US 7,321,019 B2
Dispersions containing organopolysiloxane/polyurea copolymers
Wolfgang Ziche, Diera-Zehren (Germany)
Assigned to Wacker Chemie AG, Munich (Germany)
Filed on Dec. 08, 2004, as Appl. No. 11/7,133.
Claims priority of application No. 103 59 704 (DE), filed on Dec. 18, 2003.
Prior Publication US 2005/0137327 A1, Jun. 23, 2005
Int. Cl. C08G 77/26 (2006.01)
U.S. Cl. 528—38  [427/387; 524/837; 525/474] 5 Claims
 
1. A process for the preparation of an aqueous dispersion containing organopolysiloxane/polyurea copolymers of the formula
R3-[(A)a(B)b]-R3  (I),
in which
(A) is a radical of the formula
—[NH-Z-NH—CO—ND-Y—SiR2—(O—SiR2)r—O—SiR2—Y—ND-CO]—  (II)
and
(B) a radical of the formula
—[NH-Z-NH—CO-E-X-E-CO]—  (III)
in which
X are identical or different C1-700 alkylene radicals optionally substituted by fluorine, chlorine, C1-C6-alkyl or C1-C6-alkyl ester in which non-adjacent methylene units are optionally replaced by —O—, —COO—, —OCO— or —OCOO— groups, or are optionally substituted C6-22 arylene radicals,
Y are identical or different C1-30 hydrocarbon radicals in which non-adjacent methylene units are optionally replaced by —O— groups,
Z are identical or different divalent C1-30 hydrocarbon radicals optionally substituted by fluorine or chlorine,
D are identical or different and are hydrogen, an optionally substituted hydrocarbon radical, or an —R2Si—X—NH2 radical,
E are identical or different and are oxygen or an amino group —NR2—,
R are identical or different and are a monovalent C1-20 hydrocarbon radical optionally substituted by fluorine or chlorine, or an —OR4 radical in which R4 has the same meaning as that given for R2,
R2 are identical or different and are hydrogen or a C1-22 hydrocarbon radical,
R3 are identical or different and are an —NH-Z-NCO, an —CO-E-X-E-H or an —CO—ND-Y—SiR2—(O—SiR2)r—O—SiR2—Y—NDH radical,
r is 0 or an integer from 1 to 4000,
a is an integer greater than 1 and
b is 0 or an integer from 1 to 2000,
wherein the individual blocks (A) and (B) are optionally randomly distributed (R3-[(A)a-stat-(B)b]-R3), comprising mixing
(a) at least one amino-terminated organopolysiloxane,
(b) at least one diisocyanate,
(c) water,
(d) at least one Brönsted acid,
(e) optionally one or more surface-active agents,
(f) one or more bases,
(g) polyfunctional amines which differ from (a), and
(h) optionally one or more polyfunctional isocyanates which differ from (b), and reacting reactive species to form an organopolysiloxane/polyurea polymer.