FR2691436A1 - Stretch cling film for food packaging - made by extrusion of a mixt. of a styrene]-butadiene]-styrene] copolymer and a sequenced styrene]-butadiene] copolymer - Google Patents

Stretch cling film for food packaging - made by extrusion of a mixt. of a styrene]-butadiene]-styrene] copolymer and a sequenced styrene]-butadiene] copolymer Download PDF

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Publication number
FR2691436A1
FR2691436A1 FR9206320A FR9206320A FR2691436A1 FR 2691436 A1 FR2691436 A1 FR 2691436A1 FR 9206320 A FR9206320 A FR 9206320A FR 9206320 A FR9206320 A FR 9206320A FR 2691436 A1 FR2691436 A1 FR 2691436A1
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FR
France
Prior art keywords
styrene
copolymer
butadiene
extrusion
good
Prior art date
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Withdrawn
Application number
FR9206320A
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French (fr)
Inventor
Martin Villarrubia Bernabe
Hennia Hadj
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Individual
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Individual
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Publication date
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Priority to FR9206320A priority Critical patent/FR2691436A1/en
Publication of FR2691436A1 publication Critical patent/FR2691436A1/en
Withdrawn legal-status Critical Current

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    • 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
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • 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
    • C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2353/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes

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

Abstract

Stretch cling film with good optical and mechanical properties is made by blown extrusion through an annular die or flat extrusion through a slit die of a mixt. of (a) 5-50 wt. % of a styrene-butadiene-styrene copolymer and (b) 50-95 wt. % of a sequenced styrene-butadiene copolymer, the copolymer(s) (a) and (b) having a density of 0.950-1.01 g/cm3. Pref. the copolymer mixt. contains 8-15 (esp. 25-40) wt. % of component (a). The film is pref. 10-40 micrometres thick. USE/ADVANTAGE - The films have good optical and mechanical properties, good stretch characteristics, good autoadhesive properties by way of the rubber effect, good permeability and freedom from residual deformation. The prods. have good machine application characteristics and are esp. useful for packaging food prods. currently packaged in PVC film.

Description

La présente invention concerne un film étirable alimentaire autoadhésif par effet caoutchoutique ayant de bonnes caractéristiques optiques et mécaniques, sans déformation résiduelle, obtenu par extrusion d'un mélange de
copolymère styrène-butadiène-styrène et de copolymère séquencé styrène
butadiène, composé de la façon suivante:
a) de 5 à 50 % en poids de copolymère styrène-butadiène-styrène et
b) de 50 à 95 to en poids de copolymère séquencé styrène-butadiène,
ces copolymères ayant une densité de 0,950 à 1,01 g/cm3.The present invention relates to a self-adhesive food stretch film by rubber effect having good optical and mechanical characteristics, without residual deformation, obtained by extrusion of a mixture of
styrene-butadiene-styrene copolymer and styrene block copolymer
butadiene, composed as follows:
a) from 5 to 50% by weight of styrene-butadiene-styrene copolymer and
b) from 50 to 95% by weight of styrene-butadiene block copolymer,
these copolymers having a density of 0.950 to 1.01 g / cm3.

De préférence, le composant a) est présent dans le mélange à raison de
25 à 40 % en poids, et de préférence encore à raison de 8 à 15 % en poids. Le film
obtenu peut avoir une épaisseur de 10 à 40 zm. Preferably, component a) is present in the mixture at a rate of
25 to 40% by weight, and more preferably 8 to 15% by weight. The film
obtained can have a thickness of 10 to 40 zm.

Ce film permet d'emballer des produits alimentaires et de grande consommation qui actuellement sont conditionnés sous film PVC. This film is used to package food and consumer products which are currently packaged in PVC film.

Les caractéristiques techniques de ce film sont les suivantes:
a) de bonnes qualités optiques,
b) une bonne perméabilité,
c) une grande étirabilité,
d) une bonne usinabilité,
e) aucune déformation résiduelle.The technical characteristics of this film are as follows:
a) good optical qualities,
b) good permeability,
c) high stretchability,
d) good machinability,
e) no residual deformation.

Ce film peut être obtenu par extrusion-soufflage : filière annulaire c par extrusion de feuille à plat : filière plate. This film can be obtained by extrusion-blowing: annular die c by flat sheet extrusion: flat die.

DONNEES TECHNIQUES RELATIVES AU MELANGE: COPOLYMèRE STYRENE-BUTADIENE-STYRENE :
Densité (g/cm3) : 1,01
Indice de fusion (g/10 min) : 13 (DIN 53735)
VICAT VST/B/50 ( C) : 60 (DIN 53460)
Résistance à la traction (N/mm2) : 26 (DIN 52455)
Allongement à la rupture (No) :250 (DIN 52455)
Copolymère séquencé styrène-butadiène:
Densité (g/cm3) :0,95
Indice de fusion (g/10 min) : 190'C 2160 kp (ASTM-E) 2,6
Viscosité :28/30 CARACTERISOUES D'EXTRUSION:
Si on utilise 40 % en poids du mélange du copolymère a) et 60 % du copolymère b), il faut une température d'extrusion, par vis hélicoïdale, de 200 C, pour obtenir une bonne homogénéisation.TECHNICAL DATA RELATING TO THE MIXTURE: STYRENE-BUTADIENE-STYRENE COPOLYMER:
Density (g / cm3): 1.01
Melting index (g / 10 min): 13 (DIN 53735)
VICAT VST / B / 50 (C): 60 (DIN 53460)
Tensile strength (N / mm2): 26 (DIN 52455)
Elongation at break (No): 250 (DIN 52455)
Styrene-butadiene block copolymer:
Density (g / cm3): 0.95
Melting index (g / 10 min): 190'C 2160 kp (ASTM-E) 2.6
Viscosity: 28/30 EXTRUSION CHARACTERISTICS:
If 40% by weight of the mixture of the copolymer a) and 60% of the copolymer b) are used, an extrusion temperature, by helical screw, of 200 ° C. is required to obtain good homogenization.

Le mélange ainsi homogénéisé permet une production de 90 kg/h pour une vitesse d'enroulement de 40 m/min. The mixture thus homogenized allows a production of 90 kg / h for a winding speed of 40 m / min.

A la sortie de la filière, le film est refroidi par air à une température. de 15'C. At the exit of the die, the film is air-cooled to a temperature. 15'C.

Le rapport du taux de gonflage est de 1 : 2,5. The ratio of the inflation rate is 1: 2.5.

Le film ainsi obtenu, par extrusion-soufflage, est d'une épaisseur de 15In.  The film thus obtained, by extrusion blow molding, has a thickness of 15 In.

CARACTERISTIOUES DU FILM:
(Indice de fusion) (g/10 min) : 2,7
(ASTM - D 1238)
Densité (g/cm3) :0,974
(ASTM - D 1505)
Résistance à la traction (kg/cm2) : 153 (ASTM-D412)
Allongement à la rupture en % : 1050 (ASTM-D412)
Déformation restante après rupture en % : 47
(ASTM - D 412)
Flexibilité à basses températures CC) : -45
(ASTM 1053) CHARACTERISTIOUES OF THE FILM:
(Melting index) (g / 10 min): 2.7
(ASTM - D 1238)
Density (g / cm3): 0.974
(ASTM - D 1505)
Tensile strength (kg / cm2): 153 (ASTM-D412)
Elongation at break in%: 1050 (ASTM-D412)
Deformation remaining after rupture in%: 47
(ASTM - D 412)
Flexibility at low DC temperatures): -45
(ASTM 1053)

Claims (4)

b) de 50 à 95 % en poids de copolymère séquencé styrène-butadiène, ces copolymères ayant une densité de 0,950 à 1,01 g/cm3. b) from 50 to 95% by weight of styrene-butadiene block copolymer, these copolymers having a density of 0.950 to 1.01 g / cm3. a) de 5 à 50 % en poids de copolymère styrène-butadiène-styrène et a) from 5 to 50% by weight of styrene-butadiene-styrene copolymer and REVENDICATIONS 1. Film étirable alimentaire autoadhésif ayant de bonnes caractéristiques optiques et mécaniques, sans déformation résiduelle, caractérisé en ce qu'il est réalisé par extrusion-soufflage (filière annulaire) ou extrusion de feuille à plat (filière plate) d'un mélange de copolymère styrène-butadiène-styrène et d'un copolymère séquencé styrène-butadiène, en ce que l'adhésivité est obtenue par effet caoutchoutique et en ce qu'il comprend: CLAIMS 1. Self-adhesive stretchable food film having good optical and mechanical characteristics, without residual deformation, characterized in that it is produced by extrusion-blowing (annular die) or extrusion of flat sheet (flat die) of a mixture of styrene-butadiene-styrene copolymer and of a styrene-butadiene block copolymer, in that the adhesiveness is obtained by rubbery effect and in that it comprises: 2. Film selon la revendication 1, caractérisé par le fait que la teneur du composant a) dans le mélange de copolymères varie de 8 à 15 % en poids.2. Film according to claim 1, characterized in that the content of component a) in the mixture of copolymers varies from 8 to 15% by weight. 3. Film selon la revendication 1, caractérisé par le fait que la teneur du composant a) dans le mélange de copolymères varie de 25 à 40 % en poids.3. Film according to claim 1, characterized in that the content of component a) in the mixture of copolymers varies from 25 to 40% by weight. 4. Film selon les revendications 1 à 3, caractérisé par le fait que son épaisseur est de 10 à 40 cru. 4. Film according to claims 1 to 3, characterized in that its thickness is 10 to 40 raw.
FR9206320A 1992-05-22 1992-05-22 Stretch cling film for food packaging - made by extrusion of a mixt. of a styrene]-butadiene]-styrene] copolymer and a sequenced styrene]-butadiene] copolymer Withdrawn FR2691436A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9206320A FR2691436A1 (en) 1992-05-22 1992-05-22 Stretch cling film for food packaging - made by extrusion of a mixt. of a styrene]-butadiene]-styrene] copolymer and a sequenced styrene]-butadiene] copolymer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9206320A FR2691436A1 (en) 1992-05-22 1992-05-22 Stretch cling film for food packaging - made by extrusion of a mixt. of a styrene]-butadiene]-styrene] copolymer and a sequenced styrene]-butadiene] copolymer

Publications (1)

Publication Number Publication Date
FR2691436A1 true FR2691436A1 (en) 1993-11-26

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FR9206320A Withdrawn FR2691436A1 (en) 1992-05-22 1992-05-22 Stretch cling film for food packaging - made by extrusion of a mixt. of a styrene]-butadiene]-styrene] copolymer and a sequenced styrene]-butadiene] copolymer

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771641A3 (en) * 1995-11-01 1997-12-03 Shell Internationale Researchmaatschappij B.V. Process to prepare a blown film of a block copolymer composition
DE102016122818A1 (en) 2016-11-25 2018-05-30 Waldemar Schmidt Co-extruded PVC food packaging film and process for its production

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52115855A (en) * 1976-03-24 1977-09-28 Gunze Kk Biaxially oriented heat shrinkable polystylene film havig lowwtemperature shrinking property and colddresistance
JPS52117947A (en) * 1976-03-31 1977-10-03 Asahi Chem Ind Co Ltd High-impact styrene resin compositions
GB2168362A (en) * 1984-12-17 1986-06-18 Bcl Ltd Compositions for packaging films

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52115855A (en) * 1976-03-24 1977-09-28 Gunze Kk Biaxially oriented heat shrinkable polystylene film havig lowwtemperature shrinking property and colddresistance
JPS52117947A (en) * 1976-03-31 1977-10-03 Asahi Chem Ind Co Ltd High-impact styrene resin compositions
GB2168362A (en) * 1984-12-17 1986-06-18 Bcl Ltd Compositions for packaging films

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 7745, Derwent Publications Ltd., London, GB; AN 77-80267Y & JP-A-52 115 855 (GUNZE) 28 Septembre 1977 *
DATABASE WPI Week 7746, Derwent Publications Ltd., London, GB; AN 77-81818Y & JP-A-52 117 947 (ASAHI CHEMICAL IND. K.K.) 3 Octobre 1977 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771641A3 (en) * 1995-11-01 1997-12-03 Shell Internationale Researchmaatschappij B.V. Process to prepare a blown film of a block copolymer composition
DE102016122818A1 (en) 2016-11-25 2018-05-30 Waldemar Schmidt Co-extruded PVC food packaging film and process for its production
WO2018095847A1 (en) 2016-11-25 2018-05-31 SCHMIDT, Natalya Coextruded pvc-based food packaging film and method for producing same
US11447315B2 (en) 2016-11-25 2022-09-20 Waldemar Vladimir SCHMIDT Co-extruded plasticized PVC-based packaging films and method for its production

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