Organopolysiloxane/polyurea/polyurethane block copolymers

1. Process for preparing organopolysiloxane/polyurea/polyurethane block copolymers of the formula (1):

comprising polymerizing in a single stage reaction, at least one compound containing an aminosilane structure of the formula (2):

with an organosilicon compound of the formula (3)

(HO)(R 2 SiO) n-1 H  (3)

and at least one diisocyanate of the formula (4)

OCN—Y—NCO  (4),

and optionally one or more chain extenders having isocyanate-blocked hydroxyl groups, amine groups, or hydroxyl groups attached to an alkylene residue D

where

R is a monovalent C 1-20 hydrocarbon radical optionally substituted by one or more of fluorine or chlorine,

X is a C 1-20 alkylene radical in which nonadjacent methylene units are optionally replaced by —O—, or is a C 6-22 arylene radical,

A is an oxygen atom or an amino group —NR′—,

Z is an oxygen atom or an amino group —NR′—,

R′ is hydrogen, a C 1-10 alkyl radical, or a C 6-22 aryl radical,

Y is a divalent C 1-20 hydrocarbon radical optionally substituted by one or more of fluorine or chlorine,

W is hydrogen, a substituted hydrocarbon radical, or a radical R 2 Si—X—NH 2 ,

D is a C 1-700 alkylene radical optionally substituted by one or more of fluorine, chlorine, C 1 –C 6 -alkyl or C 1 –C 6 -alkyl ester in which nonadjacent methylene units of said alkylene radical are optionally replaced by —O—, —COO—, —OCO—, or —OCOO— groups, or is a C 6-22 arylene radical,

B, B′ are, independently, reactive or nonreactive end groups attached covalently to the copolymer,

n is a number from 1 to 4000,

m is a number form 1 to 4000,

a is a number which is at least 1,

b is a number from 0 to 40,

c is a number from 0 to 30, and

d is a number greater than 0.

2. The process of claim 1 , wherein the silanes of the formula (2), the starting materials containing silanol groups, and the polyisocyanate(s) are used in equimolar proportions.

3. The process of claim 1 , wherein the silanes of the formula (2) are linear or cyclic compounds, low molecular weight or polymeric compounds, alkoxysilanes or silazanes.

4. The process of claim 1 , wherein the silanes of the formula (2) are selected from the group consisting of:

H 3 C—O—Si(CH 3 ) 2 —CH 2 —NH 2 , H 3 C—H 2 C—O—Si(CH 3 ) 2 —CH 2 —NH 2 H 3 C—O—Si(CH 3 ) 2 —CH 2 —NH(C 6 H 11 ), H 3 C—H 2 C—O—Si(CH 3 ) 2 —CH 2 —NH(C 6 H 11 ), H 3 C—O—Si(CH 3 ) 2 —(CH 2 ) 3 —NH 2 , H 3 C—H 2 C—O—Si(CH 3 ) 2 —(CH 2 ) 3 —NH 2 , H 3 C—O—Si(CH 3 ) 2 —(CH 2 ) 3 —NH(C 6 H 11 ), H 3 C—H 2 C—O—Si(CH 3 ) 2 —(CH 2 ) 3 —NH(C 6 H 11 ),

5. The process of claim 1 , wherein, if b is at least 1, in a second step up to 95 percent by weight, based on all of the components employed, of chain extenders selected from the group consisting of diamines, isocyanate-blocked hydroxy compounds, dihydroxy compounds or mixtures thereof are additionally employed.

6. The process of claim 5 , wherein at least one chain extender has the formula (6)

HZ-D-ZH

where

D is a C 1-700 alkylene radical optionally substituted by fluorine, chlorine, C 1 –C 6 alkyl or C 1 –C 6 alkyl ester, in which nonadjacent methylene units are optionally replaced by —O—, —COO—, —OCO—, or —OCOO— groups, and

Z is an oxygen atom or an amino group —NR′—.

7. The process of claim 1 , which is carried out with exclusion of moisture and under an inert gas selected from the group consisting of nitrogen, argon, and mixtures thereof.

8. The process of claim 1 , wherein at least one catalyst selected from the group consisting of dialkyl tin compounds and tertiary amines is added.

9. The process of claim 8 , wherein at least one catalyst selected from the group consisting of dibutyl tin dilaurate, dibutyl tin diacetate, N,N-dimethylcyclohexanamine, 2-dimethylaminoethanol, and 4-dimethylaminopyridine is added.

10. The process of claim 1 which is a concerted process wherein at least a portion of each of aminosilane (2), organosilicon compound (3), diisocyanate (4), and optionally chain extender, are simultaneously present, and react to form copolymer (1).

11. The process of claim 10 , wherein aminosilane (2), organosilicon compound (3), and diisocyanate (4) are metered into an extruder, react therein, and copolymer (1) is extruded from said extruder.