 Process for the manufacture of surfactant cleansing blocks and compositions thereof |
| OF THE INVENTION By way of definition, the term "block" as used herein means formed, solid ... |
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| Solid alkaline detergent and process for making the same |
| Having thus disclosed the present invention, what is claimed is: 1. A process for producing a solid ... |
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| Built synthetic organic detergent composition patties and processes for washing laundry therewith |
| What is claimed is: 1. A pre-measured form-retaining built synthetic organic detergent composition ... |
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| Formation of high active detergent particles |
| What is claimed is: 1. A process for producing high active detergent particles, comprising the ... |
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| Solid cleaner |
| We claim: 1. A solid cast cleaning composition consisting essentially of: (a) an amine oxide ... |
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| Cationic compositions containing diol and/or diol alkoxylate |
| OF THE INVENTION The compounds of the aforementioned formula (1), sometimes referred to herein as ... |
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| Method and sporicidal compositions for synergistic disinfection or sterilization |
| What is claimed is: 1. A method of disinfecting and sanitizing fowl eggs comprising contacting said ... |
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| Means for killing bacterial spores with glutaraldehyde sporicidal compositions |
| 1. A process for killing bacterial spores on instruments, appliances, eating utensils, walls, ... |
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| Glutaraldehyde sterilizing compositions |
| What I claim is: 1. A method of killing dormant spores, which consists of contacting said spores ... |
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| Buffered glutaraldehyde sterilizing and disinfecting compositions |
| I claim: 1. A hard water compatible aqueous sterilizing and disinfecting solution, comprising from 0... |
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Colorless transparent polyimide shaped article and process for producing the same
| Details |
Inventors: Higashi, Kazumi; Noda, Yuzuru;
Assignee: Nitto Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Kight; John
Assistant Examiner: Moore; M. L.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
A colorless transparent polyimide shaped article having as a main component at least one recurring unit selected from the recurring units of the formulae (I) to (IX). It is useful, for example, as an oriented film in liquid crystal display devices. The polyimide shaped article is produced by a process which comprises preparing a solution of a polyamide acid having as a main component at least one recurring unit selected from the recurring units of the formulae (V) to (VIII) in an amide-type organic polar solvent, forming a shaped article of the polyamide acid from the solution, and imidizing the resulting shaped article of the polyamide acid. |
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DETAILED DESCRIPTION OF THE INVENTION The polyamide acid used in the process of this invention can be obtained, for example, by reacting a biphenyltetracarboxylic acid dianhydride represented by the following formula (X) ##STR10## with at least one diamino compound selected from the group consisting of aromatic diamino compounds represented by the following formulae (XI) to (XIV) ##STR11## In formulae (XI) to (XIV), X.
sub.
1 through X.
sub.
6 are the same as defined above for formulae (I) to (IV).
Examples of the biphenyltetracarboxylic acid dianhydride are 3,3',4,4'-biphenyltetracarboxylic dianhydride of the formula ##STR12## and 2,3,3',4'-biphenyltetracarboxylic dianhydride of the formula ##STR13## Of the aromatic diamino compounds having the amino groups at the m-position, typical examples of the aromatic binuclear diamines of the formula (XI) include ##STR14## Typical examples of the aromatic tetranuclear diamines of the formula (XII) include ##STR15## Typical examples of the aromatic mononuclear diamines of the formula (XIII) include ##STR16## Typical examples of the aromatic trinuclear diamines represented by the formula (XIV) include ##STR17## The aromatic binuclear diamine, the aromatic tetranuclear diamine, the aromatic mononuclear diamine and the aromatic trinuclear diamine may be used alone or in suitable combinations thereof.
By combining the biphenyltetracarboxylic acid dianhydride with the aromatic diamine having the amino groups at the m-position, a colorless transparent polyimide shaped article having at least one recurring unit of the formulae (I) to (IV) as a main component can be obtained for the first time.
The term "as a main component" used herein refers to include the case where the polyimide consists entirely of at least one recurring unit described above.
The colorless nature and transparency of the resulting polyimide shaped article are higher as the content of at least one recurring unit of formulae (I) to (IV) is larger.
The colorless nature and transparency required by this invention can be secured if the polyimide shaped article contains at least 70 mol % of at least one recurring unit of the formulae (I) to (IV)
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Molecular Biology 
