摘要:
Oberflächenleimungsmittel für Papier enthaltend wäßrige oder wäßrig-alkoholische Alkali-, Amin- oder Ammoniumsalzlösungen von Copolymerisaten aus Maleinsäureanhydrid und Diisobutylen und gegebenenfalls einem Vinylmonomeren der Formel in der H, -CH₃, -C₂H₅, -OR₂, -OCOCH₃, -CH₂OH, -CH₂-O-COCH₃, R₁ H, -CH₃ und R₂ Alkyl bezeichnen, wobei die Anhydridgruppen der Copolymerisate zu etwa 3 bis etwa 20 Mol-%, bezogen auf die Anhydridgruppen, mit aliphatischen Monoalkoholen mit 1 bis 12 C-Atomen bisverestert sind.
摘要:
A water repellent composition comprising an emulsion prepared by emulsifying in water (A) a wax having a melting point of from 40 to 90°C and (B) an olefin-maleic anhydride derivative in the presence of (C) a water-soluble alkaline compound and/or a nonionic emulsifier.
摘要:
0 When flocculating an aqueous suspension of suspended solids using a high molecular weight synthetic polymeric flocculant the shear stability of the flocs is increased if the polymeric material includes polymeric particles of below 10 u.m dry size. The flocculated solids can therefore be subjected to shear without increasing the amount of discrete suspended solids in the aqueous medium and generally they are suspended to shear by shearing the aqueous medium containing them, either before dewatering, generally on a centrifuge, piston press or belt press, or by continuously agitating them, for instance in a chemical reaction medium. The polymeric material is generally formed by mixing into water polymeric particles made by reverse phase or emulsion polymerisation in the presence of added cross linking agent. Alternatively particles insolubilised by insoluble monomer may be used. A reverse phase dispersion of water soluble polymer may be used if the particles remain undissolved, eg if they are added in the absence of an oil in water emulsifying agent.
摘要:
@ A latex that is devoid of formaldehyde-containing monomers in polymerized form, does not evolve formaldehyde nor decomposes to produce formaldehyde is used in the production of impregnated or treated paper and woven and nonwoven fabrics. The latex is produced by polymerizing a monomer charge containing at least one principal monomer and a crosslinking agent combination consisting of 0.1 to 10 weight parts of a monounsaturated dicarboxylic acid containing 4 to 6 carbon atoms and 0.1 to 10 weight parts of an amide containing 3 to 8 carbon atoms that does not produce formaldehyde. based on a total of 100 weight parts of all monomers that are polymerized. The articles made with the cured latex are characterized by softness, high wet tensile strength, toughness and other physical properties that reflect a different balance of properties.
摘要:
Paper making process with improved retention and binding of fillers and second grade fibers. It is characterized by the use of an amphoteric mucous like compound as binder. This compound is the reaction product between cationic starch of low charge density and an anionic polymer of high charge density as carboxymethyl cellulose. The compound has amphoteric and mucous characters and should be used for paper making, while in a unique transient structure. This structure is characterized by filler particles being enclosed and finely distributed in droplets of the highly hydrated but substantially water-insoluble mucous compound. According to the invention this transient structure may further be reorganized to a less hydrated and more resistant gel structure, still enclosing the filler. This gel structure can stand the draining forces on a paper machine wire. This structural reorganization is achieved by reaction with colloidal inorganic polymers of very high surface charge as polysilicic acid and polyaluminium compounds. The process yields papers of high strengths and filler retentions of more than 90% at a single fire passage even at extreme filler contents of 30-60% of the paper weight.
摘要:
@ This invention relates to impregnated oil filter substrate and to oil filters containing such impregnated substrates that require a single cure and can pass a hot oil immersion test, said filter substrate being impregnated with a water-based binder comprising a latex containing at least 20% polymerized vinyl chloride in the latex solids, said latex being a copolymer of vinyl chloride, 30 to 60% lower alkyl acrylate, and one or more comonomers selected from acrylic acid and N-methylol acrylamide, said comonomers being used in an amount of up to 5%, based on the weight of the monomers used to make the latex; said binder also containing 5 to 20 parts of a cross-linking resin per 100 weight parts of latex solids and 5 to 20% catalyst for the cross-linking resin based on the weight of the cross-linking resin.