Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-12-27
1990-04-03
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528 52, 528 67, C08G 1882
Patent
active
049141635
ABSTRACT:
According to the present invention, heterocyclic copolymers comprising recurring units [A] and [B] having specific structures are obtained by hydrolyzing reaction products of diisocyanate compounds having specific structures with tolidine diisocyanate and hydrogen cyanide.
The heterocyclic copolymers thus obtained are excellent in mechanical strength, heat resistance and solvent resistance.
REFERENCES:
patent: 3661859 (1972-05-01), Patton
Imai Chihiro
Masuda Takayuki
Minoshima Wataru
Nakagawa Yoshio
Nakahama Tetsuro
Nitto Chemical Industry Co. Ltd.
Tonen Sekiyu Kagaku Kabushiki Kaisha
Welsh Maurice J.
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