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Water-solubility membrane

A water-soluble film and modification technology, which is applied in packaging and other directions, can solve the problems of product value damage and other problems, and achieve the effect of excellent water solubility

Active Publication Date: 2008-06-18
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in these known water-soluble films, there is a problem that the film gradually turns pale yellow due to the heat history received during film formation and contact with filling chemicals, so that the commercial value of the product is significantly impaired, etc.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0129] It is 22.0mPa·s (20 ℃) ​​to be 22.0mPa·s (20 ℃) ​​by being 22.0mPa·s (20 ℃) ​​to 4%, and the average degree of saponification is 97.2 mol%, and the modification amount using monomethyl maleate is 100 weight of carboxyl-modified PVA (A) of 4.0 mol%. Parts, add 25 parts of glycerin and 12 parts of trimethylolpropane as plasticizer (B), 1.0 parts of sodium sulfite (C), 2 parts of polyoxyalkylene alkyl ether phosphoric acid as surfactant (D) ester monoethanolamine salt, and water to obtain an aqueous dispersion of a resin composition with a solid concentration of 30%.

[0130] The obtained aqueous dispersion of the resin composition (80°C, defoamed) was cast onto a hot plate heated to 80 to 90°C and then dried at a temperature of 80 to 90°C for 1 hour to obtain a PVA film with a thickness of 76 μm (sodium sulfite / total plasticizer=0.03).

[0131] The coloration of the resulting PVA film was measured as described above and had an initial b-value of 0.13. Moreover, the solu...

Embodiment 2 to 8

[0137] A PVA film was obtained in the same manner as in Example 1 except that the types and amounts of the plasticizer and sodium sulfite were as described in Table 1. The obtained film was evaluated in the same manner as in Example 1.

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Abstract

This invention provides a water-soluble film, which is a polyvinyl alcohol film containing a polyvinyl alcohol resin (A), has a time of dissolution in water of 20 C of not more than 60 sec in terms of a film thickness of 76 [mu]m and has a film b value of not more than 0.5 and, after standing at 80 C for 72 hr, a film b value of not more than 1.0, preferably a water-soluble film comprising a polyvinyl alcohol resin (A), at least two plasticizers (B), and a bisulfite (C), the content of the plasticizer (B) based on 100 parts by weight of the polyvinyl alcohol resin (A) being 5 to 50 parts by weight based on 100 parts by weight of the polyvinyl alcohol resin (A), the content ratio of the bisulfite (C) to the plasticizer (B) (C / B: weight ratio) being more than 0.02 and not more than 0.35. The water-soluble film composed mainly of PVA resin is less likely to cause coloration at the time of film formation and coloration with the elapse of time even upon contact with a chemical.

Description

technical field [0001] The present invention relates to a water-soluble film comprising polyvinyl alcohol (hereinafter sometimes referred to as "PVA") as a main component. More specifically, the present invention relates to a water-soluble film excellent in water solubility, which causes little coloration when the film is formed and little coloration over time even when it is in contact with chemicals. Background technique [0002] So far, PVA films have been used for packaging (unit packaging) of chemicals such as pesticides and detergents, films for (hydraulic pressure) transfer printing, sanitary products such as napkins and diapers, waste disposal products such as ostomy packs, etc. because of their water solubility. Medical supplies such as blood-sucking sheets, temporary substrates such as seedling sheets, seeding tapes, and base fabrics for embroidery. [0003] In particular, in the unit packaging use of chemicals such as pesticides or detergents, there are advantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B65D85/00C08L29/04
CPCC08K3/30C08J2329/04C08K5/0016C08J5/18C08K5/053C08L29/04B65D85/00
Inventor 北村秀一水谷知由长谷川充广
Owner MITSUBISHI CHEM CORP
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