The reaction is carried out between an aldehyde and an alditol in a mole ratio of 2:1 wherein ionic fluid is used as the acidic catalyst and/or reaction medium. The ionic fluid used in accordance with the present invention is quaternary ammonium salt based ionic liquid.
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Paragraph 0095
(2013/11/19)
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- Process For The Preparation of Alditol Acetals
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The present invention is directed to a process for the preparation of 1,3:2,4-bis (4-methylbenzylidene) sorbitol (MDBS) and 1,3:2,4-bis (4-dimethylbenzylidene) sorbitol (DMDBS) by dehydrocondensating an aldehyde and an alditol using a hydrophobic ionic liquid as an acid catalyst. The ionic liquid used in the accordance with the process of the present invention is a phosphonium ion based ionic liquid.
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Paragraph 0060
(2013/11/19)
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- PROCESS FOR PREPARATION OF ACETALS
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A process for the preparation of 1,3:2,4-bis(4-methylbenzylidene) sorbitol (MDBS) and 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol (DMDBS) via a dehydrocondensation reaction is disclosed. The reaction is carried out between an aldehyde and an alditol in a mole ratio of 2:1 wherein ionic liquid is used as the acidic catalyst and/or reaction medium. The ionic liquid used in the process is quaternary ammonium salt based ionic liquid.
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Page/Page column 19
(2012/07/28)
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- PROCESS FOR PREPARING ALDITOL ACETALS
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A process for preparing alditol acetals via a dehydrocondensation reaction is disclosed. The reaction is carried out by adding an aldehyde and an alditol using a metal salt based ionic liquid as an acid catalyst. The ionic liquid used in the process is prepared by dissolving a hydrogen donor and a compound providing counter ion in a solvent.
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Page/Page column 13-14
(2012/07/28)
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- Method for preparing acetal-containing compositions
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An acetal compound may be formed by the method of reacting a substitiuted or unsubstituted benzaldehyde, a polyhydric alcohol, and an at least one acid catalyst at ambient temperatures, in a homogenous reaction media in the presence of at least one water miscible organic solvent. The molar ratio of the acid catalyst to the benzaldehyde may be less than about 0.6 to 1, respectively, of acid catalyst to benzaldehyde.
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Page/Page column 4
(2008/06/13)
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