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Rubber modified styrenic copolymers and their use in forming oriented articlesRelated 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, Mixing Of Solid Block Or Block-type Copolymer With Other Solid Polymer; Mixing Of Said Polymer Mixture With A Chemical Treating Agent; Mixing Of A Block Or Block-type Copolymer With Sicp Or With Spfi; Or Processes Of Forming Or Reacting; Or The Resultant Product Of Any Of The Above OperationsRubber modified styrenic copolymers and their use in forming oriented articles description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070043169, Rubber modified styrenic copolymers and their use in forming oriented articles. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED CASE [0001] This is a Continuation-In-Part of Non-Provisional U.S. Ser. No. 11/034,084 filed on Jan. 12, 2005, which was published on Jul. 13, 2006 as U.S. Publication No. 2006/0155063 A1, pertaining to rubber modified styrenic copolymers and their use in disposable card applications. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention is directed to rubber modified styrenic copolymers and their use in making thermoplastic articles. More particularly, the present invention relates to oriented, i.e., uniaxially oriented and biaxially oriented, thermoplastic articles, e.g., extruded sheets, cast films, and blown films, and compositions comprising said rubber modified styrenic copolymers, e.g., rubber modified styrene methyl methyacrylate copolymers, and which thermoplastic articles may be used to form multi-layer structures. [0004] 2. Description of the Prior Art [0005] It is known to provide rubber modified styrenic copolymers, for example, rubber modified styrene methyl methacrylate copolymers. U.S. Pat. No. 4,772,667 to Biletch et al. discloses a thermoplastic polymer that includes a styrenic monomer, an acrylate, a methacrylate and a block copolymer. [0006] U.S. Pat. No. 5,290,862 to Blasius discloses a polymer alloy that contains from 30 to 83 weight percent of a brittle polymer; from 3 to 50 weight percent of a rubbery polymer; and from 15 to 67 weight percent of a ductile polymer, provided that the ductile polymer and the rubbery polymer are at least compatible. [0007] U.S. Pat. No. 5,891,962 to Otsuzuki et al. discloses a transparent, rubber-modified styrene resin that contains 70 to 96 parts by weight of a copolymer formed of 20 to 70 wt. % of styrene monomer units and 30 to 80 wt. % of alkyl (meth)acrylate monomer units and 4 to 30 parts by weight of a rubbery polymer. The rubbery polymer is dispersed in the copolymer as particles and the copolymer and the rubbery polymer have substantially the same refractive index. [0008] Heretofore, the above described thermoplastic polymer compositions have not been used in sheet or film applications because they do not provide the required clarity, stiffness, impact strength, resilience and flexural durability properties. [0009] It would be desirable to provide a low cost thermoplastic sheet or film material that provides sufficient stiffness, resilience and flexural durability properties. [0010] Monovinyl and vinyl aromatic-based resins, such as for example, styrene based resins, i.e. polystyrene-based resins, are well known and widely employed for producing foams and oriented articles for use in food packaging, toys, small appliances, compact discs, and audio/video cassette casings. Processes used to manufacture such articles involve extrusion, injection molding, blow molding, and thermoforming applications. [0011] Oriented film or sheet may also be made from styrenic polymers. Examples of oriented articles, e.g. films, sheets, or tubes are disclosed in U.S. Pat. Nos. 4,386,125; 5,322,664; 5,756,577; and 6,107,411. [0012] U.S. Pat. No. 4,386,125 issuing to Asahi Kasei Kogyo Kabushika Kaisha, discloses a transparent film, sheet, or tube of a block copolymer or a block copolymer composition having excellent low-temperature shrinkage of not less than 15% in terms of a heat shrinkage factor at 80.degree. C. in at least one direction and good mechanical properties. The block copolymer has a melt flow of 0.001 through 70 grams/10 min. and comprises an aromatic vinyl hydrocarbon polymer block having a number average molecular weight of 10,000 through 70,000 and a polymer block composed mainly of a conjugated diene, and a residual group of a coupling agent or a poly functional initiator such as an organo polylithium compound. [0013] U.S. Pat. No. 5,322,664 discloses a method and apparatus for making a clear single layer polystyrene non-foam film for use as a label on containers. A blend of general purpose polystyrene and styrene-butadiene or styrene butyl acrylate is extruded from an annular extruder die orifice to form a frustoconical tube which is stretched before cooling air is applied to form a clear film that has machine direction orientation and cross direction orientation that can be used as a shrinkable label on containers. During the extrusion stage, the polystyrene has flow rates of about 8-10 (grams/10 min. condition G) and VICAT softening temperatures of about 220 to 225.degree. F. [0014] U.S. Pat. No. 5,756,577 was issued on May 26, 1998 to Villarreal et al. and was assigned to Group Cydsa, S.A. de C.V. This patent claims a heat shrinkable thermoplastic film or sheet comprising a block copolymer of styrene-butadiene, wherein the amount of polymerized butadiene units in the copolymer constitutes from about 1 to about 50% by weight of the composition. The film or sheet has a tensile strength of about 372 kg/cm.sup.2 in the machine direction and about 255 kg/cm.sup.2 in the transverse direction, and a shrinkage value at 130.degree. C. of about 44% for the machine direction and about 0% for the transverse direction. [0015] U.S. Pat. No. 6,107,411 was issued on Aug. 22, 2000 to Toya et al. and was assigned to Denki Kagaku Kogyo Kabushiki Kaisha. This patent disclosed a block copolymer consisting essentially of a vinyl aromatic hydrocarbon and a conjugated diene, which is excellent in transparency, stiffness, impact resistance, and spontaneous shrinkage resistance; a composition comprising such a block copolymer, and heat shrinkable films prepared by orienting them. The block copolymer satisfies certain conditions such as a specific weight ratio of the vinyl aromatic hydrocarbon to the conjugated diene in the block copolymer, a specific molecular weight of the block copolymer, a specific storage modulus, a specific block proportion of the vinyl aromatic hydrocarbon polymer, and a specific proportion of chains consisting of repeating units of the vinyl aromatic hydrocarbon. [0016] A process for making an extruded oriented sheet is well known in the art and is discussed further herein below. It is also known to those skilled in the art that the control of the film or sheet thickness, the temperature of the film, and the draw ratios are important parameters that define the film properties. Generally, materials having high melt strength and retaining their orientation are considered better film or sheet forming materials than those having lower melt strength and not retaining their orientations. SUMMARY OF THE INVENTION [0017] The present invention provides an oriented, i.e. uniaxial or biaxial, thermoplastic article comprising a composition comprising a continuous phase and a dispersed phase, wherein: [0018] A) the continuous phase comprises a polymer composition resulting from the polymerization of a monomer mixture comprising (i) from about 25 parts by weight to 75 parts by weight of a styrenic monomer and (ii) from about 25 parts by weight to 75 parts by weight of an alkyl (meth)acrylate monomer, wherein the alkyl group is a C.sub.1 to C.sub.12 linear, branched or cyclic alkyl group, in the presence of the dispersed phase; and [0019] B) the dispersed phase comprises from about 2 parts by weight to about 50 parts by weight of one or more block copolymers selected from the group consisting of diblock and triblock copolymers of styrene-butadiene, styrene-butadiene-styrene, styrene-isoprene, styrene-isoprene-styrene, partially hydrogenated styrene-isoprene-styrene, for a total of 100 parts by weight of the combination of A) and B), and [0020] wherein said oriented thermoplastic article is selected from the group consisting of sheet and film, and has a thickness ranging from about 0.02 mm to about 0.50 mm, a tensile strength ranging from about 15 Mpa to about 70 Mpa as measured by ASTM D 882, an impact value ranging from about 0.05 ft. lb/mil to about 1.0 ft. lb/mil as measured by ASTM D 3763; and a Haze value less than 10% as measured by ASTM D 1003. [0021] The invention also provides a process for preparing an oriented, i.e. uniaxial or biaxial, thermoplastic article, the steps comprising: Continue reading about Rubber modified styrenic copolymers and their use in forming oriented articles... Full patent description for Rubber modified styrenic copolymers and their use in forming oriented articles Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Rubber modified styrenic copolymers and their use in forming oriented articles 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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