C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 57/00 (2006.01) C06B 23/00 (2006.01) C08J 9/20 (2006.01) C09D 7/12 (2006.01) C09D 11/02 (2006.01) D21H 21/54 (2006.01)
Patent
CA 2055203
A method for producing expandable thermoplastic microsheres by polymerisation in a reaction vessel of an ethylenically unsaturated monomer or a mixture of monomers in an aqueous suspension in the presence of a condensed propellant. In the method, the monomer or monomer mixture is suspended in the aqueous medium in the presence of a powder stabiliser which consists of a salt or hydroxide of any of the metals Ca, Mg, Ba, Fe, Zn, Ni or Mn. The powder stabiliser is insoluble in the aqueous medium at the pH the aqueous medium has at the polymerisation. The aqueous medium may also contain a co-stabiliser. The method further comprises the step of washing off the powder stabiliser from the microspheres after the polymerisation by lowering the pH of the aqueous medium by the addition of acid. Alternatively, amphoteric hydroxides can also be dissolved by a pH increase. The invention also relates to microspheres produced according to the method of the invention, and to the use thereof.
Casco Nobel Ab
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
Expandable thermoplastic microspheres and process for the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Expandable thermoplastic microspheres and process for the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Expandable thermoplastic microspheres and process for the... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1988273