C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
241/135, 403/60
C08J 9/36 (2006.01) B01D 37/02 (2006.01) B01D 39/04 (2006.01) B01D 39/16 (2006.01) B29B 9/00 (2006.01) B29B 13/10 (2006.01) B29B 17/04 (2006.01) B29C 44/00 (2006.01) C02F 1/28 (2006.01) C08J 3/12 (2006.01) C08J 11/04 (2006.01) C08L 23/02 (2006.01) C08L 25/04 (2006.01) D21H 17/57 (2006.01)
Patent
CA 1093749
ABSTRACT OF INVENTION Involved are (I) expanded, thermoplastic, non-brittle as expanded polymers selected from a styrene-polymer and a poly- olefin from polyethylene to poly-methylpentene, said expanded polymer being in form of micro-bits which (a) are from about 40 to about 325 microns long and from about 20 to about 325 microns wide, (b) are substantially completely to entirely com- pletely free (i) of intact cells of expanded polymer bit-pieces from which they were produced and of (ii) any uniformity in out- line of individual micro-bit particles, and (c) in density are from about 85 percent of, to about substantially the same as, the specific unexpanded polymer from which there was provided the aforesaid expanded polymer; and (II) a method of preparing these micro-bits by impelling a mixture of them in water in a confined comminuting zone through a circular path by repeated impact by a plurality of impact surfaces spaced axially and radially apart from one another and rotated about the circular path's axis from about 4700 to about 8000 r.p.m. thereby driving the bit-pieces against cornered edges of a plurality of from circular to substantially rectangular orifices arranged in screening array in an arcuate plane, thus repeatedly tearing, ripping and shearing the desired micro-bits from bit-pieces of the starting expanded polymer.
295012
Gowling Lafleur Henderson Llp
Klein Max
LandOfFree
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