Moisture crosslinking elastomer composition

1. A moisture-crosslinkable composition comprising

(A) 100 parts by weight of at least one silane-terminated polydiorganosiloxane-urea/urethane copolymer of the general formula 1

 in which

R is a monovalent C 1-20 hydrocarbon radical optionally substituted by fluoro or chloro,

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

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

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

Y is a C 1-20 hydrocarbon radical optionally substituted by fluoro or chloro,

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

B is a radical of the formula 2

-Z-Si(R 1 ) m (R″) 3-m   (2)

Z is a methylene radical,

R 1 is a monovalent C 1-12 hydrocarbon radical optionally substituted by fluoro or chloro,

R″ is a moisture-reactive radical selected from the group consisting of C 1 –C 4 alkoxy, C 1 –C 20 acyl, C 1 –C 6 alkylaminooxy, C 1 –C 6 alkyloximo, and mixtures thereof,

W is a radical B or hydrogen,

m is 0, 1 or 2,

n is an integer from 1 to 300,

a is an integer which is at least 1,

b is 0 or an integer from 1 to 30,

c is an integer from 1 to 30, and

d is 0 or 1, with the proviso that the composition of the units is chosen such that the copolymer possesses a melting point in the range of 30° C. to 200° C., and

(B) from 0.1 to 20 parts by weight of at least one silane of the formula 3

Ω-(CH 2 ) e —Si(R 2 ) 3-f (CH 3 ) f   (3)

where

Ω is a moiety selected from the group consisting of —NHR 3 , —NR 3 —(CH 2 ) g —NHR 3 , acryloyl, methacryloyl, OCN, —SH, glycidyloxy, and chloro,

R 3 is hydrogen or an optionally halogen-substituted C 1-18 hydrocarbon radical,

R 2 independently are methoxy or ethoxy group,

e is 1 or 3,

f is 0 or 1, and

g is from 1 to 10.

2. The moisture-crosslinkable composition of claim 1 , wherein polydiorganosiloxane blocks in copolymer (A) have a molecular weight Mw of from 500 to 30,000.

3. The moisture-crosslinkable composition of claim 1 , wherein R are methyl, phenyl, or some R are methyl and some R are phenyl.

4. The moisture-crosslinkable composition of claim 1 , wherein A is an amino group.

5. The moisture-crosslinkable composition of claim 1 , wherein R″ is a methoxy or ethoxy radical, or wherein some R″ are methoxy and some R″ are ethoxy.

6. The moisture-crosslinkable composition of claim 1 , wherein at least one Ω is a moiety selected from the group consisting of —NHR 3 , —NR 3 —(CH 2 ) g —NHR 3 , and glycidyloxy.

7. A one-component hotmelt adhesive which is moisture-crosslinking by way of silane end groups, comprising at least one moisture-crosslinkable composition of claim 1 .