ES2490717T3 - Películas de alta claridad y alta rigidez - Google Patents

Películas de alta claridad y alta rigidez Download PDF

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Publication number
ES2490717T3
ES2490717T3 ES03749043.0T ES03749043T ES2490717T3 ES 2490717 T3 ES2490717 T3 ES 2490717T3 ES 03749043 T ES03749043 T ES 03749043T ES 2490717 T3 ES2490717 T3 ES 2490717T3
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film
ldpe
density polyethylene
clarity
films
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Jose V. Saavedra
Rajen Patel
Varun Ratta
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Dow Global Technologies LLC
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Dow Global Technologies LLC
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2009/00—Use of rubber derived from conjugated dienes, as moulding material
    • B29K2009/06—SB polymers, i.e. butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0625—LLDPE, i.e. linear low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/256—Sheets, plates, blanks or films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/91—Product with molecular orientation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y10T428/31917—Next to polyene polymer

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A Una película soplada en caliente coextruida con al menos tres capas, comprendiendo la película una capa de núcleo intercalada entre dos capas externas, teniendo la película un valor de turbidez de menos del 15 %, un módulo secante al 2% mayor de 350 MPa (50.000 psi) y una retracción en la dirección transversal (CD) mayor del 0 %, en donde: a. la capa del núcleo se selecciona del grupo que consiste en polietileno de alta densidad con una densidad de 0,941 g/cm3 a 0,965 g/cm3, una mezcla de polietileno de baja densidad y polietileno de alta densidad con una densidad de 0,941 g/cm3 a 0,965 g/cm3, y copolímero de cíclico-olefina; y, b. las capas externas, que pueden ser iguales o diferentes, se seleccionan del grupo que consiste en polietileno de baja densidad, copolímero de cíclico-olefina, y copolímero aleatorio de polipropileno, a condición de que las capas externas estén desprovistas de resina de polietileno homogéneamente ramificado preparado con un catalizador de sitio único.

Description

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E03749043
08-08-2014
largo" ) se analiza en la columna 1; Documento USP 5.284.613 y W.D. Harris, et al en "Effects of Bubble Cooling on Performance and Properties of HMW-HDPE Film Resins", Polymers, Laminations & Coatings Conference, Libro 1, 1.990, páginas 306-317 y Moore, E.P., Polypropylene Handbook, Hanser, Nueva York, 1.996, páginas 330-332.
En la formación de películas sopladas, un material fundido entra a una boquilla con forma de anillo bien por la parte inferior o por el lateral de la boquilla. El material fundido se fuerza a través de surcos helicoidales alrededor de la superficie de un mandril dentro de la boquilla y se extruye a través de la abertura de la boquilla como un tubo de pared gruesa. El tubo se expande en una burbuja del diámetro deseado y el espesor correspondientemente disminuido como se describió previamente.
La formación de las películas sopladas coextruidas se conoce en la técnica y es aplicable a la presente invención. Los artículos ilustrativos de la técnica incluyen Han y Shetty, "Studies on Multilayer Film Coextrusion III. The Rheology of Blown Film Coextrusion," Polymer Engineering and Science, Febrero, (1978), vol. 18, No. 3, páginas 187-199; y Morris, "Peel Strength Issues in the Blown Film Coextrusion Process," 1996 Polymers, Laminations & Coatings Conference, TAPPI Press, Atlanta, Ga. (1996), páginas 571-577. El término "coextrusión" se refiere al procedimiento de extruir dos o más materiales a través de una sola boquilla con dos o más orificios dispuestos de modo tal que los extruidos se fusionen en una estructura laminar, preferiblemente antes de enfriar o templar. Los sistemas de coextrusión para preparar películas de múltiples capas emplean al menos dos extrusoras que alimentan a un ensamblaje de boquilla común. La cantidad de extrusoras depende de la cantidad de materiales diferentes que comprenden la película coextruida. Para cada material diferente, ventajosamente se usa una extrusora diferente. Por lo tanto, una coextrusión de cinco capas puede requerir hasta cinco extrusoras, aunque se pueden usar menos si dos o mas de las capas están hechas del mismo material.
Las boquillas de coextrusión se usan para conformar películas sopladas coextruidas. Tienen múltiples mandriles que alimentan las diferentes corrientes de masa fundida al reborde circular de la boquilla. Cuando se emplean bloques de alimentación para apilar las capas de material fundido de dos o más extrusoras, la corriente de material fundido de múltiples capas resultante se alimenta luego a la boquilla de la película.
Una característica distintiva de la presente invención es la falta de post-biorientación, tal como la orientación por doble burbuja o por tensor-bastidor.
La prueba de la retracción se lleva a cabo por inmersión en un baño de aceite caliente mantenido a una temperatura de al menos 10 °C por encima del punto de fusión de la capa de mayor punto de fusión durante al menos 30 segundos.
EJEMPLOS
Las siguientes resinas se usaron en la producción de las películas de los Ejemplos.
LDPE 501I
Un LDPE de grado de claridad con un índice de fusión, I2, de 1,90 g/10 min (medido por la norma ASTM D-1238), una densidad de 0,922 g/cm3 (medida por la norma ASTM D-792), disponible de The Dow Chemical Co.
LDPE 136S
Un LDPE de grado de claridad con un índice de fusión, I2, de 0,25 g/10 min (medido por la norma ASTM D-1238), una densidad de 0,922 g/cm3 (medida por la norma ASTM D-792), disponible de The Dow Chemical Co.
LDPE 170A
Un LDPE de grado de claridad con un índice de fusión, I2, de 0,70 g/10 min (medido por la norma ASTM D-1238) y una densidad de 0,9235 g/cm3 (medida por la norma ASTM D-792), disponible de The Dow Chemical Co.
LDPE 662I
Un LDPE de grado de claridad con un índice de fusión, I2, de 0,50 g/10 min (medido por la norma ASTM D-1238) y una densidad de 0,919 g/cm3 (medida por la norma ASTM D-792), disponible de The Dow Chemical Co.
Dowlex 2038
Un LLDPE de grado de claridad con un índice de fusión, I2, de 1,0 g/10 min (medido por la norma ASTM D-1238) y una densidad de 0,935 g/cm3 (medida por la norma ASTM D-792), disponible de The Dow Chemical Co.
Dowlex 2049AC
Un LDPE con un índice de fusión, I2, de 1,0 g/10 min (medido por la norma ASTM D-1238) y una densidad de 0,926 g/cm3 (medida por la norma ASTM D-792), disponible de The Dow Chemical Co.
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E03749043
08-08-2014
Ejemplos 5, 8 y 10, Ejemplos Comparativos 6, 7 y 9 y Muestra Comparativa L
Se produjeron películas de 5 capas de alta claridad y alta rigidez en una línea de película soplada de coextrusión convencional y sin post-biorientación. Todas las películas tenían una estructura de película A/B/C/B/A. Las capas de las películas tenían los componentes y porcentajes (con respecto al espesor total de la película) como se muestra en la Tabla II. Todas las películas tenían un espesor total de 38,1 µm (1,5 milésimas de pulgada).
Como se muestra en la Tabla II, los Ejemplos 5-10 ilustran que se pueden hacer películas de alta claridad y alta rigidez por medio de la presente invención sin recurrir a procesos de post-biorientación.
Tabla II: Resultados de la película de 5 capas de alta claridad y alta rigidez.
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imagen8 imagen9 imagen10 imagen11 imagen12 imagen13 Retracción Retracción Retracción, % Retracción, %
Número de Ejemplo
A=Externa / % del espesor total B=Interna / % del espesor total C=Núcleo / % del espesor total BUR Turbidez Módulo secante al 2 % Tensión 150 C (MD) Tensión 150 C (CD) 150 °C Promedio (MD) 150 °C Promedio (CD)
5
LDPE 501I / 10 % LDPE 136S / 20 % HDPE DEGD 1059 / 40 % 2,5 10,67 434,4 (62058) 16,4 muy baja 79,8 14,4
CS L
LDPE 501I / 10 % LDPE 136S / 20 % PP DS 6D82 / 40 % 2,5 7,50 321,6 (45939) 18,4 muy baja 81,05 29,1
Comparativo 6
PP DS 4D05 / 10 % LDPE 136S / 30 % PP DS 4D05 / 20 % 3,6 4,54 437,1 (62438) 23,6 muy baja 81,8 54,7
Comparativo 7
PP DS 6D82 / 10 % LDPE 6621 / 30 % PP DS 6D82 / 20 % 3,6 7,86 375 (53565) 20,0 muy baja 82,05 38,7
Comparativo 8
PP DS 6D82 / 10 % LDPE 136S / 30 % Topas 8007 / 20 % 3,6 7,99 954,6 (136365) 25,4 13,6 73,9 40,7
Comparativo 9
PP DS 6D82 / 10 % LDPE 136S / 30 % K-resin / 20 % 3,6 6,75 415,9 (59412) 23,8 8,5 72,9 51,3
10
PP DS 6D82 / 10 % LDPE 136S / 30 % Topas 8007 / 20 % 3,6 6,77 894,5 (127784) 24,9 13,2 75,15 41,6
10 Los porcentajes de capa son para cada capa y son valores objetivo.
Los Ejemplos 8 y 10 son iguales, excepto en la relación real de la capa debido al cambio en las rpm del tornillo de la extrusora. Como resultado, el espesor del núcleo en el Ejemplo 10 es menor que en el Ejemplo 8.
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Claims (1)

  1. imagen1
ES03749043.0T 2002-09-16 2003-08-14 Películas de alta claridad y alta rigidez Expired - Lifetime ES2490717T3 (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US41109202P 2002-09-16 2002-09-16
US411092P 2002-09-16
PCT/US2003/025395 WO2004024433A2 (en) 2002-09-16 2003-08-14 High clarity, high stiffness films

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ES2490717T3 true ES2490717T3 (es) 2014-09-04

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US (1) US8092920B2 (es)
EP (1) EP1539489B1 (es)
JP (1) JP4495590B2 (es)
KR (1) KR101092056B1 (es)
CN (1) CN1681650B (es)
AU (1) AU2003268092A1 (es)
BR (1) BR0314444B1 (es)
ES (1) ES2490717T3 (es)
MX (1) MXPA05002885A (es)
WO (1) WO2004024433A2 (es)

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BR0314444A (pt) 2005-07-19
CN1681650A (zh) 2005-10-12
US8092920B2 (en) 2012-01-10
CN1681650B (zh) 2010-12-29
WO2004024433A2 (en) 2004-03-25
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US20060057410A1 (en) 2006-03-16
JP2005538867A (ja) 2005-12-22

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