Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1997-12-18
1999-05-18
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528 10, 528480, 528488, 528493, 528494, 528495, 528496, 528499, 528502, C08F6/00
Patent
active
059051396
ABSTRACT:
A polysilane containing insoluble matter and microgel as impurities is purified by dissolving the polysilane in a good solvent to form a polysilane solution, adding a poor solvent to the polysilane solution for causing a minor amount of high molecular weight component to precipitate, thereby agglomerating the insoluble matter and microgel, and removing the resulting agglomerate by filtration. The purifying method of the invention can readily remove the insolubles from the starting polysilane within a short time. A pure polysilane which can form a transparent smooth film is obtainable with commercial advantages.
REFERENCES:
patent: 4987202 (1991-01-01), Zeigler
patent: 5599892 (1997-02-01), Hayashida
patent: 5641849 (1997-06-01), Nishida et al.
Mori Shigeru
Noda Kazumi
Tabei Eiichi
Acquah Samuel A.
Shin-Etsu Chemical Co. , Ltd.
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