摘要:
A method for making a particulate filled polymeric matrix composite film includes mixing a polymeric matrix material with a dispersion of particulate filler in a carrier liquid to form a casting composition and adjusting the viscosity of the casting composition to retard separation of the particulate filler from the composition. A layer of the viscosity-adjusted casting composition is cast on a substrate and the layer is consolidated to form the particulate filled polymer matrix composite film. Films made by the method include very thin, e.g less than 1.0 mil, fluoropolymeric matrix films highly filled with very small diameter, preferably spherical, particles for use as, e.g. dielectric substrate materials in laminar electrical circuits.
摘要:
A polyester aqueous dispersion having excellent properties in waterproof, weatherproof, processibility and adhesion, which provides a large allowance for controlling liquid physical properties by post treatment and is advantageous in making dry powders from the dispersion, and an efficient method for preparing the aqueous dispersion at low costs in a simple manner. The polyester aqueous dispersion comprising (i) a water-insoluble polyester and (ii) a polyester containing a sulfonate group bound to a polymer in a concentration of 0.1 to 1.5 mmol equivalents when calculated as —SO3− group per gram of the polymer, and method for preparing a polyester aqueous dispersion comprises a step of melt-kneading a resin composition comprising the water-insoluble polyester (i) and polyester (ii) and a step of phase inversion of adding water or a basic aqueous solution to the molten kneaded mixture thereby to shift the resin composition into the aqueous dispersion.
摘要:
Stable aqueous dispersions or emulsions can be prepared by merging into a mechanical disperser a stream of a molten or liquid disperse phase with a stream of a molten or liquid continuous phase to form a dispersion or emulsion. The molten or liquid disperse phase stream contains a polymer that is preferably a solid at room temperature, but molten at some advanced temperature. The polymer is formed in a molten state or formed and melted by a continuous reaction process such as an extrusion process, including melt extrusion or compound extrusion. It has been discovered that low polydisperse submicron sized dispersion can be prepared by the method of the present invention.
摘要:
A low-solvent aqueous binder includes: a water-insoluble synthetic resin component A; and an emulsifier resin B in a mass ratio of A to B of from 70:30 to 30:70. The emulsifier resin B is a reaction product of a water-insoluble synthetic resin B1 that includes hydroxyl groups as functional groups, a synthetic resin B2 that includes carboxyl groups as functional groups, and a neutralizing agent for the carboxyl groups of B. The amount of the neutralizing agent is such that the neutralizing agent is able to neutralize from 5 to 200% of the carboxyl groups of B. A process for preparing a low-solvent aqueous binder includes: mixing the water-insoluble synthetic resin component B1 comprising hydroxyl functional groups and the synthetic resin B2 in bulk or dissolved in an organic solvent to form a mixture; removing the solvent by applying subatmospheric pressure and heating until the content of the mixture is at least 85% by mass; maintaining the mixture at a temperature from 90° to 150° C. until the reaction product of the mixture is homogeneously emulsifiable in a mass ratio of 3 parts of resin to 7 parts of water; neutralizing the reaction product by adding a neutralizing agent in an amount sufficient to neutralize from 5 to 200% of carboxyl groups that have remained following the reaction; adding the water-insoluble synthetic resin A in a mass ratio of A to B of from 70:30 to 30:70, and emulsifying the mixture in water.
摘要:
A process for making an aqueous emulsion of self-emulsifiable polyolefin employs a high molecular weight functionalized polyolefin and a hydrophilic polymer. The aqueous emulsion can be used to prepare a hybrid polyolefin-polyurethane dispersion useful, inter alia, as an adhesion-promoting coating for polymers such as the polyolefins.
摘要:
The invention provides a thermosetting aqueous primer composition that includes a polyurethane polymer, an acrylic polymer, and a crosslinking component that is reactive with at least one of the polyurethane polymer and the acrylic polymer. The polyurethane polymer has a glass transition temperature of 0° C. or less. The acrylic polymer has a glass transition temperature that is at least about 20° C. higher than the glass transition temperature of polyurethane resin. The invention further provides a composite coating having as a primer layer a cured layer of the primer composition of the invention and having at least one topcoat layer.
摘要:
An aqueous emulsion composition is provided that includes, as the dispersoid, a (co)polymer that contains at least one monomer unit selected from ethylenic unsaturated monomers and dienic monomers, and, as the dispersant, (A) a polyvinyl alcohol (co)polymer, and (B) a condensate of an alkali metal salt of an aromatic sulfonic acid with formaldehyde in a ratio, (A)/(B), of from 100/0.05 to 100/100 in terms of the solid content of the two. The composition is characterized by its fluidity such that the apparent viscosity of the composition is prevented from being lowered relative to the increase in the shear rate of the composition, and that the apparent viscosity of the composition is increased relative to the increase in the shear rate thereof. In addition, the composition has excellent high initial adhesiveness and viscosity-increasing ability.
摘要:
A one-step direct method of making a high molecular weight functionalized polyolefin aqueous emulsion is provided. In this one-step direct method, a functionalized polyolefin having a molecular weight of at least 10,000, a fatty acid, a base, a surfactant, and water are heated in a pressure reaction vessel to a temperature above the emulsification temperature of the polyolefin with agitation for a period of time sufficient to form an aqueous emulsion. This high molecular weight functionalized polyolefin aqueous emulsion can be added to a sizing composition and applied directly onto glass fibers in the glass fiber manufacturing process.
摘要:
A process for producing an aqueous dispersion of a polymer in an aqueous medium having a viscosity below 10 Pa.s, in which the polymer is dispersed in an aqueous medium in an extruder at a temperature above 100° C., the pressure inside the extruder being maintained above atmospheric pressure so that the aqueous medium does not boil inside the extruder.
摘要:
There is provided a dispersing emulsion excellent in storage stability and mechanical stability, particularly an asphalt modifier of an water based dispersing emulsion, which can be mixed with a hot asphalt or an asphalt emulsion, and can improve rutting resistance, toughness, and flexibility at a low temperature without losing workability. There is provided a dispersing emulsion of a thermoplastic elastomer, which is emulsified and dispersed in the presence of at least one nonionic emulsifier selected from the group consisting of a styrenated phenol poly(alkylene oxide), a poly(alkylene polyamine) poly(alkylene oxide), polyalcohol fatty acid esters, polyalcohol fatty acid esters poly(alkylene oxide), and a benzylated phenol poly(alkylene oxide).