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Pre-expanded particles of polypropylene resin and inmolded foamed article using the same
| Details |
Inventors: Ogita, Tetsuya; Yamaguchi, Takema;
Assignee: Kaneka Corporation (Osaki, JP); Kaneka Texas Corporation (Pasadena, TX)
Primary Examiner: Wu; David W.
Assistant Examiner: Lee; Rip
Attorney, Agent or Firm: Armstrong, Westerman & Hattori, LLP
The present invention aims at preparing polypropylene resin pre-expanded particles capable of providing an inmolded expanded article which prevents pollution of a mold by polypropylene powder at molding, packed products from being damaged by friction due to vibration at transport, and powder generation at the same time. Polypropylene resin pre-expanded particles comprising a resin composition containing a fatty acid amide compound is used. |
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DETAILED DESCRIPTION The polypropylene pre-expanded particle of the present invention comprises a fatty acid amide compound in polypropylene as a basic resin.
As the fatty acid amide compound, a primary amide having 15 to 22 carbon atoms is preferably used.
In particular, erucic amide, oleic amide and stearic amide are useful.
An amount of the above fatty acid amide compound is 2.
5 to 15 parts by weight (hereinafter referred to as parts), preferably 3.
5 to 15 parts, more preferably 3.
5 to 10 parts, and most preferably 4.
0 to 8.
0 parts.
When the amount of the fatty acid amide co pound is less than 2.
5 parts, sufficient effect for preventing damage to products and powder generation cannot be achieved.
When it is more than 15 parts, there is an economical disadvantage that cost for preparing a resin is increased.
In addition, there arises a problem that extrusion becomes unstable, causing decline in productivity when a polypropylene resin is prepared into small particles for pre-expansion by using an extruder.
By using pre-expanded particles containing a fatty acid amide compound in the basic resin, powder generation is prevented in course of preparing the pre-expanded particles, which leads to prevention of pollution of a mold and the like at inmold expansion molding.
Examples of a basic resin used for polypropylene resin pre-expanded particles of the present invention are a propylene homopolymer, an ethylene-propylene random copolymer, an ethylene-propylene block copolymer, an ethylene-propylene-butene randomterpolymer, a propylene-chlorinated vinyl copolymer, a propylene-butene copolymer, a propylene-maleic anhydride copolymer and the like, which are preferably prepared by stereospecific polymerization.
These can be used alone or in combination of two or more.
Among these, ethylene-propylene random copolymers or ethylene-propylene-butene random terpolymers are preferable from the viewpoint of particularly excellent versatility.
The propylene resin of the present invention means a resin obtained by polymerizing propylene in a ratio of at least 80% by weight
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Adhesives and Rubbers 
