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JP-7857088-B2 - Methods for producing resin compositions, molded articles, and pellets, and light transmittance enhancers.

JP7857088B2JP 7857088 B2JP7857088 B2JP 7857088B2JP-7857088-B2

Inventors

  • 濱島 宣幸

Assignees

  • 三菱エンジニアリングプラスチックス株式会社

Dates

Publication Date
20260512
Application Date
20210930

Claims (8)

  1. 100 parts by mass of thermoplastic resin, It contains 0.70 to 1.50 ppm by mass of a non-aromatic organoiron complex. The thermoplastic resin includes an amorphous resin, The aforementioned non-aromatic organic iron complex includes an acetylacetone iron complex. Resin composition.
  2. The resin composition according to claim 1, wherein the thermoplastic resin comprises an aromatic polycarbonate resin.
  3. The resin composition according to claim 1 or 2, further comprising an organic phosphite compound in a proportion of 0.005 to 0.3 parts by mass per 100 parts by mass of the thermoplastic resin.
  4. A molded article formed from the resin composition described in any one of claims 1 to 3.
  5. The process involves melt-kneading a composition containing 100 parts by mass of thermoplastic resin and 0.70 to 1.50 ppm by mass of a non-aromatic organic iron complex. The thermoplastic resin includes an amorphous resin, The aforementioned non-aromatic organic iron complex includes an acetylacetone iron complex. A method for manufacturing pellets.
  6. The method for producing pellets according to claim 5, wherein the composition further contains an organic phosphite compound in a proportion of 0.005 to 0.3 parts by mass per 100 parts by mass of the thermoplastic resin.
  7. An additive for improving the light transmittance of amorphous thermoplastic resins containing metal salt-based flame retardants, comprising an acetylacetone iron complex as a light transmittance enhancer.
  8. The light transmittance enhancer according to claim 7 , wherein the amorphous thermoplastic resin is an aromatic polycarbonate resin.

Description

This invention relates to a resin composition, a molded article, a method for producing pellets, and a light transmittance enhancer. Traditionally, thermoplastic resins such as polycarbonate resin have been widely used in various applications due to their excellent performance in various fields. Among these, one of the most active applications of thermoplastic resins, particularly polycarbonate resin, is in components requiring transparency, such as power covers, lighting lenses, lighting covers, and light guide members. For example, Patent Document 1 discloses an aromatic polycarbonate resin composition containing an aromatic polycarbonate resin (A), a phosphorus-based antioxidant (B), a fatty acid ester (C), and a specific aromatic compound (D), characterized in that, per 100 parts by weight of aromatic polycarbonate resin (A), it contains 0.01 to 0.1 parts by weight of phosphorus-based antioxidant (B), 0.01 to 0.5 parts by weight of fatty acid ester (C), and 0.0001 parts by weight or more and less than 0.05 parts by weight of the specific aromatic compound (D). Furthermore, it is stated that molded articles obtained from such resin compositions have high light transmittance. Japanese Patent Publication No. 2021-120458 The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"). Note that the following embodiment is illustrative for explaining the present invention, and the present invention is not limited to this embodiment. In this specification, "~" is used to mean that the numbers before and after it are included as the lower and upper limits, respectively. In this specification, all physical properties and characteristic values shall be those at 23°C unless otherwise specified. In this specification, the number-average molecular weight is a polystyrene-equivalent value measured by GPC (gel permeation chromatography). If the standards described herein differ in measurement methods, etc., from year to year, unless otherwise specified, the standards as of January 1, 2021 shall apply. The resin composition of this embodiment is characterized by containing 100 parts by mass of a thermoplastic resin and 0.08 to 3.50 ppm by mass of a non-aromatic organic iron complex. This configuration improves the light transmittance (particularly total light transmittance) of the thermoplastic resin. Furthermore, this effect can be maintained at a high level even when various resin additives are incorporated. Additionally, the inclusion of a non-aromatic organic iron complex effectively suppresses the increase in the YI value. <Thermoplastic resin> The resin composition of this embodiment includes a thermoplastic resin. Examples of thermoplastic resins include polycarbonate resin (PC resin); polystyrene resin (PS resin); acrylic resin; polyolefin resins such as polyethylene resin (PE resin), polypropylene resin (PP resin), cyclic cycloolefin resin (COP resin), and cyclic cycloolefin copolymer (COC) resin; polyamide resin (PA resin); polyimide resin (PI resin); polyetherimide resin (PEI resin); polyurethane resin (PU resin); polyphenylene ether resin (PPE resin); polyphenylene sulfide resin (PPS resin); polysulfone resin (PSU resin); and polymethacrylate resin (PMMA resin). Polycarbonate resin (PC resin), polystyrene resin (PS resin), and acrylic resin are preferred, polycarbonate resin is more preferred, and aromatic polycarbonate resin is even more preferred. The thermoplastic resin used in this embodiment may be a crystalline thermoplastic resin or an amorphous thermoplastic resin, but it is preferable to include an amorphous thermoplastic resin. Amorphous thermoplastic resins are transparent and therefore suitable for applications where improved light transmittance is required. However, even crystalline thermoplastic resins may be used as transparent materials, such as when molded without crystallization. In such cases, crystalline thermoplastic resins are also preferably used as the resin included in the resin composition of this embodiment. Furthermore, in this embodiment, a blend of amorphous and crystalline thermoplastic resins is also acceptable. In this embodiment, it is preferable that the thermoplastic resin is amorphous thermoplastic resin (preferably aromatic polycarbonate resin) at a concentration of 85% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and particularly preferably 97% by mass or more. The polycarbonate resin is not particularly limited as long as it contains a carbonate ester bond-containing -[O-R-OC(=O)]- unit in its molecular main chain (where R is an organic group, preferably a hydrocarbon group, more preferably an aliphatic group, an aromatic group, or a group containing both an aliphatic and an aromatic group, and furthermore, a linear or branched structure). In this embodiment, an aromatic polycarbonate resin is preferred, and a polycarbonate resin having a bisp