Modified ethylene-vinyl alcohol copolymer, gas barrier resin, and molded article of the same
a technology of ethylenevinyl alcohol and ethylenevinyl alcohol, which is applied in the direction of synthetic resin layered products, pipes, tyre parts, etc., can solve the problems of interior bending fatigue resistance, heat resistance and bending fatigue resistance, and achieve superior gas barrier properties, and heat resistance and bending fatigue resistance. the effect of superiority
Inactive Publication Date: 2010-02-25
YOKOHAMA RUBBER CO LTD
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Benefits of technology
[0016]The modified ethylene-vinyl alcohol copolymer of the present invention is superior in gas barrier property, heat resistance, and bending fatigue resistance. Because the modified ethylene-vinyl alcohol copolymer of the present inve
Problems solved by technology
Ethylene-vinyl alcohol copolymers have superior gas barrier property, b
Method used
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example 7
[0053]80 parts by weight of anhydrous maleate-modified EPM (Tafmer® MP-0620 made by Mitsui Chemicals, Inc.) were added to 100 parts by weight of the modified ethylene-vinyl alcohol copolymer of Example 3 and melt kneaded to prepare a gas barrier resin. Upon evaluation, the resin had a bending fatigue number of 52000, melting temperature of 160° C., and air permeability coefficient of 32.
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Abstract
Ethylene-vinyl alcohol copolymers have superior gas barrier properties, but are inferior in bending fatigue resistance. The present invention improves bending fatigue resistance without reducing the gas barrier property and heat resistance. An ethylene-vinyl alcohol copolymer having an ethylene content of 20 to 50 percent by mole is modified by incorporating 0.01 to 1% mol of a structural unit expressed by the following formula (3):
wherein, n indicates an integer of 2 to 5, m indicates an integer of 10 to 20, and R1 indicates a C1 to C20 aliphatic hydrocarbon group provided that R1 may contain a mercapto group, thioester group, sulfenamide, vinyl group, methacryloxy group, or acryloxy group. The modified ethylene vinyl alcohol copolymer may be used as a gas barrier resin and this gas barrier resin may be shaped or laminated and used in various applications such as in pneumatic tires and hoses.
Description
TECHNICAL FIELD[0001]The present invention relates to a modified ethylene-vinyl alcohol copolymer, more particularly relates to a gas barrier resin comprising the modified ethylene-vinyl alcohol copolymer and a molded article prepared from the same, particularly a pneumatic tire and a hose.BACKGROUND ART[0002]Ethylene-vinyl alcohol copolymers have superior gas barrier property, but have the defect that they are interior in bending fatigue resistance. To improve on this, there is known a method of modifying an ethylene-vinyl alcohol copolymer with an epoxy compound. See Japanese Unexamined Patent Publication No. 2003-231715.SUMMARY OF INVENTION[0003]Technical Problem[0004]However, if modifying an ethylene-vinyl alcohol copolymer with an epoxy compound, the bending fatigue resistance will be improved, but the gas barrier property and heat resistance (melting point) will tend to drop. The present invention addresses the matter of improving the drawback of an ethylene-vinyl alcohol copo...
Claims
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Patent Timeline
Login to view more IPC IPC(8): B32B27/08C08F210/02
CPCB32B27/08B32B27/30B60C1/0008C08F8/42B60C2005/145F16L2011/047F16L11/08C08F8/02C08F216/06B32B27/18B32B27/20B32B27/26B32B27/285B32B27/302B32B27/304B32B27/306B32B27/308B32B27/32B32B27/34B32B27/365B32B27/40B32B1/00B32B1/08B32B2250/24B32B2270/00B32B2307/306B32B2307/50B32B2307/7242B32B2597/00B32B2605/00Y10T428/31573Y10T428/31913Y10T428/31855C08F210/02C08F230/08C08J5/00
Inventor MOROOKA, NAOYUKI
Owner YOKOHAMA RUBBER CO LTD
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