http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-5024070-B2
Outgoing Links
Predicate | Object |
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classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02E60-10 |
classificationIPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B29K105-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B29L7-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B29K23-00 |
classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08K5-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01M2-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L23-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B29C55-14 |
filingDate | 2008-01-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
grantDate | 2012-09-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
publicationDate | 2012-09-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
publicationNumber | JP-5024070-B2 |
titleOfInvention | Porous polypropylene sequential biaxially stretched film and method for producing the same |
abstract | <P>PROBLEM TO BE SOLVED: To provide a film having high thickness uniformity, high porosity and high air permeability. <P>SOLUTION: A molten polypropylene resin composition containing a nucleating agent of β-crystal is extruded through a T-die, the extruded melt is cooled down on a chilling roll, then, the resultant raw sheet is stretched in the lengthwise direction, and the resultant sheet is stretched in the widthwise direction, to form a biaxially oriented film, wherein the degree of orientation of β-crystal of the lengthwise stretched sheet is adjusted to less than 0.3 by the following process (I) and/or the process (II), and the resultant sheet is optionally annealed, then stretched in the widthwise direction. The process (I): a polypropylene resin composition including acicular crystals of a specific β-crystal-including nucleic agent is molten in a temperature range higher than the melting point of polypropylene to lower than the temperature at which the β-crystal nucleic agent dissolves in the molten polypropylene, then extruded out from the T-die at the same temperature; and the process (II): the neck-in rate is adjusted to 25 to 55% in the longitudinal direction. <P>COPYRIGHT: (C)2008,JPO&INPIT |
priorityDate | 2001-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 608.