Injection molded body having excellent barrier property
a technology of injection molding and barrier property, which is applied in the direction of packaging goods, synthetic resin layered products, transportation and packaging, etc., can solve the problems of insufficient extent, deterioration of polyolefins, and insufficient extent of polyolefins, and achieve excellent barrier properties, heat resistance and appearance, excellent delamination resistance, and excellent barrier properties.
Inactive Publication Date: 2012-04-05
MITSUBISHI GAS CHEM CO INC
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The solution provides injection molded articles with improved barrier properties, delamination resistance, and heat resistance, making them suitable for containers that require severe environmental conditions, such as those for food and drugs, while maintaining economic viability and design flexibility.
Problems solved by technology
However, the polyolefins tend to be deteriorated in barrier property against gases such as oxygen and are, therefore, unsuitable as containers for preserving contents that are apt to be adversely affected by oxygen, etc., or as containers for food or drugs which are required to exhibit a good keeping property under severe environmental conditions such as high-temperature conditions.
However, the barrier material to be blended must be dispersed in the polyolefins in a specific condition, so that the polyolefins tend to be improved in barrier property only to an insufficient extent.
In addition, these methods also have such a problem that molded articles obtained from the resin mixture tend to have a poor appearance owing to the polyamides that are locally present near a surface thereof.
More specifically, the method of the Patent Document 1 requires a biaxial stretch blow molding procedure, and the molded articles obtained without conducting the biaxial stretch blow molding procedure tend to be deteriorated in barrier property.
The production of the molded article having such a multilayer structure tends to be accompanied with difficulties in view of its structure and moldability and, therefore, has been rarely practiced from industrial viewpoints.
The method of the Patent Document 3 improves adhesion between the polyolefin layer and barrier layer, but requires a large amount of the expensive modified polyolefin to ensure sufficient adhesion between these layers.
In addition, this method has such a problem that the resulting molded article tends to be deteriorated in heat resistance owing to addition of the modified polyolefin thereto.
Method used
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Experimental program
Comparison scheme
Effect test
production example 1
Production of Polyamide Resin: A4
[0128]A jacketed 50-L reaction vessel equipped with a stirrer, a partial condenser, a cooler, a dropping tank and a nitrogen gas inlet pipe was charged with 14.2 kg (97.1 mol) of adipic acid and 1.0 kg (6.2 mol) of isophthalic acid which were previously accurately weighed, and then an inside of the reaction vessel was fully purged and replaced with nitrogen. While further flowing a small amount of nitrogen through the reaction vessel, the contents therein were uniformly melted at 160° C. to form a uniform slurry of the molten adipic acid and isophthalic acid. Then, 14.0 kg (102.6 mol) of m-xylylenediamine was continuously dropped into the obtained slurry over 1 h under stirring. During the dropping, an inside temperature of the reaction vessel was continuously raised to 247° C. Water distilled off during the dropping of m-xylylenediamine was discharged out of the reaction system through the partial condenser and the cooler. After completion of droppi...
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Abstract
A multilayer injection molded article comprising a layer of a barrier resin composition including (A) 10 to 70% by mass of a polyamide resin including a diamine constitutional unit 70 mol % or more of which is derived from m-xylylenediamine and a dicarboxylic acid constitutional unit 70 mol % or more of which is derived from a dicarboxylic acid containing a C4 to C20 α,ω-linear aliphatic dicarboxylic acid and isophthalic acid at a molar ratio of from 30:70 to 100:0, (B) 90 to 30% by mass of a modified polyolefin, and the like.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of and claims the benefits of priority to U.S. application Ser. No. 12 / 446,111, filed Apr. 17, 2009, which is a national stage of International Application No. PCT / JP2007 / 070432, filed Oct. 19, 2007. The contents of these applications are incorporated herein by reference in their entireties. The International Application is based on and claims the benefits of priority to Japanese Patent Application Nos. 2006-284766, 2006-284767 and 2007-038070.TECHNICAL FIELD[0002]The present invention relates to injection-molded articles having excellent barrier property and appearance, etc., and more particularly to multilayer injection molded articles that are excellent in barrier property, appearance, delamination resistance, heat resistance, etc., and single-layer injection-molded articles that are excellent in barrier property, appearance, etc.BACKGROUND ART[0003]Injection molding has been widely spread and ...
Claims
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IPC IPC(8): B32B27/00
CPCB29C49/12B65B1/00B29C2045/1648B29C2045/1664B29K2077/00B32B27/08B32B27/34C08L23/02C08L23/0815C08L51/06C08L77/02C08L77/06C08L2205/02B29C49/22B29C49/06B29C45/1684B29C45/1657B29C45/1642B29C45/0001B29B2911/14146B29B2911/1412B29B2911/14106B29B2911/14093B29B2911/1408B29B2911/14066B29B2911/14053B29B2911/1404B29B2911/14033B29B2911/14026B29B2911/1402C08L2666/02C08L2666/04C08L2666/14C08L2666/20C08L2666/06C08L2666/24Y10T428/31757B29C2949/3016B29C2949/302B29C2949/3024B29C2949/24B29C2949/28B29C2949/26B29C2949/22B29C2949/3008B29C2949/3012B29C2949/3028B29C2949/3036B29C2049/023B29C2949/0715B29C2049/7831B29C45/16B29C49/08
InventorSATO, KAZUNOBUMARUYAMA, KATSUYA
OwnerMITSUBISHI GAS CHEM CO INC