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Polysiloxane-polycarbonate copolymer compositions

A technology of siloxane copolymer and polycarbonate, applied in the direction of cabinet/cabinet/drawer parts, etc., can solve the problems of large size, loss of expected performance, and reduction of impact performance

Inactive Publication Date: 2017-12-12
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, opaque polysiloxane-polycarbonate copolymers have large siloxane domain sizes, and their use may result in articles with cosmetic defects such as delamination, gate whitening, and pearlescence
Replacing opaque polysiloxane-polycarbonate copolymers with transparent polysiloxane-polycarbonate copolymers in the above articles can improve appearance properties, but also result in reduced impact performance, reduced chemical resistance, and other desirable properties. loss

Method used

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  • Polysiloxane-polycarbonate copolymer compositions
  • Polysiloxane-polycarbonate copolymer compositions
  • Polysiloxane-polycarbonate copolymer compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] Example 1. Compositions comprising polycarbonate and PC-siloxane copolymer

[0159] Varying the total amount of siloxane (wt %) from the two PC-siloxane copolymer sources, and varying the ratio of the two copolymers (compositions 1-4; Table 4), a series of polycarbonate compositions were prepared . Impact and appearance properties were evaluated. An increase in the PC-Si-1:PC-Si-2 ratio resulted in improved flow mark visibility. As the amount of PC-siloxane copolymer increases, so does the impact performance, as evidenced by the increase in NII energy. Flame retardancy was also excellent in all compositions.

[0160] Table 4.

[0161] combination

Embodiment 2

[0162] Example 2. Compositions comprising polycarbonate and impact modifier

[0163] Additional studies included comparisons of compositions with different amounts of PC-siloxane copolymer and impact modifier (Table 5). The incorporation of impact modifier IM-1 resulted in high flow mark visibility, lower ductile-brittle transition temperature and high impact energy (compositions 5 and 8). However, the type of impact modifier incorporated in compositions with lower amounts of PC-polysiloxane had an impact on impact and appearance properties, as compared to compositions with IM-2 (compositions 9 and 10) In comparison, the compositions with IM-1 (compositions 6 and 7) have improved impact and appearance properties. Furthermore, the deep black color power remained high in all compositions prepared.

[0164] table 5.

[0165]

Embodiment 3

[0166] Example 3. Compositions comprising different flame retardants

[0167] Composition 2 was modified to replace KSS with a different flame retardant. Replacing KSS with NaTs (also known as sulfonates) provided a composition with good mechanical properties but reduced flame retardancy (composition 11). Replacing KSS with phosphorus-based flame retardant BPADP resulted in lower HDT and impact properties (compositions 12 and 13). These data indicate that the use of KSS in the composition provides a composition with the requisite mechanical properties and flame retardancy required for polycarbonate compositions suitable for thin wall applications. Comparing compositions 2 and 11, it can be noticed that the use of KSS, a sulfonate flame retardant, provides superior flame retardancy over NaTs, also a sulfonate flame retardant. Composition 13 shows that by using BPADP, this grade can have V0@1.2mm but lose RTI w / Imp. Therefore, KSS can impart FR performance at V0@1.2mm, where ...

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Abstract

Electronics housings that include a thermoplastic composition are provided. The thermoplastic compositions include at least one polycarbonate, at least two polysiloxane- polycarbonate copolymers, and a flame retardant. The thermoplastic compositions can include an additional polycarbonate, an impact modifier, one or more additives, or any combination of these components. Methods used to prepare the thermoplastic compositions and electronics housings are also provided.

Description

technical field [0001] The present disclosure relates generally to polycarbonate compositions comprising polysiloxane-polycarbonate copolymers and flame retardants, methods of using the compositions, and methods for making the copolymers and compositions. Background technique [0002] Polycarbonate compositions comprising polysiloxane-polycarbonate copolymers generally have useful flame retardancy and mechanical properties, and are useful in the manufacture of articles related to the protection of electronic devices, such as housing assemblies. In particular, polycarbonate compositions with opaque polysiloxane-polycarbonate copolymers have good impact resistance, chemical resistance, and are resistant to incorporation of colorants and fillers. However, opaque polysiloxane-polycarbonate copolymers have large siloxane domain sizes, and their use can result in articles with cosmetic defects such as delamination, gate whitening, and pearlescence. Replacing opaque polysiloxane-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L27/18C08L83/10C08L33/12C08K5/42C08K3/04
CPCC08L69/00C08L83/10C08L2203/20C08L2205/035C08L2205/025C08L2207/53C08L27/18C08K5/42C08K3/04C08L33/12C08L27/12C08G77/448C08L25/12C08L2201/02H05K5/02
Inventor 官冰陈亚刚杨剑
Owner SHPP GLOBAL TECH BV
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