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WO2012071633A1 - Procédé de production d'un film et film - Google Patents

Procédé de production d'un film et film Download PDF

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Publication number
WO2012071633A1
WO2012071633A1 PCT/BR2010/000407 BR2010000407W WO2012071633A1 WO 2012071633 A1 WO2012071633 A1 WO 2012071633A1 BR 2010000407 W BR2010000407 W BR 2010000407W WO 2012071633 A1 WO2012071633 A1 WO 2012071633A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
ldpe
films
process according
additives
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.)
Ceased
Application number
PCT/BR2010/000407
Other languages
English (en)
Portuguese (pt)
Inventor
Paulo Haipek Filho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to PCT/BR2010/000407 priority Critical patent/WO2012071633A1/fr
Publication of WO2012071633A1 publication Critical patent/WO2012071633A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
    • C08L23/0815—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2314/00—Polymer mixtures characterised by way of preparation
    • C08L2314/06—Metallocene or single site catalysts

Definitions

  • the present invention relates to the technical sector of film and plastic bag production.
  • WO2008074493 is directed to the production of uniaxially oriented films comprising a layer (A) and a layer (B).
  • Layer (A) comprising linear low density polyethylene (PELBD) comprising multimodal PELBD produced by Ziegler Natta catalyst (PELBDzn), or multimodal PELBD, or a combination of both.
  • Layer (B) comprising multimodal PELBD.
  • Multilayer film being a stretched film that is oriented uniaxially at a ratio of at least 1: 3.
  • WO2008074492 is aimed at producing a film useful for storing light (under 5kg) and heavy (over 50kg) products useful as bags.
  • a film is a uniaxially oriented film comprising at least one outer layer (B) and one inner layer (C).
  • Layer (B) comprising a multimodal PELBD.
  • the layer (C) comprising at least one polymer component with a melting point below 100 ° C.
  • Multilayer film is a uniaxially oriented movie in a 1: 3 ratio.
  • WO2006037603 aims at producing a useful film for packaging.
  • Said film having 3 or more layers, 2 outer layers and 1 central layer.
  • the outer layer comprising PELBD and the central layer comprising multimodal polyethylene having low and high molecular weight components.
  • Said film has good processability and mechanical properties.
  • the films of the art to a greater or lesser extent, have too high film thicknesses (mainly due to processing needs) for use in storing light products such as bread and diapers. Additionally these films have very low transverse breaking forces. A better comparison between films in the art and films obtained by the present patent application can be seen in the attached examples.
  • the present invention aims to enable an economically viable plastic film manufacturing process, allowing significant reduction of raw material used and at the same time solves several of the drawbacks encountered in the art.
  • the present invention circumvents several of the drawbacks of the art by combining a suitable formulation of the extruded or coextruded raw materials with the longitudinal orientation process of the extruded films.
  • Such formulation coupled with a specific condition of longitudinal orientation of the polymer chains in the plastic film, in addition to increasing the The modulus of elasticity of the orientation oriented film reduces the characteristic losses of the longitudinal orientation process making the films thus obtained commercially viable, especially considering that the single oriented films can greatly reduce the thickness of the films currently employed.
  • the longitudinal orientation process in general can reduce the mechanical properties of the stretched film in the transverse direction, a problem which is overcome in the present invention by the combination of the formulation employed and the longitudinal stretching conditions.
  • Said process consists of a mixture of LDPE, PELBD (preferably metallocene PELBD, PELBDm) and balloon-type extruded additives with a blowing ratio in the range 1: 2 to 1: 3.5 and mono-oriented with the film being stretched. longitudinally in a ratio of 1: 2 to 1: 4, resulting in a product with adequate mechanical strength, processable in printers and cutting and welding machines and in conventional wrappers, and at the same time has the side edge losses reduced to levels that enable the production of various films intended for various packaging processes of low density products.
  • PELBD preferably metallocene PELBD, PELBDm
  • Fig. 1 shows a schematic view of a single orientation machine of an extruded film
  • the present invention relates to a formulation in combination with a process for the production of films made from polyolefins and intended for the manufacture of bags and envelopes used in the packaging of foodstuffs or not.
  • plastic film is understood to include monolayer extruded plastic films or 3 or more layer coextruded plastic films or 3 or more layer coextruded or extruded plastic films made from the balloon process and from blends of low density polyethylenes and linear low density metallocene polyethylenes which may or may not contain additives.
  • the monorientation process can be understood in general terms as shown by fig. 1 attached, which schematically demonstrates the mono-orientation process of plastic films commonly found in the art:
  • a preheated plastic film of width "LI” and thickness "el” is driven through a pair of heated rollers A-B rotating at angular velocity w1;
  • the film After passing through the R-S roll assembly the film enters a second heated T-U roll assembly that rotates at an angular velocity w2 greater than wl.
  • the ratio w2 / wl is called, in the art, the overflow rate and can be calculated also by the ratio V2 / V1;
  • film narrows shown in the figure by the difference between the original film width (LI) and film width after passing through the second roll assembly (L2));
  • the present invention achieves the reduction of the amount of raw material used in the plastic film production process considerably, and drastically decreasing the characteristic losses of single orientation.
  • the innovation lies in the fact that it occurs unexpectedly, and contrary to the teachings found in the art, that a process that utilizes low stretch rates in combination with a composition that minimizes the losses of the stretched film side, can enable the production of plastic films with reduction of raw materials in ranges close to 50%, with the films commonly found in the art, and still get a product that is suitable for future processing.
  • Said extrusion may occur in monolayer or multilayer form, depending on the preferences in the final film.
  • the following ranges can be found in Table 1 of the accompanying examples and demonstrate preferred embodiments and compositions used in the present invention.
  • Said process utilizes raw material (Table 1) extruded in single-layer balloon-type extruders or, in 3, 5 or more balloon-type coextruders, using a blowing ratio in the range 1: 2 to 1: 3, 5 or, preferably in the range of 1: 2.5 to 1: 3.0 and dies with lip opening between 1.6mm to 2.8mm or, preferably with lip opening between 1.8mm to 2.4mm.
  • the formulations of each layer may always be changed using the same raw materials. This change in formulation may occur in the ratio of LDPE to PELBDm of each layer and preferably in the additive with AB (anti-blocking additive), sliding additives, nucleating agents, color concentrates and antistatic agents among others.
  • the process proceeds to the single orientation step, wherein said film is stretched longitudinally at a ratio of 1: 2 to 1: 4 and preferably stretch ratios of less than 1: 3 are thus imparting suitable mechanical properties for processing. backing of the plastic film and decreasing the thickness of the film.
  • the final thickness of mono-oriented film may vary from 10 to 50 ⁇ ⁇ depending on end use requirements and its mechanical characteristics are quite suitable for future processing as well as for storing lightweight materials.
  • said extruded film may contain more than 5 layers, and will be protected by the present invention as long as it is obtained from the teachings of this report.
  • additives may be added to the formulation to impart specific properties to the final film.
  • additives may be selected from the group consisting of at least one of: nucleating agents, color concentrates, nanoparticles, antistatic agents, active agents (such as oxygen absorbers).
  • Sliding additives are additives prepared from unsaturated fatty acid amides, particularly oleamides, stearamides and erucamides. These sliding materials are pre-dispersed in a base raw material (typically low density polyethylene) in a proportion of 5% to 10% to allow easy use during the film extrusion process.
  • concentrations of 200 ppm to 2000 ppm are required depending on the film thickness and the desired coefficient of friction.
  • Anti-blocking (anti-blocking or AB) additives are additives prepared using natural silica dispersed in a polymeric carrier suitable for extrusion of the end product.
  • a polymeric carrier suitable for extrusion of the end product.
  • the suitable carrier is polypropylene
  • polyethylene films the choice will be made of a polyethylene and so on.
  • the silica concentrations found in the compounds vary, generally from 5% and 20% and the choice of concentration will depend on several factors that must be evaluated in view of their manufacturing processes, equipment and desired end results.
  • Natural silicas with different particle sizes are available and anti-blocking additives can be made from single-particle silica or by using a combination of two or more different particle sizes.
  • multilayer film formulations may indicate greater use of the additives in the outer and lower layers in order to reduce the cost of the film, as in the case of AB, for example, they act only on the surface of the films. , and thus would be unnecessary in the inner layers, where their use would only increase the cost of the final film without any benefit to the film.
  • extruded films with more than one layer would have the advantage of being able to reduce the amount of additives that would be used in the film, as these would only be employed in the layers where they are really needed and need not be applied to the layers where their use is. making this process even more economical.
  • LDPE - Molecular weight is between 35,000 and
  • PELBD - The molecular weight is between 200,000 and 500,000 and typically preferably 350,000.
  • PELBDm The molecular weight of linear metallocene low density polyethylene ranges from 600,000 to 900,000.
  • PELBDm occurs because of its characteristic mechanical properties (especially those of tear and puncture resistance) which are not appreciably altered by the single orientation process under the conditions described in this patent application.
  • the films and plastic bags produced by the knowledge introduced in this patent application are used for the storage of lightweight (low bulk density) products such as toilet papers, napkins, breads, diapers, sanitary napkins and the like.
  • lightweight (low bulk density) products such as toilet papers, napkins, breads, diapers, sanitary napkins and the like.
  • similar products are to be understood as products with an apparent density of less than 0.6.
  • Table 1 presents some preferred formulations of the present invention.
  • Equipment matrix used is 400mm and with 2.2mm lip opening. Inflation ratio of 1: 2.3.
  • Equipment matrix used is 400mm and with 2.2mm lip opening. Insufflation ratio of 1: 2.6; Monorientation of a 53 ⁇ film on a Hosokawa Alpine monorientation machine with a 1: 2, 65 stretch ratio.
  • Equipment matrix used is 400mm and with 2.2mm lip opening. Insufflation ratio of 1: 2.6;
  • Film 5 (3 layers) Film produced by knowledge disclosed by patent application WO2006037603 and corresponding to film 1 of said application.
  • composition was coextruded in 3 layers and with a final diameter of 40 ⁇ m. (detailed process see reference)

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne une formulation et un procédé de production de films et/ou de sacs utilisés pour l'emballage de produits. La formulation comprend du PEBD, du PELBD métallocène et des additifs.
PCT/BR2010/000407 2010-12-03 2010-12-03 Procédé de production d'un film et film Ceased WO2012071633A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/BR2010/000407 WO2012071633A1 (fr) 2010-12-03 2010-12-03 Procédé de production d'un film et film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BR2010/000407 WO2012071633A1 (fr) 2010-12-03 2010-12-03 Procédé de production d'un film et film

Publications (1)

Publication Number Publication Date
WO2012071633A1 true WO2012071633A1 (fr) 2012-06-07

Family

ID=46171108

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2010/000407 Ceased WO2012071633A1 (fr) 2010-12-03 2010-12-03 Procédé de production d'un film et film

Country Status (1)

Country Link
WO (1) WO2012071633A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003093A1 (fr) * 1991-07-18 1993-02-18 Exxon Chemical Patents Inc. Article thermosoude
WO1995013321A1 (fr) * 1993-11-12 1995-05-18 Exxon Chemical Patents Inc. Films thermosoudables et articles obtenus a partir de ceux-ci
US5885707A (en) * 1995-09-25 1999-03-23 Wolff Walsrode Ag Sealable laminated film containing copolymers produced with metallocene catalysts
US6368545B1 (en) * 1999-05-13 2002-04-09 Exxonmobil Chemical Patents Inc. High clarity polyolefin multilayer blown coextruded film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003093A1 (fr) * 1991-07-18 1993-02-18 Exxon Chemical Patents Inc. Article thermosoude
WO1995013321A1 (fr) * 1993-11-12 1995-05-18 Exxon Chemical Patents Inc. Films thermosoudables et articles obtenus a partir de ceux-ci
US5885707A (en) * 1995-09-25 1999-03-23 Wolff Walsrode Ag Sealable laminated film containing copolymers produced with metallocene catalysts
US6368545B1 (en) * 1999-05-13 2002-04-09 Exxonmobil Chemical Patents Inc. High clarity polyolefin multilayer blown coextruded film

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