Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
  • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D22/00—Producing hollow articles
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
  • C08L25/06—Polystyrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/16—Homopolymers or copolymers of alkyl-substituted styrenes

Definitions

• the present invention relates to a glass-like material which has improved safety characteristics compared to ordinary glass .
• references to a "glass-like" material refer to a material having the following characteristics; clarity, brittleness, low strain to failure and rigidity.
• Ordinary glass is used in a variety of everyday applications. For example it is known in the art to use glass as a protective covering over fire and other types of emergency alarms, emergency door releases, emergency stop buttons on public transport, fire extinguishers, fire axes and the like. As glass is transparent persons can quickly and easily identify the presence of the alarm or apparatus in the retaining box. If required, the glass can be broken in order to access the alarm or device.
• the glass may also be broken by malicious or accidental damage. Whilst the glass fragments can be removed and the retaining glass replaced, there is an interim risk of injury to persons coming into contact with the broken fragments.
• Safety glass i.e. toughened glass
• materials are well known in the art and have numerous applications and uses. Most have enhanced safety by virtue of being reinforced in strength, such that they have a higher stress to failure than glass; in other words a greater force is needed to shatter or break them than would be required with ordinary glass .
• Uses vary from windows and doors on automobiles and public transport, to domestic uses such as shower enclosures and room partitions. Whilst in many instances these have greatly increased safety, they are of limited use in Applications where it is actually desirable for the glass to be broken, i.e. when used on retaining boxes of emergency apparatus and alarms, because of their enhanced strength and resistance to force.
• the polymeric materials PerspexTM and PlexiglasTM are transparent like glass, and do not pose the same risk of injury when broken. However, these materials can be harder to break than glass and can still produce sharp fragments when broken.
• Glass bottles are also disliked as they can be used deliberately, as weapons, to inflict damage on other persons.
• safety regulators have actively encouraged drinks manufacturers, as well as establishments which serve drinks and alcohol, to use bottles and glasses made from non-dangerous materials, in order to reduce the number of serious injuries caused by glass and bottle attacks .
• bottles manufactured from materials which are not as dangerous as glass It is estimated that packaged beer production world wide in 1996 was 106.6 billion litres, requiring 186.2 billion bottles and 73.7 billion cans. The beer bottle marker was forecasted to grow at an annual rate of three percent through 2001 to 216 billion units. Most bottle production makes use of glass with only 0.1 billion plastic bottles being utilised in 1996. However due to the push towards increased safety it is estimated that the demand for plastic bottles is forecast to reach 2.5 billion by 2006.
• PET poly (ethylene terephthalate)
• PET poly (ethylene terephthalate)
• PET is a relatively expensive material and not cheap to processwhich makes it a less popular option for drinks manufacturers.
• plastic bottles are not as well received by the public as they feel cheaper and do not have the same high quality feel as glass.
• a material which shatters, when broken, into fragments which do not cut, puncture or otherwise damage human skin or tissue wherein the material is comprised of an amorphous thermoplastic polymer and one or more low molecular weight resins.
• the material is comprised of a simple mixture of amorphous thermoplastic polymer and one or more low molecular weight resins.
• the amorphous thermoplastic polymer is chosen from the group consisting of polystyrene (PS) , polymethyl methacrylate (PMAA) , styrene-acrylonitrile copolymer (SAN) , linear polyesters and co-polyesters and polycarbonate (PC) .
• PS polystyrene
• PMAA polymethyl methacrylate
• SAN styrene-acrylonitrile copolymer
• PC polycarbonate
• the one or more low molecular weight resins chosen will be completely compatible with the chosen polymer.
• the low molecular weight resin is typically C9 aromatic hydrocarbon resin.
• the material has a tensile stress limit of between 11 and 60 Nmm "2 .
• the low molecular weight resin will have a Mn (number average molecular weight) such that it has less than 500 repeating units, and preferably less than 50 repeating units.
• the material may be manufactured in sheet form.
• a polymeric blend comprising a polymer selected from the group consisting of: polystyrene, (PS), polymethyl methacrylate (PMAA) , styrene-acrylonitrile copolymer (SAN) , linear polyesters and co-polyesters and polycarbonate (PC) and one or more low molecular weight resins.
• PS polystyrene,
• PMAA polymethyl methacrylate
• SAN styrene-acrylonitrile copolymer
• PC polycarbonate
• the one or more low molecular weight resins chosen will be completely compatible with the chosen polymer.
• the low molecular weight resin is typically C9 aromatic hydrocarbon resin.
• the one or more low molecular weight resins have a Mn (number average molecular weight) such that it has less than 500 repeating units, and preferably less than 50 repeating units.
• the one or more low molecular weight resins are hydrocarbon resins .
• the one or more low molecular weight resins are aromatic hydrocarbon resins.
• the polymeric blend may be manufactured in sheet form.
• a material which shatters, when broken, into fragments which do not cut, puncture or damage human skin or tissue being comprised of polystyrene and one or more low molecular weight resins.
• the material is comprised of a simple mixture of polystyrene and one or more low molecular weight resins.
• the one or more low molecular weight resins are hydrocarbon resins .
• the one or more low molecular weight resins are aromatic hydrocarbon resins.
• the one or more low molecular weight hydrocarbon resins are C9 aromatic hydrocarbon resins.
• the one or more low molecular weight resins are, or are derived from, alpha methyl styrene.
• the one or more low molecular weight hydrocarbon resins are selected from a group consisting of; NorsoleneTM, KristalexTM, PlastolynTM EndexTM, PiccotexTM, PiccolasticTM, SukorezTM or ArkonTM.
• the one or more low molecular weight hydrocarbon resins are selected from a group consisting of; Norsolene W90TM, Norsolene W100TM, Norsolene WHOTM, Kristalex F85 TM, Kristalex F100 TM, Kristalex F115 TM, Plastolyn 240 TM, Plastolyn 290 TM, Endex 155 TM, Piccolastic D125 TM, Sukorez 100 TM, Sukorez 120 TM, Arkon P100 TM, Arkon P125 TM, Arkon P140 TM, Piccotex 75 TM, Piccotex 100 TM or Piccotex 120 TM.
• the one or more low molecular weight resins will have a Mn (number average molecular weight) such that it has less than 500 repeating units, and preferably less than 50 repeating units.
• the material has a tensile stress limit between 11 and 60 Nm ⁇ f 2 .
• the material may also include UV inhibitors, antioxidants, flow modifiers, fire retarding agents, colour pigments and brighteners as known in the art.
• the material may be manufactured in sheet form.
• a method of manufacturing a material which shatters, when broken, into fragments which do not cut, puncture or damage human skin or tissue comprising the step of mixing an amorphous thermoplastic polymer and one or more low molecular weight resins.
• the amorphous thermoplastic polymer is chosen from the group consisting of polystyrene (PS) , polymethyl methacrylate (PMAA) , styrene-acrylonitrile copolymer (SAN) , linear polyesters and co-polyesters and polycarbonate (PC) .
• PS polystyrene
• PMAA polymethyl methacrylate
• SAN styrene-acrylonitrile copolymer
• PC polycarbonate
• the one or more low molecular weight resins are completely compatible with the chosen polymer.
• the chosen low molecular weight resin is C9 aromatic hydrocarbon resin.
• the one or more low molecular weight resins are hydrocarbon resins .
• the one or more low molecular weight resins are aromatic hydrocarbon resins.
• the low molecular weight resin will have a Mn (number average molecular weight) such that it has less than 500 repeating units, and preferably less than 50 repeating units.
• the glass transition temperature (T g ) of the material is elevated.
• Tg is elevated to 5-10 degress C higher than the base polymer.
• a method of manufacturing a material which shatters, when broken, into fragments which do not cut, puncture or damage human skin or tissue comprising the step of mixing polystyrene and one or more low molecular weight hydrocarbon resins.
• the one or more low molecular weight resins are hydrocarbon resins.
• the one or more low molecular weight resins are aromatic hydrocarbon resins.
• the one or more low molecular weight hydrocarbon resins are C9 aromatic hydrocarbon resins.
• the one or more low molecular weight resins are, or are derived from, alpha methyl styrene.
• the one or more low molecular weight hydrocarbon resins are selected from a group consisting of; NorsoleneTM, KristalexTM, PlastolynTM EndexTM, PiccotexTM, PiccolasticTM, SukorezTM or ArkonTM.
• the one or more low molecular weight hydrocarbon resins are selected from a group consisting of; Norsolene W90TM, Norsolene W100TM, Norsolene WHOTM, Kristalex F85 TM, Kristalex F100 TM, Kristalex F115 TM, Plastolyn 240 TM, Plastolyn 290 TM, Endex 155 TM, Piccolastic D125 TM, Sukorez 100 TM, Sukorez 120 TM, Arkon P100 TM, Arkon P125 TM, Arkon P140 TM, Piccotex 75 TM, Piccotex 100 TM or Piccotex 120 TM.
• the method may comprise the optional step of adding an additive selected from the group consisting of UV inhibitors, antioxidants, flow modifiers, fire retarding agents, colour pigments and brighteners as known in the art .
• the glass transition temperature (T g ) of the material is elevated.
• Tg is elevated to 5-10 degress C higher than the base polymer.
• a container manufactured from a material that shatters when broken into fragments which do not cut, puncture or otherwise damage human skin or tissue.
• the container may be a bottle, glass, tumbler, or the like.
• the material is comprised of an amorphous thermoplastic polymer and one or more low molecular weight resins.
• the amorphous thermoplastic polymer is chosen from the group consisting of: polystyrene (PS), styrene- acrylonitrile co-polymer (SAN) , linear polyesters and co- polyesters polycarbonate (PC) .
• PS polystyrene
• SAN styrene- acrylonitrile co-polymer
• PC co- polyesters polycarbonate
• the one or more low molecular weight resins are hydrocarbon resins.
• the one or more low molecular weight resins are aromatic hydrocarbon resins
• the one or more low molecular weight resins chosen will be completely compatible with the chosen polymer.
• the low molecular weight resin will typically be C9 aromatic hydrocarbon resin.
• the material has a tensile stress limit between 11 and 60 Nm ⁇ f 2 .
• the one or more low molecular weight hydrocarbon resins are selected from a group consisting of: NorsoleneTM, KrystalexTM, PlastolynTM, EndexTM, PiccotexTM, PiccolasticTM, SukorezTM, ArkonTM Most preferably the one or more low molecular weight hydrocarbon resins are selected from a group consisting of; Norsolene W90TM, Norsolene W100TM, Norsolene WHOTM, Kristalex F85 TM, Kristalex F100 TM, Kristalex F115 TM, Plastolyn 240 TM, Plastolyn 290 TM, Endex 155 TM, Piccolastic D125 TM, Sukorez 100 TM, Sukorez 120 TM, Arkon P100 TM, Arkon P125 TM, Arkon P140 TM, Piccotex 75 TM, Piccotex 100 TM or Piccotex 120 TM.
• the low molecular weight resin will have a M n (number average molecular weight) such that it has less than 500 repeating units, and preferably less than 50 repeating units.
• the container may be manufactured from the material using injection blow moulding and/or injection stretch blow moulding techniques.
• the container may be manufactured from the material using extrusion blow moulding.
• the material of the container may also comprise a oxygen barrier.
• the material of the container may also comprise oxygen scavengers.
• the barrier included in the material of the container may be selected from the group consisting of: acrylonitrile- methyl acrylate copolymer, ethylene vinyl alcohol (EVOH) or nylon MXD6.
• the barrier is Barex TM. Most preferably the barrier is BarexTM 210 or BarexTM 218.
• the oxygen scavenger may be X-312. Amosorb 3000, or a scavenger of MXD6 with metal catalysed oxygen reduction chemistry may also be used.
• the barrier may be overmoulded or sprayed onto the container or alternatively may be included in the material of the container, using co-injection techniques.
• the container may also have an inorganic coating. This may be a thin layer of amorphous carbon.
• the inorganic coating may be applied to the inside surface of the container. Typically the inorganic coating will be applied in a layer of 100 to 200nm thickness. The layer may be applied by spraying.
• the container may also have an external organic coating.
• the external organic coating may be PVDC or a two component epoxyamine.
• the container may be manufactured from multiple layers of the material . Two or more layers of the container may be combined to act as an improved oxygen barrier.
• the material of the container may also include UV inhibitors, antioxidants, flow modifiers, colour pigments and brighteners as known in the art .
• the glass transition temperature is elevated.
• the material of the container has a glass transition temperature of above 80°C.
• the material herein described can be used as a substitute for ordinary glass.
• the material is glass-like in character having clarity, brittleness, low strain to failure and rigidity.
• the material has a variety of uses including application as enclosures and boxes to house emergency equipment e.g. keys, first aid boxes, fire extinguisher, window hammers, emergency stop buttons, emergency kick out panels and alarms, as well as use in access panels, windows and doors. It should be recognised that the abovedescribed uses are by way of example only and are not intended to limit the manner in which the material is used.
• the material can be manufactured in sheet form, by extrusion, and moulded into any shape by injection moulding or other standard melt processes.
• Table 1 shows the stress-strain behaviour of the material in comparison to other polystyrene materials.
• Figure 1 shows this information in the form of a graph.
• SafeglassTM materials are slighly more rigid and certainly more brittle than conventional "crystal"polystyrene. Modified polystyrenes are invariably less rigid and tougher materials as a result of blending with a rubbery (low T g ) additive. This also results in a lowering of the Glass Transition Temperature (T g ) as witnessed by the reduction in the Vicat Softening Temperature. The reverse is true of SafeglassTM materials which show no such decrease in T g , indeed it can be higher than the critical temperature.
• the material is fundamentally a blend of a rigid and normally brittle amorphous thermoplastic with a glass transition temperature Tg at least 5° C above ambient and one or more compatible low molecular weight resins.
• a rigid and normally brittle amorphous thermoplastic polymer is blended with one or more low molecular weight resins which have a Mn (number average molecular weight) such that the resin has less than 500 repeating units, preferably less than 50 repeating units.
• the one or more low molecular weight resins have a weight average molecular weight of 6050 or below.
• the material is manufactured by mixing or blending a clear polymer with one or more low molecular weight hydrocarbon resins.
• the polymer is an amorphous thermoplastic and can be chosen from the group of polystyrene, (PS) , polymethyl methacrylate (PMAA) , styrene-acrylonitrile copolymer (SAN) , linear polyesters and co-polyesters and polycarbonate (PC) .
• PS polystyrene
• PMAA polymethyl methacrylate
• SAN styrene-acrylonitrile copolymer
• PC polycarbonate
• polystyrene it is C9 aromatic hydrocarbon resin.
• polystyrene is used.
• the one or more low molecular weight resins which are mixed with the polystyrene are aromatic hydrocarbon resins and typically C9 aromatic hydrocarbon resins.
• the one or more resins are typically alpha methyl styrene or vinyl toluene or derivatives thereof.
• the material when provided as a substitute to glass, for example in retaining boxes for emergency devices and alarms, can easily be broken by a human hand, fist, elbow, foot or the like and advantageously shatters into fragments or pieces which are not sharp and are not capable of cutting or puncturing human skin. Due to the inherent advantages of the material it is envisaged that it may have a variety of other uses, for example it may have application in novelty toys, such as stress relief toys, or have uses in "stunt" apparatus in, for example, theatres, shows or on film sets.
• the material is manufactured by conventional melt compounding techniques.
• the glass transition temperature (T g ) of the material is elevated as the low molecular weight resin does not have a plasticising effect, the opposite effect is seen as the glass transition temperature of the material is elevated.
• the material is generally transparent or clear, however dyes may be added to change the appearance of the material.
• Low molecular weight in resins is a function of the length of the chains in the resin.
• the hydrocarbon resins have a very low molecular weight, too low in fact for the resins to be of any use on their own, and are difficult to mould.
• the stress limit of the polystyrene is reduced giving the material the characteristics described in the present Application.
• the low molecular weight resin will have a Mn (number average molecular weight) such that it has less than 500 repeating units, and preferably less than 50 repeating units.
• Example 1 In order to achieve a material with a stress limit of 24 Mpa, a 50% mix of polymer and 50% resin is used, which acheieves this stress limit.
• the polymer could be crystal polystyrene such as PolystyrolTM 143E, and resin PlastolynTM 240.
• Example 2 In order to achieve a material with a stress limit of 34 Mpa, a 60% mix of polymer and 40% resin is used, which acheieves this stress limit.
• the polymer could be crystal polystyrene such as PolystyrolTM 143E, and resin PlastolynTM 240.
• a container having improved safety characteristics can be manufactured from the material comprised of an amorphous thermoplastic polymer and one or more resins.
• the resins are aromatic hydrocarbon resins and are selected from a group consisting of Norsolene TM, Krystalex TM, Plastolyn TM, Endex TM, Sokorez TM, Arkon TM' PiccolasticTM and PiccotexTM, and in particular Norsolene W90TM, Norsolene W100TM, Norsolene WHOTM, Kristalex F85 TM, Kristalex F100 TM, Kristalex F115 TM, Plastolyn 240 TM, Plastolyn 290 TM, Endex 155 TM, Piccolastic D125 TM, Sukorez 100 TM, Sukorez 120 TM, Arkon P100 TM, Arkon P125 TM, Arkon P140 TM, Piccotex 75 TM, Piccotex 100 TM or Piccotex 120 TM.
• the one or more low molecular weight resins are C9 hydrocarbon resins with an M n (number average molecular weight) such that it has less than 500 repeating units and preferably less than 50 repeating units.
• M n number average molecular weight
• the resin or resins chosen will be selected on compatibility with the chosen polymer.
• Low molecular weight in resins is a function of the length of the chains in the resin.
• the hydrocarbon resins have a very low molecular weight, too low in fact for the resins to be of any use as a structural plastics material on their own, and are difficult to mould.
• the stress limit of the polystyrene is reduced giving the material the characteristics described in the present Application.
• the amorphous thermoplastic polymer is chosen from the group consisting of polystyrene (PS, styrene- acrylonitrile co-polymer (SAN) , linear polyesters and co- polyesters and polycarbonate (PC) . These can be mixed, blended or polymerised with the one or more low molecular weight resins. UV inhibitors, dyes, antioxidants, flow modifiers, colour pigments and brighteners can also be added to change or adapt the appearance of the container.
• PS polystyrene
• SAN styrene- acrylonitrile co-polymer
• PC polycarbonate
• the container herein described has many characteristics similar to an ordinary glass bottle - i.e. clarity, rigidity and brittleness. However when broken, the bottle shatters into fragments which are harmless and cannot be used to cut or pierce human skin.
• the material used to manufacture the container is fundamentally a blend of a rigid and normally brittle amorphous thermoplastic with a glass transition temperature Tg at least 50° C above ambient and one or more compatible low molecular weight resins .
• a rigid and normally brittle amorphous thermoplastic polymer is blended with one or more low molecular weight resins which have a M n (number average molecular weight) such that the resin has less than 500 repeating units, preferably less than 50 repeating units.
• the one or more low molecular weight resins have a weight average molecular weight of 6050 or below.
• the material is, by design, manufactured to break between 11 and 60 Nmm "2 .
• the material can be heated and made into the desired shape of the container, i.e. a bottle, glass or tumbler, by any suitable technique known to the art e.g. injection moulding, extrusion blow moulding or pre-form injection blow moulding techniques .
• the container may be manufactured from one or more layers of the material . More than one layer may be used to provide improved oxygen barrier characteristics. Alternatively the container may be coated with an oxygen barrier.
• Conventional coating technologies can be broadly divided into two categories. The first are those that use vacuum or plasma routes to deposit very thin films of materials, such as carbon or silica, onto the surface of the article being coated. The second, rely on the atomised spraying of liquid organic materials onto the external surfaces of the bottle. Ideally all coating materials must not interfere with the economics of recycling, nor detract from the bottle's appearance, but a significant further consideration with thin film internal deposits is the need for the materials to be approved for food contact .
• the container described herein is manufactured from the material at lower processing materials than conventional plastics, barriers which are not usually suitable for this purpose can be used.
• the container can be coated in BarexTM (acrylonitrile-methyl acrylate copolymer) , and in particular BarexTM 210 or BarexTM 218, which has high oxygen barrier properties. This can be achieved either by overmoulding, spraying or co-injection techniques.
• the barrier could alternatively be acrylonitrile-methyl acrylate copolymer, ethylene vinyl alcohol (EVOH) or nylon MXD6.
• the barrier could be provided on the inside or outside of the container.
• Oxygen scavengers such as all polyester Amosorb 3000 or X-312 scavenger may be used.
• Oxygen scavenging materials can be incorporated into the material of the container to react with the gas before it reaches the contents.
• Amosorb 3000 or X-312 scavenger have particular application when the barrier selected is MXD6 nylon. With these types of active oxygen scavenging packages, shelf life performance is determined solely by the rate of carbonation loss and C0 2 loss is reduced by the presence of the MXD6 as a physical barrier.
• a scavenger of MXD6 with metal catalysed oxygen reduction chemistry may also be used (Oxbar) . This system reacts very quickly with oxygen in the container and has a high oxygen capacity, ensuring a long active life.
• the container may also have an inorganic coating such as amorphous carbon. This can be sprayed onto the surface of the container being coated.
• the inorganic coating can be applied either to the inside or outside of the bottle after blowing. Plasma-applied coatings, using carbon or silicon, which have recently been developed, may be used.
• the Sidel ActisTM and Kirin DLCTM coating technologies can be used produce a thin layer of amorphous carbon, typically 100 to 200nm thick, on the inside surface of the container. This is deposited from a high-energy plasma of acetylene gas within a high vacuum environment .
• the coating provides an excellent barrier to both 0 2 and C0 2 , and, because it is on the inside of the container, prevents the 0 2 dissolved in the material of the container from migrating into the contents of the container during the first few weeks of storage.
• the deposited layers are fundamentally brittle, they have to be extremely thin in order not to flake off under container stresses, caused by bottle expansion and creep when the bottle is filled, and under pressure from the contents. Other factors include damage and scuffing due to bottle handling, but these clearly do not affect the integrity of the coating if it is on the inside.
• the barrier performance improvements of carbon coatings are similar to those achieved by organic coatings, again giving a longer potential retail shelf life of around nine months .
• Silica technologies such as Glaskin and BestPet can also be used. These rely on the application of a SiO x vacuum plasma coating, to give a barrier layer between 40 and 60nm thick. While the Glaskin process applies the glass clear coating to the inside of the bottle, the BestPet technique applies it to the outside.
• an organic coating may be used.
• External organic coatings have been known and used in the industry since the early 1980s.
• barrier coating solutions based on two component epoxyamine chemistry (Bairocade) were developed, first to lengthen the shelf life of the smaller soft drink sizes in hotter climates, and then for beer. These provide a transparent, glossy, external spray coating which is an excellent barrier to migration of C0 2 and 0 2 , and is unaffected by humidity.
• the low temperature thermoset cure provides a tough film, robust to filling and handling conditions.
• the coating will be applied to the container at thicknesses between 6 ⁇ m and lO ⁇ m, and allow the use of standard resins and preforms with existing injection and blow moulding equipment.
• the use of such coatings provides a performance improvement which is around 19 times better than an uncoated container and translates into a longer retail shelf life.
• the external organic coating may be PVDC two component epoxyamine.
• the alternative approach to improving the gas permeation properties of the container material is to manufacture it from multiple layers of the material.
• two or more layers of the container may be combined to act as an improved oxygen barrier.
• Final shape blowing produces a bottle with up to seven different polymer layers, which either act as a physical barrier to gas permeation, or are chemically active in scavenging oxygen from the material of the container and intercepting oxygen diffusing in from outside.
• the material herein described has an elevated glass transition temperature, which is much higher than the glass transition temperature of, for example, PET.
• PET has a glass transition temperature that is lower than the pasteurisation temperature used in the beer industry.
• creep may occur during filling. In other words the material expands, which causes deformity of the bottle.
• This problem is eliminated using the material herein described as the glass transition temperature is above the pasteurisation temperature used during filling.
• bottles made from PET are generally filled using flash pasteurisation, as opposed to full pasteurisation, which the industry prefers.
• Full pasteurisation is generally more efficient which results in a longer shelf life for the product.
• full pasteurisation is not generally used with PET materials.
• a particular advantage of the material herein described is that because it has an elevated glass transition temperature, it can withstand full pasteurisation.
• a particular advantage of the container described herein lies in the fact that even though it does not shatter into dangerous fragment when broken, it has a similar quality feel as glass, and has improved aesthetic qualities over existing plastics such as PET.
• the material herein described for use in manufacturing a container is relatively light and glass-like to touch and as it is a polymer is can be processed, for example by including oxygen barriers during production. Importantly, the material is thicker than an equivalent PET bottle so has a more glass-like feel but can be manufactured into containers without an increase in cost .
• the container may be used for beer, carbonated soft drinks, oxygen sensitive juices, beverages or milk.
• the 15% resin maybe comprised of a single resin selected from the group consisting of Norsolene TM, Krystalex TM, Plastolyn TM, Endex TM, Sokorez TM, Arkon TM' PiccolasticTM and PiccotexTM, or may be a combination of two or more of the above. PlastolynTM is particularly suitable for this purpose.
• the resin or resins are selected to achieve a desired molecular weight range .

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• Chemical & Material Sciences (AREA)
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• Engineering & Computer Science (AREA)
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• 2004
  • 2004-08-31 EP EP04768203A patent/EP1664190B1/en not_active Expired - Lifetime
  • 2004-08-31 US US10/571,603 patent/US20060293436A1/en not_active Abandoned
  • 2004-08-31 GB GB0512993A patent/GB2411898B/en not_active Expired - Fee Related
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