发明名称 |
Multilayer, stretched heat-sealable polypropylene film |
摘要 |
The invention relates to an oriented sealable polypropylene film combining an improved water vapor barrier effect with considerably reduced global migration for packaging purposes and having the following layer structure: A B C B A where a) C is a base layer of polypropylene and a hydrocarbon resin which has a molecular weight of up to about 2000 g/mol and a softening point above 130 DEG C., b) the B's are jacket layers of highly isotactic polypropylene (isotacticity >94%) free from hydrocarbon resin, the ratio between the thickness of a jacket layer and the thickness of the base layer being between 0.01 and 0.1, c) the A's are two surface layers of a heat-sealable polyolefin copolymer or terpolymer, these surface layers containing at least one antiblocking agent, a lubricant and an antistatic agent.
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申请公布号 |
US5441806(A) |
申请公布日期 |
1995.08.15 |
申请号 |
US19940205977 |
申请日期 |
1994.03.03 |
申请人 |
WOLFF WALSRODE AKTIENGESELLSCHAFT |
发明人 |
BRANDT, RAINER;REINERS, ULRICH;KRALLMANN, ANTON;BOEHNER, JUERGEN;NEELEN, NEELE |
分类号 |
B32B27/32;B65D1/00;B65D65/42;(IPC1-7):B32B7/12 |
主分类号 |
B32B27/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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