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Non-transparent microvoided axially stretched film, production process therefor and process for obtaining a transparent pattern therewith

a technology of axially stretched films and non-transparent microvoids, which is applied in the direction of paper/cardboard containers, duplicating/marking methods, lamination, etc., can solve the problems of loss of opacity during thermal fixation, and achieve the effect of promoting opacity and loss of opacity

Inactive Publication Date: 2008-10-16
AGFA GEVAERT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]It has been surprisingly found that addition of small quantities of an opacifying inorganic pigment enables the thermal fixation (setting) process necessary to realize acceptable dimensional stability to be carried out at lower temperatures, which surprisingly results in a loss in opacity during thermal fixation, which is substantially lower than that occurring at the higher thermal fixation temperatures, which would otherwise be necessary. It has also been surprisingly found that opacity is promoted by using lower temperatures than conventionally used during stretching and in particular by using lower temperatures than conventionally used with polyethylene terephthalate-SAN-polymer blends during transversal stretching and by adjusting the polyester matrix composition to make this realizable.

Problems solved by technology

It has been surprisingly found that addition of small quantities of an opacifying inorganic pigment enables the thermal fixation (setting) process necessary to realize acceptable dimensional stability to be carried out at lower temperatures, which surprisingly results in a loss in opacity during thermal fixation, which is substantially lower than that occurring at the higher thermal fixation temperatures, which would otherwise be necessary.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 58

[0154]Extrudates 1 to 4 were produced by mixing the respective parts of PET 01, PET 03, of the particular SAN used, BaSO4 and UVITEX OB-one given in Table 1, drying the resulting mixture at 150° C. for 4 hours under vacuum (<100 mbar), melting them in a PET-extruder and finally extruding them through a sheet die and cooling the resulting extrudates.

TABLE 1UVITEXPET / SANExtrudatePET01PET03SAN 06BaSO4OB-onewt.nr[wt %][wt %][wt %][wt %][ppm]ratio142.542.5150—5.67239.539.51921504.16339.539.5210—3.7643838240—3.17

[0155]Extrudates 1 to 4 were axially stretched longitudinally with an INSTRON apparatus in which the extrudates are heated in an oven mounted on the apparatus under the conditions given in Table 2 to yield the axially stretched films of EXAMPLES 1 to 23, EXAMPLES 24 to 35, EXAMPLES 36 to 46 and EXAMPLES 47 to 58 respectively.

TABLE 2EX-ExtrudateAM-usedStretchStretchStretchPLEin filmStretchtemperaturetensionspeedOpticalnrproductionratio[° C.][N / mm2][% / min]density111.8852.915000.3321...

examples 59 to 78

[0157]The PET-types and SAN-types used for producing the extrudate used in producing of the films of EXAMPLES 59 to 78 are given in Table 3. The PET, SAN, BaSO4 and UVITEX OB-one in the weight percentages given in Table 3 were mixed and then dried at 150° C. for 4 hours under vacuum (<100 mbar), the mixtures then melted in a PET-extruder and extruded through a sheet die and cooled to produce the extrudates 1, 2 and 5 to 22.

TABLE 3PET / SANExtrudatePET01PET03SANSANBaSO4OB-onewtnr[wt %][wt %]type[wt %][wt %][ppm]ratio585—03150—5.67685—06150—5.67142.542.506150—5.67782—06180—4.5684141  06180—4.56979—06210—3.761039.539.5062101503.761139.539.5062101503.761276—06240—3.171339.539.5062011503.951440.540.5061721504.761539.539.5061921504.16239.539.5061921504.161639.539.5061921504.161739.539.506192—4.161839.539.5061921504.161939.539.5061921504.162039.539.5061921504.162139.539.5061921504.162239.539.5061831504.39

Extrudates 1, 2 and 5 to 22 were then stretched as given in Tables 4 and 5 for the non-b...

invention example 79

[0163]The film of INVENTION EXAMPLE 72 was mounted in an Instron 4411 apparatus and was heated at temperatures between 138 and 200° C. for 5 seconds with a soldering iron in the upper clamp making contact with the film at a pressure of 0.5 N / mm2. The optical densities of the film after the test were measured in transmission with a MacBeth TR924 densitometer with a visible filter. The results are summarized in Table 8 below.

TABLE 8Temperature [° C.]Optical density, ODΔOD% reduction in ODbefore heating1.121381.000.1210.71500.910.3127.71750.610.5145.52000.420.7062.5

In other experiments the thermofixated stretched film was heated at a temperature of 175° C. for 5 seconds at different pressures between 0.1 N / mm2 to 1.50 N / mm2 in the Instron apparatus with the results shown in Table 9 below.

TABLE 9Pressure [N / mm2]Optical densityΔOD% reduction in ODbefore heating1.120.011.060.065.40.100.920.2017.90.500.610.5145.51.000.510.6154.51.500.400.7264.3

In further experiments the thermofixated stret...

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Abstract

A film consisting essentially of a continuous phase linear polyester matrix having dispersed therein a non-crosslinked random SAN-polymer and dispersed or dissolved therein at least one ingredient from the group of ingredients consisting of inorganic opacifying pigments, whitening agents, colorants, UV-absorbers, light stabilizers, antioxidants and flame retardants, wherein the film is white, microvoided, non-transparent and axially stretched; the linear polyester matrix has monomer units consisting essentially of at least one aromatic dicarboxylic acid, at least one aliphatic diol and optionally at least one aliphatic dicarboxylic acid; and the weight ratio of the linear polyester to the non-crosslinked SAN-polymer is in the range of 2.0:1 to 19.0:1, wherein one of said at least one aromatic dicarboxylate monomer units is isophthalate and said isophthalate is present in said polyester matrix in a concentration of 15 mole % or less of all the dicarboxylate monomer units in said linear polyester matrix; the use of the non-transparent microvoided axially stretched film as a synthetic paper; an image recording element comprising the non-transparent microvoided axially stretched film; a process for the preparing of the non-transparent microvoided axially stretched film; and a process for obtaining a transparent pattern therewith.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 850,512 filed Oct. 10, 2006, U.S. Provisional Application No. 60 / 850,511 filed Oct. 10, 2006, U.S. Provisional Application No. 60 / 908,526 filed Mar. 28, 2007, U.S. Provisional Application No. 60 / 908,536 filed Mar. 28, 2007, U.S. Provisional Application No. 60 / 908,542 filed Mar. 28, 2007, U.S. Provisional Application No. 60 / 908,545 filed Mar. 28, 2007, all incorporated by reference. In addition, this application claims the benefit of European Application No. 06121669.3 filed Oct. 3, 2006, European Application No. 06121665.1 filed Oct. 3, 2006, European Application No. 07104953.0 filed Mar. 27, 2007, European Application No. 07104947.2 filed Mar. 27, 2007, European Application No. 07104948.0 filed Mar. 27, 2007, and European Application No. 07104950.6 filed Mar. 27, 2007, which are all also incorporated by reference.FIELD OF THE INVENTION[0002]The present inve...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08J9/00B29C65/00
CPCB29C55/06Y10T428/254B29K2033/18B29K2067/00B29K2105/0032B29K2105/0088B29K2105/04B29K2711/12B29K2995/0025B41M5/36B41M5/41B41M5/508B41M2205/02B41M2205/12C08J5/18C08J2367/02C08K3/0033C08L25/12C08L67/02G03C1/7954B29C55/143Y10T428/24893Y10T428/24802Y10T156/10Y10S430/165C08L2666/06C08L35/00C08L25/00C08K3/013Y10T428/249953Y10T428/31855Y10T428/249992Y10T428/249978Y10T428/31786
Inventor QUINTENS, DIRKLEENDERS, LUC
Owner AGFA GEVAERT AG
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