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Poly(vinyl alcohol) based film

A technology of polyvinyl alcohol and film, which is applied in medical science, bandages, absorbent pads, etc., and can solve problems such as unsatisfactory requirements and durability problems

Inactive Publication Date: 2009-02-18
THE NIPPON SYNTHETIC CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these water-soluble films have improved cold water solubility, they are still not satisfactory for applications that require faster dissolving properties. In addition, wrinkles and elongation still occur when placed under high humidity. Changes in the appearance of the film, that is, its durability is still problematic, so further improvements are required

Method used

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  • Poly(vinyl alcohol) based film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 60 parts of PVA (a1) whose degree of saponification is 72mol%, 4% aqueous solution viscosity at 20°C is 6mPa·s, saponification degree is 98.5mol%, PVA with 4% aqueous solution viscosity at 20°C is 5mPa·s (a2) 40 parts, silicon dioxide (average particle diameter 6.4 μm) (B) 2 parts, trimethylol propane (C) 20 parts and water 690 parts are mixed, and obtaining the resin composition that solid content is 15%[ I] aqueous dispersion.

[0049] The aqueous dispersion of the obtained resin composition [I] was cast on a polyethylene terephthalate (PET) film with a feeder, and then dried at 90° C. for 10 minutes to obtain a 60 μm thick film. PVA type film.

[0050] The obtained PVA film can be completely dissolved in water at 20°C within 10 minutes, and the storage elastic modulus (α) at ​​20°C in a dry atmosphere is 4.0×10 7 Pa, the storage elastic modulus (β) at 20°C and 80% RH is 6.0×10 6 Pa, its ratio (α / β) is 6.7. In addition, the glass transition temperature of the obta...

Embodiment 2

[0062] Except using in embodiment 1 as PVA resin (a1) use saponification degree be 72mol%, the 4% aqueous solution viscosity at 20 ℃ is the PVA70 parts of 6mPa·s, the saponification degree used as PVA resin (a2) is Except for 30 parts of 98.5 mol % PVA having a 4% aqueous solution viscosity of 5 mPa·s at 20° C., the same procedure as in Example 1 was carried out to obtain a PVA-based film.

[0063] The obtained PVA film can be dissolved in water at 20°C within 10 minutes, and the storage modulus (α) at ​​20°C in a dry atmosphere is 3.3×10 7 Pa, the storage elastic modulus (β) under the condition of 20℃×80%RH is 4.3×10 6 Pa, its ratio (α / β) is 7.7. In addition, the glass transition temperature of the obtained PVA-based film was 8°C.

[0064] The same evaluation as in Example 1 was performed on the obtained PVA-based film. The results are shown in Table 1

Embodiment 3

[0066] In addition to using as the PVA resin (a1) in Example 1, the degree of saponification is 72mol%, and the viscosity of 4% aqueous solution at 20°C is 70 parts of PVA of 6mPa·s, and the PVA resin (a2) used is A PVA-based film was obtained in the same manner as in Example 1, except for 30 parts of PVA having a degree of saponification of 88 mol % and a viscosity of 5 mPa·s in a 4% aqueous solution at 20°C.

[0067] The obtained PVA film can be dissolved in water at 20°C within 10 minutes, and the storage elastic modulus (α) at ​​20°C in a dry atmosphere is 3.7×10 7 Pa, the storage elastic modulus (β) under the condition of 20℃×80%RH is 7.2×10 6 Pa, its ratio (α / β) is 5.1. In addition, the glass transition temperature of the obtained PVA-based film was 8°C.

[0068] The same evaluation as in Example 1 was performed on the obtained PVA-based film. The results are shown in Table 1.

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Abstract

A polyvinyl alcohol film which dissolves in water at 20 DEG C. within 10 minutes and has an alpha / beta ratio of not more than 10 wherein alpha is a storage modulus of the film at 20 DEG C. in a dry atmosphere and beta is a storage modulus of the film at 20 DEG C. and 80% RH, and which has an excellent cold water solubility and an excellent durability such that the change in appearance of the film under high humidity is slight and the lowering of the cold water solubility is slight even if the film is stored for a long term.

Description

technical field [0001] The present invention relates to polyvinyl alcohol (hereinafter sometimes abbreviated as PVA) film with excellent cold water solubility, and more specifically, relates to a kind of film whose appearance changes little under high humidity, and even if it is stored for a long time, its stability in cold water is Water-soluble PVA-based film with excellent durability with little loss of solubility. Background technique [0002] Traditionally, PVA-based films have been used as packaging (unit packaging) materials for pharmaceuticals such as pesticides and lotions, (hydraulic) transfer films, sanitary products such as sanitary napkins and paper diapers, etc., due to their water solubility. Used for waste disposal products such as artificial anus receiving bags, medical products such as blood-absorbing paper, and temporary substrates such as seedling film, seed tape, and base fabric for embroidery. Among them, as a unit package of chemicals such as pesticid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L29/04
CPCC08J2329/04C08J5/18A61L15/44C08L29/04
Inventor 北村秀一水谷知由
Owner THE NIPPON SYNTHETIC CHEM IND CO LTD
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