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Stretched resin film

Inactive Publication Date: 2008-05-08
YUPO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0283] The stretched resin film of the present invention is resistant to waving due to contact with the vehicle of offset printing ink during offset printing. This ensures that the stretched resin films of the present invention have excellent printing properties. The stretched resin film of the present invention is particularly suitable for use as a material for maps, book covers, wrapping paper, book paper, sticker sheets, poster paper, menu sheets, hanging screens, labels, shopping bags, cardboard, brochures, illuminated sign boards, and so forth.

Problems solved by technology

However, synthetic paper comprising a stretched polyolefinic film or such film compounded with an inorganic fine powder is printed with such quick-drying offset printing inks, vehicle of the quick-drying offset printing ink swells the polyolefin of the synthetic paper, thereby producing local surface waving or curling of the printed film.
This is a significant practical obstacle in using such synthetic papers.
However, this approach sacrifices the quick-drying property.
In addition, such special offset printing inks for polyolefinic films require long drying times, and are used mainly in small specialty printing shops and manufacturers.
However, replacement of the conventional ink for pulp-based paper is time- and labor-consuming.
However, this approach is still not completely successful in solving the problem of the swelling of the film (referred to as “solvent attack” hereinafter) due to the vehicle (in particular high-boiling-point, petroleum-based solvents such as mineral oil) in the offset printing ink.
However, this approach is not successful in solving the solvent attack in a practical level.

Method used

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Examples

Experimental program
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Effect test

example 1

[0229] The amorphous resin, the polyolefinic resin and the inorganic fine powder, that are indicated in Table 3, were admixed in amounts shown in Table 3 to prepare composition (A). Composition (A) was melted and kneaded in an extruder set to 270° C., extruded through a die to obtain a sheet, and cooled by a cooling device to obtain an unstretched sheet. This sheet was heated to 155° C. and longitudinally stretched five-fold by exploiting the difference in peripheral speed of a group of rolls. The five-fold stretched sheet was then heated to 155° C., transversely stretched 7.5-fold with a tenter, and annealed at 163° C., yielding a single-layer film. The surface of the single-layer film was treated by corona discharge, yielding a stretched film of single-layer structure consisting solely of layer (A) (having a film thickness of 150 micrometers).

example 2

[0230] The amorphous resin, the polyolefinic resin and the inorganic fine powder, that are indicated in Table 3, were admixed in amounts shown in Table 3 to prepare composition (A). Separately, 40 wt % of heavy calcium carbonate (E) was added to a mixture containing 50 wt % of propylene homopolymer (1) and 10 wt % of high-density polyethylene (γ) to obtain composition (B). Heavy calcium carbonate (E), propylene homopolymer (β 1) and high-density polyethylene (γ) are indicated in Table 2.

[0231] Compositions (A) and (B) were melted and kneaded in separate extruders set to 270° C., laminated in a die to achieve the configuration (B) / (A) / (B), coextruded through a single die, and cooled by a cooling device to obtain an unstretched sheet. This sheet was heated to 155° C. and longitudinally stretched five-fold by exploiting the difference in peripheral speed of a group of rolls. The three-layer laminate was heated to 155° C., transversely stretched 7.5-fold with a tenter, and annealed at ...

example 3

[0232] The amorphous resin, the polyolefinic resin and the inorganic fine powder, that are indicated in Table 3, were admixed in amounts shown in Table 3 to prepare composition (A). Composition (A) was melted and kneaded in an extruder set to 270° C., extruded through a die to obtain a sheet, and cooled by a cooling device to obtain an unstretched sheet. This sheet was heated to 150° C., longitudinally stretched five-fold by exploiting the difference in peripheral speed of a group of rolls, and annealed at 155° C. to obtain a single-layer film. The surface of the single-layer film was treated by corona discharge, yielding a stretched resin film of single-layer structure consisting solely of layer (A) (having a film thickness of 150 micrometers).

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Abstract

Disclosed is a stretched resin film comprising a layer (A) stretched in at least one axial direction and comprising 0 to 98 wt % of a polyolefinic resin, 2 wt % or more and less than 100 wt % of an amorphous resin and more than 0 wt % and 70 wt % or less of an inorganic fine powder and / or an organic filler. The stretched resin film of the present invention is resistant to becoming waved when offset-printed with widely-used, quick-drying offset printing inks, and thus has excellent printing properties.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of and claims the benefit of priority under 35 U.S.C. §120 from U.S. Ser. No. 10 / 400,866, filed Mar. 28, 2003 which is a Continuation-in-part application of International PCT Application No. PCT / JP01 / 08438, filed Sep. 27, 2001, and claims the benefit of priority under 35 U.S.C. § 119 from Japanese Patent Applications No. 2000-298434, filed Sep. 29, 2000 and No. 2000-298435, filed Sep. 29, 2000, the entire contents of each of which are incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to a stretched resin film which is resistant to becoming waved or curled due to contact with the vehicle of offset printing inks during offset printing, and thus has excellent printing properties. The stretched resin film of the present invention may be used as a material for maps, book covers, wrapping paper, book paper, sticker sheets, poster paper, menu sheets, hanging screens,...

Claims

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Application Information

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IPC IPC(8): C08F210/00B32B27/20B32B27/32
CPCB32B27/20Y10S428/91Y10T428/254B32B27/32Y10T428/31913Y10T428/249993Y10T428/31909Y10T428/249992Y10T428/249988Y10T428/31931Y10T428/249991Y10T428/31855Y10T428/31917Y10T428/31938
Inventor ISHIGE, ATSUSHIKITAMURA, KAZUHISA
Owner YUPO CORP
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