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Vinyl alcohol system polymer and film containing same

Inactive Publication Date: 2012-09-05
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, although the polyoxyethylene or polyoxypropylene-containing PVA and their films disclosed in these Patent Documents 1, 5 and 6 are excellent in water solubility at low temperatures, they tend to absorb moisture when they are placed under high humidity. The problem that the elastic modulus of the film is significantly lowered
In addition, it has excellent water solubility and strong affinity with water, so there are problems such as low water repellency when water droplets are attached to the surface of the film, and the attached part tends to shrink and easily forms defects.

Method used

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  • Vinyl alcohol system polymer and film containing same
  • Vinyl alcohol system polymer and film containing same
  • Vinyl alcohol system polymer and film containing same

Examples

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Embodiment

[0078] Hereinafter, the present invention will be specifically described by way of examples and comparative examples. In the following examples and comparative examples, "parts" and "%" refer to a basis of weight unless otherwise specified.

[0079] PVA (POA-modified PVA and unmodified PVA) obtained by the following preparation examples were evaluated by the following method.

[0080] [Saponification degree of PVA]

[0081] The degree of saponification of PVA is obtained by the method described in JIS-K6726.

[0082] [Solubility of PVA]

[0083] At room temperature, 4 g of POA-modified PVA was added to 96 g of distilled water, and stirred for 30 minutes. The obtained aqueous solution of POA-modified PVA was heated to 90° C. and stirred for 1 hour in this state, then cooled to room temperature, and filtered using a 105 mmφ metal mesh. After filtration, dry the metal mesh at 105°C for 3 hours, and measure the weight after cooling to room temperature in a desiccator to obtain...

preparation example 1

[0118] Preparation example 1 (preparation of PVA1)

[0119] In the 3L reactor that has the addition port of stirrer, reflux condensing pipe, nitrogen gas introduction pipe, comonomer dropping port and initiator, add vinyl acetate 750g, methyl alcohol 250g, the unsaturated monomer (mono Body A) 3.3 g, nitrogen replacement in the system was carried out for 30 minutes while blowing nitrogen. In addition, as a delay solution, an unsaturated monomer having a POA group (monomer A) was dissolved in methanol to prepare a comonomer solution having a concentration of 20%, and nitrogen replacement was performed by bubbling nitrogen. The temperature rise of the reactor was started, and when the internal temperature reached 60°C, 0.25 g of 2,2'-azobisisobutyronitrile (AIBN) was added to initiate polymerization. While the delay solution was added dropwise to make the monomer composition (ratio of vinyl acetate to monomer A) in the polymerization solution constant, the polymerization was ca...

preparation example 2～28

[0120] Preparation example 2~28 (preparation of PVA2~28)

[0121] Change the add-on of vinyl acetate and methyl alcohol as shown in table 1 and table 2, the kind (table 2) or the polymerization conditions such as the unsaturated monomer of POA group that use during polymerization, POA modified PVAc during saponification Saponification conditions such as the concentration of sodium hydroxide and the molar ratio of vinyl acetate unit, various POA modified PVAs (PVA2~28) were prepared by the same method as Preparation Example 1 except that.

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Abstract

Disclosed are a vinyl alcohol series polymer having a polyoxyalkylene group in a side chain, that is, a vinyl alcohol series polymer of a polyoxyalkylene denatured vinyl alcohol system polymer having an average viscometric degree of polymerization (P) of 200-5000, a degree of saponification of 20-99.99 mol%, and a denatured polyoxyalkylene amount (S) of 0.1-10 mol%, and a film containing same. Thus, it is possible to provide a polyvinyl alcohol series polymer that is water soluble and highly viscous, and a film having little decrease in the modulus of elongation when humidity is controlled ina high-humidity environment, and exhibiting water solubility with the film surface having excellent water repellency.

Description

technical field [0001] The present invention relates to a polyoxyalkylene-modified vinyl alcohol polymer and a film containing the same. More specifically, it relates to a water-soluble and highly viscous polyoxyalkylene-modified vinyl alcohol-based polymer, which has a lower water content when conditioned at high humidity and pulls A film exhibiting water solubility with little decrease in modulus of elasticity, excellent water repellency on the film surface. Background technique [0002] Vinyl alcohol polymers (hereinafter sometimes referred to as PVA), as one of the few crystalline water-soluble polymers, have excellent interface properties (interface properties) and strength properties, and are used in various adhesives, paper processing, fiber In addition to stabilizers for processing and emulsions, it plays an important role as a raw material for PVA-based films and PVA-based fibers. On the other hand, studies have been made on high-functionalization to improve speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/12C08F216/06C08F290/06C08G65/329
CPCC08L29/04C08J5/18C08F290/062C08L2205/05C08J2371/02C08G65/2648C08G81/025C08L71/02C08G65/33306C08G65/3322C08F8/12C08F218/08C08L2666/04C08F118/08
Inventor 新居真辅仲前昌人床尾万喜雄
Owner KURARAY CO LTD
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