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a technology of separator and spherical plate, which is applied in the field of separator, can solve the problems of low impact resistance, low tear resistance, and lack of toughness
Inactive Publication Date: 2015-01-01
NITTO DENKO CORP
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[0042]The substrate for the separator according to the present invention does not melt or deform at high temperatures more than 100° C. The substrate keeps its intrinsic rigidity and does not break or tear when tension is applied to the substrate during, for example, production or processing of the separator or winding thereof into a roll.
Problems solved by technology
Polylactic acid, which is a highly elastic and strong polymer, unfortunately, lacks toughness and has low impact resistance, low tear resistance, and low flexibility.
Although the melting point is approximately 170° C., polylactic acid thermally deforms at temperatures of not less than the glass transition temperature, i.e., not less than 60° C., and cannot keep a film shape.
Unfortunately, blending of large amounts of the petroleum-derived polymer and additives significantly reduces the ratio of the plant-derived component (degree of biomass).
Unfortunately, in this method, addition of the plasticizer may cause bleed-out, and an effect of improving tear resistance is little while an effect of improving flexibility is attained.
If such a film or sheet is used as a substrate for a separator, such separator may be broken or torn during the production or processing thereof.
Method used
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[0166]Hereinafter, the present invention will be more specifically described using Examples and Comparative Examples. The present invention will not be limited to these. Evaluations in Examples and the like were made as follows.
[0167]The following materials were used in Examples and the like.
[0168]A1: trade name “Terramac TP-4000” (made by Unitika Limited)
[0169]B1: maleic anhydride group-containing modified polypropylene (weight average molecular weight: 32000, acid value: 52 mgKOH / g, trade name “Umex 1010,” made by Sanyo Chemical Industries, Ltd.)
[0170]C1: acrylic-modified polytetrafluoroethylene (trade name “METABLEN A-3000,” made by MITSUBISHI RAYON CO., LTD.)
[0171]D1: zinc phenyl phosphonate (trade name “ECOPROMOTE,” made by Nissan Chemical Industries, Ltd.)
[0172]E(a): polyglycerol fatty acid ester (number average molecular weight Mn: 1300, trade name “Chirabasol VR-17,” made by Taiyo Kagaku Co., Ltd.)
[0175]Each of resin compositions was prepared in the compounding proportion shown in Table 1 below, and was melt kneaded with a Banbury mixer. By calendering with a calender with four reverse-L shaped rolls, the resin composition was formed into a film to have a thickness of 50 μm (melt film forming step). Next, as shown in FIG. 1, three rolls (take-off roll) heatable to any temperature were disposed immediately after the melt film forming step. The melt film formed resin composition was passed through the three rolls in a staggered manner, and then through cooling rolls to solidify the resin composition. A film was prepared. Subsequently, as shown in Table 1 below, the cooled and solidified and formed film was heated with a heat roll controlled to be any temperature, thereby to promote crystallization (crystallization promoting step).
[0176]The temperature of the resin composition in the melt film forming step (“resin temperature in the melt film forming step”) was the surface tempe...
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Abstract
The present invention provides a separator including a separator substrate composed of a polylactic acid film or sheet having tear strength so as not to break or tear during production or processing of the separator. The separator is a separator including a separator substrate and a removable pressure-sensitive adhesive layer on at least one surface of the separator substrate, wherein the separator substrate is composed of a polylactic acid film or sheet comprising polylactic acid (A) wherein the tear strength of the film or sheet is not less than 100 N / mm when the film or sheet is torn at least in a flow direction (MD), a rate of dimensional change due to heating is not more than ±3% in the flow direction (MD) and a transverse direction (TD), and a rate of dimensional change due to loaded heating is not more than ±3% in the flow direction (MD).
Description
TECHNICAL FIELD[0001]The present invention relates to a separator, and more specifically relates to a separator (release liner) including a substrate composed of a polylactic acid film or sheet that has high heat resistance and high tear resistance, and does not break or tear during production or processing. The separator is used to protect surfaces of pressure-sensitive adhesive layers of pressure-sensitive adhesive tapes, pressure-sensitive adhesive sheets, labels, and the like.BACKGROUND ART[0002]Polylactic acid is a plant-derived biomass polymer, and has been receiving attention as a resin alternative to petroleum-derived polymers. Polylactic acid, which is a highly elastic and strong polymer, unfortunately, lacks toughness and has low impact resistance, low tear resistance, and low flexibility. Polylactic acid has a low rate of crystallization, and barely shows crystal growth in ordinary crystal growth. Although the melting point is approximately 170° C., polylactic acid therma...
Claims
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Application Information
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Patent Type & AuthorityApplications(United States)
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