Block copolymer composition, production method therefor, and film

a copolymer and film technology, applied in the field of block copolymer composition, can solve the problems of film breakage, impaired mechanical properties, etc., and achieve the effects of preventing the formation of holes, high modulus of elasticity, and low tension

Active Publication Date: 2017-12-28
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]The aspects of the invention thus provide a block copolymer composition that has a high modulus of elasticity, exhibits low tension set, and ensures that the formation of a hole is prevented when a film is formed by melt-forming the block copolymer composition, a method for producing the block copolymer composition, and a film obtained by melt-forming the block copolymer composition.

Problems solved by technology

When a hole is formed in an elastic film used for a sanitary article, the mechanical properties of the film are impaired, and breakage of the film may occur, for example.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

(1) Production of Block Copolymer Composition

[0159]A pressure-resistant reactor was charged with 23.3 kg of cyclohexane, 1.6 mmol of N,N,N′,N′-tetramethylethylenediamine (hereinafter referred to as “TMEDA”), and 0.91 kg of styrene. 104.4 mmol of n-butyllithium (1.6 M solution) was added to the mixture while stirring the mixture at 40° C. After the addition, the mixture was heated to 50° C. to effect a polymerization reaction for 1 hour. The polymerization conversion ratio of styrene was 100 wt %.

[0160]5.20 kg of isoprene was continuously added to the reactor over 1 hour while maintaining the temperature of the mixture at 50 to 60° C. After the addition, a polymerization reaction was effected for a further 1 hour. The polymerization conversion ratio of isoprene was 100%.

[0161]0.91 kg of styrene was continuously added to the reactor over 1 hour while maintaining the temperature of the mixture at 50 to 60° C. After the addition, a polymerization reaction was effected for a further 1 ho...

examples 2 and 3

[0179]A block copolymer composition was produced in the same manner as in Example 1, except that the amounts of styrene, n-butyllithium, TMEDA, isoprene, and methanol were changed as shown in Table 1, and pellets and a film were prepared using the block copolymer composition.

[0180]The properties of the block copolymer composition, the pellets, and the film were measured in the same manner as in Example 1. The results are shown in Table 2.

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PUM

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Abstract

The present invention provides a block copolymer composition comprising a block copolymer A represented by formula (A) and a block copolymer B represented by formula (B), the block copolymer composition having a water content of 200 ppm by weight or less when the block copolymer composition has been formed in a shape of pellets, dried, and allowed to stand at a temperature of 37° C. and a relative humidity of 70% for 24 hours. In the formulas, Ar1a, Ar1b, and Ar2b are aromatic vinyl polymer blocks having a weight average molecular weight of 6,000-18,000, Ar2a is an aromatic vinyl polymer block having a weight average molecular weight of 40,000-400,000, and Da and Db are specific conjugated diene polymer blocks. The block copolymer composition has a high modulus of elasticity, exhibits low tension set, and ensures that the formation of a hole is prevented when a film is formed by melt-forming the block copolymer composition.Ar1a-Da-Ar2a   (A)Ar1b-Db-Ar2b   (B)

Description

TECHNICAL FIELD[0001]The present invention relates to a block copolymer composition that has a high modulus of elasticity, exhibits low tension set, and ensures that the formation of a hole is prevented when a film is formed by melt-forming the block copolymer composition, a method for producing the block copolymer composition, and a film obtained by melt-forming the block copolymer composition.BACKGROUND ART[0002]An aromatic vinyl-conjugated diene-aromatic vinyl block copolymer (i.e., thermoplastic elastomer) exhibits excellent elasticity and flexibility, and is used as a material for producing an elastic film that is used when producing a sanitary article (e.g., disposable diaper and sanitary item), for example.[0003]A sanitary article (e.g., disposable diaper and sanitary item) is required to follow the motion of the wearer, and fit the wearer, and an elastic film is used to form various parts of the sanitary article. For example, an elastic film is provided around the thigh open...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L53/02C08J5/18
CPCC08L53/02C08J5/18C08J2353/02C08L2205/025C08L2203/16A61F13/49009
Inventor ODA, RYOJIISHII, YUTA
Owner ZEON CORP
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