Heat-shrinkable foam films

a foam film, heat shrinkable technology, applied in the field of foam films, can solve the problems of printing being likely to be out of alignment, printing cannot be satisfactorily carried out, etc., and achieve the effects of good finishing properties, excellent anti-natural shrinkage, and good impact strength

Inactive Publication Date: 2007-02-01
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0036] The foamed film employing a block copolymer or a block copolymer composition of the present invention, is excellent in anti-natural shrinkage, impact strength, rigidity, heat shrinkability, printing properties and heat insulating properties and has a good finishing property upon heat shrinkage, and it is suitably used as a heat shrinkable label, a heat shrinkable cap seal or a packaging film, and it is particularly suitable as a label for a container containing a hot product.

Problems solved by technology

Its heat insulating property is good, but it has problems such that due to surface irregularities, printing can not satisfactorily be carried out, and its natural shrinkage is so large that it can not be applied as a label to various bottles, or printing is likely to be out of alignment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

EXAMPLE 1-1 TO 1-6 AND COMPARATIVE EXAMPLES 1-1 TO 1-5

[0113] (A) Components used for Heat Shrinkable Multilayer Film

[0114] Component (a): Vinyl aromatic hydrocarbon / conjugated diene block copolymers as shown in Table 1 were used.

TABLE 1-1BlockProportions of monomerproportionPolymerunits (mass %)(mass %)a1Butadiene1872Styrene82a2Butadiene2676Styrene74a3Butadiene5480Styrene46a4Butadiene490Styrene96

[0115] Component (b): Vinyl aromatic hydrocarbon polymers as shown in Table 1-2 were used.

TABLE 1-2Proportions of monomerPolymerPolymer structureunits (mass %)b1PolystyreneStyrene100b2Styrene / methacrylic acidMethacrylic acid10copolymerStyrene90b3Styrene / n-butyl acrylaten-Butyl acrylate20copolymerStyrene80b4Styrene / methylMethyl methacrylate22methacrylate copolymerStyrene78b5Styrene / n-butyln-Butyl acrylate14acrylate / methylMethyl methacrylate7methacrylate copolymerStyrene79b6High impact polystyreneButadiene6Styrene94

[0116] Component (C): Vinyl aromatic hydrocarbon polymers at shown in Tab...

example 2

REFERENCE EXAMPLES 1 TO 6

[0153] In these Reference Examples, a cyclohexane solvent was used, and using n-butyl lithium as an initiator and tetrahydrofuran as a randomization agent, styrene and butadiene were copolymerized to produce block copolymers having characteristics as shown in Table 2-1.

reference example 1

[0154] (1) In a reactor, 490 kg of cyclohexane as a polymerization solvent and 2.1 kg of styrene monomer were charged and maintained at 30° C.

[0155] (2) 1,830 ml of a cyclohexane solution containing 10 mass % of n-butyl lithium was added as a polymerization catalyst solution thereto, whereby the styrene monomer was subjected to anion polymerization. Further, in all of the polymerization catalyst solutions in the subsequent Examples and Comparative Examples, a cyclohexane solution containing 10 mass % of n-butyl lithium was employed.

[0156] (3) After the styrene monomer was completely consumed, while the internal temperature of the reaction system is maintained at 80° C., styrene monomer in a total amount of 111.5 kg and butadiene in a total amount of 14.1 kg, were simultaneously added at constant rates of 74.3 kg / hr and 9.4 kg / hr, respectively, and after completion of the addition, the system was maintained as it was, for five minutes.

[0157] (4) After butadiene gas was completely ...

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Abstract

To provide a foamed film or multilayer foamed film excellent in heat insulating properties, a heat shrinkable foamed film or heat shrinkable multilayer foamed film made thereof, a heat shrinkable label, and a container covered therewith. A styrene foamed film characterized by having at least one foamed layer which contains a resin composition comprising from 20 to 100 parts by mass of the following (a) and from 0 to 80 parts by mass of the following (b) and which has a thickness of from 30 to 200 μm and a specific gravity of from 0.3 to 0.9: (a) a block copolymer wherein the ratio of a vinyl aromatic hydrocarbon to a conjugated diene is from 50 / 50 to 90 / 10, (b) at least one vinyl aromatic hydrocarbon polymer selected from the following (i) to (v): (i) a block copolymer of a vinyl aromatic hydrocarbon with a conjugated diene, (ii) a vinyl aromatic hydrocarbon polymer, (iii) a copolymer of a vinyl aromatic hydrocarbon with (meth)acrylic acid, (iv) a copolymer of a vinyl aromatic hydrocarbon with a (meth)acrylate, and (v) a rubber-modified styrene polymer.

Description

TECHNICAL FIELD [0001] The present invention relates to a foamed film which presents a heat shrinkable film excellent in heat shrinkage, anti-natural shrinkage and heat insulating properties, a heat shrinkable foamed multilayer film, a label employing it and a container covered therewith. BACKGROUND ART [0002] Heretofore, for the sale of canned coffees, etc., metal can containers made of aluminum or steel have been widely used. To sell such beverages hot, for example, a canned product discharged from a product storage section of a vending machine, is led to an induction heating device provided inside of the product outlet, and the canned product is rapidly heated to a temperature for sale hot before taken out from the product outlet, so that it is sold as a hot product. Such a temperature for sale hot is usually considered to be proper at a level of 60° C., but since such a hot metal can will be grabbed by a hand, it may be too hot, and it is desired to overcome such a problem. [000...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D39/00B32B27/00C08J9/00C08J9/04
CPCC08J9/0061C08J2325/04Y10T428/1376C08J2425/00C08J2453/00C08J2353/02C08J9/08C08J5/18C08L25/04C08L53/02C08L2203/16
Inventor TOYA, HIDEKISATO, EIJISHIMA, YUJI
Owner DENKA CO LTD
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