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Opaque, white film with low transparency made from a crystallizable thermoplastic

a thermoplastic and crystallization technology, applied in the field of opaque, white biaxial orientation, can solve the problems of limiting the range of application of packaging, poor mechanical properties, and high cost of packaging

Inactive Publication Date: 2006-03-02
MURSCHALL URSULA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of PVDC-coated films—as with metallizing—the coating takes place in a second operation, which makes the packaging markedly more expensive.
However, films modified with EVOH are particularly sensitive to moisture, and this limits their range of application.
In addition, due to their poor mechanical properties they have relatively high thickness or have to be laminated with other materials at high cost.
The disposal of EVOH-modified films after they have been used is also more complicated than that of other films.
In addition to this, some raw materials are not approved by the authorities or are unsuitable for producing packaging for food or drink.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074] An opaque white film of 50 μm thickness was produced and comprised polyethylene terephthalate (RT32, KoSa, Germany) as principal constituent, 18% by weight of barium sulfate (BLANC FIX® XR-HX, Sachtleben Chemie), 200 ppm of optical brightener (TINOPAL®, Ciba-Geigy, Basle) and 40 ppm of blue dye (SUDAN BLUE® 2, BASF, Ludwigshafen). The additives barium sulfate, optical brightener and blue dye were added as masterbatches.

[0075] The polyethylene terephthalate used to prepare the masterbatches had a standard viscosity SV (DCA) of from 900 to 1100.

[0076] The masterbatch (1) was composed of clear polymer, 50% by weight of barium sulfate and 600 ppm of optical brightener. The masterbatch (2) comprised 2000 ppm of blue dye, besides clear polymer.

[0077] Prior to extrusion, 36% by weight of the masterbatch (1), 2% by weight of the masterbatch (2) and 62% by weight of clear polymer were dried at a temperature of 150° C. and then melted in the extruder. The melt was extruded through a...

example 2

[0079] Example 1 was repeated, except that the film had no blue dye.

example 3

[0080] The mixing specification of the film of Example 3 and its coating corresponded to those of the film of Example 2, but the longitudinal stretching ratio was increased to 3.3, while the longitudinal stretching temperatures remained unchanged.

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PUM

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Abstract

The invention relates to an opaque, white film with a thickness of from 10 to 500 μm whose principal constituent is a crystallizable thermoplastic. The film comprises barium sulfate and an optional optical brightener. Optionally, at least one surface of the film bears a functional coating with a thickness of from 5 to 100 nm, in order to confer on the film surface an additional function such as sealability, printability, metallizability, sterilizability, antistatic properties, aroma barrier properties or improved adhesion to materials which would not adhere to the film surface without the coating, for example photographic emulsions.

Description

[0001] This application is a continuation of parent co-pending U.S. application Ser. No. 09 / 779,156, filed Feb. 8, 2001. This application further claims priority through its parent U.S. application to German Application No. 100 07 719.6, filed Feb. 19, 2000. Both U.S. application Ser. No. 09 / 779,156 and German Application No. 100 07 719.6 are hereby incorporated by reference herein in their entirety.[0002] The invention relates to an opaque, white biaxially oriented film with low transparency made from a crystallizable thermoplastic and having a thickness of from 10 to 500 μm, where at least one surface of the film has optionally been provided with an additional functionality. The film comprises at least barium sulfate and an optional optical brightener, and has good orientability, low transparency, and also very good optical and mechanical properties. The invention further relates to a process for producing this film and to the use of the film. BACKGROUND OF THE INVENTION [0003] In...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B27/32C08J7/04B29C55/02B32B27/18B32B27/20B32B27/36C08J3/22C08J5/18C08K3/30C08K5/00C08L67/02
CPCB32B27/36C08J5/18C08J2367/02C08K3/30Y10T428/24802C08K2003/3045C08K5/0041Y10T428/2495C08L67/02Y10T428/31786Y10T428/31855
Inventor MURSCHALL, URSULAKERN, ULRICHOBERLAENDER, KLAUS
Owner MURSCHALL URSULA
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