(10)  Patent No.:  US 6,946,538 B2  (45)  Date of Patent:  Sep.20,2005  (12)  United States Patent  Bernard et al.  (54)  CATALYST FOR ISOCYANATE  CONDENSATION, COMPOSITION  CONTAINING SAME, METHOD FOR USE,  AND RESULTING COMPOSITIONS  (75)  Inventors:  Jean-Marie Bernard,  Mornant (FR);  Damien Bonneau,  Saint Clement (FR);  Marc Visseau,  Talant (FR)  (73)  Assignee:  Rhodia Chimie,  Boulogne-Billancourt  Cedex (FR)  ( *)  Notice:  Subject to any disclaimer, the term of this  patent is extended or adjusted under 35  U.S.C. 154(b) by  O  days.  (21)  Appl. No.:  10/450,261  (22)  PCT Filed:  Dec.28,2001  (86)  PCT No.:  §  371 (c)(l),  PCT/FR0l/04228  (2), ( 4) Date:  Jun. 12, 2003  (87)  PCT Pub. No.:  WO02/053614  PCT Pub. Date:  Jul. 11, 2002  (65)  Prior Publication Data  US 2004/0024212 Al Feb. 5, 2004  (30)  Foreign Application Priority Data  Dec. 29, 2000  Dec. 29, 2000  Dec. 29, 2000  Dec. 21, 2001  (FR) ............................................ 00 17317  (FR) ............................................ 00 17323  (FR) ............................................ 00 17315  (FR) ............................................ 01 16723  (51)  Int. Cl.7  ................................................  C08G 18/79  (52)  U.S. Cl.  ........................  528/73;  252/182.2; 528/45;  544/222  (58)  Field of Search  ......................... 252/182.2; 528/45,  528/73; 544/222  (56)  References Cited  U.S. PATENT DOCUMENTS  4,675,401 A  6/1987 Robin  4,801,663 A  *  1/1989 Ueyanagi et al. ........... 525/528  5,017,695 A  5/1991 Gradeff et al.  *  cited by examiner  Primary Examiner-Rachel  Gorr  (74)  Attorney, Agent, or Firm-Burns,  Doane, Swecker &  Mathis, LLP  (57)  ABSTRACT  The invention concerns a method for catalytic ( cyclo)  condensation of monomer isocyanates, characterised in that  it comprises: a) reacting starting monomer isocyanates with  a catalyst comprising a mineral or organic salt of a com› pound of formula (I), wherein  y- is  selected among: a  negatively charged oxygen atom, and a carbonaceous radical  comprising a negative charge borne by an atom of column  VB  of the periodic table or by an oxygen atom advanta› geously by a nitrogen atom and whereof the bond with the  silicon of formula (I) is borne by an atom of column  VB  of  the periodic table, advantageously by a nitrogen atom;  wherein  R$_{1}$ ,  R$_{2 }$ and  R$_{3}$ ,  identical or different, represent a  monovalent hydrocarbon radical having advantageously 1 to  30 carbon atoms, or a precursor of said compound, at a  temperature of at least 20°  C. and advantageously of at least  40°  C. and not more than 200°  C., advantageously not more  than 150°  C.; b) stopping the ( cyclo )condensation reaction at  the desired transformation rate; and c) optionally eliminating  unreacted monomers or the reaction with other reactive  compounds with the isocyanate function.  40 Claims, No Drawings  (I)  4,003,859 A  1/1977 Reymore et al.  US006946538B2 