| 摘要 |
The invention relates to a novel process for producing coloured polypropylene compositions having a high content of ²-modification, wherein polypropylene is melt blended with at least one inorganic pigment and at least one ²-nucleating agent, wherein
a1) polypropylene is melt blended with at least one inorganic pigment or with a first concentrate comprising the at least one inorganic pigment to obtain a coloured polypropylene and
a2) the coloured polypropylene is melt blended with at least one ²-nucleating agent or with a second concentrate comprising the at least one ²-nucleating agent to obtain the coloured ²-nucleated polypropylene composition or
b1) polypropylene is melt blended with at least one ²-nucleating agent or with a second concentrate comprising the at least one ²-nucleating agent to obtain a ²-nucleated polypropylene and
b2) the ²-nucleated polypropylene is melt blended with at least one inorganic pigment or with a first concentrate comprising the at least one inorganic pigment to obtain the coloured ²-nucleated polypropylene composition or
c) a third concentrate is produced by melt blending a first concentrate comprising the at least one inorganic pigment and a second concentrate comprising the at least one ²-nucleating agent and the polypropylene is melt blended with the third concentrate to produce the coloured ²-nucleated polypropylene composition or
d) a first concentrate comprising the at least one inorganic pigment and a second concentrate comprising the at least one ²-nucleating agent are melt blended with the polypropylene to obtain the coloured ²-nucleated polypropylene composition. |
