摘要:
A process for removing residual monomer from an emulsifier-containing aqueous dispersion of a solid vinyl chloride polymer having a surface tension of less than 60 dyne/cm., which comprises continuously admixing the polymer dispersion with steam in a fluid flow pipe under a pressure of 150-600 torr at a flow velocity of 1-20 m./sec., and passing said admixture at an exit velocity of 30-100 m./sec. horizontally into and along the walls of a degasification tank having a pressure 30-200 torr lower than the pressure in said flow pipe to evaporate residual monomer.
摘要:
An improved process for the production of emulsifier-containing vinyl chloride polymers suitable for hard processing, the particle diameter of 90% of which is more than 63 .mu., by polymerization of vinyl chloride and optionally monomers copolymerizable therewith in an aqueous emulsion in the presence of water-soluble catalysts and alkali salts of carboxylic acids as emulsifiers at pH 9.5-11.5 and spray-drying the thus-obtained latex, is characterized by conducting the polymerization in a dispersion containing at least 45% by weight of monomers with sodium or potassium salts of fatty acids of 8-18 carbon atoms as emulsifiers to a conversion of at least 80%, and, during the spray-drying step, reducing the pH to 6.0-8.0.
摘要:
The rheological properties of plastisols of powdered polymerizates produced by polymerizing vinyl chloride or a mixture of vinyl chloride and a copolymerizable monomer in an aqueous emulsion in the presence of a water-soluble catalyst and an alkali salt of a fatty acid as the polymerization emulsifier and spray drying the resultant polymerizate, are improved by treating the powdered polymerizate with water in a weight ratio of from 1:2 to 1:15 and then drying.
摘要:
The method of preparing synthetic powders containing emulsifiers having good paste qualities by spray-drying polymer dispersions through a two-fluid atomizer having a spray ratio of about 1.6 to 5.0 kg. of spray air for each kg. of dispersion is improved. The polymer dipersions are prepared by emulsifying vinyl chloride monomer or a mixture of vinyl chloride monomer and unsaturated polymerizable compounds and polymerizing the monomers to produce polymers and copolymers of vinyl chloride. The improvement in paste qualities of the powders is achieved by introducing the spray dried powder into an air jet having a velocity from about 330 to 550 meters per second and having a weight ratio of gas to solids ranging from 1:10 to 5:1.
摘要:
Improved PVC polymers are prepared by an emulsion polymerization process using an emulsifier mixture comprising:(a) 70-30% by weight of an alkyl sulfate of the formula R--OSO.sub.3 Me wherein R is alkyl of 10-18 carbon atoms and Me is Na or K; and(b) correspondingly 30-70% by weight of at least one member selected from the group consisting of(i) 0-65% by weight of an alkyl ether sulfate of the formula R--(OCH.sub.2 --CH.sub.2).sub.n --OSO.sub.3 Me wherein n is an integer of 1-5 inclusive and R and Me have the above-indicated values, and(ii) 0-60% by weight of a sodium alkyl sulfonate wherein the alkyl chain is of 10-20 carbon atoms.
摘要:
An improved process for the aqueous emulsion polymerization of vinyl chloride to be spray-dried and thus form paste-yielding polymers wherein the polymerization is conducted in an emulsion containing at least 45% by weight of monomers together with an emulsifying amount of alkali metal fatty acid salts of 8-18 carbon atoms at a pH of 9.5-11.5, and wherein the pH is reduced to a value between 6 and 7.5 prior to spray-drying or to a value between 4 and 7.5 during the spray-drying step.
摘要:
Paste-forming vinyl chloride polymers are prepared using an emulsifier system of:(a) an alkali metal or ammonium salt of a fatty acid, alkylsulfonic acid, alkylarylsulfonic acid or a sulfosuccinic acid ester in quantities of 0.2 to 3.0 by weight with respect to the quantity of monomers,(b) a straight chain or branched C.sub.12 -C.sub.20 alkanol in quantities of 50 to 200% by weight with respect to the amount of surface active agent (a) used,(c) water and optionally,(d) a monomer-soluble catalyst. The emulsifier system is homogenized by means of homogenizing apparatus, and, subsequently is mixed with the monomer. Polymerization ensues. Pastes based on this polymer exhibit low viscosities, a near Newtonian flow behavior and good storage stability.
摘要:
A tubular food casing based on cellulose, which on its inner surface has a coating which comprises lecithin and at least one of alginate, chitosans, and casein, has improved peelability from its contents.
摘要:
A tubular or web-shaped casing material resistant to mold fungus comprising cellulose and a fungicidal content of glycerol monolaurate. Alkali metal salts of fatty acids and/or alkyl-, aryl- and/or alkyl-aryl-sulfonates are preferably used as the emulsifier. Also disclosed is a process for manufacturing the casing material described above and a fungicidal agent for cellulose casings comprising glycerol monolaurate.
摘要:
The nozzle plate of an ink jet print head is made of glass to provide a desirable wetting property for a stable meniscus of the ink column and the front surface of the plate is coated with a non-wetting material such as metal or plastic to prevent ink deposits at the front surface around the orifice. Any ink deposits at such front surface would adversely affect the ejection of ink droplets.