JPH07107117B2 - Polypropylene resin sheet for thermoformed food containers - Google Patents
Polypropylene resin sheet for thermoformed food containersInfo
- Publication number
- JPH07107117B2 JPH07107117B2 JP60227587A JP22758785A JPH07107117B2 JP H07107117 B2 JPH07107117 B2 JP H07107117B2 JP 60227587 A JP60227587 A JP 60227587A JP 22758785 A JP22758785 A JP 22758785A JP H07107117 B2 JPH07107117 B2 JP H07107117B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- polypropylene
- polypropylene resin
- parts
- resin sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- -1 Polypropylene Polymers 0.000 title claims description 40
- 239000004743 Polypropylene Substances 0.000 title claims description 28
- 229920001155 polypropylene Polymers 0.000 title claims description 28
- 235000013305 food Nutrition 0.000 title claims description 17
- 239000011347 resin Substances 0.000 title claims description 14
- 229920005989 resin Polymers 0.000 title claims description 14
- 239000003963 antioxidant agent Substances 0.000 claims description 18
- 239000004698 Polyethylene Substances 0.000 claims description 10
- 229920000573 polyethylene Polymers 0.000 claims description 10
- 239000011342 resin composition Substances 0.000 claims description 10
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical class OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 5
- 239000002530 phenolic antioxidant Substances 0.000 claims description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 2
- 230000003078 antioxidant effect Effects 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- 239000000796 flavoring agent Substances 0.000 description 6
- 235000019634 flavors Nutrition 0.000 description 6
- 238000003856 thermoforming Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920001400 block copolymer Polymers 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000007666 vacuum forming Methods 0.000 description 3
- RGASRBUYZODJTG-UHFFFAOYSA-N 1,1-bis(2,4-ditert-butylphenyl)-2,2-bis(hydroxymethyl)propane-1,3-diol dihydroxyphosphanyl dihydrogen phosphite Chemical compound OP(O)OP(O)O.C(C)(C)(C)C1=C(C=CC(=C1)C(C)(C)C)C(O)(C(CO)(CO)CO)C1=C(C=C(C=C1)C(C)(C)C)C(C)(C)C RGASRBUYZODJTG-UHFFFAOYSA-N 0.000 description 2
- ROHFBIREHKPELA-UHFFFAOYSA-N 2-[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]prop-2-enoic acid;methane Chemical compound C.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O.CC(C)(C)C1=CC(CC(=C)C(O)=O)=CC(C(C)(C)C)=C1O ROHFBIREHKPELA-UHFFFAOYSA-N 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 235000011850 desserts Nutrition 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WAOPGHCXGUXHKF-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)-1,1-diphenylpropane-1,3-diol dihydroxyphosphanyl dihydrogen phosphite Chemical compound OP(O)OP(O)O.C1(=CC=CC=C1)C(O)(C(CO)(CO)CO)C1=CC=CC=C1 WAOPGHCXGUXHKF-UHFFFAOYSA-N 0.000 description 1
- GXURZKWLMYOCDX-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)propane-1,3-diol;dihydroxyphosphanyl dihydrogen phosphite Chemical compound OP(O)OP(O)O.OCC(CO)(CO)CO GXURZKWLMYOCDX-UHFFFAOYSA-N 0.000 description 1
- SMNGQGWPUVVORF-UHFFFAOYSA-N 3,5-ditert-butyl-4-methylphenol Chemical compound CC1=C(C(C)(C)C)C=C(O)C=C1C(C)(C)C SMNGQGWPUVVORF-UHFFFAOYSA-N 0.000 description 1
- 239000004386 Erythritol Substances 0.000 description 1
- UNXHWFMMPAWVPI-UHFFFAOYSA-N Erythritol Natural products OCC(O)C(O)CO UNXHWFMMPAWVPI-UHFFFAOYSA-N 0.000 description 1
- RRFWWSOELBTKEK-UHFFFAOYSA-N P(O)(O)O.P(O)(O)O.C(CCCCCCCCCCCCCCCCC)C(O)(C(CO)(CO)CO)CCCCCCCCCCCCCCCCCC Chemical compound P(O)(O)O.P(O)(O)O.C(CCCCCCCCCCCCCCCCC)C(O)(C(CO)(CO)CO)CCCCCCCCCCCCCCCCCC RRFWWSOELBTKEK-UHFFFAOYSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229940009714 erythritol Drugs 0.000 description 1
- 235000019414 erythritol Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は熱成形用ポリプロピレン樹脂シートに関する。
更に詳しくは、成形時における溶融張力が高く、かつ臭
気、味覚等のフレーバー性の改良された食品容器に適し
た熱成形用樹脂シートに関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a polypropylene resin sheet for thermoforming.
More specifically, the present invention relates to a thermoforming resin sheet suitable for a food container having a high melt tension at the time of molding and having improved flavor properties such as odor and taste.
〈従来の技術〉 ポリプロピレンは加工性が良好なこと、柔軟性が優れて
いること、軟化点が高いこと、並びに剛性及び硬度が高
いことにより工業的に生産され、種々の形状に成型され
多くの用途分野で使用されている。そのひとつとしてフ
イルム状、シート状に成形加工されたものは真空成形、
圧空成形及び熱板加熱式圧空熱成形等によって二次成形
加工され各種容器等に広く用いられている。<Prior Art> Polypropylene is industrially produced due to its good workability, excellent flexibility, high softening point, and high rigidity and hardness, and it is molded into various shapes. Used in application fields. One of them is vacuum forming, which is formed into a film or sheet.
It is widely used for various containers by secondary forming by pressure forming and hot plate heating type pressure forming.
しかし、ポリプロピレンは溶融張力に劣るためシートを
真空成形、圧空成形、熱板加熱式圧空熱成形等によって
二次成形加工を行う場合、シート加熱時にシートのたれ
下がりが大きく成形品にしわや不均一な肉厚のものしか
得られないという欠点を有していた。However, since polypropylene has a poor melt tension, when the sheet is subjected to secondary forming processing such as vacuum forming, pressure forming, hot plate heating type pressure air thermoforming, etc., the sheet sags greatly when the sheet is heated, and the formed product has wrinkles and unevenness. It had the drawback that only thick walls could be obtained.
そのため、従来から上記欠点を改良する目的でポリプロ
ピレンにポリエチレンやエチレン−プロピレン共重合体
を配合する方法などが行なわれてきた（特開昭55−1084
33号公報、特開昭55−189445号公報、特開昭56−41237
号公報、特開昭58−93742号公報、特開昭58−185634号
公報等）。Therefore, conventionally, for the purpose of improving the above-mentioned drawbacks, a method of blending polyethylene or polyethylene or an ethylene-propylene copolymer with polypropylene has been carried out (JP-A-55-1084).
33, JP-A-55-189445, JP-A-56-41237
JP-A-58-93742, JP-A-58-185634, etc.).
しかし、かかる方法ではシート加熱時に溶融張力の改良
効果はまだ不充分であり、複雑な形状や深絞り形状、あ
るいは薄肉化した場合に熱成形性に問題点があった。However, in such a method, the effect of improving the melt tension at the time of heating the sheet is still inadequate, and there is a problem in the thermoformability when the sheet has a complicated shape, a deep drawing shape, or a thin wall.
更に、ポリプロピレンシートは熱成形法により二次成形
加工され、食品、冷菓、乳酸飲料等の食品包装容器、ト
レー類に汎く使用されているが、内容食品のフレーバー
性（臭気・味覚）を悪くするという問題点も有してい
た。Furthermore, polypropylene sheets are secondarily formed by thermoforming and are widely used for food packaging containers such as foods, frozen desserts and lactic acid beverages, and trays, but the flavor property (odor and taste) of the foods is deteriorated. There was also a problem of doing.
その主な原因は重合体に抗酸化剤として従来ブチルヒド
ロキシトルエン（BHT）がポリプロピレン樹脂に添加さ
れているが、シート成形時および二次成形加工時高温の
温熱下にさらされた時新たな異臭が発生し、内容食品に
その異臭が移行するためであると考えられる。Butyl hydroxytoluene (BHT) has been added to polypropylene resin as an antioxidant in the polymer. However, when it is exposed to high temperature heat during sheet molding and secondary molding, it gives off a new odor. It is considered that this is because the offensive odor is transferred to the content food.
尚、ポリプロピレンにジフェニルペンタエリスリトール
ジフォスファイトとフェノール系抗酸化剤を添加すると
高温加工中に重合体の分解が防止されることは公知であ
る（特開昭52−106879号公報）。It is well known that the addition of diphenylpentaerythritol diphosphite and a phenolic antioxidant to polypropylene prevents decomposition of the polymer during high temperature processing (JP-A-52-106879).
しかし、ポリプロピレン樹脂シートの物性や臭気改良に
関しては全く記載がなかった。However, there was no description about the physical properties and odor improvement of the polypropylene resin sheet.
〈発明が解決しようとする問題点〉 かかる現状に於て、本発明が解決すべき問題点、即ち本
考案の目的は、真空成形、圧空成形、熱板加熱式圧空成
形等の二次成形加工時における溶融張力が高く、かつ二
次成形加工で得られた食品包装容器、トレー類（以下、
食品容器と略記する。）のフレーバ性を改良した食品容
器用ポリプロピレン樹脂シートを提供することにある。<Problems to be Solved by the Invention> Under the present circumstances, there are problems to be solved by the present invention, that is, the object of the present invention is to perform a secondary forming process such as vacuum forming, pressure forming, hot plate pressure forming and the like. High melt tension at the time, and food packaging containers, trays (hereinafter,
Abbreviated as food container. ) The polypropylene resin sheet for food containers which improved the flavor property of this is provided.
＜問題点を解決する為の手段＞ 本発明は、ポリプロピレン70〜100重量％とポリエチレ
ン０〜30重量％からなる樹脂組成物100重量部に対し、 有機フォスファイト化合物から選らばれた１種又は２種
以上の酸化防止剤（以下「酸化防止剤Ａ」と称す。）0.
02〜0.5重量部 及び一般式（Ｉ） （但し、R1はメチル基またはｔ−ブチル基を、R2は炭素
数12〜18の直鎖又は分枝アルキル基を示す。）で表わさ
れる化合物又はテトラキス−〔メチレン−３−（3,5−
ジ−ｔ−ブチル−４−ヒドロキシフェニル）プロピオネ
−ト〕メタンから選ばれたフェノール系酸化防止剤（以
下「「酸化防止剤Ｂ」と称す。）0.02〜0.5重量部 を含有するポリプロピレン樹脂組成物を押出成形してな
ることを特徴とする熱成形食品容器用ポリプロピレン樹
脂シートであって、上記従来の問題点を解決するもので
ある。<Means for Solving Problems> The present invention relates to 100 parts by weight of a resin composition consisting of 70 to 100% by weight of polypropylene and 0 to 30% by weight of polyethylene, and one or two kinds selected from organic phosphite compounds. One or more antioxidants (hereinafter referred to as "antioxidant A") 0.
02-0.5 parts by weight and general formula (I) (However, R 1 represents a methyl group or a t-butyl group, and R 2 represents a linear or branched alkyl group having 12 to 18 carbon atoms.) Or tetrakis- [methylene-3- (3, 5-
Di-t-butyl-4-hydroxyphenyl) propionate] methane-based polypropylene resin composition containing 0.02 to 0.5 part by weight of a phenolic antioxidant (hereinafter referred to as "antioxidant B") A polypropylene resin sheet for a thermoformed food container, which is characterized by being extruded, and which solves the above-mentioned conventional problems.
以下本発明につき詳細に説明する。The present invention will be described in detail below.
本発明に使用するポリプロピレンはメルトインデックス
（MI）が0.1〜10g/10分、好ましくは0.2〜5g/10分であ
り、プロピレンのホモポリマー、α−オレフイン含量10
モル％以下のランダムコポリマー、エチレン含量20重量
％以下のブロックコポリマーやこれらの混合物などであ
る。The polypropylene used in the present invention has a melt index (MI) of 0.1 to 10 g / 10 minutes, preferably 0.2 to 5 g / 10 minutes, and a propylene homopolymer having an α-olefin content of 10%.
Examples thereof include a random copolymer having a mol% or less, a block copolymer having an ethylene content of 20 wt% or less, and a mixture thereof.
次にポリエチレンはMI0.1〜5g/10分、好ましくは0.2〜3
g/10分であり、密度が0.90〜0.97g/cm2のものであり、
低密度ポリエチレン、中密度ポリエチレン、高密度ポリ
エチレンやこれらの混合物が目的に応じて使い分けられ
る。Polyethylene is then MI 0.1-5 g / 10 min, preferably 0.2-3
g / 10 min, with a density of 0.90-0.97 g / cm 2 ,
Low-density polyethylene, medium-density polyethylene, high-density polyethylene or a mixture thereof can be used properly according to the purpose.
ポリプロピレンの配合割合はポリプロピレンとポリエチ
レンとの合計量に対して70〜100重量％、好ましくは80
〜95重量％である。ポリプロピレンの配合量が70重量％
未満では得られる樹脂組成物の剛性や耐熱性が低下する
ため不適当である。The proportion of polypropylene is 70 to 100% by weight, preferably 80, based on the total amount of polypropylene and polyethylene.
~ 95% by weight. 70% by weight of polypropylene
If it is less than the above range, the rigidity and heat resistance of the obtained resin composition are deteriorated, which is not suitable.
ポリエチレンの配合割合はポリプロピレンとポリエチレ
ンとの合計量に対して０〜30重量％、好ましくは５〜20
重量％である。The blending ratio of polyethylene is 0 to 30% by weight, preferably 5 to 20% with respect to the total amount of polypropylene and polyethylene.
% By weight.
冷凍食品用容器で、低温耐衝撃性が特に要求される分野
にはブロックコポリマーが単独で使用される場合もあ
る。In a frozen food container, the block copolymer may be used alone in a field where low temperature impact resistance is particularly required.
本発明において酸化防止剤の必須成分の１つである有機
フォスファイト化合物から選ばれた１種または２種以上
の酸化防止剤Ａとしては、トリス−（モノ−ジ−ノリル
フェニル）フォスファイト、ジステアリル−ペンタエリ
スリトール−ジ−フォスファイト、4,4′−ブチリデン
−ビス（３−メチル−６−ｔ−ブチル−フェニル−ジド
デシル）フォスファイト、トリス（2,4−ジ−ｔ−ブチ
ルフェニル）フォスファイトなどが例示されるが、特に
一般式（II）で示される （上式中、R3は第３ブチル基または第３アミル基を示
す。R4は水素原子、メチル基、第３ブチル基、第３アミ
ル基、フェニル基またはシクロヘキシル基を示す。R5は
水素原子、メチル基または第３ブチル基を示す。R6は水
素原子またはメチル基を示す。ただしR4，R5及びR6が全
て同時に水素原子を示すことはない。） 特定のジアリール−ペンタエリスリトールジフォスファ
イト化合物が好ましい。その中でも特にビス（2,4−ジ
−ｔ−ブチルフェニル）ペンタエリスリトール−ジフォ
スファイトが好ましい。In the present invention, one or more antioxidants A selected from organic phosphite compounds, which are one of the essential components of the antioxidant, include tris- (mono-di-nolylphenyl) phosphite, di- Stearyl-pentaerythritol-di-phosphite, 4,4'-butylidene-bis (3-methyl-6-t-butyl-phenyl-didodecyl) phosphite, tris (2,4-di-t-butylphenyl) phosphite Examples thereof include fight, but particularly represented by the general formula (II) (In the above formula, R 3 represents a tertiary butyl group or a tertiary amyl group. R 4 represents a hydrogen atom, a methyl group, a tertiary butyl group, a tertiary amyl group, a phenyl group or a cyclohexyl group. R 5 represents A hydrogen atom, a methyl group or a tert-butyl group, R 6 represents a hydrogen atom or a methyl group, provided that R 4 , R 5 and R 6 do not all simultaneously represent a hydrogen atom. Erythritol diphosphite compounds are preferred. Among them, bis (2,4-di-t-butylphenyl) pentaerythritol-diphosphite is particularly preferable.
酸化防止剤Ａの添加量はポリプロピレンとポリエチレン
からなる樹脂組成物100重量部に対し、0.02〜0.5重量
部、好ましくは0.03〜0.3重量部である。添加量が0.02
重量部以下では溶融張力とフレーバー性の改良効果が小
さく、0.5重量部以上では改良効果は頭打ちであり、プ
リード等の問題が新たに生じる。The amount of the antioxidant A added is 0.02 to 0.5 part by weight, preferably 0.03 to 0.3 part by weight, based on 100 parts by weight of the resin composition comprising polypropylene and polyethylene. Addition amount is 0.02
If the amount is less than 5 parts by weight, the effect of improving the melt tension and the flavor property is small, and if the amount is more than 0.5 part by weight, the effect of the improvement is at a level, and problems such as bleeding newly occur.
本発明の効果を発揮するためのもう１つの必須成分は、
一般式（Ｉ） （たゞし、R1はメチル基またはｔ−ブチル基を、R2は炭
素数12〜18の直鎖または分枝アルキル基を示す。）で示
される化合物またはテトラキス−〔メチレン−３−（3,
5−ジ−ｔ−ブチル−４−ヒドロキシフェニル）プロピ
オネ−ト〕メタンから選ばれたフェノール系酸化防止剤
（酸化防止剤Ｂ）である。Another essential component for exerting the effect of the present invention is
General formula (I) (However, R 1 represents a methyl group or a t-butyl group, and R 2 represents a linear or branched alkyl group having 12 to 18 carbon atoms.) Or tetrakis- [methylene-3- ( 3,
5-di-t-butyl-4-hydroxyphenyl) propionate] methane is a phenolic antioxidant (antioxidant B).
（Ｉ）式で表わされる化合物としてはオクタデシル−３
−（3,5−ジ−ｔ−ブチル−４−ヒドロキシフェニル）
プロピオネート、およびラウリル−３−（3,5−ジ−ｔ
−ブチル−４−ヒドロキシフェニル）プロピオネートが
挙げられ好適に使用される。The compound represented by the formula (I) is octadecyl-3.
-(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate, and lauryl-3- (3,5-di-t
-Butyl-4-hydroxyphenyl) propionate is mentioned and is preferably used.
酸化防止剤Ｂの添加量は樹脂組成物100重量部に対し0.0
2〜0.5重量部、好ましくは0.03〜0.3重量部である。添
加量が0.02重量部以下では本発明の改良効果が小さく、
0.5重量部以上では改良効果が頭打ちであり、プリード
等の問題が新たに発生して不適当である。The addition amount of the antioxidant B is 0.0 with respect to 100 parts by weight of the resin composition.
It is 2 to 0.5 parts by weight, preferably 0.03 to 0.3 parts by weight. If the addition amount is 0.02 parts by weight or less, the improvement effect of the present invention is small,
If the amount is more than 0.5 parts by weight, the improvement effect will reach a ceiling, and problems such as bleeding will newly occur, which is unsuitable.
本発明に係るポリプロピレン樹脂組成物は、本発明の目
的の達成を阻害しない範囲で、これに無定形エチレン−
プロピレン共重合体や他の樹脂、酸化防止剤、帯電防止
剤、滑剤、充填剤、着色材、殺菌材、光安定剤等を随時
添加することができる。The polypropylene resin composition according to the present invention contains amorphous ethylene-
Propylene copolymers and other resins, antioxidants, antistatic agents, lubricants, fillers, coloring agents, bactericidal agents, light stabilizers and the like can be added at any time.
本発明のポリプロピレン樹脂組成物は上記各成分を適宜
の順序で配合し、押出機、ヘンシェルミキサー、バンバ
リーミキサー等の通常の手段によって混合して得られ、
特に押出機等を用いることによってシート、フイルム等
の特定形状の成形品とすることができる。また、ドライ
ブレンドしたものを押出機等を用いて直接成形して所望
の成形品を得ることができる。The polypropylene resin composition of the present invention is obtained by mixing the above components in an appropriate order and mixing them by a usual means such as an extruder, a Henschel mixer, a Banbury mixer,
Particularly, by using an extruder or the like, a molded product having a specific shape such as a sheet or film can be obtained. Further, a dry-blended product can be directly molded using an extruder or the like to obtain a desired molded product.
以上のようにして得られる本発明の熱成形食品容器用ポ
リプロピレン樹脂シートの厚みは0.01〜5mm、好ましく
は0.1〜3mmであり、この樹脂シートは単層で使用しても
良いし、他の樹脂と多層シートにして使用しても良く、
真空成形、圧空成形または熱板加熱式圧空成形等により
食品容器に二次成形される。The thickness of the polypropylene resin sheet for thermoformed food containers of the present invention obtained as described above is 0.01 to 5 mm, preferably 0.1 to 3 mm, and this resin sheet may be used as a single layer, or other resin. It may be used as a multilayer sheet,
Secondary molding is performed on the food container by vacuum molding, pressure molding or hot plate heating pressure molding.
＜発明の効果＞ 以上の如く、本発明により、溶融張力に優れかつ臭気の
改良された熱成形用ポリプロピレン樹脂シートが提供さ
れる。<Effects of the Invention> As described above, the present invention provides a polypropylene resin sheet for thermoforming having excellent melt tension and improved odor.
従って、本発明に係るポリプロピレン樹脂シートは、上
記性質により種々の用途に有用である。Therefore, the polypropylene resin sheet according to the present invention is useful for various applications due to the above properties.
とりわけ、熱成形分野での利用に適しており、食品、冷
菓、乳酸飲料等の食品包装容器、トレー類の製造、に使
用され、食品内容物をそのまま、あるいは熱間充填や加
熱殺菌等の処理を施して保存でき、かつ食品のフレーバ
ー性が好適に維持可能となる。In particular, it is suitable for use in the thermoforming field and is used for the production of food packaging containers such as foods, frozen desserts and lactic acid beverages, trays, etc., and the food contents as they are, or treatments such as hot filling and heat sterilization It is possible to preserve the flavor of the food by applying it.
〈実施例〉 以下、実施例をあげ、本発明をさらに具体的に説明す
る。なお、各例において使用した測定法は次のとおりで
ある。<Examples> Hereinafter, the present invention will be described more specifically with reference to Examples. The measuring method used in each example is as follows.
１）メルトインデックス（MI）の測定 JIS K6758に準じてポリプロピレンでは230℃、ポリエチ
レンの場合は190℃で測定した。1) Measurement of melt index (MI) Measured at 230 ° C for polypropylene and 190 ° C for polyethylene according to JIS K6758.
２）メルトテンション（溶融張力）の測定 メルトテンションテスター（東洋精機（株）製）を用
い、ノズル径2,095mm、長さ6mmのオリフィスで、190℃
で降下速度5.7mm/min、巻取り速度15.8m/分で測定し
た。2) Measurement of melt tension (melt tension) Using a melt tension tester (manufactured by Toyo Seiki Co., Ltd.), with a nozzle diameter of 2,095 mm and an orifice of 6 mm, 190 ° C
At a descent speed of 5.7 mm / min and a winding speed of 15.8 m / min.
８）臭気テスト フレーバー性の評価としてシートの臭気テストをおこな
った。容量250mlのガラス製フタ付き広口ビンにシート
を数mmの大きさに裁断した試料20gを入れ、60℃のオー
ブン中で30分間状態調整したのち、気相部の臭気の強度
を３人で５段階で評価した。8) Odor test The odor test of the sheet was performed as an evaluation of flavor property. Put 20g of the sample cut into a size of several mm into a wide-mouthed bottle with a lid of 250ml in capacity, and adjust the condition for 30 minutes in an oven at 60 ℃, and then adjust the odor intensity of the gas phase part by 5 people. The grade was evaluated.
1:臭気強度 弱い 2: 〃 やや弱い 3: 〃 中 4: 〃 強い 5: 〃 非常に強い 実施例１ MIが0.3g/10分のポリプロピレンホモポリマー85重量部
とMIが0.4g/10分（190℃）の低密度ポリエチレン15重量
部からなる樹脂組成物100重量部に対してカルシウムス
テアレート0.05重量部、酸化防止剤Ａとして、ビス（2,
4−ジ−ｔ−ブチルフェニル）ペンタエリスリトールジ
フォスファイト0.1重量部、酸化防止剤Ｂとしてオクタ
デシル−３−（3,5−ジ−ｔ−ブチル−４−ヒドロキシ
フェニル）プロピオネート0.10重量部を加え、ヘンシェ
ルミキサーで混合し、65mmφ押出機を用いて230℃で押
出してペレット化した。このペレットをＴダイを備えた
65mmφ押出機を用いてダイの設定温度240℃で押出し、
厚さ0.3mm、幅225mmのシートを作成した。1: Odor intensity is weak 2: 〃 Moderate 3: Medium 〃 Medium: 〃 Strong 5: 〃 Very strong Example 1 MI of 0.3 g / 10 min polypropylene homopolymer 85 parts by weight and MI of 0.4 g / 10 min ( (190 ° C) 0.05 parts by weight of calcium stearate to 100 parts by weight of a resin composition consisting of 15 parts by weight of low-density polyethylene, and bis (2,
0.1 parts by weight of 4-di-t-butylphenyl) pentaerythritol diphosphite and 0.10 parts by weight of octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate as antioxidant B are added, The mixture was mixed with a Henschel mixer and extruded at 230 ° C. using a 65 mmφ extruder to form pellets. This pellet was equipped with a T-die
Extrude at a die temperature of 240 ° C using a 65 mmφ extruder,
A sheet with a thickness of 0.3 mm and a width of 225 mm was created.
得られたシートの諸物性を測定した。結果を第１表に示
した。Various physical properties of the obtained sheet were measured. The results are shown in Table 1.
実施例2,3 実施例１において酸化防止剤Ａと酸化防止剤Ｂの種類を
変える以外は実施例１と同様におこなった。結果を第１
表に示した。Examples 2 and 3 The same procedure as in Example 1 was performed except that the types of the antioxidant A and the antioxidant B were changed. First result
Shown in the table.
実施例４ MIが0.3g/10分で、エチレン含量4.2wt％のブロックコポ
リマー100重量部を使用する以外は実施例１と同様にお
こなった結果を第１表に示した。Example 4 Table 1 shows the results obtained in the same manner as in Example 1 except that 100 parts by weight of the block copolymer having an MI of 0.3 g / 10 minutes and an ethylene content of 4.2 wt% was used.
比較例１ 実施例１において酸化防止剤Ａは添加せず、酸化防止剤
Ｂとさらに2,6−ジ−ｔ−ブチル−４−ヒドロキシトル
エンを0.1重量部添加する以外は実施例１と同様におこ
なった。Comparative Example 1 Same as Example 1 except that the antioxidant A was not added in Example 1 and 0.1 part by weight of the antioxidant B and 2,6-di-t-butyl-4-hydroxytoluene were further added. I did it.
結果を第１表に示した。The results are shown in Table 1.
比較例２ 酸化防止剤Ａとして、ビス（2,4−ジ−ｔ−ブチルフェ
ニル）ペンタエリスリトールジフォスファイト0.2重量
部を添加し、酸化防止剤Ｂを添加しない以外は実施例１
と同様におこなった。結果を第１表に示した。Comparative Example 2 Example 1 except that 0.2 part by weight of bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite was added as the antioxidant A and the antioxidant B was not added.
Same as above. The results are shown in Table 1.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｌ 53/00 ＬＬＹ //(Ｃ０８Ｌ 23/10 23:04） (Ｃ０８Ｋ 5/00 5:524 5:13） (72)発明者 黒田 和久 千葉県市原市姉崎海岸５の１ 住友化学工 業株式会社内 (56)参考文献 特開 昭56−88444（ＪＰ，Ａ) 特開 昭50−21045（ＪＰ，Ａ) 特開 昭61−181844（ＪＰ，Ａ) 特開 昭62−25130（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication C08L 53/00 LLY // (C08L 23/10 23:04) (C08K 5/00 5: 524 5 : 13) (72) Inventor Kazuhisa Kuroda 1-5 Anezaki Kaigan, Ichihara, Chiba Sumitomo Chemical Co., Ltd. (56) Reference JP 56-88444 (JP, A) JP 50-21045 (JP) , A) JP 61-181844 (JP, A) JP 62-25130 (JP, A)
Claims (1)
レン０〜30重量％からなる樹脂組成物100重量部に対
し、有機フォスファイト化合物から選ばれた１種または
２種以上の酸化防止剤0.02〜0.5重量部、及び一般式
（Ｉ） （但し、R1はメチル基またはｔ−ブチル基を、R2は炭素
数12〜18の直鎖又は分岐アルキル基を示す。）で表され
る化合物又はテトラキス−〔メチレン−３−（3,5−ジ
−ｔ−ブチル−４−ヒドロキシフェニル）プロピオネー
ト〕メタンから選ばれたフェノール系酸化防止剤0.02〜
0.5重量部を含有するポリプロピレン樹脂組成物を押出
成形してなることを特徴とする熱成形食品容器用ポリプ
ロピレン樹脂シート。1. One or more antioxidants 0.02 to 0.5 selected from organic phosphite compounds per 100 parts by weight of a resin composition consisting of 70 to 100% by weight of polypropylene and 0 to 30% by weight of polyethylene. Parts by weight and general formula (I) (However, R 1 represents a methyl group or a t-butyl group, and R 2 represents a linear or branched alkyl group having 12 to 18 carbon atoms.) Or tetrakis- [methylene-3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate] Phenolic antioxidant selected from methane 0.02-
A polypropylene resin sheet for a thermoformed food container, which is obtained by extruding a polypropylene resin composition containing 0.5 part by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60227587A JPH07107117B2 (en) | 1985-10-11 | 1985-10-11 | Polypropylene resin sheet for thermoformed food containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60227587A JPH07107117B2 (en) | 1985-10-11 | 1985-10-11 | Polypropylene resin sheet for thermoformed food containers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6286039A JPS6286039A (en) | 1987-04-20 |
| JPH07107117B2 true JPH07107117B2 (en) | 1995-11-15 |
Family
ID=16863254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60227587A Expired - Lifetime JPH07107117B2 (en) | 1985-10-11 | 1985-10-11 | Polypropylene resin sheet for thermoformed food containers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07107117B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62141066A (en) * | 1985-12-13 | 1987-06-24 | Adeka Argus Chem Co Ltd | Stabilized synthetic resin composition |
| JP2660419B2 (en) * | 1988-04-02 | 1997-10-08 | 旭電化工業株式会社 | Stabilized synthetic resin composition |
| JPH0299541A (en) * | 1988-10-05 | 1990-04-11 | Mitsui Toatsu Chem Inc | Polypropylene resin composition |
| JPH037744A (en) * | 1989-06-05 | 1991-01-14 | Adeka Argus Chem Co Ltd | Olefin resin composition |
| JP4734746B2 (en) * | 2001-04-06 | 2011-07-27 | 住友化学株式会社 | Molded food packaging |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230172B2 (en) * | 1973-06-23 | 1977-08-06 | ||
| JPS6054344B2 (en) * | 1979-12-19 | 1985-11-29 | ウェルファイド株式会社 | Polyolefin resin composition |
| JPH0645735B2 (en) * | 1985-02-06 | 1994-06-15 | 三菱化成株式会社 | 3-Methylbutene-1 polymer composition |
-
1985
- 1985-10-11 JP JP60227587A patent/JPH07107117B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6286039A (en) | 1987-04-20 |
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