Deep black thermoplastic molding compositions having high gloss and production thereof

Patent metadata

Field	Value
Publication number	US-10329401-B2
Application number	US-201415021412-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Sep 16, 2013
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

Deep black thermoplastic molding compositions having high gloss can be produced by mixing the following components: 90% to 99.5% by weight of one or more styrene copolymers as component A1, or 90% to 99.5% by weight of one or more polymethylmethacrylates (PMMA) and/or polyalkylmethacrylates as component A2, or 90% to 99.5% by weight of one or more polycarbonates (PC) and/or polyester carbonates as component A3, 0.01% to 5% by weight of a pigment black as component B, 0.1% to 1.5% by weight of at least two dyes soluble in the molding composition as component C, 0% to 5% by weight of one or more additives other than components B and C, as component D. These are found to be particularly weathering-resistant.

First claim

What is claimed is:

1. A black thermoplastic molding composition with high gloss, consisting of:
A) from 90 to 99.5% by weight of one or more styrene copolymers as component A1,
B) from 0.01 to 5% by weight of a carbon black pigment as component B,
C) as component C, from 0.5 to 1.2% by weight of at least three dyes soluble in the molding composition,
D) as component D, from 0 to 5% by weight of one or more additional substances different from components B and C,
where component A is a copolymer selected from the group consisting of acrylonitrile, styrene, and/or α-methylstyrene, phenylmaleimide, maleic anhydride, methyl methacrylate, and a mixture of these,
where the ratio by weight of component B used to component C used is from 3:1 to 1:15,
where the at least three dyes cover complementary color regions such that the combination produces a black color,
where the thermoplastic molding compositions have a deep-black color with L*-values from 0.5 to 2.0, measured in accordance with DIN 5033:2009, and a high gloss of more than 98, measured in accordance with DIN 67530:1982, and
where each of the percentages by weight is based on the total weight of components A to D, and these give a total of 100 percent by weight.

2. The thermoplastic molding composition as claimed in claim 1 , characterized in that the molding composition consists of, as component B, from 0.01 to 5% by weight of a carbon black pigment which has an average primary particle size in the range from 5 to 100 nm.

3. The thermoplastic molding composition as claimed in claim 1 , characterized in that component A is a copolymer of acrylonitrile, styrene, and/or α-methylstyrene, and the proportion by weight of acrylonitrile, based on component A, is from 19 to 39% by weight.

4. The thermoplastic molding composition as claimed in claim 1 , characterized in that component A is a styrene/acrylonitrile copolymer or an α-methylstyrene/acrylonitrile copolymer.

5. The thermoplastic molding composition as claimed in claim 1 , characterized in that component A is a transparent styrene/acrylonitrile copolymer or a transparent α-methylstyrene/acrylonitrile copolymer with a melt volume rate, MVR, 220/3.8, of from 4 to 22 cm 3 /10 min.

6. The thermoplastic molding composition as claimed in claim 1 , characterized in that component A is a styrene/methyl methacrylate copolymer, where the proportion by weight of MMA, based on component A, is from 19 to 31% by weight.

7. The thermoplastic molding composition as claimed in claim 1 , characterized in that the proportion by weight of B is from 0.05 to 3% by weight.

8. A method of producing a molded object with a deep-black surface and high gloss comprising the step of molding the thermoplastic molding compositions as claimed in claim 1 wherein the molded object is an object for use in a motor vehicle, a household appliance, electrical equipment, a decorative strips, or outdoor cladding.

9. A method as claimed in claim 8 wherein the molded object is an object for use in the exterior region of a motor vehicle selected from A-, B-, C-, or D-pillar cladding, a spoiler, a window frame, a cover strip, a hood, a panel, a part of a radiator grille, antenna cladding, of the side mirror, or a part of a front or rear lamp.

10. A process as claimed in claim 1 , characterized in that components A, B, and C, and also optionally D, are mixed with one another.

11. The thermoplastic molding composition as claimed in claim 2 , characterized in that the molding composition consists of, as component B, from 0.01 to 5% by weight of a carbon black pigment which has an average primary particle size in the range from 7 to 60 nm.

Assignees

• Ineos Styrolution Group Gmbh

Inventors

• Boeckmann Philipp
• Mosbach Norbert
• Jahnke Eike

Classifications

• C08L25/04

  Homopolymers or copolymers of styrene · CPC title

• C08L33/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08J5/00

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title

• C08L33/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08K3/04 Primary

  Carbon · CPC title