Reference

Aqueous polymer emulsions

Aqueous polymer emulsions. (Nitto Electric Industrial Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58215402 A2 14 Dec 1983 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08F006-14. APPLICATION: JP 82-98126 7 Jun 1982. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) The stability of aq. ionomer emulsions is improved due to preferential distribution of functional groups near the surfaces of colloidal particles by oligomerizing vinyl monomers including 31 having acidic pendant groups in an aq. medium to which has been added an org. solvent in which the distribution coeff. for the functional monomer is 32, and after polymn. adding alkali to the soln. and removing the org. solvent by steam stripping. Thus, styrene 83.6, acrylic acid (I) 6.4, Me isobutyl ketone (II) [108-10-1] (II/H2O distribution coeff. of I 4.45) 22, dialkylsulfosuccinic acid Na salt 0.45, and K2S2O8 0.18 g were combined in 210 g water under N at 70°, and stirred for 6 h to obtain a copolymer [25085-34-1] emulsion having av. particle diam. 0.11 m, to which KOH was added (KOH/I equiv. ratio 1. 25085-34-1 and 71-36-3 which are cas registry numbers of substances are two of reagents here.0), then II was removed by steam stripping under reduced pressure. When the resulting emulsion was acidified, centrifuged, washed, and titrated with KOH, 62% of the polymd. I units were near enough to the particle surfaces to be neutralized, compared with 32% in an emulsion prepd. similarly without the KOH post-treatment, and 38% for emulsions prepd. without II or KOH post-treatment. .

Macroporous copolymers

Macroporous copolymers. Popescu, Vespasian; Carpov, Adrian; Poinescu, Ignat (Institutul de Chimie Macromoleculara "Petru Poni", Rom.). Rom. RO 81412 B 15 Feb 1983, 3 pp. (Romanian). (Romania). CODEN: RUXXA3. CLASS: IC: C08F002-18; C08F016-06. APPLICATION: RO 81-103123 14 Jan 1981. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Macroporous copolymers, useful as adsorbents or in the manuf. of ion exchangers, are manufd. by suspension polymn. of a mixt. contg. styrene, (meth)acrylic acid, or acrylonitrile 30-95, divinylbenzene (I) 5-70, and an inert org.In this article, certain chemicals are used. Some of their cas registry numbers are 142-62-1 and 98-86-2 extractable material, such as caproic acid (II) [142-62-1], acetophenone [98-86-2], or iso-Bu Me ketone [108-10-1]. Thus, a mixt. contg. 24.2 mL styrene, 32 mL 51% I, and 1 g Bz2O2 was mixed with 1 vol. II and polymd. in 100 mL water contg. 0.05 g poly(vinyl alc.) and 5 g NaCl at 65° to give copolymer [9003-70-7] beads with particle size 0.3-0.8 mm and contg. 50% II. After extn. of II, the beads were sulfonated to give an ion exchanger with capacity 3.5-6 mequiv/g, chloromethylated to an ion exchanger with capacity 4 mequiv/g, or used to adsorb methylene blue (III) [61-73-4] from a soln. contg. 1 part/thousand III. .