Biaxially oriented multi-layer film using propylene-ethylene random block copolymer as a surface layer
A random copolymer, biaxially oriented technology, applied in the field of biaxially oriented multilayer films, can solve the problem of not being able to meet at the same time, and achieve the effect of good transparency and anti-blocking
Active Publication Date: 2010-11-24
JAPAN POLYPROPYLENE CORP
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- Abstract
- Description
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Problems solved by technology
However, these improved technologies have not been able to simultaneously satisfy all the following functional requirements, namely heat seal strength, low temperature heat sealability, transparency, smoothness and anti-blocking properties
Method used
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preparation example 1
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Abstract
A polyolefin based biaxially oriented multi-layer film having at least one surface layer comprise of the propylene-ethylene random block copolymer; The propylene-ethylene random block copolymer obtained through sequential polymerization catalyzed by a metallocene component which is composed of 30 to 70 wt % of a propylene-ethylene random copolymer component having an ethylene content of 1 to 7 wt% produced in the first step of the polymerization and from 70 to 30 wt % of a low crystallinity or an amorphous propylene-ethylene random copolymer component produced in the second step of the polymerization having an ethylene content of 6 to 15 wt % higher than that of the polymer component obtained in the first step, wherein that shows a single peak at 0 DEG C. or lower in the temperature-losstangent (tandelta) curve obtained by dynamic mechanical analysis (DMA).
Description
Biaxially oriented multilayer film using propylene-ethylene random block copolymer as skin layer technical field The present invention relates to a biaxially oriented multilayer film using a propylene-ethylene random block copolymer as a skin layer, which has excellent heat seal strength and low-temperature heat sealability, transparency and blocking resistance, and is superior in these properties A good balance has been reached. Background technique Polyolefin films have excellent physical properties, transparency, processability, economy, and low environmental load, so they are widely used as packaging materials in many fields, mainly for food, daily necessities, medicines, sundries, etc. In addition, packaging materials are required to have multiple functions, so many kinds of films are used, such as oriented films with excellent strength and hardness, heat-shrinkable films for adhesive packaging, air-impermeable films for storage, and boil-sterilized Distilled membra...
Claims
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IPC IPC(8): B32B27/32C08F297/08B29C55/12B29K23/00B29L9/00
CPCB32B27/32B32B27/08B32B2307/31B32B2307/412B32B2307/518B32B2307/704B32B2307/746B32B2439/70B32B2439/80
Inventor 田谷野孝夫高桥邦宣香西育北出慎一水上茂雄平山浩一
Owner JAPAN POLYPROPYLENE CORP
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