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CN-121986139-A - Flame retardant polycarbonate compositions with improved hydrolytic stability

CN121986139ACN 121986139 ACN121986139 ACN 121986139ACN-121986139-A

Abstract

The thermoplastic composition comprises about 5.5 wt% to about 99. 99 wt% of a polycarbonate homopolymer component, and about 0.01. 0.01 wt% to about 5.5 wt% of sodium zirconium phosphate. The polycarbonate homopolymer component has improved molecular weight (Mw) retention characteristics after heat aging at high temperature and relative humidity conditions. The composition also has good low temperature impact properties.

Inventors

  • CHEN KERAN
  • SHAN WEI
  • ZHENG YUN

Assignees

  • 高新特殊工程塑料全球技术有限公司

Dates

Publication Date
20260505
Application Date
20241008
Priority Date
20231011

Claims (15)

  1. 1. A thermoplastic composition comprising: About 5 wt% to about 99% wt% of a polycarbonate homopolymer component, and From about 0.01 wt% to about 5% wt% sodium zirconium phosphate, Wherein the combined weight percent value of all components is no more than 100 wt% and all weight percent values are based on the total weight of the composition.
  2. 2. The thermoplastic composition of claim 1, wherein the composition further comprises from about 1 wt% to about 40 wt% of a polycarbonate-siloxane copolymer component.
  3. 3. The thermoplastic composition of claim 2, wherein the polycarbonate-siloxane copolymer has a siloxane content of about 5 wt% to about 45 wt% based on the total weight of the polycarbonate-siloxane copolymer component.
  4. 4. The thermoplastic composition of claim 3, wherein the polycarbonate-siloxane copolymer has a siloxane content of about 15 wt% to about 25% wt%.
  5. 5. The thermoplastic composition of any of claims 1-4, wherein the composition further comprises from about 0.1 wt% to about 15: 15 wt% of a flame retardant component.
  6. 6. The thermoplastic composition of claim 5, wherein the flame retardant component comprises a phosphorus-based flame retardant.
  7. 7. The thermoplastic composition of claim 6, wherein the composition comprises at least 1.5 wt% of the phosphorus-based flame retardant.
  8. 8. The thermoplastic composition of any of claims 1-7, wherein the composition further comprises from greater than 0 wt% to about 2 wt% of a Polytetrafluoroethylene (PTFE) component.
  9. 9. The thermoplastic composition of any of claims 1-4, wherein the composition comprises about 0.01 wt% to 1 wt% of the sodium zirconium phosphate.
  10. 10. The thermoplastic composition of any of claims 1-9, wherein the composition has a total siloxane content of about 0.5 wt% to about 15 wt%.
  11. 11. The thermoplastic composition of any of claims 1-10, wherein the composition further comprises from greater than 0wt% to about 1 wt% of at least one additional additive, wherein the at least one additional additive comprises an acid scavenger, an anti-drip agent, an antioxidant, an antistatic agent, a chain extender, a colorant, a mold release agent, a flow promoter, a lubricant, a plasticizer, a quencher, a UV reflective additive, a blowing agent, a filler component, or a combination thereof.
  12. 12. The thermoplastic composition of any of claims 1-11, wherein the composition has a flame retardant rating of V0 or V1 at a thickness of 1.5 millimeters or less as evaluated according to UL 94.
  13. 13. The thermoplastic composition of any of claims 1-12, wherein the molecular weight (Mw) retention of the polycarbonate homopolymer component is the following: At least 70% after heat aging at a temperature of 85 ℃ and a relative humidity of 85% for 1000 hours, or At least 55% after heat aging at a temperature of 85 ℃ and a relative humidity of 85% for 2000 hours.
  14. 14. The thermoplastic composition of any of claims 1-13, wherein the composition has a Notched Izod Impact (NII) strength of at least 250 joules per meter (J/m) at a temperature of-40 ℃, wherein NII is evaluated according to ASTM D256.
  15. 15. An article comprising the thermoplastic composition of any one of claims 1 to 14, wherein the article is a personal accessory, an energy storage device, an electrical device, or a vehicle interior.

Description

Flame retardant polycarbonate compositions with improved hydrolytic stability Technical Field The present disclosure relates to thermoplastic compositions based on polycarbonate, and in particular to thermoplastic compositions comprising polycarbonate and sodium zirconium phosphate, which have good water stability and flame retardant properties. Background Polycarbonate polymers are widely used in a variety of applications such as electronics, household appliances, and building materials. To achieve UL94 Flame Retardancy (FR) for a particular application, FR agents such as phosphorus are typically added to the polycarbonate composition. To further improve the FR rating of the polycarbonate composition, an FR enhancer such as talc may be added. The phosphorus FR agent is acidic in nature, which may reduce the hydrolytic stability of the polycarbonate matrix. The inorganic filler may also reduce the water stability of the polycarbonate after humid heat (DH) aging, such as DH85 treatment at 85℃and 85% relative humidity for different durations (e.g., 500 hours, 1000 hours, 2000 hours, and 3000 hours). U.S. patent publication No. 2022/0389223 describes a thermoplastic composition comprising a homopolycarbonate, a poly (carbonate siloxane) component present in an amount effective to provide a total siloxane content of 0.5 to 20 wt%, an antimicrobial agent comprising silver zirconium phosphate, silver phosphate glass, or a combination thereof, and optionally an additive composition. Aspects of the present disclosure address these matters, and others. Disclosure of Invention Aspects of the present disclosure relate to thermoplastic compositions comprising from about 5 wt% to about 99% wt% of a polycarbonate homopolymer component, and from about 0.01 wt% to about 5% wt% of sodium zirconium phosphate. The polycarbonate homopolymer component has improved molecular weight (Mw) retention characteristics after heat aging at high temperature and relative humidity conditions. The composition also has good low temperature impact properties. Detailed Description Before the present compounds, compositions, articles, systems, devices, and/or methods are disclosed and described, it is to be understood that this is not limited to specific synthetic methods, unless otherwise specified, or to specific reagents, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting. The present disclosure encompasses various combinations of elements of the disclosure, for example from the dependent claims which depend on the same independent claim. Moreover, it should be appreciated that any method set forth herein is in no way intended to be construed as requiring that its steps be performed in a specific order, unless expressly stated otherwise. It is therefore in no way intended to infer an order in any way, insofar as the method claims do not actually recite an order to be followed by its steps or that steps are limited to a specific order in the claims or the description in other words. This applies to any possible non-expressed basis for interpretation, including matters concerning the arrangement of steps or logic of the operational flow, ordinary meanings derived from grammatical organization or punctuation, or the number or types of aspects described in the specification. All publications mentioned herein are incorporated herein by reference to disclose and describe the methods and/or materials in connection with which the publications are listed. Definition of the definition It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting. As used in the specification and in the claims, the term "comprising" may include aspects "consisting of (consisting of)" and "consisting essentially of (consisting essentially of)". Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. In this specification and the claims that follow, reference will be made to a number of terms that shall be defined herein. As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a polycarbonate homopolymer" includes a mixture of two or more polycarbonate homopolymers. As used herein, the term "combination" includes blends, mixtures, alloys, reaction products, and the like. Ranges can be expressed herein as from one value (first value) to another value (second value). When such a range is expressed, the range includes, in some aspects, one or both of the first value and the second value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will