DE1569054C - Process for the production of a porous plastic mass containing a liquid - Google Patents

Description

3 4

Plasticizers used will mostly be removed by way of way. In general, it is purposeful Type of thermoplastic polymer determined. moderate, the bulk of the excess water Some polymers require a primary soft to separate by centrifugation. That coagulated Macher to convert the coagulated latex into a porous material can then be further processed by heating to form a plastic product, which is cohesive and flexible, to 5 steam the remaining water to be dried. form. In such cases, for example after drying, the coagulated mass

Polyvinyl chloride latex, a primary plasticization is required to heat the polymer particles on three contacts. It is therefore preferable to fuse a mixture to form a porous, coherent one of plasticizers, which comprises both primary and plastic products with plasticizers in the pores, secondary plasticizers, to form io. If the plasticizer serves as the main liquid that is contained in the coloring agent, the liquid can become trapped when pressure is squeezed out of the product's pores. In other or leaked to serve as color cases, the coagulated latex can become a self or reproductive material,
load-bearing flexible product can be coalesced without the final merging of the mass

that a primary plasticizer is present. Such a 15 preferably carried out by placing it in a heated The polymer is polyethylene, and in this case a shape of the desired shape can be introduced, it may be preferred to only have a secondary plasticizer. This way the shape of the product can be improved to use. In any case, the quantities and can be done when merging.

Types of Plasticizers Used Easily The following examples serve to further be selected to provide end products with various refinements of the invention.
Properties in terms of liquid content, flexibility,
To produce strength and the like. example 1

Generally provides a weight ratio

50:50 from polymer to plasticizer in the A mixture is

End products usable products. However, if a stronger, stiffer product is desired to disperse about 30 parts by weight of mine, the oil can be increased in about 70 parts by weight of an aqueous poly amount of polymer up to about 90 percent by weight of ethylene latex with a solids content of about or above. On the other hand, if a 45 ° / _{0 is} made.

greater liquid content and a more flexible product. The aqueous mass obtained is then precipitated

if desired, the amount of polymer 30 and most of the excess water can be reduced to 40% or below. It is removed by centrifugation,
thus it can be seen that the amounts of polymer The partially dried mass is then in a

and plasticizers are introduced into a desired shape via a relatively wide range rich without diminishing the advantages of the invention about 127 ° C heated for a few minutes until the polygoods Procedure can be varied. 35 merisate particles form a coherent porous mass

The most commonly used primary soft-fused are. The heating first removes the phthalate, adipate and sebacate esters, the remaining water is removed and then the resin and aryl phosphate esters. Merged into some suitable pri-
Common plasticizers include dibutyl phthalate, di- Example 2

ethyl phthalate, dicyclohexyl phthalate, dimethyl phtha- 40

lat, diphenyl phthalate, tributyl phosphate, tricresyl about 20 parts by weight of dioctyl phthalate and 20 parts

phosphate, diamyl phthalate, dibutyl sebacate, dicarbitol- parts by weight of castor oil are thoroughly converted into about 60 gephthalate, Tributoxyethyl phosphate, 2-pyrrolidone, parts by weight of an aqueous polyvinyl chloride latex disoctyl phthalate, Dioctyl adipate, dioctyl sebacate, alkyl pergated.

aryl phosphates, acetyl tributyl citrate and propylene 45 The aqueous mass obtained is then coagulated glycol. and the bulk of the excess water

Secondary plasticizers include a number removed by centrifugation.

of aliphatic and aromatic hydrocarbons. The coagulated material is then subjected to stifling. To be heated further for the purposes according to the invention, dried in order to evaporate the remaining water, which is particularly suitable secondary plasticizers. Then the mass in a form will hear mineral oils, castor oil and oleic acid. introduced and a few minutes at about 138 ⁰ C

Also other active ingredients, besides heated to the polyvinyl chloride particles on their colorants, can be introduced into the liquid in the pores of the contact points to form a porous plastic plastic. For example, it is possible to fuse the droplets of castor oil in the pores, including medicines, antiseptics, deodorants 55,
and the like are introduced during the manufacture of the porous products. B is ρ ie 1 3

The coagulation of the latex of the thermoplastic

Polymer can be carried out according to the usual procedures. The procedure of Example 1 is repeated,

for the coagulation of polymer latexes, and yet fluffed alkali blue (color index: acid the blue 110 or 119 used in the process according to the invention) is added as a colorant to the mineral oil. Special procedure is not critical. So can be introduced before mixing with the latex,
for example coagulation by adding a

Electrolytes, extraction with a solvent, example 4

Freezing or otherwise effected. 65

After coagulation, the material is a soft one. The procedure of Example 2 is repeated,

friable mass in considerable excess, however, becomes a black dye in the castor oil shot of water. This water can be dissolved in the usual before mixing with the latex.

The above examples all provide coherent, porous plastic bodies, which under impact or impact a Dispense liquid.

In Example 1, the plasticizer is mainly a secondary plasticizer for the polyethylene and serves as an enclosed liquid in which colorants or other active additives are dissolved or dispersed could be. In example 2 the plasticizer is a combination of primary and secondary Plasticizer for the polyvinyl chloride. The dioctyl phthalate solvates the plastic during the Melting. And gives it flexibility, while the secondary plasticizer, the castor oil, the fluid inclusions, iii the pores of the product that act as a carrier for the colorant or other materials serve that can be added.

Claims (5)

1 2 or a secondary plasticizer and one patent claim: primary plasticizer. Furthermore, it can be particularly advantageous to have a 1. Process for the preparation of a porous plasticizer mixed with a dye Plastic compound, which use a 5 in the pores. liquid plasticizer, which with others, with 'Furthermore, the fusing can be advantageous in these compatible substances can be combined, a form can be carried out, contains, characterized in that in the practical implementation of the invention the aqueous latex of a thermoplastic polymer according to the process becomes an aqueous latex of one meren in the presence of a plasticizer coagulating thermoplastic polymers and a plasticizer is liert and the coagulated latex is mixed after Ent- to form an aqueous mass, the removal of the water until the dispersed droplets of plasticizer melt, thermoplastic polymer is heated. the polymer coagulates, the water removed and the 2. The method according to claim 1, characterized in that the mass obtained is heated until the particles coagulate draws that as a polymer polyethylene or 15 thermoplastic material has grown together Polyvinyl chloride is used. (coalesced), d. H. at their contact points at 3. The method according to claim 1 or 2, characterized in that a flexible, porous, at least one, characterized in that a second part of the plasticizer contained in the pores of the plasticizer or a secondary soft plastic matrix are melted together as a plasticizer,
Makers and a primary plasticizer are used. The method according to the invention is suitable for use. special for the production of reproduction materials 4. Method according to one of the preceding rials, such as stamp pads, pressure rollers, Claims, characterized in that one with color-filled writing elements and the like. In these cases If a plasticizer is mixed with a dye, it is advantageous to add a colorant to the aqueous one is turned. 35 Add mass. It can be any combination of 5. The method according to any one of the preceding dyes, tints or pigments with Claims, characterized in that the mixture of plasticizers or the mixture of soft melts is carried out in a form. Makers are compatible, used as colorants will. The addition can be made directly to the latex or to the 30 plasticizers are made. A very satisfactory one The way it works is to dissolve an organic dye in the plasticizer.
The plasticizer itself can be added directly to the latex Different methods have long been used, or it can be added in one first Production of porous plastic masses dispersed or emulsified in the 35 aqueous medium and then Industry applied. Some of these will be mixed with the latex. Propellant used, which during the curing of the most diverse aqueous latices of thermoplastic Plastic with the formation of polymers located inside can be used as a starting material for borrowed cells or bubbles are volatilized. Can be used in the present invention. the other solid particles are used, which are produced in the 40 by emulsion or suspension polymerization Dispersed plastic and then formed latices after solidification of the corresponding monomers of the plastic removed by dissolution are particularly satisfactory. Such latices that voids remain in the plastic. are usually at a solids content of about If the porous plastic uses a somewhat flexible 50%, yet the amount of water in it is Material, the products of such processes are not critical 45 latex. Properties similar to those of natural sponges Typical useful aqueous latices are those of men are similar, and you can use the following polymers: polyethylene, polyvinyl acetate, be able to add considerable amounts of liquid- acrylate polymers, polystyrene, polyvinyl chloride-ace- to take. tat copolymers, styrene-acrylic copolymers, Bu- More recently, processes for producing 50 tyl rubber, styrene-butadiene copolymers, vinyl of porous plastic masses with simultaneous toluene-butadiene copolymers, butadiene-acrylonitrile Introducing a liquid into the pores of the products copolymers, polyvinylpyrrolidone ethyl acrylate, Vi- developed. nylpyiTolidon-styrene copolymers, polyvinylidene The object of the present invention is sheep chloride, polyvinylidene fluoride and polyamides, such as Creation of a new, simpler and more effective 55 nylon. method for the production of a porous plastic- The plasticizers used are well-known mass that binds a liquid plasticizer in the pores, which is usually added to plastics contains. will give to their flexibility or others According to the invention, this object is to improve properties. To the ones under consideration here solves that the aqueous latex of a thermoplastic 60 drawn plasticizers belong to primary plasticizers Polymers in the presence of a plasticizer, coagulants, secondary plasticizers and mixtures is lated and the coagulated latex after removal therefrom. Primary plasticizers are generally used of the water until the melting of the thermo- defined as a plasticizer that contributes to the plastic plastic polymer is heated. solvate elevated temperatures while sec- It is particularly advantageous that the plastic is used as a polymeric plasticizer, even at increased levels ethylene or polyvinyl chloride is used. Temperatures not in any significant In an advantageous embodiment used to measure solvate. Whether a primary or a second the plasticizer is a secondary plasticizer or a mixture of primary plasticizers