Copolycarbonate compositions with cyclic and linear oligomers and improved optical properties

Patent metadata

Field	Value
Publication number	US-10323145-B2
Application number	US-201515501096-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Aug 1, 2014
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

The invention relates to copolycarbonate compositions having cyclic and linear oligomers and improved optical properties, to their use for producing blends and moldings and to moldings obtained therewith. The copolycarbonate compositions comprise (A) 5% to 99% by weight, based on the total weight of the copolycarbonate composition, of a copolycarbonate containing one or more monomer units of the formula (1)

wherein R 1 is hydrogen or C 1 -C 4 -alkyl, R 2 is C 1 -C 4 -alkyl, and n is 0, 1, 2 or 3 and (B) 95% to 1% by weight, based on the total weight of the copolycarbonate composition, of a (co)polycarbonate containing one or more monomer units of the general formula (2)

wherein R 3 is H or linear or branched C 1 -C 10 alkyl and R 4 is linear or branched C1-C10 alkyl.

First claim

The invention claimed is:

1. A copolycarbonate composition comprising:
A) 5% to 99% by weight, based on the total weight of the copolycarbonate composition, of a copolycarbonate containing one or more monomer units of the formula (1):

wherein,
R 1 is hydrogen;
R 2 is a methyl group; and
n is 3; and

B) 95% to 1% by weight, based on the total weight of the copolycarbonate composition, of a (co)polycarbonate containing one or more monomer units of the general formula (2):

wherein,
R 3 is H, linear C 1 -C 10 alkyl, or branched C 1 -C 10 alkyl; and
R 4 is linear C 1 -C 10 alkyl or branched C 1 -C 10 alkyl;

and wherein component B) does not have any monomer units of the formula (1);
wherein component B contains at least one cyclic oligomer of the general formula (I) in a total amount of 1.10% by weight to 1.50% by weight, based on the weight of component B:

wherein,
n is an integer from 2 to 6; and
Z is a radical of the formula (Ia):

wherein,
R 5 and R 6 are each independently H or C 1 -C 8 -alkyl and
X is a single bond, C 1 - to C 6 -alkylene, C 2 - to C 5 -alkylidene, or C 5 - to
C 6 -cycloalkylidene, which may be substituted by C 1 - to C 6 -alkyl;

and component B contains one or more linear oligomers of the general formulae (II), (III), (IV), (V) and/or (VI) in a total amount of 0.50% by weight to 1.40% by weight, based on the weight of component B:

wherein
k, 1, m, o and p are each independently an integer from 1 to 6; and
Z is the radical of the formula (Ia);

wherein the amounts of the structures (I) and (II) to (VI) are determined by precipitation and subsequent quantitative HPLC.

2. The copolycarbonate composition as claimed in claim 1 , wherein the one or more linear oligomers of the formulae (II) to (VI) are present in component B in an amount of 0.60% by weight to 1.35% by weight, based on the weight of component B.

3. The copolycarbonate composition as claimed in claim 1 , wherein the total amount of the cyclic oligomers of the general formula (I) and the linear oligomers of the general formulae (II), (III), (IV), (V) and (VI) in component B adds up to at least 2.0% by weight, based on the weight of component B.

4. The copolycarbonate composition as claimed in claim 1 , wherein cyclic oligomers of the formula (I) with n =4 comprise the largest proportion of the cyclic oligomers of the formula (I), based on the total amount of the cyclic oligomers of the formula (I) in component B.

5. The copolycarbonate composition as claimed in claim 1 , wherein X is a single bond or isopropylidene and R 5 and R 6 are each independently H or C 1 -C 4 -alkyl.

6. The copolycarbonate composition as claimed in claim 1 , wherein the proportion of the monomer units of the formula (1) in the copolycarbonate is 0.1-88 mol % (based on the sum total of the diphenol monomer units present therein).

7. The copolycarbonate composition as claimed in claim 1 , wherein component A additionally contains monomer units of the formula (4):

wherein
R 7 and R 8 are each independently H, C 1 -C 18 -alkyl, C 1 -C 18 -alkoxy, a halogen, substituted aryl, or aralkyl; and
Y is a single bond, —SO 2 —, —CO—, —O—, —S—, C 1 -C 6 -alkylene, C 2 -C 5 -alkylene, C 6 -C 12 -arylene, or C 6 -C 12 -arylene which is fused to further aromatic rings containing heteroatoms.

8. The copolycarbonate composition as claimed in claim 1 , wherein component A and/or component B contains, as end group, a structural unit of the formula (3a) and/or (3b):

9. The copolycarbonate composition as claimed in claim 1 , wherein component A contains monomer units derived from compounds of the general formulae (1b) and (4c):

and, in the monomer units of the general formula (2) of component B, R 3 is H and R 4 is linear C 1 -C 6 alkyl or branched C 1 -C 6 alkyl.

10. The copolycarbonate composition as claimed in claim 1 , wherein 0% to 5% by weight, based on the total weight of the copolycarbonate composition, of organic additives is present in the composition.

11. The copolycarbonate composition as claimed in claim 1 , wherein at least one additive from the group consisting of thermal stabilizers, demolding agents, and UV absorbers is present.

12. An article comprising a blend, molding, bezel, reflector, indicator, lens, screen/display cover, LED, extrudate, film, film laminate, or coextrusion layer comprising the copolycarbonate composition as claimed in claim l.

13. A molding, extrudate, film, or film laminate comprising the copolycarbonate composition as claimed in claim 1 .

14. A molding, extrudate, or film comprising coextrusion layers comprising the copolycarbonate composition as claimed in claim 1 .

Assignees

• Covestro Deutschland Ag

Inventors

• Wehrmann Rolf
• Heuer Helmut Werner
• Boumans Anke

Classifications

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title