Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2006-11-14
2006-11-14
Gorr, Rachel (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C525S452000
Reexamination Certificate
active
07135536
ABSTRACT:
The present invention relates to a polymerization method of polyisocyanates endcapped with acyl chlorides, and more particularly to a process for preparing polyisocyanate with higher stability comprising endcapping a living polymer chain amidate anion with an acyl chloride derivative in the presence of an amine catalyst, thereby enabling to maximize endcapping ratios.
REFERENCES:
Patten, Timothy E. and Novak, Bruce M.; Living Organotitanium (IV)-Catalyzed Polymerizations of Isocyanates;J. AM. Chem. Soc.1996, 118, pp. 1906-1916.
Se, Kazunori; Aoyama, Kouji; Aoyama, Jun; Donkai, Masaru; “Introduction of Azobenzenes or Vinyl Groups into Ends of Rodlike Polymers”,Macromolecules2003, 36, pp. 5878-5881.
Gu, Hong; Nakamura, Yo; Sato, Takahiro; Teramoto, Akio; Green, Mark M.; Jha, Salil K.; Andreola, Christopher; Reidy, Michael P.; “Optical Rotation of Random Copolyisocyanates of Chiral and Achiral Monomers: Sergeant and Soldier Copolymers”;Macromolecules1998, 31, pp. 6362-6368.
Ute, Koichi; Asai, Toshiya; Fukunishi, Yoichi; Hatada, Koichi, “Stabilization of Oligo(butyl isocyanate) by Acetyl End-Capping”,Polymer Journal, vol. 27, No. 4, pp. 445-448 (1995).
Jung Chan Hee
Lee Jae-Suk
Park Sang-Yoon
Samal Shashahar
Yogendra Nath Guttikonda
Frommer & Lawrence & Haug LLP
Gorr Rachel
Gwangju Institute of Science and Technology
Santucci Ronald R.
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