Pelletized brominated anionic styrenic polymers and their...

B - Operations – Transporting – 29 – B

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B29B 13/10 (2006.01) B29B 9/00 (2006.01) C08J 3/12 (2006.01)

Patent

CA 2566982

Despite the frangibility of additive-free granules of brominated anionic styrenic polymer, it has been found possible by use of special mechanical processing to provide pellets of unadulterated brominated anionic styrenic polymer having a bromine content of at least about 50 wt% and in which at least about 70 wt% (preferably at least about 75 wt%) of the pellets are retained on a standard US No. 40 sieve and no more than about 30 wt% (preferably no more than about 25 wt%) are retained on a standard US No. 5 sieve. In preferred embodiments such pelletized anionic styrenic polymer is brominated anionic polystyrene having a bromine content of at least about 67 wt%, e.g., in the range of about 67 to about 71 wt%. Also preferred are pelletized brominated anionic styrenic polymers in which the melt flow index (ASTM D 1238-99) at 220~C, 2.16 kg is at least 4 g/10 min and preferably is at least 5 g/10 min. Another embodiment of this invention is a method of preparing pelletized unadulterated brominated anionic styrenic polymer which method comprises: A) forming strands of molten unadulterated brominated anionic styrenic polymer; B) submitting said strands to cooling and downwardly directed forced air flow on a porous conveyor belt whereby said strands are broken into pellets; and C) causing said pellets to drop into a classifier that removes fines from the pellets.

En dépit de la fragilité des granulés sans additif de polymère styrénique anionique bromé, il a été rendu possible par l~utilisation d'un processus mécanique spécial de fournir des pastilles de polymère styrénique anionique bromé non altéré ayant un contenu en brome d'au moins 50 % en poids et dans lequel environ 70 % en poids (préférablement au moins 75 % en poids) des boulettes sont retenues sur un tamis standard US N·40 et pas plus de 30 % en poids (préférablement moins de 25 %) sont retenues sur un tamis standard US N·5. Dans des cas préférés un tel polymère styrénique anionique en pastilles est un polystyrène anionique bromé ayant un contenu en brome d'au moins 67 % en poids, c'est-à-dire, c'est à dire compris entre 67 % en poids et 71 % en poids. Sont aussi préférés des polymères styréniques anioniques bromés en pastilles dans lesquels l'indice de fluage (ASTM D 1238-99) à 220·C, 2,16 kg est au moins de 4g/10 min et préférablement de 5g/10 min. Une autre utilisation de cette invention est un procédé de préparation de polymère styrénique anionique bromé inaltéré en pastilles dont le procédé comprend les étapes consistant à: A) former des brins de polymère styrénique anionique bromé inaltéré fondu; B) soumettre lesdits brins au refroidissement et le flux d'air dirigé vers le bas sur une bande transporteuse poreuse où lesdits brins sont cassés en pastilles; et C) faire tomber lesdites pastilles dans un trieur qui sépare les poudres des pastilles.

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