FIELD: chemistry.
SUBSTANCE: present invention relates to a method of producing optically transparent copolyimides of general formula:
where A = 
, 
, 
, Alyc = 
, 
, 
, Aryl = 
, 
, m = 20-80, n = 80-20, by high-temperature polycyclisation of an alicyclic diamine, an aromatic diamine and a dianhydride in a mixture of solvents containing sulpholane, at which reaction mass is heated for 1 hour and held at final temperature, according to the invention, the alicyclic diamine, the aromatic diamine and the dianhydride are taken in molar ratios of 0.2-0.8:0.8-0.2:1, respectively, reaction mass is heated from 20 to 140 °C at rate of 2 degrees per minute in a mixture of solvents containing 80 vol.% sulpholane and 20 vol.% toluene, and held at 140 °C for 7-23 hours with azeotropic distillation of water.
EFFECT: shorter reaction time and temperature, higher values of reduced viscosity of copolyimides.
1 cl, 1 tbl, 6 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING OPTICALLY TRANSPARENT COPOLYIMIDES | 2023 |
|
RU2824070C1 |
| METHOD OF PRODUCING OPTICALLY TRANSPARENT POLYIMIDES | 2023 |
|
RU2826011C1 |
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|
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|
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|
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| POLYIMIDES AND COPOLYIMIDES AS DIELECTRIC MATERIALS | 2020 |
|
RU2751883C1 |
| OPTICALLY TRANSPARENT ADAMANTANE-CONTAINING POLYIMIDES AND COPOLYIMIDES BASED ON 5.5'-(1,1,1,3,3,3-HEXAFLUOROPROPANE-2,2-DIYL)BIS(2-BENZOFURAN-1,3-DIONE) HAVING LOW DIELECTRIC CONSTANT | 2020 |
|
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| POLYIMIDES AND COPOLYIMIDES FOR PRODUCING HYDROLYTICALLY AND THERMALLY STABLE POLYIMIDE MATERIALS | 2009 |
|
RU2409599C1 |
| POLYIMIDE AND COPOLYIMIDES INTENDED FOR PRODUCTION OF POLYIMIDE MATERIALS HAVING IMPROVED HYDROLYTIC RESISTANCE | 1994 |
|
RU2072370C1 |
| METHOD OF PRODUCING ELECTRORHEOLOGICAL SUSPENSIONS | 2012 |
|
RU2499030C1 |
