Composition suitable for thermoformable sheets and articles made therefrom
A molding board and thermoforming technology, applied in the field of thermoplastic compositions, can solve the problems of inability to provide stiffness, toughness and optical properties
Inactive Publication Date: 2007-10-03
DOW GLOBAL TECH LLC
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
While polypropylene solutions can provide acceptable stiffness and toughness when used with appropriate impact modifiers, they often do not provide the balance of stiffness, toughness and optical properties required for many applications
Method used
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Embodiment 1-4
[0115] Example
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Abstract
The invention relates to a thermoformable sheet having a thickness of at least 300 micrometers comprising a blend of: (A) from 5 to 20% by weight of a propylene-ethylene copolymer having substantially isotactic propylene sequences, the propylene-ethylene copolymer having a melt flow rate from 4 to 30 g / 10 min and comprising at least 70% by weight units derived from propylene and from about 10 to 20% by weight units derived from ethylene; and (B) from 80 to 95% by weight of a polypropylene having a melt flow rate of from 2 to 8 grams / 10 minutes, wherein the melt flow rate of the blend is from 2 to 7 grams / 10 minutes and wherein the blend exhibits: (1) room temperature Charpy toughness of at least 15 KJ / mCharpy toughness of at least 2 KJ / m<2>, and (4) a value for haze of less than 40%.
Description
technical field [0001] The present invention relates to thermoplastic compositions suitable for use in the manufacture of thermoformed articles exhibiting good optical properties, toughness and stiffness. Furthermore, the invention relates to boards comprising the composition of the invention. Furthermore, the invention relates to thermoformed articles, preferably perishable food products, such as trays for meat and fish, comprising the composition of the invention. Background technique [0002] The packaging industry uses thermoformed trays to hold a variety of perishable food products. One of the biggest uses of these types of trays is to hold fresh meat. In the past, local packers and grocers have used expanded polystyrene (EPS) trays to hold fresh meat from in-store packers. However, the meatpacking industry is undergoing drastic changes whereby meat is slaughtered at remotely located plants and packed fresh into case-ready containers for shipment to grocers without t...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C08L23/10C08L23/12B29C51/00B29C48/07
CPCY10T428/31913B29L2031/712Y10T428/31938B29K2995/0082B29K2023/12B29K2995/0067B29K2105/256B29C51/002C08L23/08C08L23/12B29K2995/0089Y10T428/1352B29C47/0021B29C47/14B29C51/08C08L23/10B29C48/08B29C48/305B29C48/07C08L2666/06
Inventor A·罗泽尔-乌里斯E·托里斯O·亨斯克
Owner DOW GLOBAL TECH LLC