AROMATIC POLYCARBODIIMIDE AND ITS MONOMER

Japanese Patent JP3914294

B2

PROBLEM TO BE SOLVED: To obtain an aromatic polycarodiimide that has high heat resistance and high moisture resistance, and can be used as a heat resistant coating material for soldering processes in production of electronic parts by polymerizing a specific aromatic diisocyanate as a monomer.
SOLUTION: This aromatic polycarbodiimide, having its structural unit of the formula [(n) is an integer of 2-400; X is H or fluorine), is obtained by polymerizing a 2,2'-dimethyl or 2,2'-bis(trifluoromethyl)-4,4'-diisocyanate biphenyl as the monomer in the presence of a phosphorus-based catalyst by a well known method. Although this monomer is a new compound, application of this monomer can provide films, moldings and adhesives which have excellent characteristics, such as high dimensional stability.

WO/2019/115213	A PLANT AND METHOD FOR PURIFYING AN ISOMERIC MONOMER, SUCH AS 4,4'-METHYLENE DIPHENYL DIISOCYANATE, FROM A CRUDE MIXTURE
JP5827469	How to fractionate a polyisocyanate mixture
JP6728054	Isocyanate production method

Toru Sakamoto
Shu Mochizuki
Michiharu Yamamoto

JP9485997A

May 16, 2007

March 28, 1997

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NITTO DENKO CORPORATION

C07C265/14; C08G18/02; (IPC1-7): C08G18/02; C07C265/14

JP10251511A

牧保夫、犬飼鑑,トリフルオロメチル置換ビフェニルおよびジフェニルエーテルのジイソシアネート類の合成,日本化学会誌,1972年,Vol.3,pp.675-677
Werner Mormann, Martin Brahm and Saria Benadda,Liquid Crystalline Diaromatic Diisocyanates a Route to Liquid Crystalline Polyurethanes?,Integration of Fundamental Polymer Science and Technology,1991年,Vol.5,pp.219-224

Hiroshi Morioka

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