Polypropylene resin composition, precision-injection-molded object, mold for molding optical member, and process for producing optical member
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United States of America Patent
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Nov 1, 2022
Grant Date -
May 9, 2019
app pub date -
Apr 25, 2017
filing date -
Apr 28, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is a polypropylene resin composition which contains a polypropylene-based polymer containing, as monomer units, propylene and at least one copolymerization monomer of ethylene or α-olefins with carbon atom number of 4 or more. Proportion of the monomer units derived from the copolymerization monomer in the polypropylene-based polymer is 2 to 10% by mass based on the mass of the polypropylene-based polymer. A crystallization half-time at 110° C. of the polypropylene resin composition is 20 seconds or shorter.
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International Classification(s)
- C08F:MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONL....
- B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....
- B29K:INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, ....
- B29L:INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RE....
- C08L:COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08K:USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUB....
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