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US 12,454,588 B2Granted
Powder type polypropylene resin and method for preparing the same
AssigneeLG Chem, Ltd.
InventorsSeong Min Chae, Jihwa Ye, Kyung Seop Noh, Heekwang Park
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Abstract
According to this invention, there are provided powder type polypropylene resin wherein flowability in a hooper and feeding stability in the feeding zone of an extruder are improved through morphology optimization such as decrease in fine powder content, narrow particle size distribution, increase in average particle size, and high melting point, and the like, and a method for preparing the same.
Claims12
A polypropylene resin in a powder form comprising homo polypropylene, and satisfying requirements (i) to (v), wherein:
- (i) a melt index measured under load of 2.16 kg at 230° C. according to ASTM D1238 is 500 to 3000 g/10 min,
- (ii) a melting point is 155° C. or more,
- (iii) SPAN according to the following Mathematical Formula 1 is 0.6 or less,
- (iv) an average particle size D50 is greater than 1200 μm and 1600 μm or less, and
- (v) a content of fine powder having particle size less than 500 μm is 2 wt % or less, based on the total weight of polypropylene resin:
- SPAN=(D90−D10)/D50 [Mathematical Formula 1]
- wherein, in Mathematical Formula 1, D50 is a particle size of the homo polypropylene at 50% point of cumulative distribution, D90 is a particle size of the homo polypropylene at 90% point of cumulative distribution, and D10 is a particle size of the homo polypropylene at 10% point of cumulative distribution, in the cumulative distribution of particle number according to the particle size of the homo polypropylene.
4 more elements
Dependencies are inferred from the claim text.