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Rubber modified styrenic copolymers and their use in forming oriented articles

a technology of styrenic copolymer and oriented articles, which is applied in the directions of thin material handling, transportation and packaging, etc., can solve the problems of not providing the required clarity, stiffness, impact strength, resilience and flexural durability properties, and the above-mentioned thermoplastic polymer compositions have not been used in sheet or film applications

Inactive Publication Date: 2007-02-22
INEOS NOVA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides an oriented thermoplastic article comprising a continuous phase and a dispersed phase. The continuous phase is made from a monomer mixture containing a styrenic monomer and an alkyl (meth)acrylate monomer, while the dispersed phase is made from one or more block copolymers of styrene-butadiene, styrene-butadiene-styrene, or styrene-isoprene-styrene. The article has a specific thickness, strength, impact value, and haze value. The invention also provides a process for preparing the oriented thermoplastic article. The oriented article can be a sheet, film, or blown film."

Problems solved by technology

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0088] The test methods used to evaluate the uniaxial and biaxial sheets comprised of the rubber modified styrenic copolymer composition of the invention were:

Tensile Strength (Tensile Break)—ASTM D-882

Impact Strength (Dynatup Instrumentation)—ASTM D-3763

Haze—ASTM D-1003 (Samples were measured using a Color Quest® XE-Touch reflectance / transmittance spectrophotometer equipped with Universal Software® color quality control software, available from Hunter Associates Laboratory, Inc., Reston, Va.)

examples 1-6

[0089] Examples 1 through 6 pertain to extruded sheets comprised of the rubber modified styrenic copolymer composition of the invention. Examples 1 and 4 are comparative samples in that they were not subjected to an orientation process. Examples 2 and 5, which are inventive samples, were subjected to a uniaxial oriented process in the machine direction (MD) only; and Examples 3 and 6, which are also inventive samples, were subjected to a biaxial oriented process, i.e. in the machine direction (MD) and the transverse direction (TD).

[0090] These extruded sheets were prepared by the method that was discussed hereinabove, i.e. a thermoplastic composition in granulate form was fed into an extruder where the resin was heated to a molten state having a polymer melt temperature of about 230° C., and then extruded through a sheet T-die and onto a roll stack. The roll stack was operated such that the temperature of the material was above its Tg (glass transition temperature). For the uniaxia...

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Abstract

An oriented, i.e. uniaxial or biaxial, thermoplastic article, e.g. extruded sheet, blown film, and cast film, comprising a first component comprising a continuous phase and a dispersed phase, where A) the continuous phase contains a polymer composition resulting from the polymerization of a monomer mixture containing a styrenic monomer and an alkyl (meth)acrylate monomer in the presence of the dispersed phase; and B) the dispersed phase contains one or more block copolymer selected from diblock and triblock copolymers of styrene-butadiene, styrene-butadiene-styrene, styrene-isoprene, styrene-isoprene-styrene, partially hydrogenated styrene-isoprene-styrene, wherein the oriented thermoplastic article has a thickness ranging from 0.02 mm to 0.50 mm, a tensile strength ranging from 15 Mpa to 70 Mpa as measured by ASTM D 882, an impact value ranging between 0.05 ft. lb / mil to 1.0 ft. lb / mil as measured by ASTM D 3763, and a Haze value less than 10% as measured by ASTM D 1003.

Description

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...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L53/00
CPCC08F287/00C08L33/06C08L35/06C08L51/006C08L53/02C08L53/025C08L2666/24C08L2666/02C08L2666/04Y10T428/24479
Inventor KWOK, JOHN CHI HEEROBERTS, ROBERT D.
Owner INEOS NOVA