C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/448, 403/61,
C08F 291/00 (2006.01) C08F 2/18 (2006.01)
Patent
CA 1334471
Highly crosslinked polymer particles, which may be porous, consisting essentially of a non- hydrophilic polymer of a polymerizable monomer mixture comprising at least 20% by weight of at least one non-hydrophilic, crosslinking polyvinyl monomer and satisfying the following conditions (a) to (e): (a) the average particle diameter (rm) is 0.1-1.0 µm and the proportion of particles having particle diameters falling within the range of 0.9rm - 1.1rm to the whole of particles is 80% by weight or more, (b) the polymer particles are substantially insoluble in toluene and substantially non- swellable with toluene, (c) when the polymer particles are heated on a thermobalance in a nitrogen atmosphere while elevating the temperature at a rate of 10°C/min, the temperature at which the weight of the particles reduces by 10% is at least 380°C, (d) when the polymer particles are heated at 300°C for 5 hours in a nitrogen atmosphere, the weight reduction is at most 30%, and (e) the polymer particles are not melt-adhered to one another at 200°C in a nitrogen atmosphere. Said highly crosslinked polymer particles can be produced by adding a polymerizable monomer mixture comprising at least 20% by weight of at least one non- hydrophilic, crosslinking polyvinyl monomer to an aqueous dispersion containing a non-crosslinked, low molecular weight polymer particles having a weight average molecular weight of 500-10,000 as a dispersoid, with a non-reactive solvent in a proportion of not more than 1 part by weight per part by weight of the polymer- izable monomer mixture, the proportion of the polymerizable monomer mixture plus the non-reactive solvent to the non-crosslinked, low molecular weight polymer particles being 4 to 20 parts by weight per part by weight of the non-crosslinked, low molecular weight polymer particles, and then subjecting the polymerizable monomer mixture to radical emulsion polymerization with stirring.
573259
Hattori Masayuki
Kasai Kiyoshi
Tadenuma Hiroshi
Yasukawa Shiro
Fetherstonhaugh & Co.
Jsr Corporation
LandOfFree
Highly crosslinked polymer particles and process for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Highly crosslinked polymer particles and process for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Highly crosslinked polymer particles and process for... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1181245