Plasties moulding compositions, mouldings and production processes

A technology of plastic mold and composition, applied in coating and other directions, can solve problems such as small gate, and achieve the effect of high surface quality, high transparency and excellent optical performance

Active Publication Date: 2012-07-11
ROHM G M B H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these techniques require a smaller diameter of the gate
A particular problem here is caused by the increased miniaturization of mobile device installations, which leads to very thin display covers, typically with a thickness of 0.5mm-1.2mm

Method used

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  • Plasties moulding compositions, mouldings and production processes
  • Plasties moulding compositions, mouldings and production processes
  • Plasties moulding compositions, mouldings and production processes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Comparative Example 1 was essentially repeated, except that Inventive Example 1 used a plastics molding composition prepared as follows: about 33% by weight of PMMA molding composition A) having a melt flow rate of about 21 ml / 10 minutes (may Product name POQ62 from Evonik GmbH) and approximately 67% by weight of an impact modifier that imparts high die swell to the plastic molding composition (available under the trade name zk50 from Evonik GmbH commercially) compounding (mixing in the melt).

[0113] The properties of the plastics moulding compositions were investigated using the methods described above, and the haze was also evaluated here for mouldings having a thickness of 1 mm. The data obtained are shown in Table 1.

Embodiment 2

[0123] Comparative Example 1 was essentially repeated, except that Inventive Example 2 used a plastics molding composition prepared as follows: about 50% by weight of PMMA molding composition A)( Can trade name POQ62 from Evonik GmbH) and approximately 50% by weight of an impact modifier that imparts high die swell to the plastic molding composition (available under the trade name zk50 from Evonik GmbH commercially) compounding (mixing in the melt).

[0124] The properties of the plastics moulding compositions were investigated using the methods described above, and the haze was also evaluated here for mouldings having a thickness of 1 mm. The data obtained are shown in Table 1.

[0125] Table 1

[0126]

[0127] Table 1 (continued)

[0128]

[0129] The data presented above clearly reveal that a haze of less than 1% can be obtained in samples with a thickness of 1 mm only when the composition according to the invention is used. These data can be achieved inde...

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Abstract

The present invention relates to a plastics moulding composition encompassing at least one poly(meth)acrylate A) and at least one impact-modified poly(meth)acrylate B), wherein the die swell of the plastics moulding composition is at least 15%, measured at 5 MPa and 2200C to DIN 54811 (1984), and the melt flow rate of the poly(meth)acrylate A) is at least 10 ml per 10 minutes, measured to ISO 1133 at 2300C with a load of 3.8 kg. The present invention also describes mouldings which encompass the plastics moulding composition described above, and processes for the production of the said mouldings.

Description

technical field [0001] The present invention relates to plastics molding compositions, moldings comprising said plastics molding compositions, and processes for their preparation. Background technique [0002] Poly(meth)acrylates have excellent optical properties, and these plastics are therefore widely used in applications requiring high transparency. The plastics here show a very high resistance to many chemicals and have a high resistance to weathering. However, the disadvantage is the lower impact resistance compared to other plastics. This property is therefore improved by using so-called impact modifiers to meet specific requirements. [0003] Molding compositions of this type are described, for example, in DE-A 3300526, DE-A 3329765, EP-A 0113924, EP-A 0465049, EP-A 0522351 and WO 2006 / 029704. [0004] The requirements imposed on display covers for mobile devices are particularly stringent, since they may be briefly exposed to high mechanical loads during daily use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08L51/00C08J5/18B29C45/00
CPCC08L33/12C08L51/003C08L2205/02C08L2666/04B29C45/00C08F265/06C08J5/18C08L51/00
Inventor W·赫斯K·舒尔特斯刘国民
Owner ROHM G M B H
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