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Gas-barrier resin compositionRelated Patent Categories: Synthetic Resins Or Natural Rubbers -- Part Of The Class 520 Series, Natural Rubber Compositions Having Nonreactive Materials (dnrm) Other Than: Carbon, Silicon Dioxide, Glass Titanium Dioxide, Water, Hydrocarbon, Halohydrocarbon, Ethylenically Unsaturated Reactant Admixed With A Preformed Reaction Product Derived From: (a) At Least One Polycarboxylic Acid, Ester, Or Anhydride; (b) At Least One Polyhydroxy Compound; And (c) At Least One Fatty Acid Glycerol Ester, Or A Fatty Acid Or Salt Derived From A Naturally Occurring Glyceride, Tall Oil, Or A Tall Oil Fatty Acid, At Least One Solid Polymer Derived From Ethylenic Reactants Only, Polyvinyl AlcoholGas-barrier resin composition description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070021556, Gas-barrier resin composition. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to resin compositions and films and other molded articles of the resin compositions that have excellent gas barrier properties. [0003] 2. Description of the Related Art [0004] Polymers having functional groups such as hydroxyl group in the molecule show various physical properties such as hydrophilicity or adhesiveness derived from the functional groups. Thus, they can be used as, for example, structural components for functional packaging materials, functional molding materials, sheets, films, fibers, coating agents, functional alloys and blends. A variety of such polymers have been synthesized. For example, PCT International Publication No. WO 99/50331 discloses a polymer represented by following Formula (2): wherein X and Y are each hydroxyl group, carboxyl group, carboxylic ester group, amido group, nitrile group or carbonyl group; R is an alkyl group having 1 to 5 carbon atoms or aforementioned X; a and b are each an integer of 0 to 6 and the total of a and b is from 2 to 7, prepared by ring-opening metathesis polymerization of a cycloalkene compound containing 7 to 12 carbon atoms and having a functional group, such as 5-cyclooctene-1,2-diol; and a polymer prepared by hydrogenation of the double bond in the molecular chain of the polymer just mentioned above. [0005] Such polymers can be molded by melt process and are very excellent resin materials that show high gas barrier properties at high humidity. In particular, a polymer prepared by hydrogenation of the polymer of Formula (2) in which X and Y are hydroxyl groups is useful as a constitutional component for packaging materials having high oxygen-barrier properties (PCT International Publication No. WO 00/18579). SUMMARY OF THE INVENTION [0006] To develop higher gas barrier properties, a resin constituting a gas barrier material should preferably be crystallized sufficiently. However, since the polymer represented in Formula (2) above may have a relatively low crystallization rate, it may require heat treatment for a long time in molding and processing and thereby invite higher cost. Accordingly, an object of the present invention is to provide a resin composition that shows high gas barrier properties at high humidity and can be molded by melt processes. [0007] The present inventors have found that a resin composition containing a specific polymer mentioned below and a vinyl alcohol polymer can have a remarkably increased crystallization rate and can be subjected to heat treatment in a shorter time in molding and processing without deteriorating its gas barrier properties. The present invention has been accomplished based on these findings. [0008] In one embodiment, the present invention provides a resin composition including a polymer (A) mainly containing a structural unit represented by the following Formula (1): wherein m represents an integer of 2 to 10; X.sup.1 and X.sup.2 are each hydrogen atom, hydroxyl group or a functional group that can be converted into a hydroxyl group, wherein at least one of X.sup.1 and X.sup.2 is a hydroxyl group or a functional group that can be converted into hydroxyl group; R.sup.1, R.sup.2 and R.sup.3 are each a hydrogen atom, a hydroxyl group, a functional group that can be converted into hydroxyl group, an alkyl group, an aryl group, an aralkyl group or a heteroaryl group, wherein the plural R.sup.1s may be the same as or different from each other; and a vinyl alcohol polymer (B). The present invention further provides a molded article containing the resin composition. [0009] The resin composition according to the present invention can be molded by melt processes, has high gas barrier properties, especially against oxygen gas, even at high humidity and can develop high gas barrier properties even when it is subjected to heat treatment in a short time in molding and processing. The resin composition can yield molded articles having excellent gas barrier properties. [0010] Further objects, features and advantages of the present invention will become apparent from the following description. DETAILED DESCRIPTION OF THE INVENTION [0011] The resin composition contains a polymer (A) comprising a structural formula represented by following Formula (1): wherein m represents an integer of 2 to 10; X.sup.1 and X.sup.2 are each hydrogen atom, hydroxyl group or a functional group that can be converted into a hydroxyl group, wherein at least one of X.sup.1 and X.sup.2 is hydroxyl group or a functional group that can be converted into hydroxyl group; R.sup.1, R.sup.2 and R.sup.3 are each a hydrogen atom, a hydroxyl group, a functional group that can be converted into hydroxyl group, an alkyl group, an aryl group, an aralkyl group or a heteroaryl group, wherein the plural R.sup.1s may be the same as or different from each other. [0012] In Formula (1), X.sup.1 and X.sup.2 are each hydrogen atom, hydroxyl group or a functional group that can be converted into hydroxyl group, wherein at least one of X.sup.1 and X.sup.2 is hydroxyl group or a functional group that can be converted into hydroxyl group. [0013] Examples of the functional group that can be converted into hydroxyl group include epoxy group, and a hydroxyl group protected by a protecting group. The epoxy group may be a three-membered ring formed by the carbon atom to which X.sup.1 is bound, the carbon atom to which X.sup.2 is bound and oxygen atom. [0014] Examples of the protecting group of hydroxyl group mentioned above include alkyl groups such as methyl group, ethyl group and t-butyl group; alkenyl groups such as allyl group; aralkyl groups such as benzyl group; aryl groups such as phenyl group; alkoxyalkyl groups such as methoxymethyl group, methoxyethyl group and ethoxyethyl group; acyl groups such as acetyl group, propionyl group and benzoyl group; alkoxycarbonyl groups such as methoxycarbonyl group, ethoxycarbonyl group, t-butoxycarbonyl group, phenyloxycarbonyl group and benzyloxycarbonyl group; silyl groups such as trimethylsilyl group and t-butyldimethylsilyl group. [0015] For easy protection and deprotection, preferred examples of the hydroxyl-protecting group are alkoxyalkyl groups such as methoxymethyl group, methoxyethyl group and ethoxyethyl group; acyl groups such as acetyl group, propionyl group and benzoyl group; alkoxycarbonyl groups such as methoxycarbonyl group, ethoxycarbonyl group, t-butoxycarbonyl group, phenyloxycarbonyl group and benzyloxycarbonyl group; and silyl groups such as trimethylsilyl group and t-butyldimethylsilyl group. Particularly, the hydroxyl group is preferably protected by an acyl group such as acetyl group, propionyl group or benzoyl group, because such a group can be industrially prepared at low cost. [0016] In Formula (1), both of X.sup.1 and X.sup.2 are preferably a hydroxyl group and/or a functional group that can be converted into hydroxyl group. By using the polymer (A) mainly comprising the structural unit represented by Formula (1), the resin composition can have a higher gas barrier properties. [0017] R.sup.1, R.sup.2 and R.sup.3 in Formula (1) are each hydrogen atom, hydroxyl group, a functional group that can be converted into hydroxyl group, an alkyl group, an aryl group, an aralkyl group or a heteroaryl group. The plural R's may be the same as or different from each other. [0018] Examples of the functional group that can be converted into hydroxyl group for use as R.sup.1, R.sup.2 and R.sup.3 include those exemplified as the functional groups that can be converted into hydroxyl group X.sup.1 and X.sup.2. [0019] The alkyl group is preferably an alkyl group having one to five carbon atoms. Examples of such alkyl group include aliphatic chain alkyl groups such as methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group and n-pentyl group; and alicyclic alkyl groups such as cyclopentyl group. [0020] Examples of the aryl group include phenyl group, naphthyl group, biphenyl group, phenanthryl group, anthryl group, triphenylenyl group and pyrenyl group. [0021] Examples of the aralkyl group include benzyl group, phenethyl group, naphthylmethyl group and biphenylmethyl group. Continue reading about Gas-barrier resin composition... Full patent description for Gas-barrier resin composition Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Gas-barrier resin composition patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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