Polysiloxane-polycarbonate block cocondensates

Patent metadata

Field	Value
Publication number	US-9845379-B2
Application number	US-201415027761-A
Country	US
Kind code	B2
Filing date	Oct 6, 2014
Priority date	Oct 8, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

The present invention relates to polysiloxane-polycarbonate block cocondensates comprising particular rearrangement structures and having improved rheological properties and melt stability as well as to mouldings and extrudates made from these polysiloxane-polycarbonate block cocondensates.

First claim

The invention claimed is:

1. A polysiloxane-polycarbonate block cocondensate derived from
(A) at least one hydroxyaryl-terminated siloxane of the formula (1) (siloxane component)

 in which
R 1 is H, Cl, Br or C 1 to C 4 -alkyl,
R 2 and R 3 are the same or different and each independently from one another selected from aryl, C 1 to C 10 -alkyl and C 1 to C 10 -alkylaryl,
X is a single bond, —CO—, —O—, C 1 - to C 6 -alkylene, C 2 to C 5 -alkylidene, C 5 to C 12 -cycloalkylidene or C 6 to C 12 -arylene which may optionally be fused to further aromatic rings containing heteroatoms,
n is a number from 10 to 100,
m is a number from 2 to 5, and
p is 0 or 1;

(B) and at least one polycarbonate

wherein the polysiloxane-polycarbonate block cocondensate contains at least one of the following structures (I) to (IV):

 in which
the phenyl rings are unsubstituted or independently mono- or disubstituted by C 1 to C 8 -alkyl and/or halogen,
X is a single bond, C 1 to C 6 -alkylene, C 2 to C 5 -alkylidene or C 5 to C 6 -cycloalkylidene,
the linkages indicated by—in the structural units (I) to (IV) are each part of a carboxylate group;

and wherein the amount of the structural units (I) to (IV) totals 60 to 1500 ppm (determined after hydrolysis, based on the polysiloxane-polycarbonate block cocondensate), wherein the polysiloxane-polycarbonate block cocondensate has a relative solution viscosity of 1.26 to 1.40, determined in dichloromethane at a concentration of 5 g/l at 25° C. using a Ubbelohde viscosimeter.

2. The polysiloxane-polycarbonate block cocondensate according to claim 1 , wherein the amount of the structural units (I) to (IV) totals 80 to 850 ppm (based on the polysiloxane-polycarbonate block cocondensate and determined after hydrolysis).

3. The polysiloxane-polycarbonate block cocondensate according to claim 1 , wherein the polysiloxane-polycarbonate block cocondensate is derived from a composition comprising the siloxane component of the formula (1) and the polycarbonate, which composition contains the siloxane component in an amount of 2 to 20%, based on the polycarbonate.

4. The polysiloxane-polycarbonate block cocondensate according to claim 1 , which contains structures derived from a diphenol according to general formula (2b):

wherein
R6 and R7 are independently of one another H, C 1 -C 18 -alkyl-, C 1 -C 18 -alkoxy, halogen or an optionally substituted aryl- or aralkyl, and
X is a single bond, —CO—, —O—, C 1 - to C 6 -alkylene, C 2 to C 5 -alkylidene, C 5 to C 12 -cycloalkylidene or C 6 to C 12 -arylene which may optionally be fused to further aromatic rings containing heteroatoms.

5. The polysiloxane-polycarbonate block cocondensate according to claim 1 , wherein the hydroxyaryl-terminated siloxane has a weight-average molecular weight of 3000-20000 g/mol.

6. The polysiloxane-polycarbonate block cocondensate according to claim 1 , wherein R 1 is H, p is 1 and X is isopropylidene.

7. The polysiloxane-polycarbonate block cocondensate according to claim 1 , wherein R 2 and R 3 are methyl.

8. The polysiloxane-polycarbonate block cocondensate according to claim 1 which has a sodium content within the range of from 0.1 ppm to 1000 ppm.

9. A method for the production of a moulding comprising molding the polysiloxane-polycarbonate block cocondensate according to claim 1 .

10. A moulding or extrudate comprising the polysiloxane-polycarbonate block cocondensate according to claim 1 .

Assignees

• Covestro Deutschland Ag

Inventors

• Meyer Alexander
• Horn Klaus
• Pfingst Thomas
• Wetzel Sebastian

Classifications

• C08G77/448

  containing polycarbonate sequences · CPC title

• C08G64/186 Primary

  containing polysiloxane sequences · CPC title

• C08G64/20

  General preparatory processes · CPC title

• C08G77/08

  characterised by the catalysts used · CPC title