DE1629544A1 - Foamy synthetic resin products - Google Patents

Description

DR. EULE DR. BERG

PATENT LAWYERS 8 MUNICH 2. HILBLESTRASSE 2O

Dr. Owl dr Berg Dipl.-Ing. Stapf 8 Munich 2, Hilblestrgße 20

Your sign

Our mark

Vl / Gd 14 102

date

2 0.

Lawyer files ~ No. 14 102

MONSANTO CHEMICALS LIMIOlED, London

¹¹ Foamed synthetic resin products ""

The invention relates to products made of foamed Synthetic resins, in particular on a novel extruded The invention also includes a product made of foamed synthetic resin and a process for its production a new type of extruder nozzle,

BATH

009886/1778

(MlI) 5162081/82 Telsgramm-Adr .: PATENTEULE Manchen Bank: Bay.riich · Vtrtlnibanlc MOnchcn 453100 Pollichtcki MOnchtn «343

Foamed thermoplastic resins such as foamed Polyethylene is widely used because of its excellent insulating properties and high elasticity in industrial products, it has now become an extruded foamed resin developed, its physical property * making it particularly valuable »

The foamed synthetic resin product according to the invention is an extruded corrugated product made of foamed aliphatic thermoplastic resin, the corrugations of which are in draw alignment and at substantially equal intervals are almost the same size as each other "

In the preferred embodiment, the corrugations are at least twice the height and width of the thickness of the foamed resin * Layer from which the corrugations are composed «The product of foamed resin can be either flat or tubular be; that is, in the latter case the layer forms a pipe "

Examples of expanded resin products according to the invention are shown in Figures 1 and 2 of the drawings accompanying the description.

Fig. 1 shows the perspective view of a corrugated ply made of foamed resin and

Fig. Figure 2 is a perspective view of a corrugated tube

foamed resin « o.« "~

• ORIGINAL BATHROOM

009 886/17 78 - 3 -

The layer 1 of thickness (t) shown in FIG. 1 is, as shown, evenly corrugated, the corrugations running in the direction of the extrusion direction indicated by the arrow. The individual corrugations have a depth (d) and width (w) _o

The corrugated layer shown in FIG. 2 in the form of a tube has a mean radius (r) and a thickness (t) and is uniformly corrugated in accordance with the illustration, with the Corrugations in the direction of the drawing indicated by the arrow * direction run "The individual corrugations have the depth (d) and width (w)"

The inventive method is for the production of a corrugated product made of foamed aliphatic thermoplastic Resin determined, being a foamable aliphatic thermoplastic resin material is extruded through the slot of an extrusion port, at each other opposite sides alternately spaced beads are arranged, which the corrugations in the 3x » create a truded layer of foamed resin so that the resulting corrugations extend parallel to the direction of pulling * ken and, with almost the same size, have essentially the same spacing from one another »For the production of a Tube, the slot is of course ring-shaped »

The invention further comprises an extrusion nozzle for the Manufacture of a product from corrugated foamed material

00988671778 __

'BAD ORIGtiÄ ⁴ "

aliphatic thermoplastic resin, with an elongated slot or an annular mold opening, the jaws of which contain a number of equally spaced beads of the same shape alternately, whereby "during extrusion of a foamable thermoplastic " resin. through the shape of the beads introduce the corrugation of the foamed resin, the corrugations in Ex « run in the direction of trusion and, with almost the same size, have essentially the same distances from one another.

The aliphatic thermoplastic resin becomes ethylenic through polymerization (including copolymerization) unsaturated monomer produced. In many cases the monomer is preferably an ethylenically unsaturated hydrocarbon (or olefin), but it can also be a nitrile be, for example, acrylonitrile, a vinyl or vinylidene chloride, Vinyl acetate or an acrylate, such as ethyl acrylate or methyl methacrylate. If the monorere is a Is hydrocarbon, it can be, for example, ethylene, propylene or a butylene, for example it can be Polymer can be polyethylene (of high or low density) or polypropylene · In addition, a copolymer one of the hydrocarbon monomers (e.g. ethylene) with another monomer such as one of the above, The copolymer can, for example, be an ethylene-propylene or ethylene-vinyl acetate copolymer *

009886/1778 bad original

Often the resulting product is flexible, in particular if it consists of a polyolefin such as polyethylene _e. The degree of flexibility also depends to a certain extent on the thickness (t) of the product, which can be up to 13 mm or only 1/4 mm, for example. Preferably, however, the thickness ranges between 1.3 mm and in particular at about 2.5 mm _e 6.5 mm, the depth and width of the individual corrugations is preferably at least twice the thickness of the layer, and it is generally sufficient if the depth and width are each 2 to 1 times, preferably 3 to 5 times the thickness. Often the depth and width are almost the same, but this is not a fundamental condition; for example, the depth can be »2 to 3 times the width. The corrugations can extend partially, but preferably entirely over the width or around the circumference of the layer or the tube.

Preferably, the foamed resin has a predominantly closed cell structure (ie, the majority of the bubbles in the foam are closed); the vesicles can, for example, have a diameter between 0.025 and 1.3 mm. The average bubble size is preferably quite small, for example between 0.05 and 0.13 mm. The density of the foamed resin can be chosen over a wide range ; it can for example be between θ kg / or

BATH ORIGINAL

009888/1778

or even less and 480 kg / m or more.

Preferably "however, the density is in the lower part of this range, i.e. at densities from 16" to 80 kg / m, whereby e.g. densities 32 or 48 kg / m ^{5 are} often very suitable «

Some examples of nozzles according to the invention are shown in Figures 3 to 9 of the drawings.

Fig. 3 shows a front view of this first nozzle » Fig. 4 is a section on the line IV-IV in Fig. 30

FIG. 5 is a perspective view of part of the lower half of that shown in FIGS. 3 and 4. FIG Nozzle after removing the upper half »

Figure 6 is a perspective view of part of a second nozzle.

Figures 7 and 8 are views corresponding to Figure 6 of one third or fourth nozzle "

Fig. 9 is a schematic front view of an annular nozzle.

^B ^ ORIG

0 & 9886/1778

The nozzle shown in Figures 3 to 5 comprises two blocks and 2 made of mild steel, which are held together by screws 3. Each block has a shoulder 4 and 5 at both ends, so that the blocks, when they, as 3 and 4 shown, lie together, form a slot-shaped opening 6. The blocks "have means (not shown) for attachment to the front part of an extruder, so that a foamable resin material can be extruded through the slot as viewed by the arrows in FIGS Steel fastened by fastening screws 8 reaching through the plate into sewing holes in the block 1. A generally similar plate 9 is correspondingly fastened to the other block so that the two plates together form a pair of jaws 10 and 11. Both jaws have one Row of equally spaced grooves 12, each of which has a concave shape that forms part of a cylinder. The grooves are alternately opposite one another on the opposing jaws 1o and 11, so that each groove has a bead 13 between a pair of grooves on the opposite side Cheek facing "

The notches in the nozzle can run the full depth of the nozzle from the front to the back, if necessary can also run many different forms of

·. 8 β

0G9886 / 1778 bad

Grooves can be used, as the examples in Figo 6 and show, while in the nozzle shown in Pig · 8 the depth of the grooves increases in the extrusion direction «

The above examples all have an outlet * Open slots that are straight (if the grooves are neglected) get lost. However, this is not absolutely necessary. The slot can be curved, or of course also, as shown schematically in Fig. 9, ring-shaped, so that the missed product formed a corrugated tube

The mass of the nozzle can be chosen within a wide range depending on the desired masses of the finished product. The length of the mouth of the nozzle in the case of a slot or its diameter in the case of a circular shape can vary, for example, between 13 and 1500 mm or more. Often this dimension is between 25 and 60 mm. The height of the mouth of the mold (d.ß, the distance between the opposite boundaries both in a slot as well as a circular shape) is not larger than 5 -allgemeinen MMJ often is a height of o, 13 Mb 2 _t 5 mm, e.g. 0.25 to 1.3 mm all found suitable. Another dimension of the mouth of the nozzle is its depth in extrusion direction

this can be ζ * Β · between 2.5 mm and 50 mm · The Grooves in the jaws of the nozzles do not need to be very deep * Often the depth of the grooves is the height of the Orifice comparable It can be between 0.05 and 2.5 mm Preferably, the grooves are fairly close together, especially if the height of the Mouth of the nozzle, and. The distance between the means «. points of adjacent grooves is preferably no larger than 25 mm, for example between 1.3 and 15 mm * Around 5 mm is often a suitable distance *

The resin used for the process is of course foamable, that is, it contains admixtures of one a gas evolved Substana with a low boiling point or a substance evolving a gas by chemical means * In many cases this substance evaporates quickly , Si ^ ba ^ anz or a gas or steam at normal

Conditions (at 2ο C and a pressure of 1 kg / cm) »which is determined by the pressure before the extrusion in. Solution in the molten or semi-liquid thermoplastic resin is held. Furthermore, the substance evolving the gas can be liquid under normal conditions, such as * Penthan or one. Fraction of the same, examples of volatile materials that may find use include the lower aliphatic hydrocarbons such as methane,

- 10 -

009886/1778 -, bad oriojmäl

Ethane, ethylene, propane, butane, butylene, or a pentane, lower alkyl halides such as methyl chloride, trihlomethane or 1,2-dichloride met luoroethane; Acetone; and inorganic Gases such as carbon dioxide or nitrogen, the lower aliphatic hydrocarbons, in particular Butane are to be preferred »The developing substance can also evolve this gas by chemical means. a wrapping agent, e.g. a bicarbonate such as sodium bicarbonate or ammonium bicarbonate, or it can be an organic Be a nitrogen compound that emits nitrogen when heated, such as dinitrosopentamethylene diamine or barium azodicarboxylate. 3 to 3o #, in particular between 7 and 2o #, of the weight of the resin is mostly a suitable admixture ratio for the gaa-developing agent, for example one admixture from 10 to 15 percent by weight of butane to polyethylene excellent results «The gas-generating substance can be mixed with the resin in various ways: Particles of the resin can before being introduced into the Ex ~ truder be dusted with the substance, if it is a solid, or, if it is liquid, immersed in it. If the gas-evolving substance is a is a volatile substance and when using an extruder with a screw conveyor, the gas-evolving substance becomes preferably under pressure into the pressure housing of the extruder introduced.

009886/1778

The resin preferably also contains a condensation nucleus supplying substance that contributes to the formation of a large number of very fine bubbles. To this end you can very different substances are used, including finely divided inert solids such as silicate, clay, possibly in conjunction with zinc stearate, or small amounts of a substance that is at the drawing temperature decomposes with evolution of gas. An example of the latter type is sodium bicarbonate, possibly in conjunction with a weak acid such as formic acid or citric acid, in general it is sufficient to add a small one Amount of the substance supplying the condensation nuclei, for example up to 5 percent by weight »

The extrusion temperature (the temperature of the bad and the resin contained therein) depends Ms to a certain mass of the softening point and the rheologisehen properties of the resin off, "In general, however, temperatures between 9o ° C ^r and .Between 18o ° ß _f preferably 95 and 16 O ⁰ C suitable · When using foamable polyethylene, for example, a l'emiperatar ± m range of 95 Ms 11o ° ti is usually very .suitable »

2 i * är ä & s pull are bridges of more than 1? , 6 ifcg / ßai, and particularly suitable between 1?, 6 and 35o kg / cnt *

if ft

The pressure is preferably between 21 and 140 kg / cm

The extruded article is preferably up to Ab-Jriihlung supported in any way, examples, by a roller or a take-off device with conveyor belts or by passing over a flat plate, or between two plates through ₀

The foamed resin corrugated product is an excellent one lightweight and flexible packaging material. For example, a corrugated tube according to the invention forms one practical inner packaging for bottles, in general I mean, the foamed product can also be used for upholstery work or as a base for carpets. It is also a thermal insulator; in this capacity it can be used to insulate roofs, or A strip or tube can be wrapped around a water pipe or tank where it provides an insulating layer Make coat «

The corrugated product can be covered on one or both sides, for example with paper, fabric, metal foils (for example Aluminum) or a layer of thermoplastic resin such as polyolefin can be coated * If necessary, the one used as an upper pull Layer on its part be foamed "

- ■■. "■ / ■■■ ~~ '-—- # ·, 13 -

■. ■ '....;'...... --- "- ⁶ ^ D ORIGINAL

0Ö9886 / 1778

«13 -

To achieve improved insulating or elastic Properties can be two or more superimposed Layers of the corrugated product are used, and a "particularly favorable layer material of this type consists of individual layers in which the corrugations of the adjacent layers between each other at an angle between Form 7 o and 9o °, but preferably 9o °. One material composed of two layers with their directions of extrusion at right angles to each other is particularly useful. It leaves can be used, for example, for insulation, packaging or for upholstery work and is particularly valuable as Underlay for carpets, as it has only a very low tendency to "crawl" along the floor when in use » The individual layers can be made into * · be glued together or welded together at individual points. A particularly useful type of this Material is made by folding a single layer at an angle of 45 ° to the direction of extrusion, a series of such folds can be made so that the folded material forms a flattened spiral ^

The invention is now illustrated by the following example.

At a

Da · Btiapttl tetaohreibt tin «g # wel.lte Ktatt« a »t

BATH

t tti if ftf 7 »; '■' ■ -:

Polyethylene and its production according to an inventive Procedure"

Me. The nozzle used corresponded to that described above and shown in Figs. 3 to 5 of the accompanying drawings, wherein the mouth slot has a height of 0.508, a Width of 152.4 and a depth of 25.4 πιει had. the Plate 7 was 3.165 mm thick and the centers of the grooves 12 were 5.08 mm from one another » where the radius of the grooves is 6, .3.5-mm and the greatest depth the notches would be 7.62 mm

Granulated polyethylene produced by high-pressure polymerization was thoroughly mixed with 5 percent by weight of finely divided silicate as a condensation nuclei-supplying substance, and then fed to the screw extruder provided with a mold, which had a pressure chamber of 38.1 mm diameter, while at the same time a quantity of butane under pressure in the chamber was introduced, the 12 Ge *. Wichteprozenten the resulting foamable poly ·· · äthylenverbindung corresponded The mold temperature was 98 ⁰ C and the pressure directly on the Fora was 35 »2 kg / cm ν Since" extruded product was, after leaving the Dust; duroh Hindurohleiten between two flat blades that converge slightly in the Ixtrusi gas seal «

,. Af · »

The result was a corrugated strip of foamed polyethylene according to that described above and shown in Fig. 1 of the accompanying drawings. The thickness of the material from which the corrugations were formed was 2.032 mm, and the individual corrugations had a height and width of 6.25 mm. It had a density of 32 kg / m and contained substantially closed vesicles with an average diameter of o, _o 5 mm, it was flexible and elastic and useful as Ver · "packing, cushioning or heat-Isolationsmaterialo

- 16 "

/ 1778

Claims (1)

Claims t ■ 1 * j Product made from foamed resin, characterized by an extruded and corrugated sheet of foamed aliphatic thermoplastic resin with Corrugations running parallel to the direction of drawing of approximately the same size and essentially the same distances from one another. 2β Product according to claim 1, characterized in that the depth and width of each corrugation is at least twice the thickness of the sheet material, in which the corrugations are shaped » 3 Product according to Claims 1 or 2, characterized in that that it is a flat sheet material. 4 · Product made of foamed resin, essentially as in Described above with reference to Figures 1 and 2 of the drawings accompanying the description, 5, product according to one of the preceding claims, characterized in that it is flexible. 6 »Product according to one of the preceding claims, characterized characterized that the resin is a polyolefin 009886/1778 ^Bad OR _{! GlNß} ' - 17 - 7 »Product according to spoke 6, characterized in that the resin is polyethylene. 8 «Product according to one of the preceding claims, characterized by ·· that its thickness is 1.3 to 6.4 mm is ₀ 9ο Product according to one of the preceding claims, thereby marked that the depth and breadth of each Corrugations are three to five times the thickness of the product » 1o «Product according to one of the preceding claims, characterized marked that the depth and the width of the individual corrugations are the same. 11. Product according to one of claims 1, 2 and 4 to 1o, characterized in that it is a flat surface or a tube in which the corrugations over the entire width or over the entire circumference extend. 12. Product according to one of the preceding claims, characterized in that the foamed resin consists predominantly of closed bubbles , the bubbles having a diameter of 0.05 to 0.13 nm * 009886/1778 BATHROOM QRIGIMAL 13 «Product according to one of the preceding claims, characterized in that the density of the foam • z is between 16 and 80 kg / m. Foamed resin product, essentially like described in the example 15 · Method of making a corrugated product from foamed aliphatic thermoplastic resin according to claim 1, characterized in that a foamable aliphatic thermoplastic resin mixture is extruded through the slot opening of a nozzle, the nozzle being a series more uniform in its jaws Has grooves that alternate at regular intervals on the opposite jaws are arranged and thus cause the corrugations of the extruded foamed resin sheet, whereby the resulting corrugations are parallel to the extrusion direction and approximately of the same size at substantially the same distances from each other are" 16 · The method according to claim 15 »characterized in that that through the same a product according to claim 2 is produced « - 19 - 009886/1778 17 «Method according to one of claims 15 or 16," thereby that is characterized by using a straight line Slot a product according to claim 3 is produced. 18 «Method according to one of claims 15" to 17, characterized characterized in that a product according to one of claims 4 to 13 is produced with it « 19o method according to any one of claims 15 "to 18, characterized characterized in that the opening slot of the nozzle is a Width between 25 and 600 mm «, 20 ". Method according to one of Claims 15 "to 19, characterized characterized in that the opening slot of the form a Height between 0.13 and 2.5 mm » 21 «, method according to one of claims 15" to 2o, characterized marked that the grooves in the jaws of the! nozzle Have depths between 0.05 and 2.5 mm «, Method according to one of claims 15 to 21, characterized characterized in that the distances between the centers of adjacent grooves in the jaws of the Nozzle between 1.3 and 13 mm. 009886/1778 ~ _20 ~ —-W - ^ BAD OHJQiNAL 25 · The method according to any one of claims 15 "to 22, characterized characterized in that it is essentially like a nozzle in the preceding "be schriet en and in Pig. 3 and 4 used in the drawings given in la. 24o method according to any one of claims 15 to 22, characterized characterized in that it has a shape substantially as described above and in Figs. 5 to 9 of the attached drawings shown used » 25 © The method according to any one of claims 15 to 24, characterized in that the foamable resin contains a volatile gas-evolving substance. 26. The method according to claim 25 »characterized in that the gas-evolving substance contains butane» 27. The method according to any one of claims 25 or 26, characterized characterized in that the extruder works by means of a screw conveyor and the gas-evolving substance is introduced under pressure into the pressure chamber of the extruder. 28, the method according to any one of claims 15 to 27, characterized characterized in that the foamable resin is a substance for the delivery of cores contains. 009886/1778 WorkW " ²¹ " 29 · Procedure according to. Claim 28, characterized in that that the substance for the delivery of cores contains silicate 3o # Method according to one of claims 15 to 29, characterized characterized in that the extrusion temperature is between 95 and 16o ° C is » 31 * Process according to claims 15 to 3o, characterized in that that the pressure during extrusion is between 17.6 and 35o kg / cm is 32 »Method according to one of claims 15 to 31» thereby characterized in that the extruded product is supported until it cools o 33 "Process for the production of a corrugated surface" formed from foamed resin, essentially as described in the example. . ■ 34. Product made of foamed resin, characterized in that it is produced by a method according to one of the claims
15 to 33 is made. 35 Extrusion nozzle for the production of a corrugated tube Certificate made of foamed aliphatic, thermoplastic 0G9886 / 1778 ~ 22 - ' Shem resin, characterized by an elongated slot opening or an annular opening with a series of uniform grooves along the jaws that are in the same shape Intervals are arranged alternately on the jaws, so that when extruding a foamable thermoplastic synthetic resin through the nozzle the grooves a ^ osition of the extruded product made of foamed Produce resin, the corrugations running parallel to the direction of drawing and approximately the same size and essentially the same distances between each other "have" 36 «extras ion nozzle according to claim 35» characterized in that that it has a straight * opening 37 · Extrusion nozzle according to one of claims 35 and 36, characterized by any of claims 19 up to 22 properties laid down » 38 * Extrusion nozzle essentially as in the previous one described with reference to the position in Pig · 3 and 4 of the drawings accompanying the description » 39, extrusion nozzle essentially as in the previous one with reference to the illustration in Pig »5-9 described in the drawings enclosed with the cover « BAD ORJGINAL - 23 - 009886/1778 ~ 23 - 4oo method of packaging, characterized by the use of a product made of foamed resin according to Claims 1 to 14 and 34 as shock-absorbing material «» 41 © Isolation process, characterized by the use a product made of foamed resin according to An · * Proverbs 1 to 14 and 34 as insulating material «, 42β method for upholstery characterized by the use of a foamed resin product according to a of claims 1 to 14 and 34 as padding material, 43ο Procedure for laying carpets, marked through the use of a product made of foamed resin according to claims 1 to 14 and 34 as a base * 44e layer material, characterized by a product The foamed resin according to any one of claims 1 to 14 and 34, which is laminated into a sheet material became, 45 · Layer material according to claim 44, characterized in that that the product made of foamed resin is bonded to a layer or sheet of thermoplastic resin is. 00988671778 46, layer material according to claim 441, characterized in that that it consists of two or more superimposed Layers of a product made of shameful resin according to claims 1 Ms 14 and 34 is composed » 47β layer material according to claim 46, characterized in that that the extrusion directions are "adjacent to each other" Layers at an angle to each other » 48 »Layer material according to claim 47, characterized in that that the angle is 9o °. 49β layer material according to claim 48, characterized in that that it is made by folding a foamed resin product according to claims 1 to 14 and 34 along a Line is made at an angle of 45 to the direction of drawing. 50 «Process according to Claims 4o to 43» through the use of layer material according to claims 44 to 49 009886/1778