Functional PETG resin composition for cosmetic container molding

Abstract

The present invention provides a functional resin composition for molding cosmetic containers, characterized in that it comprises a base resin and an additive, wherein the base resin is polyethylene terephthalate glycol resin and the additive comprises PBT, a UV blocker, and a heat resistance improver. According to the present invention, by using PETG as a molding material for cosmetic containers, it is possible to manufacture cosmetic containers that have excellent heat resistance while ensuring transparency. In addition, the cosmetic container can block ultraviolet rays, infrared rays, etc., thereby extending the shelf life of the stored cosmetic and preventing the cosmetic from spoiling.

Description

Technology Field

[0001] The present invention relates to a technology for manufacturing cosmetic containers, and more specifically, to a functional PETG resin used as a raw material for manufacturing cosmetic containers that enables storage stability for cosmetics and prevents contamination. Background Technology

[0002] Generally, cosmetics are products used on the human body to cleanse and beautify the body, enhance attractiveness, brighten the appearance, or maintain or improve the health of the skin and hair. They include functional cosmetics that help improve skin whitening or reduce wrinkles, provide a smooth tan, or protect the skin from ultraviolet rays, and come in a wide variety of types.

[0003] Cosmetic containers are essential for the convenience of use and storage of these cosmetics; most of these containers are manufactured from composite materials such as plastic, glass, and metal, and post-processing, such as coloring or glossing, is sometimes performed as needed.

[0004] Cosmetic containers can be said to exhibit characteristics that accompany the growth of cosmetics in satisfying the desire for beauty. As diverse and new cosmetic formulations and technologies continue to advance, the development of containers to reflect these advancements is taking place in tandem, and the industry is dedicating research and development efforts to reflect the diverse needs of customers.

[0005] Meanwhile, cosmetics used in containers have conditions where contamination by microorganisms can easily occur due to the material characteristics themselves, and since consumers use them daily or frequently, they face an environment where they can be easily contaminated by various bacteria.

[0006] Cosmetic compositions are manufactured by including antimicrobial agents and preservatives, but cosmetic containers, which are mainly injection-molded using plastic materials, are manufactured without including separate antimicrobial agents, and thus become contaminated with bacteria or are exposed to sunlight or lighting in the usage environment, which causes the storage and shelf life of the cosmetic to be shortened.

[0007] In addition, the plastic materials used for cosmetic containers are generally made of thermoplastic resins and have the weakness of being susceptible to heat. Prior art literature

[0008] Korean Registration No. 10-2216835 (Noticed February 17, 2021) Korean Registration No. 10-2074583 (Noticed March 2, 2020) The problem to be solved

[0009] The present invention was devised to overcome the above technical problems and aims to provide a functional resin composition for molding cosmetic containers having flame retardancy, ultraviolet blocking, and infrared blocking properties for manufacturing transparent and high-quality cosmetic containers. means of solving the problem

[0010] To achieve the above objective, the present invention comprises a base resin and an additive, and

[0011] The present invention provides a functional resin composition for molding cosmetic containers, characterized in that the base resin is polyethylene terephthalate glycol resin and the additive comprises PBT, a UV blocker, and a heat resistance improver.

[0012] The additive is characterized by comprising 10 to 30 parts by weight based on 100 parts by weight of the base resin.

[0013] The above additive is characterized by comprising 70 wt% PBT, 20 wt% UV blocker, and 10 wt% heat resistance improver.

[0014] The above-mentioned sunscreen is characterized by comprising one or more of indium tin oxide (ITO) and tin antimony oxide (ATO).

[0015] The above heat resistance improving agent is characterized as a phosphorus-based flame retardant, specifically a phosphorus-silicon flame retardant mixed with tetraphenyl resorcinol-bis(diphenyl phosphate) and silsesqueoxane. Effects of the invention

[0016] According to the present invention, by using PETG as a molding material for cosmetic containers, it is possible to manufacture cosmetic containers that have excellent heat resistance while ensuring transparency.

[0017] In addition, the cosmetic container can block ultraviolet rays, infrared rays, etc., thereby extending the shelf life of the stored cosmetic and preventing the cosmetic from spoiling. Specific details for implementing the invention

[0018] Specific structural or functional descriptions of embodiments of the present invention disclosed in this specification or application are merely illustrative for the purpose of explaining embodiments according to the present invention, and embodiments according to the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application.

[0019] Since embodiments according to the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit embodiments according to the concept of the present invention to specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0020] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification.

[0021] The present invention relates to a functional resin composition for molding cosmetic containers, characterized in that it comprises a base resin and an additive, wherein the base resin is polyethylene terephthalate glycol resin and the additive comprises PBT, a UV blocker, and a heat resistance improver.

[0022] In the present invention, polyethylene terephthalate glycol resin (PETG) is used as the base resin. PETG is obtained by condensation polymerization of terephthalic acid, ethylene glycol (EG), and 1,4-cyclohexanedimethanol (CHDM) to form a PETG ternary copolyester. By introducing CHDM, which has significant steric hindrance, into the PET polymer chain, PETG loses its crystallization ability when the content of CHDM monomer units exceeds a certain level. In particular, when the molar ratio of 1,4-cyclohexanedimethanol (CHDM) to ethylene glycol (EG) is between 30 / 70 and 50 / 50, it becomes amorphous and exhibits the characteristics of a transparent copolyester.

[0023] The glass transition temperature and alkali resistance of PETG tend to increase with increasing molar ratio of CHDM. PETG exhibits non-toxicity, high strength, and excellent transparency; however, this results in high transmittance to ultraviolet and infrared rays, and relatively poor heat resistance.

[0024] Accordingly, the present invention is characterized by including 10 to 30 parts by weight of the additive based on 100 parts by weight of the base resin to improve heat resistance and ultraviolet and infrared blocking properties.

[0025] The additive of the present invention is characterized by comprising 70 wt% PBT, 20 wt% UV blocker, and 10 wt% heat resistance improver. Polybutylene terephthalate (PBT) is a type of polyester and is a material that has excellent physical properties, strong chemical resistance, and excellent processing characteristics. The reason for adding PBT is to improve chemical resistance and impact resistance.

[0026] 99.9% of the solar electromagnetic radiation energy reaching the Earth is concentrated in the ultraviolet, visible, and infrared regions. Of this, ultraviolet radiation (wavelength <400 nm) accounts for about 7–8%, visible light (wavelength 400–760 nm) accounts for about 46–50%, and infrared radiation (>760 nm) accounts for about 43–46%. Infrared radiation in the solar spectrum has thermal radiation and heating effects, which can raise the temperature of objects irradiated; therefore, it is necessary to shield infrared radiation in certain seasons and locations (e.g., inside a car or indoors during a hot summer) to reduce the temperature rise. It is necessary to design transparent cosmetic containers that can block radiant energy in unnecessary wavelength ranges from sunlight irradiated onto the container, thereby effectively blocking ultraviolet and infrared radiation while allowing visible light to pass through.

[0027] Accordingly, the present invention includes a blocking agent capable of blocking ultraviolet and infrared rays. The blocking agent for ultraviolet and infrared rays may include one or more of indium tin oxide (ITO) and tin antimony oxide (ATO). Alternatively, one or more of ITO-g-MMA and ATO-g-MMA may be used, in which methyl methacrylate (MMA) is grafted onto the surface of ITO (indium tin oxide) or ATO (tin antimony oxide).

[0028] The present invention includes 10 wt% of a heat resistance improver among the additives. The heat resistance improver performs the function of preventing the cosmetic container made of PETG resin according to the present invention from deteriorating or deforming or losing transparency due to heat from the surrounding environment.

[0029] The heat resistance modifier is a phosphoric acid-silicon mixture of tetraphenyl resorcinol-bis(diphenyl phosphate) and silsesqueoxane. Tetraphenyl resorcinol-bis(diphenyl phosphate) is PX-200 from Daihachi. ® As (CAS No. 139189-30-3), or Sol-DP from ICL-IP ® It is commercially available as.

[0030] Silsesquioxane has the chemical formula [RSiO 3 / 2 It is an organosilicon compound having ]n (R = H, alkyl, aryl, alkenyl, or alkoxyl, n=8~12). Silsesquioxanes are colorless solids that adopt a cage-type or polymeric structure with Si-O-Si bonds and tetrahedral Si vertices. The mixing ratio of the phosphorus-silicon-based mixture, which is the heat resistance improver, is a 3:1 weight ratio of tetraphenyl resorcinol-bis(diphenyl phosphate) and silsesquioxane.

[0031] The above additives, namely PBT, UV blockers, and heat resistance improvers, are first manufactured into masterbatch chips. The masterbatch chips are manufactured through an extrusion molding process. The extrusion molding machine is a twin-screw co-extruder, with an element-type screw, an effective length-to-screw diameter ratio (L / D) of 28 to 52, a mixing zone consisting of two areas, and a gas vent line consisting of a vacuum gas venting device. The term "twin-screw co-extruder" means that the screw shafts are arranged parallel to each other in the extruder body. The masterbatch chips are manufactured by extruding while mixing and feeding the additive raw materials, including the PBT, between the two parallel screw shafts.

[0032] A functional resin composition for molding cosmetic containers is finally prepared by mixing and adding 10 to 30 parts by weight of masterbatch chips to 100 parts by weight of PETG resin, which is a base resin, using a twin-screw extruder. The functional resin composition for molding cosmetic containers prepared in this way can be manufactured into cosmetic containers of various uses and types by vacuum forming, extrusion, and injection molding methods.

[0033] Specific embodiments of the present invention have been described above. However, those skilled in the art will understand that the spirit and scope of the present invention are not limited to these specific embodiments, and that various modifications and variations are possible within the scope of not altering the essence of the invention.

[0034] Accordingly, the embodiments described above are provided to fully inform those skilled in the art of the scope of the invention and should be understood as illustrative in all respects and not restrictive, and the invention is defined only by the scope of the claims.

Claims

Claim 1 A functional resin composition for molding cosmetic containers, characterized by comprising a base resin and an additive, wherein the base resin is polyethylene terephthalate glycol resin and the additive comprises PBT, a UV blocker, and a heat resistance improver. Claim 2 A functional resin composition for molding cosmetic containers according to claim 1, characterized in that the additive comprises 10 to 30 parts by weight based on 100 parts by weight of the base resin. Claim 3 A functional resin composition for molding cosmetic containers according to claim 1, characterized in that the additive comprises 70 wt% PBT, 20 wt% UV blocker, and 10 wt% heat resistance improver. Claim 4 A functional resin composition for molding cosmetic containers according to claim 1, characterized in that the UV blocker comprises one or more of indium tin oxide (ITO) and tin antimony oxide (ATO). Claim 5 A functional resin composition for molding cosmetic containers according to claim 1, characterized in that the heat resistance improving agent is a phosphoric acid-silicone mixture of tetraphenyl resorcinol-bis(diphenyl phosphate) and silsesqueoxane.

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