Polyoxymethylene compositions for food handling applications

Abstract

To provide: an improved polyacetal-based composition using an additive package suitable for food processing applications; and a molded article.SOLUTION: Provided is a polymer composition comprising: a polyoxymethylene polymer present in the polymer composition in an amount greater than about 60% by weight, the polyoxymethylene polymer having a melt volume flow rate of from about 1 cm3 per 10 min to about 80 cm3 per 10 min when tested at a temperature of 190°C and at a load of 2.16 kg; and an antioxidant, wherein the polymer composition is free of a guanamine, urea or melamine formaldehyde scavenger and displays a formaldehyde emission of less than about 15 ppm when tested according to VDA Test 275 and displays a formaldehyde extractable content of less than 15 ppm when tested according to a formaldehyde extractable test in water at a temperature of 40°C for 10 days.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] Related applications

[0001] This application claims priority under U.S. Provisional Application No. 62 / 719,883, filed on 20 August 2018, and U.S. Provisional Application No. 62 / 680,171, filed on 4 June 2018, both of which are incorporated herein by reference in their entirety. [Background technology]

[0002]

[0002] Polyacetal polymers, commonly known as polyoxymethylenes, have been established as exceptionally useful engineering materials for a variety of applications. Polyoxymethylene polymers are widely used, for example, in the construction of molded parts such as components for use in the automotive and electrical industries. Polyoxymethylene polymers have, for example, excellent mechanical properties, fatigue resistance, wear resistance, chemical resistance, and moldability.

[0003]

[0003] Polyacetal resins possess many useful properties, but this polymer tends to decompose when heated and is inherently unstable in oxidizing atmospheres or acidic or alkaline environments. On one hand, polyacetal resins tend to release formaldehyde during processing and after the polymer has been molded into parts. Those skilled in the art have tried combining polyacetal polymers with various additive compounds to reduce formaldehyde emissions. For example, polyacetal polymers have been combined with melamine in the past to achieve low formaldehyde emission performance. Various other compounds have also been proposed to reduce formaldehyde emissions. Various compounds used in the past have been successful in suppressing formaldehyde emissions from products made from polyoxymethylene polymers, but further improvements in formaldehyde emissions and xtractable content are needed.

[0004]

[0004] Other additives, such as processing aids and polymerization accelerators, are often used in the production of polyacetal resins.

[0005]

[0005] Generally, even if there are existing additive compounds suitable for food handling applications, it is desirable to obtain a polyacetal polymer using additives suitable for food handling applications that exhibit performance equivalent to or better than those existing additive compounds.

[0006]

[0006] In view of the above, there is a demand for improved polyacetal-based compositions using additive packaging suitable for food handling applications. [Overview of the Initiative]

[0007]

[0007] Generally, the present disclosure is directed toward polyoxymethylene polymer compositions particularly well suited for food contact applications. The polymer compositions of the present disclosure are specially formulated to have dramatically low formaldehyde eluting and formaldehyde emission levels without the use of many conventional additives. For example, the polymer compositions of the present disclosure are The polymer composition can be formulated without anamineformaldehyde scavenger, ureaformaldehyde scavenger, melamineformaldehyde scavenger, or dicyandiamideformaldehyde scavenger, and in one embodiment, it contains no formaldehyde scavenger at all. Furthermore, the polymer composition can be formulated to be free of citrates and / or polymeric nucleants. For example, in one embodiment, the polymer composition contains an inorganic nucleant.

[0008]

[0008] In one embodiment, the polymer composition contains a polyoxymethylene polymer. The polyoxymethylene polymer may be present in the polymer composition in an amount exceeding about 50% by weight, for example, exceeding about 60% by weight, for example, exceeding about 70% by weight, for example, exceeding about 80% by weight, for example, exceeding about 90% by weight. The polyoxymethylene polymer is present in an amount exceeding about 1 cm when tested at 190°C and a load of 2.16 kg. 3 / 10 minutes ~ approx. 80cm 3 It may have a melt volume flow rate of / 10 minutes. In one embodiment, For example, the melt volume flow rate is approximately 6 cm 3 / 10 minutes ~ approx. 28cm 3 It could be 10 minutes. Alternatively, polyoxymethylene polymer can take about 30 cm 3 / 10 minutes ~ approximately 55cm 3 It may have a melt flow rate of / 10 minutes.

[0009]

[0009] The polyoxymethylene polymer is combined with an inorganic nucleating agent and optionally with an antioxidant, an acid scavenger, and a lubricant. As described above, the polymer composition does not have to substantially contain a formaldehyde scavenger, but still exhibits formaldehyde emissions of less than about 15 ppm, e.g., less than about 12 ppm, e.g., less than about 10 ppm, e.g., less than about 8 ppm, e.g., less than about 6 ppm, e.g., less than 4 ppm, when tested according to VDA Test 275. The polymer composition may also exhibit a formaldehyde eluting level of less than about 15 ppm, e.g., less than about 12 ppm, e.g., less than 10 ppm, when tested in water at a temperature of 140°C for 10 days. The polymer composition may also have the above formaldehyde eluting level when tested in water at 100°C for 30 minutes.

[0010]

[0010] In one embodiment, the inorganic nucleating agent includes talc. The talc is present in the polymer composition. For example, it may be present in an amount of about 0.01% to about 1% by weight. The polymer composition may also contain an acid scavenger containing a carboxylate. For example, the acid scavenger may include an alkaline earth metal salt of a carboxylic acid, such as calcium hydroxystearate. In one embodiment, for example, the acid scavenger is calcium 12-hydroxystearate and is present in the polymer composition in an amount of about 0.01% to about 1% by weight.

[0011]

[0011] The polymer composition may optionally contain an antioxidant and / or a lubricant. The lubricant may include a wax of natural origin, such as a wax of plant origin. For example, the lubricant may include ethylene bis(stearamide). The lubricant may be present in the polymer composition in an amount of about 0.01% to about 1% by weight. <000>

[0012]

[0012] In one embodiment, the polymer composition can contain one or more colorants. However, in one embodiment, the polymer composition may not contain an iron oxide pigment. In one embodiment, the colorant can be combined with a polymer that aids in the dispersion of the colorant within the polymer matrix. The polymer used to disperse the colorant may include the above lubricant. For example, the polymer dispersant may include a polyolefin polymer such as polyethylene wax. The polyethylene wax may include a non-polar wax having a medium molecular weight. The molecular weight of the polyethylene wax is, for example, less than about 10,000 g / mol, for example less than about 8,000 g / mol, for example less than about 6,000 g / mol, for example less than about 4,000 g / mol, and generally greater than about 100 g / mol, for example greater than about 500 g / mol, for example greater than about 1,000 g / mol. The polyethylene wax has a density of about 0.9 g / cm 3 to about 0.95 g / cm 3 For example, about 0.92 g / cm 3 to about 0.94 g / cm 3 and may have.

[0013]

[0013] The polymer composition is a thermoplastic elastomer such as a thermoplastic polyurethane elastomer It may also contain tomer.

[0014] A variety of different molded articles can be manufactured in accordance with the present disclosure. As described above, the molded article is particularly well-suited for use in food contact applications. For example, in one aspect, the molded article may include parts of consumer appliances, such as parts of a coffee maker. The molded article may also include conveyor parts, such as conveyor parts incorporated into conveyors for food industry applications. The present disclosure is also well-suited for the manufacture of medical products.

[0014]

[0015] Other features and aspects of the present disclosure are discussed in more detail below.

[0016] The complete and enabling disclosure of the present disclosure is described in more detail later in this specification, including reference to the accompanying drawings. half.

Brief Description of the Drawings

[0015] [Figure 1] FIG. 1 shows one aspect of a coffee maker apparatus including a composition manufactured in accordance with the present disclosure. [Figure 2] FIG. 2 shows one aspect of a member of a coffee maker apparatus including a composition manufactured in accordance with the present disclosure. [Figure 3] FIG. 3 shows one aspect of a medical device including a composition manufactured in accordance with the present disclosure. [Figure 4] FIG. 4 shows another aspect of a medical device including a composition manufactured in accordance with the present disclosure. [Figure 5] FIG. 5 shows one aspect of a conveyor apparatus including a composition manufactured in accordance with the present disclosure. [Figure 6] FIG. 6 shows one aspect of a cosmetic closure apparatus including a composition manufactured in accordance with the present disclosure.

[0016]

[0017] The repeated use of reference characters (codes) in this specification and the drawings represents the same or It shall represent similar characteristics or elements. [Modes for carrying out the invention]

[0017]

[0018] Those skilled in the art will know that this discussion is merely an illustrative description of the broader aspects of this disclosure. It should be clear that this is not intended to be a limiting feature.

[0019] Generally, this disclosure relates to additive packages containing additives suitable for food processing applications. This is directed towards polyacetal or polyoxymethylene (POM)-based compositions containing [the specified substance].

[0018]

[0020] For example, POM manufactured in accordance with this disclosure may, in some embodiments, be beneficial. Furthermore, good crystallization performance can be achieved without synthetic or polymer nucleating agents such as polyoxymethylene polymer nucleating agents. POM may also be free of one or more polyvinylidene fluoride nucleating agents, benzoic acid derivative nucleating agents, phosphate nucleating agents, carboxylate nucleating agents, sorbital-based nucleating agents, and polyamide nucleating agents. Beneficially, POM compositions can contain inorganic nucleating agents such as talc or clay (e.g., bentonite, calcined kaolin) compounds, which are suitable for food processing applications.

[0019]

[0021] Among the additional advantages, POM manufactured in accordance with this disclosure is manufactured according to standard methods (e.g., V As measured by DA 275, GB4806.6-2016), low formaldehyde release, elution potential, or both can be observed even without containing any formaldehyde scavenger package. In some embodiments, the POM may not contain certain formaldehyde scavenging compositions, such as those containing one or more guanamine compounds (e.g., aliphatic guanamine-based compounds, alicyclic guanamine-based compounds, aromatic guanamine-based compounds, heteroatom-containing guanamine-based compounds, etc.), hydantoin compounds, copolyamide compounds, amino acid compounds (e.g., monoaminomonocarboxylic acids, monoaminodicarboxylic acids, or arginine), melamine compounds, and urea compounds. For example, the POM composition may not contain one or more benzoguanamine, dicyandiamide, and allantoin. However, in some cases, dicyandiamide may not be present. Formaldehyde scavengers containing amides and copolyamides, such as nylon terpolymers (e.g., nylon 66 / 610 / 6), may also be optionally used.

[0020]

[0022] Among the additional advantages, POM compositions manufactured in accordance with this disclosure are formaldehyde-free. The hydride release levels and formaldehyde leaching levels may fall within the range specified by various food contact regulations, such as FDA food contact standards, e.g., Federal Regulatory Standards (CFR) Chapter 21; EU food contact standards, e.g., Regulation (EC) No. 1935 / 2004, 2023 / 2006, 10 / 2011, Resolution AP(89)1, German BfR IX, Spanish Real Decreto 847 / 2011, and Italian Decreto 21 / 3 / 73; and Chinese food contact standards, e.g., GB 9685-2016.

[0021]

[0023] The production of polyoxymethylene polymers involves polyoxymethylene-forming monomers, for example. For example, this can be carried out by polymerizing trioxane or a mixture of trioxane and a cyclic acetal such as dioxolane in the presence of a molecular weight modifier such as glycol. The polyoxymethylene polymer used in the polymer composition may include homopolymers or copolymers. According to one embodiment, the polyoxymethylene is a homopolymer or copolymer containing at least 50 mol%, for example at least 75 mol%, for example at least 90 mol%, and for example even further at least 97 mol%, of -CH2O- repeating units.

[0022]

[0024] In one embodiment, a polyoxymethylene copolymer is used. The copolymer may contain about 0.01 mol% to about 20 mol%, particularly about 0.5 mol% to about 10 mol%, of repeating units. The repeating units include a saturated or ethylenically unsaturated alkylene group or a cycloalkylene group having at least two carbon atoms, having a sulfur atom or an oxygen atom in the chain, and may contain one or more substituents selected from the group consisting of alkyl, cycloalkyl, aryl, aralkyl, heteroaryl, halogen, or alkoxy. In one embodiment, a cyclic ether or acetal that can be introduced into the copolymer by a ring-opening reaction is used.

[0023]

[0025] A suitable cyclic ether or acetal is given by formula:

[0024] [ka]

[0025] It is such that in the formula x is 0 or 1, and R 2 The group is a C2-C4 alkylene group and, where appropriate, has one or more substituents which are a C1-C4 alkyl group or a C1-C4 alkoxy group and / or a halogen atom, preferably a chlorine atom. Just some examples are ethylene oxide, propylene 1,2-oxide, butylene 1,2-oxide, butylene 1,3-oxide, 1,3-dioxane, 1,3-dioxolane, and 1,3-di Oxepane can be used as a cyclic ether, and linear oligo- or polyformal materials, such as polydioxolane or polydioxepane, can also be used as comonomers. It is particularly beneficial to use copolymers composed of 99.5 to 95 mol% trioxane and 0.01 to 5 mol%, for example, 0.5 to 4 mol%, of one of the above comonomers. In one embodiment, the polyoxymethylene polymer contains a relatively small amount of comonomer. For example, the comonomer may be present in an amount of less than about 2 mol%, for example less than about 1.5 mol%, for example less than about 1 mol%, for example less than about 0.8 mol%, for example less than about 0.6 mol%.

[0026]

[0026] Polymerization can be carried out as precipitation polymerization or in a molten material. Polymerization time or molecular weight adjustment By appropriately selecting polymerization parameters such as the amount of the agent, the molecular weight of the resulting polymer, and consequently the MVR value, can be adjusted.

[0027]

[0027] In one embodiment, the polyoxymethylene polymer used in the polymer composition is It may contain a relatively large amount of reactive or functional groups at its terminal positions. The reactive groups may include, for example, -OH or -NH2 groups.

[0028]

[0028] In one embodiment, the polyoxymethylene polymer has terminal hydroxyl groups, for example A polymer may have hydroxyethylene groups and / or hydroxyl side groups in more than about 50% of all terminal sites on the polymer. For example, a polyoxymethylene polymer may have at least about 70%, for example at least about 80%, or for example at least about 85% of its terminal groups being hydroxyl groups, based on the total number of terminal groups present. The total number of terminal groups present should be understood to include all side-terminal groups.

[0029]

[0029] In one embodiment, the polyoxymethylene polymer is at least 15 mmol / The polyoxymethylene polymer has a terminal hydroxyl group content of, for example, at least 18 mmol / kg, or at least 20 mmol / kg. In one embodiment, the terminal hydroxyl group content is in the range of 18 to 50 mmol / kg. In an alternative embodiment, the polyoxymethylene polymer may contain terminal hydroxyl groups in amounts less than 20 mmol / kg, for example less than 18 mmol / kg, or for example less than 15 mmol / kg. For example, the polyoxymethylene polymer may contain terminal hydroxyl groups in amounts of about 5 mmol / kg to about 20 mmol / kg, for example about 5 mmol / kg to about 15 mmol / kg. For example, a polyoxymethylene polymer with a low terminal hydroxyl group content but a high melt volume flow rate may be used.

[0030]

[0030] In addition to or instead of terminal hydroxyl groups, polyoxymethylene polymer These polymers may also have other end groups that are common in these polymers. Examples of these include alkoxy groups, formic groups, acetate groups, or aldehyde groups. In one embodiment, the polyoxymethylene is a homo or copolymer containing at least 50 mol%, for example at least 75 mol%, for example at least 90 mol%, and for example even more than 95 mol%, of -CH2O- repeating units.

[0031]

[0031] In one embodiment, a polyoxymethylene polymer is obtained by a cationic polymerization method and It can be produced by removing any unstable end groups through subsequent solution hydrolysis. During cationic polymerization, glycols such as ethylene glycol or methylal can be used as chain termination agents. Heteropoly acids, trifluoromethanesulfonic acid (triflic acid), or boron compounds can be used as catalysts.

[0032]

[0032] The polyoxymethylene polymer can have any suitable molecular weight. The molecular weight of the polymer can be, for example, about 4,000 g / mol to about 20,000 g / mol. However, in other embodiments, the molecular weight may be much higher than 20,000 g / mol, for example, about 20,000 g / mol to about 100,000 g / mol.

[0033]

[0033] Polyoxymethylene polymers present in the composition are generally ISO 11 When measured at 190°C and 2.16 kg according to 33, the result was approximately 0.1 to 80 cm. 3 It may have a melt flow index (MFI) in the range of / 10 min. In one embodiment, the polyoxymethylene polymer is about 1 cm 3 Larger than 10 minutes, for example, about 2 cm 3 Larger than 10 minutes, for example, about 5cm 3 Larger than 10 minutes, for example, about 10cm 3 Larger than 10 minutes, for example, about 20cm 3 Larger than 10 minutes, for example, about 30cm 3 The polymer may have a melt flow index greater than 10 minutes. 3 Less than 10 minutes, for example, about 45cm 3 / Less than 10 minutes, for example, about 35cm 3 Less than 10 minutes, for example, about 25cm 3 / Less than 10 minutes, for example, about 15cm 3 / Less than 10 minutes, for example, about 10cm 3 / Less than 10 minutes, for example, about 5cm 3 It may have a meltflow index of less than 10 minutes.

[0034]

[0034] Polyoxymethylene polymer is present in small amounts in the polyoxymethylene polymer composition. At least 50 wt%, for example, at least 60 wt%, for example, at least 70 wt%, for example, at least 80 wt%. For example, it may be present in amounts of at least 85 wt%, for example, at least 90 wt%, for example, at least 93 wt%. In general, the polyoxymethylene polymer is present in amounts of less than about 100 wt%, for example, less than about 99 wt%, for example, less than 97 wt%. Here, the weight is based on the total weight of the polyoxymethylene polymer composition.

[0035]

[0035] The polymer compositions of this disclosure may contain various additives and components. For example, In this case, the polymer composition may contain an acid scavenger. The acid scavenger may contain a carboxylate salt.

[0036]

[0036] For example, a carboxylate salt may include a salt of a fatty acid, such as a metal salt of a fatty acid. Carboxylate salts may include alkaline earth metal salts of fatty acids. The cations of the salt may include, for example, calcium, barium, lithium, sodium, magnesium, zinc, and the like.

[0037]

[0037] Fatty acids generally contain carbon chains of about 3 to 20 carbon atoms. It is possible. The fatty acid may contain dicarboxylic acid or tricarboxylic acid.

[0038] In one aspect, the metal salts of fatty acids are citric acid, propionic acid, and stearic acid. The composition may include one or more metal salts of butanoic acid, hexanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, etc. In one particular embodiment, the metal salt of the fatty acid may include lithium 12-hydroxystearate, calcium 12-hydroxystearate, calcium stearate, and mixtures thereof. In some cases, citric acid and its salts (e.g., tricalcium citrate) may be included in the POM composition, but the composition may not include the salts of citric acid.

[0038]

[0039] One or more carboxylates are typically present in the polymer composition at a concentration of about 0.001 wt. They are present in amounts exceeding a certain percentage by weight, for example, more than about 0.01% by weight, more than about 0.05% by weight, more than about 0.1% by weight, more than about 0.2% by weight, more than about 0.3% by weight, more than about 0.4% by weight, or more than about 0.5% by weight. One or more carboxylates are generally present in the polymer composition in amounts less than about 5% by weight, for example, less than about 3% by weight, more than about 2% by weight, more than about 1.5% by weight, or less than about 1% by weight.

[0039]

[0040] The polymer compositions of this disclosure may contain other known additives, such as antioxidants and UV oxidants. The composition may contain a stabilizing agent or heat stabilizer, an impact resistance modifier and / or reinforcing fibers. Furthermore, the composition may contain processing aids, such as adhesion promoters, lubricants, nucleating agents, release agents, fillers, or antistatic agents, as well as additives that impart desired properties to the composition and the products or parts manufactured therefrom.

[0040]

[0041] In one embodiment, a nucleating agent may be present. The nucleating agent can increase the degree of crystallinity. It may contain inorganic compounds such as talc or clay. For example, the nucleating agent may consist of inorganic compounds such as talc or clay containing kaolin and bentonite. The nucleating agent may be present in the composition in an amount of at least about 0.01 wt%, for example at least about 0.05 wt%, for example at least about 0.1 wt%, and less than about 2 wt%, for example less than about 1.5 wt%, for example less than 1 wt%, where the weight is based on the total weight of each polymer composition.

[0041]

[0042] In one embodiment, antioxidants such as sterically hindered phenols may be present. Commercial products Examples include pentaerythrityltetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010) and triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] (antioxidant 245). The antioxidant may be present in the polymer composition in amounts of at least about 0.01 wt%, e.g., at least about 0.05 wt%, e.g., at least about 0.075 wt%, and less than about 1 wt%, e.g., less than about 0.75 wt%, e.g., less than about 0.5 wt%, where the weight is based on the total weight of each polymer composition.

[0042]

[0043] In one embodiment, a UV stabilizer may exist. The UV stabilizer is benzopheno The UV light absorber may contain benzotriazole or benzoate. If present, the UV light absorber may be present in the polymer composition in an amount of at least about 0.01 wt%, e.g., at least about 0.05 wt%, e.g., at least about 0.075 wt%, and less than about 1 wt%, e.g., less than about 0.75 wt%, e.g., less than about 0.5 wt%, where weight is based on the total weight of each polymer composition. In some examples, the UV light absorber does not contain butanediic acid or its polymers, but in other examples, it may contain, for example, oligomeric hindered amine light stabilizers (HALS), e.g., dimethyl butanediic acid polymer with 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol.

[0043]

[0044] In one embodiment, in addition to the UV stabilizer, a light stabilizer such as a sterically hindered amine is present. This may also be done. Usable hindered amine light stabilizers include N-methylated oligomeric hindered amine compounds. For example, hindered amine light stabilizers may include high molecular weight hindered amine stabilizers. Other embodiments of light stabilizers include 2,2,6,6-tetramethyl-4-piperidyl compounds, such as bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate (sebacic acid) or polymers of dimethyl succinate and 1-(2-hydroxyethyl)-4-hydroxy-2,2,6,6-tetramethyl-4-piperidine. In one embodiment, the light stabilizer is 2-(2H-benzotriazole-2-yl) 4 It may contain ,6-bis(1-ethyl-1-phenylethyl)phenol. If present, the light stabilizer may be present in the polymer composition in an amount of at least about 0.01 wt%, e.g., at least about 0.05 wt%, e.g., at least about 0.075 wt%, and less than about 1 wt%, e.g., less than about 0.75 wt%, e.g., less than about 0.5 wt%, where the weight is based on the total weight of each polymer composition.

[0044]

[0045] In one embodiment, a lubricant may be present. The lubricant is added to the composition for various reasons. Lubricants can, for example, facilitate the molding process and / or the removal of the composition from the mold. Lubricants can also affect the viscosity of the composition when it is in a molten state. Furthermore, lubricants can be present to assist in the dispersion of various components in order to produce a homogeneous composition. For example, lubricants can act as dispersants in the dispersion of pigments and other colorants.

[0045]

[0046] The lubricant may include a polymer wax composition. In some examples, polyethylene The composition may contain one or more of the following: (e.g., polyethylene glycol), wax (e.g., paraffin, polar polyethylene wax, or montan wax), fatty acids (e.g., stearic acid), oleic acid (e.g., talc), silicones (e.g., polydimethylsiloxane), and metal soaps. The polyethylene glycol may have a molecular weight of, for example, about 1000 to about 5000, for example, about 3000 to about 4000. In one embodiment, for example, PEG-35 or PEG-70 may be present. In another embodiment, fatty acid amides such as ethylenebis(stearamide) may be present. In yet another embodiment, the POM composition may not contain certain stearates such as magnesium stearate (however, magnesium stearate may be present in some embodiments). In another example, the composition may contain The polyethylene wax (polar or nonpolar) for use may contain or consist of high-density, high-molecular-weight polyethylene oxide homopolymer. In some examples, the POM composition may not contain nonpolar polyethylene wax. In some embodiments, a solid lubricant such as hexagonal boron nitride may be included, but in other embodiments, the solid lubricant may not be included. In some embodiments, pentaerythritol ester (e.g., with stearic acid) may be included, but in other embodiments, the pentaerythritol ester may not be included.

[0046]

[0047] Other lubricating additives can be supplied in masterbatch form. For example, A siloxane polymer (e.g., ultra-high molecular weight (UHMW) siloxane) dispersed in rioxymethylene can be incorporated as a lubricant. In other embodiments, the UHMW siloxane may be omitted.

[0047]

[0048] Lubricants are generally present in polymer compositions at least about 0.01 wt%, for example It may be present in an amount of at least about 0.05 wt%, for example at least about 0.075 wt%, and less than about 1 wt%, for example less than about 0.75 wt%, for example less than about 0.5 wt%, where the weight is based on the total weight of each polymer composition.

[0048]

[0049] In one aspect, a polymer composition and an article manufactured from the composition have a natural color. It may be present. Alternatively, a colorant may be present. As described above, one or more colorants may be combined with a lubricant to disperse the colorant throughout the composition. Possible colorants include any desired inorganic pigment, e.g., titanium dioxide, ultramarine blue, cobalt blue, and other organic pigments and dyes, e.g., phthalocyanine, anthraquinone. In some examples, the POM composition may contain one or more of the following: fluorescent whitening agent 184, pigment orange 68, pigment red 247, pigment green 7, pigment blue 15, quinacridone red, pigment violet 23, pigment brown 24, and pigment red 122. Other colorants include carbon black or various other polymer-soluble dyes. In one embodiment, a combination of colorants may be included in the polymer composition.

[0049]

[0050] In some cases, the POM composition contains various pigments, such as iron oxide and hydroxyl Iron pigments (e.g., Bayferrox 110M, 120M, 3910, Colortherm Red 130M / 160M / 180M; e.g., particle size 0.1μm to 1μm (in 0.1μm increments)), Pigment Red 101, Pigment Red 254, Pigment Yellow 180, chinophthalone pigments, nitrogen-based pigments (e.g., Ni / Sb / Ti oxide pigments), and sulfur-based pigments (e.g., sodium aluminosulfur The pigment may not contain any posilicate at all. Naturally, the aforementioned pigments, which may be excluded, may be included in certain forms.

[0050]

[0051] Heliogen Blue K 7090 is a pigment blue 15 or non This is a representative example of chlorinated copper phthalocyanine (beta form with a copper content of approximately 11 wt%). Unavoidable impurities are kept below 20 ppm for antimony, arsenic, lead, cadmium, chromium, chromium, selenium, mercury, and zinc. Any primary aromatic amines are also kept below 100 ppm.

[0051]

[0052] Sicotan Yellow K 2112 is a representative rutile pigment based on chromium(III) oxide, antimony pentoxide, and titanium dioxide. Any acid-soluble antimony is present in amounts of less than approximately 20 ppm. In addition, unavoidable impurities include arsenic (30 ppm), lead (50 ppm), cadmium (less than 10 ppm), cobalt (less than 10 ppm), and copper (10 ppm). The levels are kept below 50 ppm for nickel, below 1 ppm for selenium, below 1 ppm for mercury, and below 100 ppm for zinc. Another example is Titanorange 6994.

[0052]

[0053] Printex FP is a representative of carbon black or pigment black 7. That is the case.

[0054] Kronos 2220 and 2233 are rutile produced by the chloride process. Representative pigments and representative R2 compounds corresponding to DIN EN ISO 591 Part 1 contain a minimum of 95.5, 92.5, and 96 wt% TiO2, respectively, and are stabilized with aluminum, aluminum and silicon, and aluminum and silicon-containing compounds, respectively. The dispersibility of plastisols containing the same can be approximately 99 and 104, respectively. Various grades of titanium dioxide can be used depending on the target design requirements. For example, Kronos 2233 is a titanium dioxide that exhibits resistance to the degradation of the carrier polymer and maintains its coloring effect even at high processing temperatures.

[0053]

[0055] PV Fast Green GNX is Pigment Green 7 (Copper Phthalool). Anin is the representative.

[0056] PV Fast Red E5B is pigment violet 19 or quinac He is the representative of Lidon Red.

[0054]

[0057] Heliogen Green K 8730 is Pigment Green 7 or This is a representative example of chlorinated copper phthalocyanine (copper content approximately 5.6 wt%). Unavoidable impurities are kept below 20 ppm for antimony, arsenic, lead, cadmium, chromium, chromium, selenium, mercury, and zinc. Any primary aromatic amines are also kept below 100 ppm.

[0055]

[0058] The coloring agent is present in the composition at least about 0.01 wt%, for example, at least about 0 It may be present in amounts of 0.05 wt%, for example, at least about 0.1 wt%, for example, at least about 0.5 wt%, for example, at least about 0.8 wt%, for example, at least about 1 wt%, and less than about 5 wt%, for example, less than about 2.5 wt%, for example, less than about 1 wt%, where the weight is based on the total weight of each polymer composition.

[0056]

[0059] In one embodiment, one or more colorants are composed together with a lubricant that acts as a dispersant. It can be added to a substance. In one embodiment, the lubricant may include a polyolefin such as polyethylene wax. In one special embodiment, the dispersant includes polyethylene wax having a medium molecular weight. The molecular weight of polyethylene is generally less than about 10,000 g / mol, for example less than about 8,000 g / mol, for example less than about 6,000 g / mol, for example less than 4,000 g / mol, and generally greater than about 500 g / mol, for example greater than about 1,000 g / mol. The polyethylene wax has a molecular weight of about 0.9 g / cm³. 3 ~Approx. 0.95g / cm 3 For example, approximately 0.92 g / cm³ 3 ~Approx. 0.94g / cm 3It may have a density of [value missing]. The density can be measured according to ISO test 1183.

[0057]

[0060] The polyethylene dispersant can be pre-mixed with one or more colorants. Alternatively, Dispersants may be added to the polymer composition together with colorants. In one embodiment, the polyethylene wax has a fine grain structure and may have a particle size generally less than about 2,000 microns and generally greater than about 500 microns. If present, dispersants (or lubricants) may be included in the polymer composition in an amount generally greater than about 0.0001% by weight, for example greater than about 0.001% by weight, and generally less than about 2% by weight, for example less than about 1% by weight. Dispersants may be present with one or more colorants in a weight ratio of about 50:1 to about 1:10, for example about 10:1 to about 1:5, for example about 5:1 to about 1:1.

[0058]

[0061] The fillers that may be included in the composition are glass beads, wollastonite, loam, and molybdenum disulfide. Density or graphite, and / or inorganic or organic fibers, etc.

[0062] The reinforcing fillers that can be used in the composition include inorganic fibers such as glass fibers. The fibers may be modified or unmodified, for example, by being sized or chemically treated to improve adhesion to the polymer. Glass fibers are particularly preferred. In some cases, zinc oxide, such as activated zinc oxide, may be used as a filler in the composition, but in other cases, the composition may not contain zinc oxide.

[0059]

[0063] The glass fibers are sized to protect them and allow the fibers to slide. In addition to making it easier to work with, it also improves the adhesion between the fibers and the matrix material. Sizing typically includes silane, film-forming agents, lubricants, wetting agents, adhesives, optionally antistatic and plasticizers, emulsifiers, and optionally further additives.

[0060]

[0064] The composition may optionally contain ethoxylated amines and polyoxyethylene alkylamines. The composition may contain a special antistatic agent including a fatty acid ester, but it does not have to contain the aforementioned antistatic agent.

[0061]

[0065] A specific example of a silane is aminosilane, for example, 3-trimethoxysilylpropyl These are amines, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(3-trimethoxysilanylpropyl)ethane-1,2-diamine, 3-(2-aminoethyl-amino)propyltrimethoxysilane, and N-[3-(trimethoxysilyl)propyl]-1,2-ethane-diamine.

[0062]

[0066] Examples of film-forming agents include polyvinyl acetate, polyester, and polyurethane. It is.

[0067] The reinforcing fibers are processed, for example, in an extruder or kneader using a polyoxymethylene matrix. It can be incorporated into the material. However, the reinforcing fibers are continuous fibers coated or impregnated with a polyoxymethylene molding composition in a manner appropriate for this purpose. It is also beneficial to use filament fibers, which can then be processed or wound into continuous strands, or cut to desired pellet lengths such that the fiber length and pellet length are the same. A particularly suitable method for this purpose is the pultrusion method.

[0063]

[0068] The reinforcing fibers are present in the molding composition in an area of ​​5 to 45 wt%, for example, 10 to 40 wt%. It can exist in a certain quantity. Here, the weight is based on the total weight of the composition.

[0069] The polymer composition may contain a triboadditive, for example, polytetrafluoroethylene (PTFE). However, in some cases, the composition may not contain PTFE.

[0064]

[0070] The polymer composition further includes impact-resistant modifiers such as thermoplastic elastomers. It may be so. Thermoplastic elastomers are materials that possess both thermoplastic and elastomeric properties. Examples of thermoplastic elastomers include styrene-based block copolymers, polyolefin blends called thermoplastic olefin elastomers, elastomer alloys, thermoplastic polyurethanes, thermoplastic copolyesters, and thermoplastic polyamides.

[0065]

[0071] Thermoplastic elastomers well suited for use in this disclosure include polyester elastomers. These include tomer (TPE-E), thermoplastic polyamide elastomer (TPE-A), and especially thermoplastic polyurethane elastomer (TPE-U).

[0066]

[0072] In one particular embodiment, a thermoplastic polyurethane elastomer is used. Thermoplastic polyurethane elastomers may have, for example, a soft segment of a long-chain diol and a hard segment derived from a diisocyanate and a chain extender. In one embodiment, the polyurethane elastomer is of the polyester type, produced by reacting a long-chain diol with a diisocyanate to produce a polyurethane prepolymer having isocyanate end groups, and then chain-extending the prepolymer using a diol chain extender. Typical long-chain diols are polyester diols such as poly(butylene adipate)diol, poly(ethylene adipate)diol and poly(ε-caprolactone)diol; and polyether diols such as poly(tetramethylene ether) glycol, poly(propylene oxide) glycol, poly(ethylene oxide) glycol, polycarbonate diol and / or polyester polycarbonate diol. Suitable diisocyanates include 4,4'-methylenebis(phenyl isocyanate) and 2,4-toluenediol. Socyanates, 1,6-hexamethylene diisocyanate and 4,4'-methylenebis( Examples include cyclooxyl isocyanates. Suitable chain extenders are C2-C6 aliphatic diols such as ethylene glycol, 1,4-butanediol, 1,6-hexanediol, and neopentyl glycol. An example of a thermoplastic polyurethane is essentially characterized as poly(adipic acid-cobutylene glycol-co-diphenylmethane diisocyanate).

[0067]

[0073] The amount of thermoplastic elastomer contained in the polymer composition depends on various factors. The amount can vary. For example, thermoplastic elastomers may be present in amounts ranging from about 0.5% by weight to about 50% by weight. In one embodiment, for example, thermoplastic elastomers or impact modifiers may be present in the composition in amounts less than about 25% by weight, for example less than about 15% by weight, for example less than 10% by weight. Generally, thermoplastic elastomers or impact modifiers are present in amounts greater than about 2% by weight, for example greater than about 5% by weight, for example greater than about 8% by weight, for example greater than 10% by weight.

[0068]

[0074] The compositions disclosed herein are formulated and polymerized using any technique known in the art. - The mixture can be molded into a product. For example, each composition can be vigorously mixed to form a substantially homogeneous blend. The blend can be melt-kneaded at a high temperature, for example, a temperature higher than the melting point of the polymer used in the polymer composition but lower than the decomposition temperature. Alternatively, each composition may be melted and mixed together in a conventional single-screw or twin-screw extruder. Preferably, the melt-mixing is carried out at a temperature in the range of 100 to 280°C, for example, 120 to 260°C, for example, 140 to 240°C or 180 to 220°C.

[0069]

[0075] After extrusion, the composition can be formed into pellets. The pellets can be manufactured by injection molding, thermoforming, Polymer products can be molded using techniques known in the relevant field, such as blow molding and rotational molding.

[0070]

[0076] Generally, polymer compositions produced in accordance with this disclosure have good formaldehyde content. Formaldehyde emission and elution performance can be demonstrated. For example, in some embodiments, formaldehyde emission by VDA-275 may be less than about 15 ppm, e.g., less than about 12 ppm, e.g., less than about 10 ppm, e.g., less than about 8 ppm, e.g., less than about 6 ppm, e.g., less than 5 ppm. Emissions may generally be greater than about 0.01 ppm, e.g., greater than about 0.5 ppm.

[0071]

[0077] The possibility of formaldehyde leaching from GB4806.6-2016 is present in some states. In any measurement medium, including measurements taken in water at 40°C for 10 days, measurements taken in water at 100°C for 30 minutes, measurements taken in 10% ethanol at 40°C for 10 days, and measurements taken in oil at 40°C for 10 days, the concentration was less than approximately 15 ppm, for example less than approximately 12 ppm, for example less than approximately 10 ppm, for example less than approximately 8 ppm, for example less than approximately 6 ppm, for example approximately 4 The concentration may be less than ppm. The elution potential in any medium may be below the detection limit, for example, less than about 0.3 ppm. In other embodiments, the elution potential may be detectable (for example, higher than about 0.3 ppm, and higher than about 1 ppm).

[0072]

[0078] The elution potential of trioxymethylene and 1,3-dioxolane is as follows under the same conditions. If measured, the concentration may be less than approximately 5 ppm, e.g., less than approximately 4 ppm, e.g., less than approximately 3 ppm, e.g., less than approximately 2 ppm, e.g., less than approximately 1 ppm, e.g., less than approximately 0.5 ppm, e.g., less than approximately 0.25 ppm, e.g., less than approximately 0.1 ppm. The elution potential in any medium may be below the detection limit, e.g., less than approximately 0.05 ppm. In other embodiments, the elution potential may be detectable (e.g., higher than approximately 0.05 ppm, e.g., higher than approximately 0.075 ppm).

[0073]

[0079] Polyoxymethylene polymer compositions and polymers produced therefrom (as disclosed herein) While the product offers improved release properties, the composition and product can also exhibit excellent mechanical properties (ISO Test 527). For example, when tested according to ISO Test No. 527, the polymer composition may have a tensile modulus higher than approximately 1,200 MPa, for example, higher than approximately 2,000 MPa. The tensile modulus is generally less than approximately 10,000 MPa.

[0074]

[0080] The polymer composition has a load of approximately 3 kJ / m³ at 23°C. 2 Larger, for example, about 5 kJ / m³ 2 Notched Charpy impact strength can be greater (ISO test 179-1). Notched Charpy impact strength is generally about 20 kJ / m². 2 It is less than.

[0075]

[0081] The polymer composition has a load of approximately 3 kJ / m³ at -30°C. 2 Larger, for example, about 5kJ / m 2 It can exhibit a higher notched Charpy impact strength. The notched Charpy impact strength at -30°C is generally about 20 kJ / m². 2 It is less than.

[0076]

[0082] The polymer compositions disclosed herein can be used to manufacture various molded parts. Yes, it is possible. The parts can be formed by any suitable molding method, such as injection molding or blow molding. Polymer products that can be manufactured according to this disclosure include, without limitation, knobs, door handles, and decorative trim pieces for automobiles. Other polymer products that can be manufactured according to this disclosure include latches, levers, gears, pivot housings, and speaker grilles.

[0077]

[0083] In one particular embodiment, the polymer composition is as shown in Figure 1. - Used in the manufacture of coffee maker 10. Coffee makers are designed to heat liquids very rapidly and produce heated beverages. As a result, the operating environment of the coffee maker, particularly the internal operating environment, can change relatively quickly from room temperature to high temperature. Coffee makers, such as coffee maker 10 shown in Figure 1, also have numerous parts. In accordance with this disclosure, various internal and external parts of a coffee maker, particularly those exposed to high-temperature water, can be manufactured from the polymer compositions of this disclosure.

[0078]

[0084] Coffee brewing equipment typically includes a water heating unit and a coffee supply unit. Includes the brewing assembly. To produce a heated beverage, the coffee is brewed. - Hot water is supplied to the leaching assembly from the heat supply unit, and hot water is supplied from the water heating unit. A typical leaching assembly includes a leaching head, an upper closure element, a lower closure element, and at least one linear guide element.

[0079]

[0085] Referring to Figure 2, the coffee maker 10 consists of a first member 22 and a second member 2 4 may include. The first member 22 and the second member 24 may, in one embodiment, be parts of an extraction assembly or parts of a coffee supply unit. For example, members 22 and 24 may be used to receive coffee and place it in a designated area such as a capsule in order to produce a coffee beverage. Because they are in close proximity to hot water, components 22 and 24 can experience operating environments far exceeding 30°C, for example, higher than 40°C, for example higher than 50°C, and even higher than 60°C. Benefitingly, components containing compositions manufactured according to this disclosure can exhibit low formaldehyde emissions and elution even when exposed to high-temperature water.

[0080]

[0086] As mentioned above, in one embodiment, the formaldehyde stabilizer package is gua The composition does not contain guanamine compounds, hydantoins, substituted hydantoins, amino acids, and / or ethyleneurea. Compositions that do not contain guanamine are particularly well suited for the manufacture of medical products. For example, referring to Figure 3, an inhaler 30 is shown. The inhaler 30 includes a housing 32 attached to a mouthpiece 34. Operatingly related to the housing 32 is a plunger 36 for receiving a canister containing the composition to be inhaled. The composition may include a spray or a powder.

[0081]

[0087] During use, the inhaler 30 administers a measured dose of medication, such as asthma medication, to the patient. The asthma medication may be suspended or dissolved in the propellant or contained in a powder. When the patient activates the inhaler to inhale the medication, a valve opens, allowing the medication to be dispensed from the mouthpiece. In accordance with this disclosure, the housing 32, mouthpiece 34, and plunger 36 can all be manufactured from the polymer composition described above.

[0082]

[0088] Referring to Figure 4, another medical product that can be manufactured in accordance with this disclosure is shown. Figure 4 shows a medical syringe 40. The medical syringe 40 includes a plunger 44 and a housing 42 that is operationally associated with it. The housing 42 can slide relative to the plunger 44. The medical syringe 40 may be spring-operated. The medical syringe is for injecting drugs into a patient, typically into the thigh or buttocks. The medical syringe may be needleless or contain a needle. If it contains a needle, the needle tip is typically shielded within the housing before injection. On the other hand, a needleless syringe may contain a cylinder of pressurized gas that propels the drug through the skin without using a needle. In accordance with this disclosure, the housing 42 and / or the plunger 44 can be manufactured from the polymer composition described above.

[0083]

[0089] In one embodiment, polymer products manufactured in accordance with this disclosure are conveyor systems It can be used to manufacture parts of a system. A conveyor system typically includes, for example, a conveyor chain that moves on a track. Such a conveyor system can be used to move all different kinds of products and articles. In one aspect, for example, such a conveyor is used for transporting food.

[0084]

[0090] Referring to Figure 5, for example, one aspect of a part of the conveyor chain 50 is shown. As shown, the conveyor chain 50 is made up of a plurality of conveyor components 52 or links. Each of the conveyor components 52 includes an upper surface for receiving and transporting food. In accordance with this disclosure, the conveyor components 52 can be manufactured from the polymer compositions of this disclosure. Particularly beneficial, the conveyor components 52 may include one or more colorants to provide the component with a desired surface appearance. Beneficially, components containing compositions manufactured in accordance with this disclosure can exhibit low formaldehyde emissions and leaching even when exposed to harsh cleaning conditions.

[0085]

[0091] In yet another aspect of this disclosure, a polymer composition is coated with a metal Cosmetic closures can be manufactured. For example, Figure 6 shows one embodiment of a cosmetic closure 60 that can be manufactured according to this disclosure.

[0086]

[0092] The above disclosure can be better understood by considering the following embodiments. cormorant. [Examples]

[0087]

[0093] A polymer composition (Sample 1) is manufactured in accordance with this disclosure and contains the following components. They were doing it. 99.33 wt% Polyoxymethylene (MFI: 8.5 cm) 3 / 10 minutes), 0.30 wt% triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], 0.20 wt% ethylenebis(stearamide), 0.07 wt% calcium 12-hydroxystearate, and 0.10 wt% talc

[0094] The following mechanical properties were obtained for Sample 1.

[0088] Tensile modulus: 2640 MPa Yield strength: 63.5 MPa Yield strain: 10.5% Breaking stress: 54 MPa Destructive distortion: 34% Notched Charpy ray (room temperature): 5.8 kJ / m 2 Notched Charpy nozzle (-30℃): 5.5 kJ / m 2

[0095] Sample 1 was injected for formaldehyde emission testing using VDA-275. The material was extruded and molded into 80mm x 50mm x 1mm plaque. The following emission results were obtained.

[0089] VDA-275: 9.5 ppm

[0096] The boards manufactured as described above were subjected to a formaldehyde elution test (here, "formaldehyde"). It was subjected to a Formaldehyde Extraction Test (also known as the Formaldehyde Extraction Test). In particular, approximately 160 cm 2 Two plates with a total surface area were immersed in a 240 mL water bath at 80°C (±10°C) for 30 minutes. After 30 minutes, the plates were immediately removed from the bath, and the bath water was cooled to room temperature in the same sealed (lidded) container used for the bath. After homogenizing the aqueous solution, the formaldehyde content was determined by spectrophotometric analysis using the lutidine method (compared to a reference solution without the sample). The elutable formaldehyde content was determined by multiplying the absorbance of the solution measured by the spectrophotometer by a calculation factor of 1.5. The following elutable contents were measured.

[0090] Eluable formaldehyde: 2.7 μg / cm³ 2

[0097] Migration tests of trioxymethylene and 1,3-dioxolane were performed using HS-GC-MS. Therefore, the experiment was conducted. All transition tests were carried out according to GB4806.6-2016, Method 1. The calculation was performed using an area-to-volume ratio of 6 dm². 2 The test was conducted using 1 L (kg). The test results are reported below.

[0091] [Table 1]

[0092]

[0098] These and other modifications and variations of the present invention are further described in the claims. Those skilled in the art can implement the invention without departing from the spirit and scope of the invention as detailed in detail. Furthermore, it should be understood that aspects of the various embodiments are interchangeable in whole or in part. Moreover, those skilled in the art will understand that the above description is merely illustrative and is not intended to limit the invention as detailed in the appended claims. The following is the description of the claims as they were at the time of filing the application. [Claim 1] A polymer composition, It is present in the polymer composition in an amount exceeding approximately 60% by weight, and when tested at a temperature of 190°C and a load of 2.16 kg, it yields approximately 1 cm³. 3 / 10 minutes ~ approx. 80cm 3 A polyoxymethylene polymer having a melt volume flow rate of / 10 minutes; Inorganic nucleating agents and; Antioxidants and Includes, The polymer composition does not contain guanamine, urea, or melamine formaldehyde scavenger, but exhibits formaldehyde emission of less than approximately 15 ppm when tested according to VDA Test 275, and shows a formaldehyde elution content of less than 15 ppm when tested in water at a temperature of 40°C for 10 days according to the formaldehyde elution test. The aforementioned polymer composition. [Claim 2] The polymer composition according to claim 1, which is free of all formaldehyde scavengers. [Claim 3] The polymer composition according to claim 1 or 2, wherein the inorganic nucleating agent contains talc, and the talc is present in the polymer composition in an amount of about 0.01% to about 1% by weight. [Claim 4] The polymer composition according to any one of claims 1 to 3, further comprising an acid scavenger, wherein the acid scavenger comprises a carboxylate salt. [Claim 5] The polymer composition according to claim 4, wherein the carboxylate salt comprises an alkaline earth metal salt of a carboxylic acid. [Claim 6] The polymer composition according to claim 5, wherein the acid scavenger comprises calcium hydroxystearate, and the acid scavenger is present in the polymer composition in an amount of about 0.01% to about 1% by weight. [Claim 7] A polymer composition according to any one of claims 1 to 6, which does not contain a polymer nucleating agent. [Claim 8] A polymer composition according to any one of claims 1 to 7, having an elutable formaldehyde content of less than approximately 8 ppm, for example, less than approximately 5 ppm, when tested in water at 40°C for 10 days. [Claim 9] The polymer composition according to any one of claims 1 to 8, further containing a lubricant. [Claim 10] The polymer composition according to claim 9, wherein the lubricant comprises ethylenebis(stearamide), and the ethylenebis(stearamide) is present in the polymer composition in an amount of about 0.01% to about 1% by weight. [Claim 11] The polymer composition according to claim 10, wherein ethylenebis(stearamide) is of plant origin. [Claim 12] A polymer composition according to any one of claims 1 to 11, further comprising one or more colorants. [Claim 13] The polymer composition according to claim 12, wherein one or more colorants are present in the polymer composition together with a dispersant. [Claim 14] The polymer composition according to claim 13, wherein the dispersant comprises a polyethylene polymer, the polyethylene polymer having a molecular weight of about 500 g / mol to about 10,000 g / mol, and the polyethylene polymer is nonpolar. [Claim 15] The dispersant is approximately 0.92 g / cm³. 3 ~Approx. 0.94g / cm 3 A polymer composition according to claim 13 or 14, comprising a polymer having a density of . [Claim 16] The polymer composition according to any one of claims 1 to 15, further comprising a lubricant. [Claim 17] The polymer composition according to claim 16, wherein the lubricant comprises polytetrafluoroethylene, ultra-high molecular weight silicone, silicone oil, or wax. [Claim 18] A polymer composition according to any one of claims 1 to 17, further containing glass fibers. [Claim 19] A polymer composition according to any one of claims 1 to 18, further comprising a thermoplastic elastomer. [Claim 20] The polymer composition according to claim 19, wherein the thermoplastic elastomer comprises a thermoplastic polyurethane elastomer. [Claim 21] The polymer composition according to claim 2, wherein the inorganic nucleating agent comprises talc, the talc present in the polymer composition in an amount of about 0.1% to about 1% by weight, the polymer composition further comprises an acid scavenger comprising calcium hydroxystearate, the calcium hydroxystearate present in the polymer composition in an amount of about 0.01% to about 1% by weight, the polymer composition further comprises ethylenebis(stearamide), and the polymer composition does not contain a polymer nucleating agent. [Claim 22] Polyoxymethylene polymer is present in the polymer composition in an amount exceeding approximately 90% by weight. The polymer composition according to claim 21. [Claim 23] A molded article manufactured from a polymer composition according to any one of claims 1 to 22. [Claim 24] A molded article according to claim 23, which includes parts for household appliances. [Claim 25] A molded article according to claim 23, including a conveyor component. [Claim 26] A molded article according to claim 23, including a component of a medical product. [Explanation of Symbols]

[0093] 10 Coffee Makers 22 First component 24 Second component 30 Inhaler 32 Housing 34 mouthpieces 36 Plungers 40 Medical syringes 42 Housing 44 plungers 50 Conveyor Chains 52 Conveyor parts 60 Cosmetic containers

Claims

1. A polymer composition for food contact applications, If present in the polymer composition in an amount exceeding 60% by weight, and tested at a temperature of 190°C and a load of 2.16 kg, then 1 cm ３ / 10 minutes to 80cm ３ / A polyoxymethylene polymer having a melt volume flow rate of 10 minutes; A lubricant comprising ethylenebis(stearamide), wherein the ethylenebis(stearamide) is present in the polymer composition in an amount of 0.01% to 1% by weight, and the ethylenebis(stearamide) is of plant origin; Acid scavengers containing carboxylates; Antioxidants and Includes, The polymer composition does not contain guanamine, urea, or melamine formaldehyde scavenger, but exhibits formaldehyde emission of less than 15 ppm when tested according to VDA Test 275, and exhibits a formaldehyde elution content of less than 15 ppm when tested in water at a temperature of 40°C for 10 days according to the formaldehyde elution test. The aforementioned polymer composition.

2. The polymer composition according to claim 1, which is free of all formaldehyde scavengers.

3. The polymer composition according to claim 1, wherein the carboxylate contains tricalcium citrate, and the carboxylate is present in the polymer composition in an amount greater than 0.01% by weight and less than 1% by weight.

4. The polymer composition according to claim 1, wherein the carboxylate salt comprises calcium hydroxystearate, and the carboxylate salt is present in the polymer composition in an amount of 0.01% to 1% by weight.

5. A polymer composition according to any one of claims 1 to 4, which does not contain a polymer nucleating agent.

6. A polymer composition according to any one of claims 1 to 5, having an elutable formaldehyde content of less than 8 ppm when tested in water at 40°C for 10 days.

7. The polymer composition according to claim 6, having an elutable formaldehyde content of less than 5 ppm when tested in water at 40°C for 10 days.

8. A polymer composition according to any one of claims 1 to 7, further comprising one or more colorants.

9. The polymer composition according to claim 8, wherein one or more of the colorants are present in the polymer composition together with a dispersant.

10. The polymer composition according to claim 9, wherein the dispersant comprises a polyethylene polymer, the polyethylene polymer having a molecular weight of 500 g / mol to 10,000 g / mol, and the polyethylene polymer is nonpolar.

11. The aforementioned dispersant is 0.92 g / cm³ ３ ~0.94 g / cm³ ３ A polymer composition according to claim 9 or 10, comprising a polymer having a density of .

12. The polymer composition according to claim 1, wherein the lubricant comprises polytetrafluoroethylene, ultra-high molecular weight silicone, silicone oil, or wax.

13. A polymer composition according to any one of claims 1 to 12, further containing glass fibers.

14. A polymer composition according to any one of claims 1 to 13, further comprising a thermoplastic elastomer.

15. The polymer composition according to claim 14, wherein the thermoplastic elastomer comprises a thermoplastic polyurethane elastomer.

16. A polymer composition according to claim 1, wherein the carboxylate salt comprises calcium hydroxystearate, and the calcium hydroxystearate is present in the polymer composition in an amount of 0.01% to 1% by weight. The polymer composition is the polymer composition which does not contain a polymer nucleating agent.

17. The polymer composition according to claim 16, wherein the polyoxymethylene polymer is present in the polymer composition in an amount exceeding 90% by weight.

18. The polymer composition according to claim 1, further containing an inorganic nucleating agent.

19. A molded article for food contact applications, manufactured from a polymer composition according to any one of claims 1 to 18.

20. A molded article according to claim 19, including parts for household appliances.

21. A molded article according to claim 19, including a conveyor component.

22. A molded article according to claim 19, which includes a component of a medical product.

Images