摘要:
A polymeric bead having radius R wherein the polymer comprises 0.3% to 20% by weight, based on the weight of the polymer, of polymerized units of one or more multifunctional vinyl monomer and 80% to 99.7% by weight, based on the weight of the polymer, of polymerized units of one or more monofunctional vinyl monomer, (a) wherein the polymerized units of multifunctional vinyl monomer have radial distribution factor MR of 0.9 to 1.1, and (b) wherein some of the vinyl groups in the polymerized units of multivinyl monomer are unreacted, and the unreacted vinyl groups have a radial distribution factor VR of 2.5 or higher.
摘要:
본 발명에서는 염화비닐계 중합체 제조용 단량체를 중합개시제, 분산제 및 수용성 셀룰로오스 에테르의 존재 하에 현탁중합시키는 단계를 포함하며, 상기 분산제는 검화도가 다른 2종 이상의 폴리비닐 알코올의 혼합물을 포함하고, 상기 폴리비닐 알코올 혼합물의 몰 평균 검화도가 76몰% 내지 80몰%이며, 상기 수용성 셀룰로오스 에테르는 겔화점(gel point)이 60℃ 내지 90℃며, 중합 개시 전 또는 중합전환율 70% 이내에 투입되는 것인 염화비닐계 중합체의 제조방법 및 이에 따라 제조되는 염화비닐계 중합체가 제공된다.
摘要:
A process for preparing a (meth)acrylate comprising preparing an aqueous phase by combining water, one or more stabilizing agents, and one or more surfactants; preparing an oil phase by combining one or more free radical initiators, one or more monomers capable of undergoing radical polymerization, one or more crosslinking and/or graft-linking monomers, and stearyl methacrylate and/or lauryl methacrylate, wherein the free radical initiator is capable of partitioning preferentially into the oil phase; combining the aqueous and oil phases and mixing to form a suspension having oil droplets ranging in size from 1 to 10 microns; raising the temperature of the suspension to effect an initial polymerization forming a core polymer is provided.
摘要:
Gegenstand der Erfindung ist die Verwendung von in Wasser re- dispergierbaren Polymerpulver-Zusammensetzungen mit kationischer Funktionalität als Flockungshilfsmittel, beispielsweise für die Entwässerung von mit Feststoffen beladenen Wassern oder Abwässern.
摘要:
Cross-linked polymeric microparticles having a volume average particle size diameter of from about 0.05 to about 10 μιη and comprising from about 0.01 to about 5 mol% of one or more hydrolytically labile, crystallisable cross-linking structural units based on the total structural unit content of the polymeric microparticles and wherein the cross-linking structural units are derived from one or more hydrolytically labile, crystallisable cross-linking monomers having a number average molecular weight in the range of from about 1,500 to about 40,000 Daltons and comprise at least one polyester chain having at least five -RC(0)0- ester groups in a linear arrangement wherein the R groups each represent an alkanediyl group or a substituted alkanediyl group and wherein the cross-linking monomers have at least two sites of ethylenic unsaturation. The microparticles also comprise structural units derived from a hydrophilic monomer. When a dispersion of the microparticles in an aqueous fluid is injected into a hydrocarbon-bearing formation, the labile cross-linking structural units hydrolyze thereby releasing free polymer chains that are soluble or dispersible in the aqueous fluid such that a viscosified aqueous solution is generated within the formation,
摘要:
Die Erfindung betrifft ein schäumbares Perlpolymerisat bestehend aus (Meth)acrylnitril, (Meth)acrylsäure, copolymerisierbaren latenten Treibmitteln und optional (Meth)acrylsäureestern, dessen Herstellung über Suspernsionspolymerisation sowie dessen Verwendung für die Herstellung von Schäumen. Mit einem solchen Perlpolymerisat ist es zum Beispiel möglich, auf einfache Art und Weise ein In-Mould-Foaming durchzuführen und somit Produkte direkt in der Form des angestrebten Werkstücks herzustellen. Diese Werkstücke eignen sich hervorragend als Bauelemente in Raum-, Luft-, Wasser-und Landfahrzeugen und für sonstige Konstruktionselemente.
摘要:
Verfahren zum Herstellen einer wässrigen Klebstoffdispersion, wobei eine Dispersion aus einem Schichtsilikat mit SiO 2 -Anteil und einem hydrophoben Ethylen/ Polyvinylalkohol-Copolymer als Schutzkolloid hergestellt wird und in Gegenwart dieser Dispersion Vinylester und gegebenenfalls Comonomere polymerisiert werden.