Flame retardant and scratch resistant thermoplastic polycarbonate compositions
A thermoplastic composition and polycarbonate technology, applied in the field of thermoplastic compositions, can solve problems such as unfavorable processability, hydrolysis stability, flame retardant performance, low temperature impact strength, and scratch resistance.
Active Publication Date: 2012-05-23
SHPP GLOBAL TECH BV
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- Description
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- Application Information
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Problems solved by technology
Although many impact modifiers are suitable for their intended use of improving toughness, they can also adversely affect other properties such as processability, hydrolytic stability, flame retardancy and / or low temperature impact strength, and scratch resistance
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[0025] The present inventors have discovered that the use of specific impact modifier components in combination with polycarbonate homopolymers or copolymers containing carbonate repeating units of a specific structure and a flame retardant greatly improves the performance of polycarbonate containing polycarbonate. The balance of various physical properties (such as impact strength and fluidity and scratch resistance) of the thermoplastic composition, while maintaining its excellent flame retardant properties. This improvement in physical properties without significantly detrimental effect on flame retardant performance is highly unexpected, especially in the case of higher levels of butadiene in the composition, since similar compositions Flame retardancy and physical properties can be significantly inferior. It has also been found that by using specific combinations of impact modifiers and flame retardants a favorable combination of other physical properties can be obtained ...
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Abstract
A thermoplastic composition comprising in combination a polycarbonate homopolymer or copolymer comprising repeat carbonate units having the following structure: wherein R1 and R2 are independently at each occurrence a C1-C4 alkyl, n and p are each an integer having a value of 1 to 4, and T is selected from the group consisting of C5-C10 cycloalkanes attached to the aryl groups at one or two carbons, C1-C5 alkyl groups, C6-C13 aryl groups, and C7-C12 aryl alkyl groups; an impact modifier, wherein the impact modifier comprises a first impact modifier comprising a polycarbonate-polysiloxane copolymer and a second impact modifier different from the first impact modifier; and a flame retardant is disclosed. The compositions have excellent scratch resistance as well as an improved balance of physical properties such as impact strength and spiral flow, while at the same time maintaining their good flame performance.
Description
Background technique [0001] The present invention relates to flame retardant thermoplastic compositions comprising aromatic polycarbonates, methods of their manufacture and methods of their use, and in particular impact-modified thermoplastic polycarbonate compositions having improved scratch resistance. [0002] Polycarbonates have been used to manufacture articles and components for a wide variety of applications, from automotive components to electronic devices. Due to its wide variety of uses, especially in electronic applications, it is desirable to make polycarbonate scratch resistant and flame retardant. Many known flame retardants for polycarbonates contain bromine and / or chlorine. Brominated and / or chlorinated flame retardants are less desirable because impurities and / or by-products derived from these flame retardants can corrode equipment involved in the manufacture and use of polycarbonate. Brominated and / or chlorinated flame retardants are also increasingly subje...
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IPC IPC(8): C08L69/00
CPCC08L51/04C08L69/00C08L53/00C08L83/10C08L55/02C08K5/523C08K5/005C08L2666/02C08L83/04C08L55/00
Inventor 斯里尼瓦斯·斯里普拉普内文·阿加沃尔简·P·伦斯
Owner SHPP GLOBAL TECH BV