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Providing thermoplastic composition of luster less surface

A composition, thermoplastic molding technology, applied in the field of thermoplastic compositions, which can solve the problems of decreased weld line strength, decreased mechanical property level, insufficient weather resistance and light stability, etc.

Inactive Publication Date: 2007-05-16
LANXESS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] Removing gloss by surface embossing is already used in practice but requires a separate step and adds cost
Also, subsequent abrasion can remove the matte side of the embossing and cause gloss reappearance
The addition of finely divided fillers, such as silica, silicates or aluminates or other similar inert minerals, has been shown to reduce the gloss of thermoplastic molding compositions, however this is often accompanied by at least some molded articles An undesired reduction in the level of physical and / or mechanical properties, most notably impact strength
In addition to detrimental effects on impact strength, there is often a corresponding drop in heat deflection temperature, reduced weld line strength, insufficient weather resistance and light stability, and a reduction in other important properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] Compositions to demonstrate the invention were prepared and their properties determined. The terms used in the following description are defined as follows:

[0078] Melt temperature - the surface temperature of the extruded sheet is measured directly (with an IR-meter) as it emerges from the die.

[0079] Extrusion pressure - in-line pressure measurement near the end of the extruder barrel;

[0080] MFI—melt flow index, expressed in grams / 10 minutes, measured according to ASTM D 1238, with a load of 10kg at 230°C;

[0081] Viscosity - A Kayeness capillary rheometer was used to evaluate viscosity, measured at 100 l / s at 220°C according to ASTM D3835;

[0082] Gloss (85°) of the extruded sheets was measured at room temperature with a Gardner gloss meter according to the procedure set forth in ASTM D523, both perpendicular and parallel to the flow direction.

[0083] In carrying out the following examples, the compositions contained, in addition to the components describ...

Embodiment 2

[0110] In another set of examples, the compositions described below were prepared and their properties determined.

[0111] Table 4

[0112] 6(C)

7

resinous component

R-2

R-3

Maleic anhydride compound, pphr

5

5

Amine compounds, pphr

4

4

Melting temperature of extrusion, 

432

427

Extrusion pressure (Psi)

2855

2395

[0113] MFI

0.4

5.1

Viscosity (Pa·s)

2351

1711

glossy, vertical

43

39

glossy, parallel

48

37

[0114] (C)-representative comparative example

[0115] In the context of the resinous component called R-3, the results relate to the efficacy of the delustering agent, and in R-2 the results relate to its lower efficiency.

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PUM

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Abstract

A low gloss thermoplastic composition suitable for making article having low gloss and a process for its preparation are disclosed. The composition contains (I) a resinous component that includes (a) a (co)polyalkyl (meth)acrylate rubber characterized that it contains no grafted phase, (b) a poly(vinyl aromatic-co-nitrile)-grafted (co)polyalkyl (meth)acrylate rubber, and (c) a poly(vinylaromatic-co-nitrile), and (II)a gloss-reducing agent that is the reaction product of (d) a compound having two or more maleic anhydride groups per molecule, and (e) a compound having two or more terminal primary amine groups per molecule, with the proviso that the total of the maleic anhydride groups per molecule and the terminal primary amine functional groups per molecule is greater than 4. The incorporation of the gloss reducing agent in the inventive composition may be by blending the reaction product or, in the alternative, by blending the reactants (d) and (e) in the molten resinous component under process conditions designed to bring about the in situ formation of the inventive gloss reducing agent.

Description

technical field [0001] The present invention relates to a thermoplastic composition comprising a grafted acrylate rubber, and more particularly the present invention relates to compositions suitable for use in the manufacture of molded articles having a matte surface. Contents of the invention [0002] Low gloss thermoplastic compositions suitable for making low gloss articles and methods for their preparation are disclosed. The composition comprises a resinous component comprising (a) a (co)polyalkyl(meth)acrylate rubber characterized in that it does not contain a grafted phase, (b) a poly(vinylaromatic-copolymer - nitrile) grafted (co)polyalkyl(meth)acrylate rubber, and (c) poly(vinylaromatic-co-nitrile), and a delustering agent which is (d) per molecule with Reaction products of compounds having two or more maleic anhydride groups with (e) compounds having two or more primary amine end groups per molecule, provided that the maleic anhydride groups per molecule The sum o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/10C08L33/06C08K5/20C08K5/3415C08L25/12C08L33/04C08L51/00
CPCC08K5/20C08L25/12C08L51/003C08L33/04C08L2666/04
Inventor 张墨京张颖慎
Owner LANXESS INC