Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1998-05-15
2000-06-20
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528355, 528356, 528359, 528363, 528398, 528468, 525 88, 525413, 525419, 525420, C08G 6308, C08G 6382
Patent
active
060779306
ABSTRACT:
A preparation process of a polymer comprising conducting ring-opening polymerization of a 4- to 10-membered ring-opening polymerizable cyclic monomer in the presence of a phosphazenium salt of an active hydrogen compound represented by the chemical formula (1): ##STR1## wherein n is an integer of 1 to 8 and indicates the number of phosphazenium cations, Z.sup.n- is an anion of a n-valent active hydrogen compound derived by releasing n protons from an active hydrogen compound having a maximum of 8 active hydrogen atoms, a, b, c and d are individually a positive integer or 0 and are not all 0 at the same time, R's are the same or different hydrocarbons having 1 to 10 carbon atoms, and two R's located on each common nitrogen atom may be coupled together to form a ring structure; or in the presence of the phosphazenium salt of the active hydrogen compound and the active hydrogen compound is disclosed. The process can prepare polymer by ring-opening polymerization of a 4- to 10-membered ring-opening polymerizable cyclic monomer in the presence of an initiator which causes no specific problem or preparation and handling, contains quite no installic ingredient and has no residual odor.
REFERENCES:
Chem Abstract 129 : 203429 "Preparation of Siloxane compositions in the presence of phosphazene base activated with water" Remy et al.
Hayashi Takaomi
Kiyono Shinji
Nobori Tadahito
Takaki Usaji
Mitsui Chemicals Inc.
Truong Duc
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