Rotational moulded products are prepared by producing a mixture of a polyolefin and optionally at least one additive, extruding this mixture in melt form through orifices in a die, pelletizing the mixture extruded through the orifices to form micropellets having a particle size distribution D(v, 0.5
Rotational moulded products are prepared by producing a mixture of a polyolefin and optionally at least one additive, extruding this mixture in melt form through orifices in a die, pelletizing the mixture extruded through the orifices to form micropellets having a particle size distribution D(v, 0.5) of 0.1 to 1 mm, and a value of the ratio of D(v, 0.9)-D(v, 0.1) to D(v, 0.5) of no more than 1, drying the micropellets to a residual water content of no more than 1% weight, and if desired packaging the micropellets.
대표청구항▼
1. A rotational moulding composition comprising a pelletized olefin polymer having a particle size distribution D(v, 0.5) of 0.1 to 1 mm, a value of the ratio of D(v, 0.9)-D(v, 0.1) to D(v, 0.5) of no more than 1, and a water content of less than 0.1% wt.2. A composition as claimed in claim 1 having
1. A rotational moulding composition comprising a pelletized olefin polymer having a particle size distribution D(v, 0.5) of 0.1 to 1 mm, a value of the ratio of D(v, 0.9)-D(v, 0.1) to D(v, 0.5) of no more than 1, and a water content of less than 0.1% wt.2. A composition as claimed in claim 1 having a D(v, 0.9)-D(v, 0.1)/D(v, 0.5) ratio of up to 0.8.3. A composition as claimed in claim 1 having a water content of less than 200 ppm by weight.4. A composition as claimed in claim 1 having a water content of less than 150 ppm by weight.5. A composition as claimed in claim 1 having a water content of less than 100 ppm by weight.6. A composition as claimed claim 1 comprising at least one additive.7. A composition as claimed in claim 1 comprising at least one additive selected from coloring agents, stabilizers, antioxidants, UV absorbers, antistatics, lubricants and fillers.8. A composition as claimed in claim 6 or claim 7 wherein said at least one additive is distributed homogeneously within the pellets of said pelletized polymer.9. A composition as claimed in claim 1 wherein said olefin is a homo or copolymer of ethylene or propylene.
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이 특허에 인용된 특허 (19)
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Schrijver Jan (Roosteren NLX) Vossebeld Arnold (Beek NLX), Polymer powder compositions, particularly polyethylene powder compositions and objects to be made and made thereof.
Malucelli Decio (Ferrara ITX) Cocola Fausto (Turin ITX) Forcucci Francesco (Konigstein DEX), Polyolefin compositions and process for their preparation.
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