200848457 九、發明說明： 【發明所屬之技術領城】 發明領域 本發明有關特別滴 組成。本發明亦_/可熱封合膜的聚烯烴轉製塗層 層組成，特別離之封合之聚_系掩製塗 及使用可熱封合膜及可=稀系基材。本發明亦有關製造 可更有效用於擠製塗>2之封合的方法。本發明亦有關 【先前技術】成。 10 發明背景 15 20 -特別期待的塗層為物件以修·物件的性質。 壓力的使用與本身、另…合膜’·亦即，—能夠在熱及/或 法中，此物件可被封合^或另—基材結合_。在此方 構。此結合的結果封合^金/成如袋或其他包裝材料的結 封合。可熱封合及可_==此材料衫為—可剝離之 膜，，)大規模的用於暫時密封丄5(本文亦稱之為“可剝離之 藥物裝置。在使用期間，二’例如，用於食物產品或 封合層以打開包褒。為了得到、分離可剝離膜之熱 可熱封合及可剝離之膜具有^費者者的可接受性，期待 容4 、 數個特性。例如，此膜需提供 备為或袋之封合的防漏。為一代 為達形成袋及同時以所欲二衣，一般使用熱封合。 置。此已構建多種裝 成姻及·封合機器。亦可韻-及射及水平形 使用其他型式的形成機器，如 200848457 可先製成袋者。 此些機器基上具有成形套筒或桿，其可將膜平坦 形為袋的管狀形狀。熱金屬封合夾具由開啟位置移動至閉 合位置’接觸該膜以封合其為一袋形狀。在封合操作期間， 5膜的外層與封合爽具的熱金屬表面直接接觸。熱因•由 膜外層傳送以溶融及融合層的内封合物層而形成_封合。 通常，此外層具有一比内封合物層高的熔融温度。就本身 而言’雖然内封合物層炫㈣形成—封合，膜的外層不能 溶融且不會黏至封合的夾具。在封合的夾具再開啟時，此 10 膜冷卻至室温。 在内封合物層冷卻至室温前，其需能維持其封合整體 性。黏合層或封合物層在當仍為熱或熔融態時防止此封合 漫延的能力通常稱之為“熱黏著，，。為了形成一良好封合: 可封合及可剝離之膜的熱黏著必須適當且熱黏著起始溫度 15必須足夠的低。熱黏著起始温度為最低温度，在此溫度封 合強度達到1N/I5mm，此封合係以5匪寬的封合桿在壓力 為0.5 N/mm2下靜止時間為〇.5秒及冷卻時間為〇2秒而形 成，及封合強度以-在拉力速度為2〇〇醜/秒的熱黏著測試 裔測篁。熱黏著温度窗為超過此温度範圍下熱黏著具有至 2〇 少 1N/I5mm 值。 ' 除了適當的熱黏著，其亦需要具有一低的熱封合起始 温度，其可助於確保快速的包裝生產線速度且一可適應製 程條件變化之廣封合窗，如屢力及溫度。此熱封合起始温 度為最低温度，在此温度封合強度可達到測5麵，其係 6 200848457 在以5mm寬的封合桿在壓力為〇.5N/mm2下靜止時間為0.5 秒而形成封合後之至少24小時測量，且此封合強度以一張 力測試器在機械方以100 mm/分鐘分離封合。此封合温度窗 超過此温度範圍下封合強度具有至少2N/15mm值。 5 一廣的封合窗亦可使熱感性產品高速度包裝，且提供 在包裝或填充速度改變的一程度包容。 對於可剝離之封合，除了前述之“可封合，，特性外，此 組成亦可具有一所欲的“可剝離”特性，其需要用以提供一 在包裝或袋易於開啟之封合。可剝離性通常為指稱在打開 10 一包裝過程中分開二材料或基材而未犠牲二者的完整性。 需要將一封合拉開的力稱之為“封合強度，，或“熱封合強 度’’ ’其可依ASTM F88-94測定。所欲的封合強度依終使用 者的應用而不同。為了可撓性的包裝應用，如麥片内包裝、 零食食物包裝、餅乾條及蛋糕混合物内包裝，需要的封合 15強度通常在2 - 25 N/15mm範圍間。例如，為了易於打開麥 片盒内包裝，通常指定封合強度在4-8 N/15mm範圍内，雖 然依各自的製造需求可依特定目的變化。除了可撓性的包 裝應用’ 一可封合及可剝離之膜亦可用於剛性包裝應用， 如便利物品的蓋(例如，零食食品如布丁）及藥用裝置。基本 上剛性的包裝具有一2—13 N/15mm的封合強度。此封合層可 在蓋上或在容器上或二者上。 對一可熱封合之膜（包括可剝離以及非可剝離之封合) 之其他所欲的特性包括一低摩擦係數及良好抗濫用性。一 低摩擦係數確保封合物層在包裝及製造設備上可平順及有 200848457 良且對於垂直形成填充_及★合包裝為特別重畏。 =抗濫用性及祕為需要的，例如，在麥片盒内包裝 包規卿、硬性麥k撕裂及穿孔。其他的特性 未道及氣味性能與阻障或傳送性質。 再者’若熱封合膜可藉由擠製塗層方法施用至基材 在此-環境中樹脂的可處理性亦為重要的。”可處理性” 匕括參數如改良向内彎曲，減少拉伸不安定性及電力消耗。 〜可熱封合及可剝離之通常由至少一聚合物樹脂製成。 可熱封合及可剝離之膜的結果特性主要依賴用於形成膜 的樹脂型丨。例如，乙稀乙酸乙稀醋（EVA)及乙稀甲基丙稀 酸酉旨(EMA)共聚物提供優良的熱封合性f。然而，以此些 共聚物產生的封合通常在未破壞膜下不能獲得，使得其等 不適合用於可剝離之封合應用。為了避免此一問題，聚丁 埽可與一 EVA聚合物混合以產生一可熱封合及可剝離之 膜。雖然改良此膜的可剝離性，但可熱封合及可剝離之膜 具有一些令人不悅的氣味，此係因EVA的存在。除了使用 聚丁烯，某些離聚物，如SURLYN®，可與EVA混合以產生 〜可熱封合及可剝離之膜。雖然此膜為可剝離的，其造成 §膜分離時的細絲或“天使髮(angel hair)”。再者，離聚物通 2〇 常為昂貴且可能亦具有某些氣味的問題。 美國專利第6,590,034號描述由二不相混溶的聚合物混 合物製成可剝離之封合，其形成一連續相及一不連續相， 其中二聚合物的剪力黏度差別之絕對值為少於1〇〇百分 比。雖然涵括許多可能的材料，但此參考專利著重於使用 8 200848457 均聚物聚丙烯為不連續相。 雖然已使用數種樹脂系統製造一可熱封合膜，其持續 存在-改良成本有效性且在處理及運送期間以及在終消費 者打開包裝時具有所欲的封合強度之可熱封合膜的需求， 5特別是在可剝離之封合的例子中。需要用以製造此可熱封 合及可剝離之膜的樹脂系統具有相對較低的封合起始:度 及熱黏著起始温度與-相對廣的熱封合窗。亦需要此可^ 封合及可剥離之膜相對抗老化性且具有—相對較低摩擦係 數及良好的抗濫用性及祕。亦需要此適於擠製塗覆封合 10於一基材上的樹脂系統，其特徵為㈣低向内彎曲及相: 南拉延值。 C 明内1 發明概要 已發現佔總組成物之50至92重量百分比的丙稀係彈性 15體或塑性體與8至50重量百分比的特定低密度聚乙稀換合 物及化合物可滿足此些許多目的。用於本發明之特 具有0.2至15 dg/分鐘·之熔融指數(I2)(ASTM Dl238，條件為 190〇C/2.16kg)及0.915至0.930 g/cm3之密度(ASTM 防幻換 一廣分子量分佈如Mw/Mn為5.0-13。 20 已說明本發明之樹脂組成物具有在可特別適於做為可 剝離封合之封合強度範圍内的封合強度，特別是在聚、 及聚乙烯系基材上。 圖式簡單說明 第1圖圖示在實施例1中二不同速度之擠製塗層生產線 9 200848457 上總向内彎曲數據的比較。 第2圖圖示在不同封合桿温度獲得之實施例2的封合於 24小時後測得的熱封合強度。 弟3圖圖不在不同封合桿温度獲得之實施例3的封合後 5 立刻測得的熱黏著強度。 第4圖圖示在實施例4封合至50微米聚丙烯膜24小時後 於不同封合桿温度獲得測得的熱封合強度。 C貧施方式3 較佳實施例之詳細說明 ° 本文定義之”撤回’’為意指基材的移動速度，因此延伸 或延長一熔融聚合物擠壓物。 向内彎曲為基材上在模表面之熱溶融寬度與擠壓物 I度間的差異，除非特別指明，其係以毫米為單位。本文 提出的向内彎曲值係在每100公尺及每分鐘300公尺的撤回 速度下以-塗層重量為25g/m2 _U3kg/h的擠壓速度，其 係使用擠壓機設定温度曲線為約29代(除非_指明）之具 3〇:il/d螺栓及附有800 mm寬平坦模與具有一 〇·6醜模蓋 的擠製塗層線的3.5英叶擠壓機。 本文訓丨合物”—料意_衫論是相同或不同 的型式的聚合化單體所製備的化合物。因此泛用的聚合物 ^涵括“均聚物，，，其通常係指僅由—翻式單體製備的 <合物，以及由至少二種單體製備之聚合物的“共聚物”。 “低密度聚乙烯”一詞亦稱之為“ ldpe ”、“高 物，，或“高度分支之聚乙稀，，且定義為意指此聚合物在高: 200848457 14,500 psi (100 MPa)的壓力使用自由基起始劑如過氧化物 於高壓蚤或管狀反應器中部份或全部均聚化或共聚化（I 考，例如美國專利第4,599,392號，該專利併入本文參考）。 分子量分佈或“ MWD”一詞定義為重量平均分子量與 5 數平均分子量的比例(Mw/Mn)。Mw& Mn依在此技術領域已 知之使用傳統GPC的方法而測定。 ' Mw(絕對值)/Mw(GPC)比例定義其中Mw(絕對值）為由 於低角度（如15度）之光散射區域衍生的重量平均分子量及 聚合物的注入質量衍生，而Mw(GPC)為由GPC校正而獲得 10 的重量平均分子量。校正光散射偵測器以產出當量重量平 均分子量為線性聚乙烯均聚物標準的GPC設備如NBS 1475。 本發明有關一至少二組份之摻合物，此摻合物特別適 用於做為一可熱封合之膜。 15 本發明摻合物的第一組份為丙烯·系塑性體或彈性體 或“PBPE”。此些材料包含至少一共聚物，其具有至少約5〇 重量百分比之由丙烯衍生的單元，及至少約3重量百分比， 或甚而5重量百分比之由非丙烯之共聚單體衍生的單元。 適合之丙烯系彈性體及/或塑性體教示於WO 03/040442及 20 WO 07/024447，該些專利全文併入本案參考。 特別有利用於本發明者為具有MWD少於3.5之反應器 等級的PBPE。“反應器等級，’一詞欲指如美國專利第 6,010,588號中定義且通常指稱在聚合作用後分子量分佈 (MWD)或聚合分散性不會實質改變的。較佳之PBPE具有 11 200848457 一融合熱（使用如在美國專利申請案第60/709668號所述l DSC方法測定）少於約90焦耳/gm，較佳為少於約70焦界 /gm，尤以少於約50焦耳/gm為佳。當使用乙浠為共聚單體’ PBPE具有丙烯系彈性體或塑性體之3至12重量百分比之心 5 稀，或4至9重量百分比之乙稀。 雖然丙烯共聚物的其餘單元為由至少一共聚單體衍生 如乙烯、C4_2Ga -烯烴、C4_2G二烯、硬脂酸化合物及其等相 似物，較佳該共聚單體為乙烯及C4_2〇a_烯烴如1-己烯戒卜 辛烯之至少者。更佳者，共聚物其餘單元僅由乙烯衍生。 10 在丙烯系彈性體或塑性體之共聚單體中非乙烯的量1 少部份為共聚單體及共聚物所需的融合熱之函數。若共聚 單體為乙烯，則基本上共聚單體-衍生的單元包含超過共聚 物之15重量百分比。乙烯-衍生單元之最少量基本上為共聚 物重量之至少約3重量百分比，較佳為至少約5重量百分比 15且尤以至少約9重量百分比為佳。若聚合物包含乙烯外的至 少一其他共聚單體，則較佳的組成物將具有一融合熱約在 具有3至20wt%乙烯之丙烯·乙烯共聚物的範圍内。雖然不欲 以任何理論結合，咸認為獲得大致相似的結晶性及結晶態 利於獲得做為一可剝離封合的相似功能。 20 本發明之丙烯系塑性體或彈性體可以任何方法製造， 且包括無規、嵌段與接技共聚物，雖然共聚物較佳為無規 構形。此些包括由Ziegler-Natta、CGC(幾合限制觸媒）、金 烯、及非金烯、金屬-中心、雜芳配位體催化作用製成的共 聚物。其他適合之金屬錯合物包括對應下式之化合物： 12 200848457200848457 IX. INSTRUCTIONS: [Technical Guide to the Invention] Field of the Invention The present invention relates to a special drop composition. The invention also has the composition of a polyolefin conversion coating layer of a heat sealable film, in particular, a poly-based mask coating and a heat sealable film and a thin substrate. The invention is also directed to a method of making a seal that is more effective for extrusion coating > The invention is also related to [prior art]. 10 BACKGROUND OF THE INVENTION 15 20 - A particularly desirable coating is an object to repair the properties of the article. The use of pressure can be combined with itself, another film, that is, it can be sealed or combined with a substrate in heat and/or by law. In this structure. The result of this combination is sealed and sealed into a bag or other packaging material. Heat sealable and _== this material shirt is - peelable film,) large-scale for temporary sealing of 丄5 (also referred to herein as "peelable drug device. During use, two'" It is used in food products or sealing layers to open the package. In order to obtain and separate the heat-sealable and peelable film of the peelable film, it has the acceptability of the person, and it is expected to have four characteristics. For example, the film needs to be provided with a leak-proof seal for the bag or the bag. For the first generation, the bag is formed and the second coat is used at the same time, and the heat seal is generally used. This has been constructed into a variety of marriage and sealing. Machines. Also available in rhyme-and-shooting and horizontal shapes using other types of forming machines, such as 200848457, which can be made into bags. These machines have a forming sleeve or rod that flattens the film into a tubular shape of the bag. The hot metal sealing clamp is moved from the open position to the closed position to contact the film to seal it into a bag shape. During the sealing operation, the outer layer of the film 5 is in direct contact with the hot metal surface of the sealing device. • An inner seal layer that is transported from the outer layer of the film to dissolve and fuse the layer In general, the outer layer has a higher melting temperature than the inner seal layer. In fact, although the inner seal layer is dazzled (four) to form a seal, the outer layer of the film cannot be melted and does not stick to Sealed fixture. When the sealed fixture is reopened, the 10 film is cooled to room temperature. Before the inner seal layer is cooled to room temperature, it needs to maintain its seal integrity. The adhesive layer or the seal layer is The ability to prevent this seal from spreading when still in a hot or molten state is commonly referred to as "thermal adhesion," in order to form a good seal: the thermal adhesion of the sealable and peelable film must be appropriate and the thermal adhesion begins. The temperature 15 must be sufficiently low. The initial temperature of the thermal adhesion is the lowest temperature, and the sealing strength at this temperature reaches 1 N/I 5 mm. The sealing is performed at a pressure of 0.5 N/mm 2 at a pressure of 0.5 N/mm 2 . 5.5 seconds and the cooling time is 〇2 seconds, and the sealing strength is measured by the thermal adhesion test at a tensile speed of 2 〇〇 ug / sec. The thermal adhesion temperature window is hot adhesive above this temperature range. Has a value of 1N/I5mm to 2〇. ' In addition to proper heat adhesion, it also It is desirable to have a low heat seal initiation temperature that can help ensure rapid package line speeds and a wide range of sealing windows that can accommodate changes in process conditions, such as repeated force and temperature. This heat seal initiation temperature is the lowest. Temperature, at which the sealing strength can reach 5 faces, and the system 6 200848457 is measured at a pressure of 5 mm wide with a 5 mm wide sealing rod at a pressure of 〇5 N/mm 2 for a period of 0.5 seconds to form at least 24 hours after sealing. And the sealing strength is separated and sealed on the machine side by a force tester at 100 mm/min. The sealing temperature window exceeds the temperature range, and the sealing strength has a value of at least 2N/15 mm. The thermal sensitive product can also be packaged at a high speed and provided with a degree of tolerance in the change of the packaging or filling speed. For the peelable sealing, in addition to the aforementioned "sealable, characteristic, the composition can also have a desire The "peelable" feature is required to provide a seal that is easy to open in the package or bag. Peelability is generally referred to as the separation of two materials or substrates during the opening of a package without the integrity of both. The force required to pull a pull is referred to as "sealing strength," or "heat seal strength"' which can be determined in accordance with ASTM F88-94. The desired seal strength will vary depending on the application of the end user. For flexible packaging applications, such as cereal packaging, snack food packaging, biscuit strips, and cake mix packaging, the required seal 15 strength is typically in the range of 2 - 25 N/15 mm. For example, in order to easily open the inner package of the cassette, it is usually specified that the sealing strength is in the range of 4-8 N/15 mm, although it may vary depending on the specific purpose for the respective manufacturing requirements. In addition to flexible packaging applications, a sealable and peelable film can also be used in rigid packaging applications such as lids for convenience items (e.g., snack foods such as puddings) and medicinal devices. The substantially rigid package has a seal strength of 2-13 N/15 mm. This sealing layer can be on the lid or on the container or both. Other desirable properties for a heat sealable film, including peelable and non-peelable seals, include a low coefficient of friction and good abuse resistance. A low coefficient of friction ensures that the sealant layer is smooth on packaging and manufacturing equipment and has a good weight of 200848457 and is particularly important for vertical filling and packaging. = Abuse and seizures are needed, for example, in the cereal box, the package, the hard wheat k tear and the perforation. Other properties are not known and odor properties and barrier or transfer properties. Further, if the heat seal film can be applied to the substrate by an extrusion coating method, the handleability of the resin in this environment is also important. "Processability" includes parameters such as improved inward bending to reduce stretch instability and power consumption. ~ Heat sealable and peelable are usually made of at least one polymer resin. The resulting properties of the heat sealable and peelable film are primarily dependent on the resin type enamel used to form the film. For example, ethyl acetoacetate (EVA) and ethylene methacrylate (EMA) copolymers provide excellent heat sealability f. However, the seals produced by such copolymers are generally not available under unbroken films, making them unsuitable for use in peelable sealing applications. To avoid this problem, polybutylene can be mixed with an EVA polymer to produce a heat sealable and peelable film. Although the peelability of the film was improved, the heat sealable and peelable film had some unpleasant odor due to the presence of EVA. In addition to the use of polybutene, certain ionomers, such as SURLYN®, can be combined with EVA to produce a heat sealable and peelable film. Although the film is peelable, it causes a filament or "angel hair" when the film is separated. Furthermore, ionomers are often expensive and may also have some odor problems. U.S. Patent No. 6,590,034 describes a peelable seal formed from a two immiscible polymer mixture which forms a continuous phase and a discontinuous phase wherein the absolute difference in shear viscosity difference of the two polymers is less than 1〇〇 percentage. Although encompassing many possible materials, this reference patent focuses on the use of 8 200848457 homopolymer polypropylene as a discontinuous phase. Although a number of resin systems have been used to make a heat sealable film, it persists - heat sealable film that improves cost effectiveness and has the desired seal strength during handling and shipping and when the consumer opens the package. The requirements, 5 are especially in the case of peelable closures. Resin systems that are required to make such heat sealable and peelable films have relatively low seal initiation: degrees and thermal adhesion initiation temperatures and - relatively wide heat sealing windows. It is also desirable that the sealable and peelable film be relatively resistant to aging and have a relatively low friction coefficient and good abuse resistance and seizure. There is also a need for a resin system suitable for extrusion coating a seal 10 onto a substrate characterized by (4) low inward bending and phase: south draw values. C 明内1 Summary of the Invention It has been found that 50 to 92% by weight of the total composition of the propylene-based elastomer 15 or plastomer and 8 to 50% by weight of the specific low-density polyethylene compound and compound can satisfy this Multi-purpose. The present invention has a melt index (I2) of 0.2 to 15 dg/min. (ASTM Dl238, condition: 190 〇C/2.16 kg) and a density of 0.915 to 0.930 g/cm3 (ASTM anti-magic change to a wide molecular weight) The distribution such as Mw/Mn is 5.0-13. 20 It has been explained that the resin composition of the present invention has a sealing strength in a range of sealing strength which is particularly suitable as a peelable seal, particularly in poly, and polyethylene. On the substrate. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a comparison of total inward bending data on two different speed extrusion coating lines 9 200848457 in Example 1. Figure 2 illustrates the temperature at different sealing rods The heat seal strength measured after 24 hours of sealing obtained in Example 2 was obtained. Fig. 3 is a graph showing the heat adhesion strength measured immediately after the sealing of Example 3 obtained at different seal bar temperatures. The figure shows the measured heat seal strength at different seal bar temperatures after 24 hours of sealing to a 50 micron polypropylene film in Example 4. C lean mode 3 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Withdrawal of '' means the speed of movement of the substrate, thus extending or extending a molten polymer extrusion Inward bending is the difference between the hot melt width on the substrate surface and the extrudate I degree, unless otherwise specified, in millimeters. The inward bending value proposed in this paper is per 100 meters. And at a withdrawal speed of 300 meters per minute with a coating weight of 25 g/m2 _U3 kg/h, which is set using an extruder with a temperature profile of about 29 generations (unless specified). Il/d bolts and a 3.5-inch extruder with an 800 mm wide flat die and an extruded coating line with a 〇 6 丑 模 。 。 。 。 。 。 。 。 。 本文 本文Different types of compounds prepared by polymerizing monomers. Therefore, the general-purpose polymers include "homopolymers, which generally refer to <compounds prepared only from-turned monomers, and by at least The "copolymer" of a polymer prepared from two monomers. The term "low density polyethylene" is also referred to as "ldpe", "high object," or "highly branched polyethylene, and is defined as meaning This polymer is used at a high pressure: 200848457 14,500 psi (100 MPa) using a free radical initiator such as peroxide in a high pressure crucible or Some or all of the reactors are homopolymerized or copolymerized (see, for example, U.S. Patent No. 4,599,392, incorporated herein by reference). The ratio of molecular weight (Mw/Mn). Mw & Mn is determined by the method known in the art using conventional GPC. 'Mw (absolute value) / Mw (GPC) ratio is defined where Mw (absolute value) is due to low angle The weight average molecular weight derived from the light scattering region (e.g., 15 degrees) and the injection quality of the polymer are derived, and Mw (GPC) is a weight average molecular weight obtained by GPC correction. The light scattering detector is calibrated to produce a GPC device such as NBS 1475 with an equivalent weight average molecular weight of the linear polyethylene homopolymer standard. The present invention relates to a blend of at least two components which is particularly suitable for use as a heat sealable film. The first component of the blend of the present invention is a propylene-based plastomer or elastomer or "PBPE". Such materials comprise at least one copolymer having at least about 5 weight percent of propylene derived units, and at least about 3 weight percent, or even 5 weight percent of units derived from non-propylene comonomers. Suitable propylene-based elastomers and/or plastomers are taught in WO 03/040442 and 20 WO 07/024447, the entireties of which are incorporated herein by reference. Particularly advantageous for use in the present inventors is a PBPE having a reactor rating of less than 3.5. The term "reactor grade," is intended to mean that the molecular weight distribution (MWD) or polymer dispersibility does not substantially change after polymerization, as defined in U.S. Patent No. 6,010,588. Preferably, PBPE has a heat of fusion of 11 200848457 ( Preferably less than about 90 Joules/gm, preferably less than about 70 Joules/gm, especially less than about 50 Joules/gm, as determined by the DSC method described in U.S. Patent Application Serial No. 60/709,668. When acetamethylene is used as the comonomer 'PBPE has 3 to 12 weight percent of the propylene-based elastomer or plastomer, 5 or 4 to 9 weight percent of ethylene. Although the remaining units of the propylene copolymer are at least A comonomer is derivatized such as ethylene, C4_2Ga-olefin, C4_2G diene, stearic acid compound and the like, preferably the comonomer is ethylene and a C4_2〇a-olefin such as 1-hexene octene octene. More preferably, the remainder of the copolymer is derived solely from ethylene. 10 The amount of non-ethylene in the comonomer of the propylene-based elastomer or plastomer is less than the amount of heat of fusion required for the comonomer and copolymer. a function if the comonomer is ethylene The comonomer-derived unit comprises more than 15% by weight of the copolymer. The minimum amount of ethylene-derived unit is substantially at least about 3 weight percent of the weight of the copolymer, preferably at least about 5 weight percent 15 and especially Preferably at least about 9 weight percent. If the polymer comprises at least one other comonomer other than ethylene, the preferred composition will have a heat of fusion of about propylene/ethylene copolymer having from 3 to 20 weight percent ethylene. Although it is not intended to be combined in any theory, it is believed that obtaining substantially similar crystallinity and crystalline state facilitates obtaining a similar function as a peelable seal. 20 The propylene-based plastomer or elastomer of the present invention can be produced by any method, and Including random, block and graft copolymers, although the copolymer is preferably in a random configuration. These include Ziegler-Natta, CGC (restricted catalyst), gold, and non-metal, metal - a copolymer prepared by the catalysis of a central or heteroaromatic ligand. Other suitable metal complexes include compounds corresponding to the formula: 12 200848457
〇g 其中： R2〇為一不計算氫為5至20原子的香族或惰性取代之— 香族基，或其等之多價衍生物； 方 T為一不計异氣為5至20原子的亞烴基或;g夕甲燒美，咬 其等之惰性取代的衍生物； M3為一第4族金屬，較佳為锆或铪； G為陰性、中性或一陰性配位體基；較佳為不計算氫 為咼至20原子之鹵化物、烴基或二烴基醯胺； g為1至5的正數，其指明G基團的數目；及 共價與電子予體的交互作用分別以線及箭頭表示。 較佳地，此錯合物對應於下式：〇g where: R2〇 is a non-calculated 5 to 20 atomic aromatic or inertly substituted-fragrance group, or a multivalent derivative thereof; square T is an inert gas of 5 to 20 atoms An alkylene group; or an inertly substituted derivative such as a bite; M3 is a Group 4 metal, preferably zirconium or hafnium; and G is a negative, neutral or a negative ligand group; Preferably, hydrogen is not a halide, a hydrocarbyl group or a dihydrocarbyl decylamine; the g is a positive number from 1 to 5, which indicates the number of G groups; and the interaction between covalent and electron donors is in the line And the arrow indicates. Preferably, the complex corresponds to the following formula:
其中： T為-不汁异氫為5至2〇原子的二價橋接基團，較佳為 取代之或未取代之C3_6烯基；及 * Ar在每情況下各自為一不計算氫為$至加原子的芳 烯基或烷基-或芳基-取代之芳烯基·， M3為一第4族金屬，較佳為锆或铪； G在每-情況下各自為-陰性、中性或二陰性配位體基； 13 200848457 g為1至5的正數，其指明X基團的數目；及 電子予體的交互作用分別以線及箭頭表示。 前述化學式之金屬錯合物的範例包括下列化合物：Wherein: T is a divalent bridging group having a non-aqueous isohydrogen of 5 to 2 Å, preferably a substituted or unsubstituted C3_6 alkenyl; and *Ar is in each case an uncalculated hydrogen of $ To the atomic aralkenyl or alkyl- or aryl-substituted aralkenyl group, M3 is a Group 4 metal, preferably zirconium or hafnium; G is -negative, neutral in each case Or a di-negative ligand group; 13 200848457 g is a positive number from 1 to 5, which indicates the number of X groups; and the interaction of the electron donors is indicated by lines and arrows, respectively. Examples of metal complexes of the foregoing formula include the following compounds:
5 其中M3為Hf或Zr ;5 wherein M3 is Hf or Zr;
At·4為C6_2G芳基或其等之惰性取代衍生物，特別是3,5-二（異丙基）苯基、咔唑、3,5-二（異丁基）苯基、二苯並-1H-。比洛-1 -基、或恩-5 -基’及 T4在每一情況下各自為包含一c3_6烯基、一c3_6環烯 10 基、或其等之惰性取代衍生物； R21在每一情況下各自為氫、鹵素、烴基、三烴甲矽烷 基或一不計算氫為高至50原子之三烴基甲矽烷基烴基；及 G在每一情況下各自為鹵素或烴基或一不計算氫為高 至20原子之三烴基甲矽烷基，或二G基團共同為前述烴基或 15 三烴基甲矽烷基之二價衍生物。 例示之丙烯共聚物包括Exxon-Mobil VISTAMAXXTM 聚合物、及陶氏化學公司之VERSIFY™丙烯/乙烯彈性體及 塑性體。 14 200848457 本發明之丙烯系彈性體或塑性體的密度基本上當以 ASTM D-792測量時為至少約0.850 g/cm3 ，可至少為約 0.860 g/cm3及亦可至少為約0·865 g/cm3。此密度較佳為少 於約 0_89 g/cc 〇 5 本發明之丙烯系彈性體或塑性體的重量平均分子量 (Mw)可非常廣，但基本上在1〇,〇〇〇至1，〇〇〇,〇〇〇間（需瞭解此 僅在最小或最大Mw的限制為經由實際考量而設定）。用於 製造可剝離之封合的均聚物及共聚物，其最小的Mw較佳為 約20,000，尤以約25,000為佳。 10 本發明之丙烯系彈性體或塑性體聚合分散性基本上為 在2至5間。“窄聚合分散性”、“窄分子量分佈”、“窄Mwd，， 及相似的詞意指重量平均分子量（Mw)與數平均分子量 (Μη)的比例（Mw/Mn)為少於約3.5，可少於約3.0，亦可少於 約2.8，亦可少於約2.5。 15 用於本發明之PBPE理想上具有0.5至2000g/10分鐘之 MFR，較佳為由1至1000 g/ΙΟ分鐘間，尤以在2至500g/10分 鐘間為宜，最佳為在2至4〇 g/i〇分鐘間。選定之特殊MFR 部份為依製造方法而定如吹膜、擠製塗層、片材擠壓、射 出成型模製或鑄模膜方法。丙烯及乙烯及/或至少一 20 c4_C2〇a-烯烴之共聚物的乂叹係以astm d-1238條件 L(2.16kg，230°〇測定。 依下列校正方程式估算大於約25〇之MFR : MFR =9x1018Mw~3 3584At·4 is a C6_2G aryl group or an inert substituted derivative thereof, particularly 3,5-di(isopropyl)phenyl, carbazole, 3,5-di(isobutyl)phenyl, dibenzo -1H-. Bilo-1 -yl, or en-5-yl' and T4 are each in each case an inert substituted derivative comprising a c3_6 alkenyl group, a c3_6 cycloalkenyl group, or the like; R21 in each case Each is hydrogen, halogen, hydrocarbyl, trihydrocarbylalkyl or a trihydrocarbylalkylene hydrocarbyl group having up to 50 atoms without hydrogen; and G is each a halogen or a hydrocarbyl group or an uncalculated hydrogen in each case Up to 20 atomic trihydrocarbylalkyl groups, or diG groups are a divalent derivative of the aforementioned hydrocarbyl group or 15 trihydrocarbylcarbenyl group. Exemplary propylene copolymers include Exxon-Mobil VISTAMAXXTM polymers, and the VERSIFYTM propylene/ethylene elastomers and plastomers from The Dow Chemical Company. 14 200848457 The propylene-based elastomer or plastomer of the present invention has a density of at least about 0.850 g/cm3, at least about 0.860 g/cm3, and may also be at least about 0.865 g/, measured substantially as measured by ASTM D-792. Cm3. The density is preferably less than about 0-89 g/cc. 〇5 The weight average molecular weight (Mw) of the propylene-based elastomer or plastomer of the present invention can be very broad, but is substantially 1 〇, 〇〇〇 to 1, 〇〇 〇, 〇〇〇 (To understand this, only the minimum or maximum Mw limit is set by actual consideration). The homopolymers and copolymers used in the manufacture of peelable seals preferably have a minimum Mw of about 20,000, especially about 25,000. The propylene-based elastomer or plastomer of the present invention has a polymerization dispersibility of substantially 2 to 5. "Narrow polymer dispersibility", "narrow molecular weight distribution", "narrow Mwd," and similar terms mean that the ratio of weight average molecular weight (Mw) to number average molecular weight (?n) (Mw/Mn) is less than about 3.5, It may be less than about 3.0, less than about 2.8, or less than about 2.5. 15 The PBPE used in the present invention desirably has an MFR of from 0.5 to 2000 g/10 minutes, preferably from 1 to 1000 g/min. In particular, it is preferably between 2 and 500 g/10 min, preferably between 2 and 4 g/i min. The selected special MFR part is determined by the method of manufacture such as blown film and extruded coating. , sheet extrusion, injection molding or casting film method. The sigh of propylene and ethylene and / or at least a copolymer of 20 c4_C2 〇 a-olefin is astm d-1238 condition L (2.16 kg, 230 ° 〇 Estimate MFR greater than approximately 25 依 according to the following calibration equation: MFR = 9x1018Mw~3 3584
Mw(每莫耳克重）為使用凝膠滲透層析儀測定。 15 200848457 用於本發明的全部摻合物亦包含密度聚乙烯(LDPE)。 用於本發明之較佳LDPE具有0.2至15g/10分鐘之熔融指數 (LX以ASTMD1238測定，條件為i9〇°C/2.16kg)。更佳的熔 融指數為大於約0.5 gHO分鐘。熔融指數較佳為少於約 5 10岁10分鐘，但在某些應用中可選擇地在0.4至7.5 10g/分鐘 間。較佳的LDPE亦具有一在0.915至0.930 g/cc範圍間的密 度(如依ASTM D792測定），較佳為在0_915至0.925 g/cc間。 較佳的LDPE亦具有一以凝膠滲透層析儀測定之3至13的 Mw/Mn 值。 10 此較佳的1〇1^可在此技術領域泛知的高壓釜或管狀 反應器中製造。 本發明之第二組份可亦包括LDPE/LDPE摻合物，例 如，摻合物中LDPE樹脂之一具有一相對較高熔融指數而另 一者具有一較低熔融指數且為較高度分支者。此具有較高 15熔融指數的組份可由管狀反應器獲得，且摻合物之一較低 MI、較高分支的組份可加至一獨立的擠壓步驟或使用與特 殊方法結合之平行管狀/高壓釜反應器以控制每一反應器 的熔融指數，如在回收流回收三聚體或加入新鮮的乙烯至 高壓爸(AC)反應器’或任何其他在此技術領域中已知的方 20 法。 適合用於製備本發明之擠壓組成物之高壓乙烯聚合物 組成物亦包括低密度聚乙烯(均聚物）、與至少一 α—烯烴例 如丁烯共聚化之乙烯、及與至少一 α，卢-烯化未飽和共聚單 體共聚化之乙烯，例如丙烯酸、甲基丙烯酸、曱基丙烯酸 16 200848457 醋及乙酸乙醋。一適合用於製備有用之高壓乙烯共聚物組 成物的技術述明於MCKinney等人之美國專利第4,599,392 號/專利之揭路併入本文參考。此些材料可適當的與 LDPE材料彳> a ’且通常提供所欲範圍上限的封合強度，使 5其較不欲用於可剝離之封合。 雖然咸信高壓乙烯均聚物及共聚物皆適用於本發明， 但通常以均聚物聚乙烯為佳。 本發明之組成物包含至少一丙烯系彈性體或塑性體 組份及-低密度聚乙烯聚合物。第二聚合物材料可包含所 1〇柿料^重量百分比。若需要低誠合起始温度，及/或 πη、、、黏著強度’其較佳包含少於總組成物約％百分比的聚 乙烯。 本發明之組成物特別適於藉由擠製塗層方法製造封合 層卿之封合層可以任何所欲的厚度製造，例如在丄微米 15 =3咖間。此封合物層可以一單層使用，但更典型為多層 結構的—層’例如—具_微米支撐層的1G微米封合物層。 /封合物層（特別是包含主要為PBPE的封合物層）在一 PP系的基材上共擠壓時，則整個結構為可回收的。 由本發明摻合物製造之可剝離封合具有2至10N/15mm '老化封。強度，較佳為2至麵5醜，該封合強度係在以 〇PP熱封合器於〇.5秒封合時間及0.5NW封合桿壓力下 +成的…封0上測疋。封合強度係在15麵寬之樣品老化至 > 24小時後以L1〇yds張力測試器於在機製方向以⑽①爪/分 鐘拉伸分離而測得。任一熟於此項技術人士需瞭解封合強 17 200848457 度基本上對撓性包裝為稍低但對剛性包裝為稍高。 本發明之可剝離封合具有一小於12〇〇c的熱封合起弘 温度，較佳為小於110 〇c，尤以小於刚。。為佳，最佳為】 於90 C。熱封合起始温度為獲得2N/15 mm封合強度的最】 温度’其係使用Kopp熱封合器於〇·5秒封合時間及〇 N/mm2封合桿壓力下形成的熱封合，該熱封合在熔接封合 24小時後以Lloyds拉力測試在10〇mm/分鐘拉伸而得。0 10 15 亦需瞭解本發明之組成物亦可含有多種在此技術領域 已知之添加劑。此些添加劑的範例包括抗氧化劑、紫外二 安定劑、熱安定劑、光滑劑，結塊齊卜顏料或著色劑光 處理助劑（如氟聚合物）、交聯催化劑、阻 " Λ、、、訓、填充劑、私 泡劑等。 a 下列實施例為用以進一步說明本發明。 實施例· 所有用於實施例中的樹脂之說明列示於表丨中。 表1 樹脂 說明 共聚單體 溶融指^^ (g/ΙΟ分鐘） A 高壓LDPE 無 2.3^^、 B PBPE 5百分比乙烯 C PBPE 9百分比乙烯 D EBPE(乙烯系塑性 體或彈性體） 辛烯 7.5 E 嵌段聚丙嫦共聚物 乙烯 -----^ * 使用 ASTM D-1238測定(2.16kg， 190°C) **使用人3丁厘〇-1238測定（2.16 1^，230。(：） 密度 蝻炫流動 8 _________~J -----— 25 ^ M76 ^25 ' 0.902 、—_ ^_〇,9 18 20 200848457 實施例1 完成一系列擠製塗層試驗及測量向内彎曲。使用之擠 製塗層線具有一寬度為8〇〇mm的平坦模。此模槽為 0.6mm。此總向内彎曲係藉由取得熱模表面的熱熔融寬度 5與基材上的塗層寬度間的差異而計算。此塗層重量為 25g/m2及使用一 290°C標準温度曲線於3.5英吋擠壓機。向内 彎曲在温度為290QC及線速度為100 m/分鐘與300 m/分鐘下 測量。 第1圖顯示70百分比樹脂C與30百分比樹脂A的摻合物/ 10 化合物之總向内彎曲在二線速度上顯著少於純樹脂D，因而 說明在擠製塗層方法上的改良可操作性。 實施例2 : 在厚度為15微米之定向聚丙烯(OPP)上於設定29〇〇c温 度曲線及100 m/分鐘線速度的擠壓機中以塗層密度25 g/m2 15 製備一系列塗層結構。此封合強度曲線的測定係以每次在 不同温度使用0.5 N/mm2壓力及靜置時間為〇·5秒下封合封 合物層本身，如第2圖曲線所示。此封合強度在形成封合的 24小時後測量。封合強度使用Lloyds拉力測試器於9〇。角在 衝頭速度為100 mm/分鐘下拉伸此封合。此結果說明於第2 20圖中。達到所欲之2 N/15mm封合強度的封合起始温度在 封合桿温度對樹脂D為78°C，但相對於70百分比樹脂c/3〇 百分比樹脂A為58°C，此說明本發明之組成物具較低封合起 始温度。 ϋ 實施例3 19 200848457 以塗層重量25 g/m2及100 m/分鐘線速度下於紙(60g/m2 牛皮紙)上製備一系列塗層結構。在不同温度使用〇·5 N/mm2 壓力及靜置時間為〇·5秒下封合封合物層本身，如第3圖曲 線所示。此熱黏著強度曲線在封合形成後立刻（0.2秒)使用 5 J&B熱黏著測試器3000於90°角在衝頭速度為200mm/分鐘 下拉伸此封合。 第3圖顯示在86°C達到所欲之1 N/15mm之熱黏著起始 温度在樹脂D為58°C，但相對於70百分比樹脂C/30百分比樹 脂A之摻合物為58°C。此樹脂D的熱黏著強度在160°C低於1 10 N/15 mm，同時樹脂C/樹脂A摻合物之熱黏著曲線在直到至 少150°C仍維持良好的高於1 N/15mm。並未測量樹脂C/樹脂 A摻合物於160°C及更高温度的數據，但其可安全地推定於 160°C及更高温度的熱黏著值將大於1 N/15mm。在任何情況 下其清楚可知本發明組成相對比較材料提供一較廣的熱黏 15 著處理温度窗。 實施例4 在雙定向聚丙烯（14微米厚度之BOPP)上於設定320°C 温度曲線及100 m/分鐘線速度的擠壓機中以塗層重量15 g/m2製備一系列塗層結構。此封合強度曲線的測定係以每 20次在不同温度使用0·5 N/mm2壓力及靜置時間為〇·5秒下封 合封合物層至50微米膜之1〇〇百分比的樹脂Ε，如第4圖曲線 所示。此封合強度在熔接封合的24小時後測量。封合強度 使用Lloyds拉力測試器於90。角在衝頭速度為丨〇〇 mm/分鐘 下拉伸此封合。此結果說明於第4圖中。 20 200848457 此70百分比樹脂C/30百分比樹脂A的摻合物於85°C至 160QC的温度範圍中獲得之封合強度值在2至6 N/15mm範 圍内。70百分比樹脂B/30百分比樹脂A的摻合物於95°C至 140°C的温度範圍中獲得之封合強度值在2至1〇 N/15mm範 5 圍内。此些比較優於以1 〇〇百分比均系分支化之LLDPE組份 (樹脂D)，其於125°C至160°C的温度範圍中呈現之封合強度 值在2至1〇 N/15mm範圍内。因此，本發明的材料非常適用 於可剝離之封合應用中。 【圏式簡單說明3 10 第1圖圖示在實施例1中二不同速度之擠製塗層生產線 上總向内彎曲數據的比較。 第2圖圖示在不同封合桿温度獲得之實施例2的封合於 24小時後測得的熱封合強度。 第3圖圖示在不同封合桿温度獲得之實施例3的封合後 15 立刻測得的熱黏著強度。 第4圖圖示在實施例4封合至5〇微米聚丙稀膜24小時後 於不同封合桿温度獲得測得的熱封合強度。 【主要元件符號說明】 (無） 21Mw (per molar weight) was determined using a gel permeation chromatograph. 15 200848457 All blends used in the present invention also comprise density polyethylene (LDPE). The preferred LDPE for use in the present invention has a melt index of from 0.2 to 15 g/10 minutes (LX is determined by ASTM D1238 under the conditions i9 〇 ° C / 2.16 kg). A more preferred melt index is greater than about 0.5 gHO minutes. The melt index is preferably less than about 5 10 years and 10 minutes, but may be optionally between 0.4 and 7.5 10 g/min in some applications. Preferred LDPE also has a density in the range of from 0.915 to 0.930 g/cc (as determined by ASTM D792), preferably between 0-915 and 0.925 g/cc. The preferred LDPE also has an Mw/Mn value of 3 to 13 as determined by gel permeation chromatography. 10 This preferred one can be made in an autoclave or tubular reactor well known in the art. The second component of the present invention may also include a LDPE/LDPE blend, for example, one of the LDPE resins in the blend has a relatively high melt index and the other has a lower melt index and is a higher degree branch. . This component having a higher 15 melt index can be obtained from a tubular reactor, and one of the blends having a lower MI, higher branching component can be added to a separate extrusion step or using a parallel tubular combination with a particular method. / autoclave reactor to control the melt index of each reactor, such as recovering trimer in the recycle stream or adding fresh ethylene to a high pressure dad (AC) reactor' or any other party known in the art. law. High pressure ethylene polymer compositions suitable for use in preparing the extruded compositions of the present invention also include low density polyethylene (homopolymer), ethylene copolymerized with at least one alpha olefin such as butene, and at least one alpha, Ethylene copolymerized with an ethylenically unsaturated comonomer, such as acrylic acid, methacrylic acid, methacrylic acid 16 200848457 vinegar and ethyl acetate. A technique suitable for the preparation of a useful high-pressure ethylene copolymer composition is described in U.S. Patent No. 4,599,392, issued toK. Such materials may suitably be combined with the LDPE material > a ' and generally provide a seal strength at the upper end of the desired range such that it is less desirable for use in a peelable seal. Although both high-pressure ethylene homopolymers and copolymers are suitable for use in the present invention, homopolymer polyethylene is preferred. The composition of the present invention comprises at least one propylene-based elastomer or plastomer component and a low-density polyethylene polymer. The second polymeric material may comprise a percentage by weight of the persimmon. If a low-initial starting temperature is desired, and/or πη,,, adhesion strength, it preferably comprises less than about a percent of the total composition of the polyethylene. The composition of the present invention is particularly suitable for making the seal layer of the seal layer by the extrusion coating process at any desired thickness, for example, between 丄 micrometers 15 = 3 coffee. The seal layer can be used in a single layer, but is more typically a multi-layered layer - e.g., a 1 G micro-seal layer with a -micron support layer. When the /sealing layer (especially a sealing layer comprising predominantly PBPE) is coextruded on a PP based substrate, the entire structure is recyclable. The peelable seal made from the blend of the invention has a 2 to 10 N/15 mm 'aging seal. The strength is preferably from 2 to 5 ug., and the sealing strength is measured by a 〇PP heat sealer at a sealing time of 0.5 seconds and a pressure of 0.5 NW of the sealing rod. The seal strength was measured by aging at > 15 hrs after 24 hours with a L1 〇 yds tensile tester in the direction of the mechanism at (10) 1 jaw/minute stretch separation. Anyone familiar with this technology needs to know that the seal is strong 17 200848457 degrees is basically slightly lower for flexible packaging but slightly higher for rigid packaging. The peelable seal of the present invention has a heat seal initiation temperature of less than 12 〇〇c, preferably less than 110 〇c, especially less than just. . Best, the best is at 90 C. The heat sealing initiation temperature is the highest temperature at which the sealing strength of 2N/15 mm is obtained. The heat sealing is formed by using a Kopp heat sealer at a sealing time of 5 seconds and a pressure of 〇N/mm2 of the sealing rod. The heat seal was obtained by stretching at 10 〇mm/min using a Lloyds pull test after 24 hours of fusion sealing. It is also to be understood that the compositions of the present invention may also contain a variety of additives known in the art. Examples of such additives include antioxidants, UV stabilizers, thermal stabilizers, smoothing agents, agglomerated pigments or coloring agents, photo-processing aids (such as fluoropolymers), cross-linking catalysts, resistance " , training, fillers, blistering agents, etc. a The following examples are intended to further illustrate the invention. EXAMPLES All descriptions of the resins used in the examples are shown in the Tables. Table 1 Resin description Copolymer monomer melting refers to ^^ (g / ΙΟ min) A High pressure LDPE No 2.3 ^ ^, B PBPE 5 percentage Ethylene C PBPE 9 percentage Ethylene D EBPE (ethylene plastomer or elastomer) Octene 7.5 E Block Polypropylene Copolymer Ethylene-----^ * Determined using ASTM D-1238 (2.16 kg, 190 ° C) **Measured using 3 butyl guanidin-1238 (2.16 1^, 230. (:) density蝻炫流8 _________~J ----- 25 ^ M76 ^25 ' 0.902 , —_ ^ _ 〇 , 9 18 20 200848457 Example 1 Complete a series of extrusion coating tests and measure inward bending. The extruded coating line has a flat die having a width of 8 mm. The cavity is 0.6 mm. This total inward bending is achieved by taking the hot melt width 5 of the hot mold surface and the coating width on the substrate. Calculated by the difference. The coating weight is 25g/m2 and uses a standard temperature profile of 290 ° C in a 3.5 inch extruder. Inward bending at a temperature of 290 QC and a line speed of 100 m / min and 300 m / min The next measurement shows the total inward bending of the blend of 70% resin C and 30% resin A / 10 compound at the second speed Significantly less than pure resin D, thus indicating improved operability in the extrusion coating process. Example 2: Setting a temperature profile of 29 ° C and 100 m on oriented polypropylene (OPP) having a thickness of 15 μm A series of coating structures were prepared at a coating speed of 25 g/m2 15 in a linear speed extruder. The sealing strength curve was determined by using 0.5 N/mm 2 pressure and standing time at different temperatures each time.封·5 seconds to seal the seal layer itself, as shown in the curve of Figure 2. This seal strength was measured 24 hours after the seal was formed. The seal strength was measured using a Lloyds pull tester at 9 〇. The seal was stretched at a head speed of 100 mm/min. This result is illustrated in Figure 20 20. The seal initiation temperature to achieve the desired 2 N/15 mm seal strength is at the seal bar temperature for resin D. 78 ° C, but with respect to 70% resin c / 3 〇 Percent Resin A is 58 ° C, which means that the composition of the present invention has a lower sealing initiation temperature. 实施 Example 3 19 200848457 Coating weight 25 g Prepare a series of coating structures on paper (60g/m2 kraft paper) at /m2 and 100 m/min line speed. The sealing layer itself was sealed with 〇·5 N/mm2 pressure and standing time for 5·5 seconds, as shown in the graph of Figure 3. This thermal adhesion strength curve was used immediately after sealing (0.2 seconds). 5 J&B Thermal Adhesion Tester 3000 was stretched at a 90° angle at a punch speed of 200 mm/min. Figure 3 shows that the desired thermal adhesion initiation temperature of 1 N/15 mm at 86 ° C is 58 ° C at Resin D, but 58 ° C with respect to 70% Resin C / 30% Resin A. . The heat adhesion strength of this resin D was lower than 1 10 N/15 mm at 160 ° C, and the thermal adhesion curve of the resin C/resin A blend maintained well above 1 N/15 mm up to at least 150 °C. The resin C/resin A blend was not measured at 160 ° C and higher, but it is safe to assume that the thermal adhesion at 160 ° C and higher will be greater than 1 N / 15 mm. In any event, it will be apparent that the composition of the present invention provides a relatively wide thermal bond processing temperature window relative to the comparative material. Example 4 A series of coating structures were prepared on a biaxially oriented polypropylene (14 micron thick BOPP) in an extruder set to a 320 ° C temperature profile and a line speed of 100 m/min at a coating weight of 15 g/m 2 . The seal strength curve was determined by sealing the sealant layer to a 50 μm film at a temperature of 0·5 N/mm 2 and a standing time of 〇·5 seconds every 20 times. Resin enthalpy, as shown in the curve in Figure 4. This seal strength was measured 24 hours after the fusion sealing. Seal strength Use the Lloyds pull tester at 90. The corner is stretched at a punch speed of 丨〇〇 mm/min. This result is illustrated in Figure 4. 20 200848457 This 70% resin C/30 percent resin A blend has a seal strength value in the range of 2 to 6 N/15 mm obtained in the temperature range of 85 ° C to 160 QC. The blend of 70% resin B/30 percent Resin A obtained a seal strength value in the range of 2 to 1 〇 N/15 mm in the temperature range of 95 ° C to 140 ° C. These comparisons are superior to the LLDPE component (resin D) which is branched at a percentage of 1 〇〇, which exhibits a seal strength value of 2 to 1 〇N in the temperature range of 125 ° C to 160 ° C. /15mm range. Therefore, the materials of the present invention are well suited for use in peelable sealing applications. [Simple description 3 10 Figure 1 illustrates a comparison of the total inward bending data on the extrusion coating line at two different speeds in Example 1. Figure 2 is a graph showing the heat seal strength measured after 24 hours of sealing of Example 2 obtained at different seal bar temperatures. Figure 3 is a graph showing the thermal adhesion strength measured immediately after sealing of Example 3 obtained at different seal bar temperatures. Figure 4 is a graph showing the measured heat seal strength at different seal bar temperatures after 24 hours of sealing to Example 5 of a 5 Å micron polypropylene film. [Main component symbol description] (none) 21