# US 10,119,009 B2 · Flowability of polycarbonate compositions

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- Number: US 10,119,009 B2
- Document ID: US10119009B2
- Status: Granted
- Kind: B2
- Application number: 15/532,207
- Filed: 2015-11-26
- Published: 2017-12-21
- Granted: 2018-11-06
- Earliest claimed: 2014-12-01
- Assignees: Covestro Deutschland AG
- Applicants: Covestro Deutschland AG
- Inventors: Rolf Wehrmann; Helmut Werner Heuer; Anke Boumans
- Web page: https://patentgrep.com/patent/US10119009B2

## CPC

- C08K 5/103: with polyalcohols
- C08K 5/521: Esters of phosphoric acids, e.g. of H3PO4
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention relates to the use of diglycerol esters for enhancing the flowability of transparent polycarbonate compositions. Melt viscosities and melt volume flow rates are improved. In addition, the diglycerol esters also exert a positive effect on the optical properties by increasing the transmission of the compositions and reducing the yellowness index.

## Claims

### Claim 1

A method comprising enhancing the flowability of a transparent polycarbonate composition comprising utilizing at least one diglycerol ester in combination with at least one phosphate, wherein the transparent polycarbonate composition exhibits a transmission, determined to ISO 13468 for a thickness of 4 mm, of at least 88% in the range from 400 nm to 800 nm.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the diglycerol ester is an ester of formula (I)
where R═COCnH2n+1 and/or R═COR′,
wherein n is an integer and R′ is a branched alkyl radical or a branched or unbranched alkenyl radical and CnH2n+1 is an aliphatic, saturated linear alkyl radical.

### Claim 3 (depends on 2)

The method according to claim 2, wherein R═COCnH2n+1, wherein n is an integer of 6-24.

### Claim 4 (depends on 1)

The method according to claim 1, wherein after addition of the diglycerol ester and the phosphate the polycarbonate composition comprises
A) 20.0 wt % to 99.0 wt % of aromatic polycarbonate,
B) 0.01 wt % to 3.0 wt % of diglycerol ester and
C) 0.0 wt % to 1.0 wt % of heat stabilizer.

### Claim 5 (depends on 1)

The method according to claim 1, wherein after addition of the diglycerol ester and the phosphate the polycarbonate composition comprises the constituents:
A) 20.0 wt % to 99.0 wt % of aromatic polycarbonate,
B) 0.01 wt % to 3.0 wt % of diglycerol ester and
C) optionally up to 1.0 wt % of heat stabilizer and
D) optionally up to 10.0 wt % of one or more further additives from the group of antioxidants, UV absorbers, IR absorbers, antistatics, optical brighteners, light-scattering agents, colorants from the group of organic pigments, inorganic pigments, carbon black and/or dyes and the inorganic fillers titanium dioxide, barium sulphate and/or additives for laser marking and
D-2) 0.001 to 0.1 wt % of phosphate,
wherein the components A) to E), including D-2), sum to 100 wt %.

### Claim 6 (depends on 4)

The method according to claim 4, wherein the amount of the diglycerol ester is from 0.2 to 1.0 wt %.

### Claim 7 (depends on 4)

The method according to claim 4, wherein the amount of the diglycerol ester is from 0.3 to 0.6 wt %.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the melt viscosity of the polycarbonate compositions determined to ISO 11443 is reduced by the diglycerol ester.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the at least one phosphate is triisooctyl phosphate.