Appeal No. 2004-0824
Application 09/879,422
THE INVENTION
The appellants claim low-dust granules of plastic additives
comprising solid epoxides. Claim 21 is illustrative:
21. Low-dust granules of plastics additives having a
particle size distribution of between 1 mm and 6 mm as defined in
accordance with ISO 3435 and a loose bulk density of greater than
500 g/l comprising
a) a phenolic antioxidant, an organic phosphite or
phosphonite, a phosphonate, a sterically hindered amine or a UV
absorber, individually, or a mixture of these compounds and
b) 10-90% by weight of at least one bispenol A diglycidyl
ether, which granules are prepared by a process which comprises
heating
a) a phenolic antioxidant, an organic phosphite or
phosphonite, a phosphonate, a sterically hindered amine or a UV
absorber, individually, or a mixture of these compounds, and
b) at least one at least one [sic] bisphenol A diglycidyl
ether which is solid at room temperature,
to an extent such that at least 80% by weight of the
bisphenol A diglycidyl ether has melted, pressing the melt
through a plate provided with dies or perforations, the die or
perforation diameter being between 1 and 10 mm, and chopping the
resulting strands in the plastic state to form granules,
wherein the temperature before the outlet die (at the die
head) is between 60-160°C.
THE REFERENCES
Molenaar et al. (Molenaar) 4,446,086 May 1, 1984
Argus Chemical Corp. (GB ‘637) 1 358 637 Jul. 3, 1974
(Great Britain patent specification)
Ciba-Geigy AG (PCT ‘377) WO 94/29377 Dec. 22, 1994
(PCT application)
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