摘要:
The absorbent cellulosic material in this invention comprises ethylenically unsaturated monomers, free radical initiator, crosslinkers, and distilled water. The objective of this invention is to develop absorbent material made from cellulose from bagasse that can absorb and retain extremely large amounts of liquid for using as a moisture retention aid for soil to increase the water retention of soils. It can increase crop quality and crop yield under drought stress. In addition, this invention can be used to grow indoor plants to reduce watering frequency.
摘要:
A rheology modifier including: a water-dispersible, alkali-swellable crosslinked polyacrylate copolymer including 0.02 to 5 weight percent of polysaccharide grafts, based on a total weight of the copolymer.
摘要:
The present invention relates to a process for producing polymer composites suitable for absorbing and storing aqueous liquids and to the polymer composites obtainable by this process. The invention further relates to the use of these polymer composites. The process comprises free-radical polymerization of a monomer composition M which a) 50 to 100% by weight, based on the total amount of monomers A and B, of at least one monomer A having one ethylenic double bond and at least one neutralizable acid group, b) 0 to 50% by weight of optionally one or more comonomers B which are different than the monomers A and have one ethylenic double bond, and c) 0 to 10% by weight, based on the total amount of monomers A and B, of at least one crosslinker C, wherein the polymerization of the monomer composition is performed in an aqueous suspension of a water-insoluble particulate substance S comprising cellulose or lignocellulose, the weight ratio of the monomer composition M to the substance S being in the range from 9:1 to 1:9; and wherein the monomers A used for polymerization are present in the aqueous suspension in neutralized, i.e. anionic, form to an extent of at least 10 mol%, frequently to an extent of at least 20 mol%, particularly to an extent of at least 30 mol% and especially to an extent of at least 35 mol%.
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Polymerisaten, die geeignet sind, wässrige Flüssigkeiten aufzunehmen und zu speichern, sowie die nach diesem Verfahren erhältlichen Polymerisate. Die Erfindung betrifft auch die Verwendung dieser Polymerisate. Das Verfahren umfasst die folgenden Schritte: i) vernetzende radikalische Polymerisation einer Monomerzusammensetzung (M), die a) wenigstens ein Monomer A, das eineethylenische Doppelbindung und wenigstens eine neutralisierbare Säuregruppe oder eine zu einer neutraliserbaren Säuregruppe hydrolysierbare Gruppe aufweist, b) gegebenenfalls ein oder mehrere, von den Monomeren A verschiedene Comonomere B, die eine ethylenische Doppelbindung aufweisen, und c) 0,05 bis 10 Gew.-%, bezogen auf die Gesamtmenge der Monomere A und B, wenigstens eines Vernetzers C umfasst, in Gegenwart wenigstens einer Polysaccharid enthaltenden Substanz (S), in einer wässrigen Flüssigkeit wobei das Gewichtsverhältnis der Monomerzusammensetzung (M) zu der Substanz (S) im Bereich von 9:1 bis 1:9 liegt; und ii) wenigstens teilweise Neutralisation der Säuregruppen und/oder Hydrolyse der zu neutralisierbaren Säuregruppen hydrolysierbaren Gruppen in dem in Schritt i) erhaltenen Polymerisat; wobei man die Polymerisation und/oder die Neutralisation in Gegenwart von Harnstoff durchführt.
摘要:
The present invention pertains to a process for the manufacture of a grafted fluorinated polymer comprising at least one grafted side chain comprising one or more glycosidic recurring units [polymer (F)], said process comprising polymerizing: - vinylidene fluoride (VDF), - optionally, one or more other fluorinated monomers [monomers (F)], and - optionally, one or more (meth)acrylic monomers [monomers (MA)], in the presence of at least one polysaccharide derivative [derivative (P)], said polysaccharide derivative having a dynamic viscosity of less than 15 mPa x s, as measured according to ASTM D445 at 20°C in an aqueous solution at a concentration of 2% by weight, and by further providing novel polymers (F) as defined above.