JP2007131868A5

JP2007131868A5 -

Info

Publication number: JP2007131868A5
Application number: JP2007031708A
Authority: JP
Filing date: 2007-02-13
Publication date: 2007-09-20

Description

上記の本発明の目的は、
（１）粒子０．０１〜１重量％を含有するポリ乳酸を主体とするポリマーからなる延伸フィルムであって、該フィルムの１２０℃の熱風中での少なくとも一方向の熱収縮率が２０％以上であり、フィルムの最大熱収縮応力が５．０ＭＰａ以下であることを特徴とする熱収縮フィルム、
（２）粒子０．０１〜１重量％を含有するポリ乳酸を主体とするポリマーからなる延伸フィルムであって、該フィルムの１２０℃の熱風中での少なくとも一方向の熱収縮率が２０％以上であり、フィルムの最大熱収縮応力が５．０ＭＰａ以下であるフィルムであって、二軸に延伸後さらに長手方向あるいは幅方向に延伸する工程と、熱処理を行う工程を、含む方法により得られうることを特徴とする熱収縮フィルム、
（３）粒子０．０１〜１重量％を含有するポリ乳酸を主体とするポリマーからなる延伸フィルムであり、該フィルムの１２０℃の熱風中での少なくとも一方向の熱収縮率が２０％以上であり、フィルムの最大熱収縮応力が５．０ＭＰａ以下であるフィルムの製造方法であって、二軸に延伸後さらに長手方向あるいは幅方向に延伸する工程と、熱処理を行う工程を有することを特徴とする熱収縮フィルムの製造方法、
によって達成される。
The above object of the present invention is to
(1) A stretched film composed of a polymer mainly composed of polylactic acid containing particles of 0.01 to 1% by weight, wherein the film has a thermal shrinkage rate of 20% or more in at least one direction in 120 ° C. hot air A heat shrinkable film, wherein the film has a maximum heat shrinkage stress of 5.0 MPa or less,
(2) A stretched film composed of a polymer mainly composed of polylactic acid containing 0.01 to 1% by weight of particles, wherein the film has a thermal shrinkage rate of 20% or more in at least one direction in 120 ° C. hot air The film has a maximum heat shrinkage stress of 5.0 MPa or less, and can be obtained by a method including a step of stretching in the longitudinal direction or the width direction after stretching biaxially and a step of performing heat treatment. Heat shrinkable film,
(3) A stretched film comprising a polymer mainly composed of polylactic acid containing 0.01 to 1% by weight of particles, and the film has a thermal shrinkage rate of 20% or more in at least one direction in 120 ° C. hot air. A method for producing a film having a maximum heat shrinkage stress of 5.0 MPa or less, characterized by having a step of stretching in the longitudinal direction or the width direction after stretching biaxially and a step of performing heat treatment Manufacturing method of heat shrink film,
Achieved by:

Claims

A stretched film composed of a polymer mainly composed of polylactic acid containing 0.01 to 1% by weight of particles, wherein the film has a thermal shrinkage rate of 20% or more in at least one direction in 120 ° C. hot air, A heat shrink film having a maximum heat shrink stress of 5.0 MPa or less.

A stretched film composed of a polymer mainly composed of polylactic acid containing 0.01 to 1% by weight of particles, wherein the film has a thermal shrinkage rate of 20% or more in at least one direction in 120 ° C. hot air, The film has a maximum heat shrinkage stress of 5.0 MPa or less, and can be obtained by a method including a step of stretching in the longitudinal direction or the width direction after stretching biaxially and a step of performing heat treatment. Heat shrink film.

It is a film of Claim 2, Comprising: It can obtain by the method of performing heat processing after extending | stretching biaxially, and also extending | stretching to a longitudinal direction or the width direction, The heat-shrink film characterized by the above-mentioned.

The heat-shrinkable film according to claim 2 or 3, wherein a heat treatment temperature is not less than a stretching temperature and not more than a melting point of a polymer mainly composed of polylactic acid.

The heat shrinkable film according to any one of claims 2 to 4, wherein the film has a heat shrinkage rate of 40% or more in at least one direction in hot air at 120 ° C.

The heat-shrinkable film according to any one of claims 2 to 5, wherein the heat-shrinkable film is a stretched film made of a polymer mainly composed of polylactic acid containing 0.01 to 0.5% by weight of particles.

The heat-shrinkable film according to any one of claims 2 to 6 , which is dissolved in an aqueous solution exceeding pH 7 by 50% or more.

The heat-shrinkable film according to any one of claims 2 to 7 , wherein the heat-shrinkable film is dissolved in 80% or more with a 2% aqueous sodium hydroxide solution.

Ri stretched film Der comprising a polymer mainly composed of polylactic acid containing particles from 0.01 to 1% by weight, at least in one direction of the heat shrinkage in a hot air of 120 ° C. The film is 20% or more, A method for producing a film having a maximum heat shrinkage stress of 5.0 MPa or less, wherein the film has a step of stretching in the longitudinal direction or the width direction after stretching biaxially and a step of performing heat treatment A method for producing a shrink film.

A method of manufacturing a film according to claim 9, after biaxially, heat treatment is performed, after further stretching in the longitudinal direction or the width direction, the manufacturing method of the heat-shrinkable film characterized by performing the heat treatment.

The method for producing a heat-shrinkable film according to claim 9 or 10, wherein a heat treatment temperature is not less than a stretching temperature and not more than a melting point of a polymer mainly composed of polylactic acid.

The method for producing a heat-shrinkable film according to any one of claims 9 to 11, wherein the film has a heat shrinkage rate of 40% or more in at least one direction in hot air at 120 ° C.

The method for producing a heat-shrinkable film according to any one of claims 9 to 12, which is a stretched film made of a polymer mainly composed of polylactic acid containing 0.01 to 0.5% by weight of particles.

The method for producing a heat-shrinkable film according to any one of claims 9 to 13 , wherein the heat-shrinkable film is dissolved in an aqueous solution exceeding pH 7 by 50% or more.

The method for producing a heat-shrinkable film according to any one of claims 9 to 14 , wherein the heat-shrinkable film is dissolved by 80% or more in a 2% aqueous sodium hydroxide solution.

The heat-shrink film manufactured by the method in any one of Claims 9-15.