GB2360974A - Latex rubber products - Google Patents

Latex rubber products Download PDF

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Publication number
GB2360974A
GB2360974A GB0108658A GB0108658A GB2360974A GB 2360974 A GB2360974 A GB 2360974A GB 0108658 A GB0108658 A GB 0108658A GB 0108658 A GB0108658 A GB 0108658A GB 2360974 A GB2360974 A GB 2360974A
Authority
GB
United Kingdom
Prior art keywords
polyurethane
rubber
latex
product
seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0108658A
Other versions
GB0108658D0 (en
Inventor
Stanley Alan Spouse
Graham Alan Spouse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPECIALISED LATEX SERVICES Ltd
Original Assignee
SPECIALISED LATEX SERVICES Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SPECIALISED LATEX SERVICES Ltd filed Critical SPECIALISED LATEX SERVICES Ltd
Publication of GB0108658D0 publication Critical patent/GB0108658D0/en
Publication of GB2360974A publication Critical patent/GB2360974A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/14—Dipping a core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5042—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/62—Stitching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B29C66/612—Making circumferential joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/482—Drying adhesives, e.g. solvent based adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7316—Surface properties
    • B29C66/73161—Roughness or rugosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0058—Liquid or visquous
    • B29K2105/0064—Latex, emulsion or dispersion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
    • B29L2031/5254—Swimming or diving equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

A cuff- (or collar) seal 4 for a dry diving suit of polyurethane-coated fabric, is manufactured by dipping a former 1 into a bath 2 of rubber latex containing polyurethane and a di-iso-octyl phthalate plasticiser. Following drying and stripping from the former 1, the cuff 4 is attached to a sleeve 5 of the suit in an overlapping joint, firstly by stitching 8 throughout the overlapping region 7 and then by bonding them together with polyurethane tape 9 wound over the join 6. Hot air to melt thermoplastic adhesive on the tape 9, is directed between the tape 9 and the join 6 as the tape 9 is wound over the join 6 and compressed onto it within the nip between rollers.

Description

2360974 1 Latex Rubber Products This invention relates to methods of
manufacture of latex rubber products.
A common method for the manufacture of latex rubber products is by dip moulding. Conventionally this involves use of a former which has been prepared either by heating or by coating with a chemical coagulant, and which is dipped into a bath of an appropriately-prepared liquid compound of natural or synthetic rubber latex so as to build up a rubber coating on the former. Once the rubber coating has built up to the required thickness, the former is removed from the bath and the coating is dried before it is stripped from the former to provide the rubber article of desired form.
In many cases the product of the dipping process is required to be bonded to another article. However, the high molecular weight of rubber latex materials and residues of stabilisers in those materials, can cause some difficulty in achieving the adhesion required. This problem arises, for example, in the manufacture of dry (waterproof) diving suits of polyurethane-coated textile material, where watertight seals for the wrists, ankles and neck are provided by dipped-rubber cuff and collar components. These components are each bonded to the suit, often using a tape to cover the join between them so as to seal the joint and complete the attachment.
Bonding of the latex rubber component to the suit and of the tape to the latex rubber component, however, is not readily achieved according to known methods other than by the use of a solvent-based rubber adhesive. More specifically, it is usually necessary to roughen the surface of the component adjacent the join, prior to 2 applying the solvent-based rubber-solution, but even then the resulting bond strength is variable.
Apart from the labour involved, the use of the solventbased method has significant disadvantages and dangers, and it is one of the objects of the present invention to provide a method of manufacturing latex rubber products by which the necessity for use of a solvent-based adhesive for bonding in circumstances such as those referred to above, can be avoided.
According to one aspect of the present invention there is provided a method of manufacturing a rubber product for thermal-adhesive bonding with a polyurethane surface, wherein the product is formed from a latex-rubber composition including polyurethane.
According to another aspect of the invention there is provided a method for establishing a bond between a rubber product and a polyurethane surface, wherein said product is formed from a latex-rubber composition including polyurethane, and the bond is established with hot-melt adhesive.
The product according to either aspect may be formed by dip-moulding into said composition. In this regard especially, it has been found that the inclusion of the polyurethane in the dipping composition results in significantly improved adhesion-properties for the resultant latex rubber product. The proportion by dry weight of polyurethane latex in the composition is desirably substantially within the range of 5 to 25 parts per 100 parts of the base rubber, which may be natural or synthetic rubber latex; use of a proportion by dry weight 35 of substantially 10 parts of polyurethane to 100 parts of base rubber has been found to be of especial advantage.
3 Methods of manufacture and bonding according to the present invention will now be described, by way of example, with reference to the accompanying drawing, in which:
Figure 1 is illustrative of a rubber dip-moulding method of manufacture according to the invention; and Figure 2 is a sectional view of a bonded joint according to the invention, involving a rubber product manufactured as illustrated in Figure 1.
The methods to be described are for the production of latex rubber articles and for the establishment of bonds with such articles. More specifically, the method to be described is for use in the manufacture of dry (waterproof) diving suits. such suits are principally of a polyurethane material for establishing a barrier to water, with nylon fabric on its inner surface for strength, heat insulation and comfort for the wearer. Component parts of the suit, in particular cuffs, ankles and a collar for making it watertight at the wrists, ankles and neck, are joined to the sleeves, legs and trunk of the suit firstly by stitching. A firm seal is then established at the joint by a tape overlying the join.
The cuffs and collar are manufactured as latex rubber products. The method of manufacture as applied to cuff- production (collar production is essentially the same) will now be described with reference to Figure 1. The method to be described employs the coagulant dippingmethod but other dipping methods may be used.
Referring to Figure 1, a former 1 of porcelain, metal, or clay, having a shape conforming to the configuration of (in this case) the cuff, is first coated with a chemical 4 coagulant such as a solution in water of calcium nitrate, and then dried. The former 1 is then dipped into a bath 2 of a liquid composition of natural (or synthetic) rubber-latex containing polyurethane latex. Dipping in the bath 2 results in the build up of a coating 3 of the composition on the former 1, and once this has reached a desired thickness, the former 1 is withdrawn and the coating then dried. The dried coating 3 is stripped from the former 1 and halogenated in the conventional way to provide a comfortable, tack-free surface. Immersion in 0.3% chlorine water for 2 minutes, followed by rinsing in clean water, has been found suitable to achieve this.
The resulting product is dried and then trimmed to provide the desired cuff ready for attachment to the polyurethane body of the diving suit.
Attachment of the latex rubber cuff to a sleeve of the diving suit is illustrated in Figure 2 and will now be described.
Referring to Figure 2, the latex rubber cuff 4 is introduced to the sleeve 5 by sliding it into the open end 6 of the sleeve 5 to create a region 7 of overlap between them. (As an alternative, the sleeve 5 may be slid over the open end 6 to create a corresponding, reversed overlap.) The cuff 4 and sleeve 5 are joined by stitching 8 that extends through both of them within the region 7 of their overlap.
The joint between cuff 4 and sleeve 5 is secured and sealed by means of polyurethane tape 9 wrapped fully round and bonded to both of them over the end 6. In this regard, the assembly of cuff 4 and sleeve 5 joined by the stitching 8 is entered into a conventional tapeapplication machine, such as the Queen Light model supplied by West Bridgford Machine Co. Ltd. of West Bridgford, Nottingham. Using such a machine, the region 7 and the adjoining area of the cuff 4 beyond the end 6, are offered up to the nip between two rollers, to be fed through the nip along with the tape 9.
The tape 9 has a thermoplastic adhesive on one side and is fed into the nip with the adhesive coating in contact with the cuff 4 and sleeve 5 to bridge the end 6 and overlie the stitching 8. A blast of very hot air to melt the adhesive is directed between the tape 9 and the junction of the sleeve 5 and cuff 4 immediately before they come together under compression of the nip, so that when the assembly has cooled the tape 9 seals the joint and strengthens attachment of the cuff 4 to the sleeve 5. The thermoplastic adhesive readily establishes a firm bond with the latex rubber cuff 4 as well as with the polyurethane sleeve 5. There is good adhesion between the thermoplastic adhesive and the latex rubber as a result of the inclusion of polyurethane in the composition of the cuff 4.
In the prior art, namely without the inclusion of polyurethane in the composition, thermoplastic adhesive cannot be used because its adhesion to the latex rubber surface is so poor, and an acceptable joint can only be obtained using a solvent-based rubber adhesive. This is a costly process and solvent-based adhesive solutions vary in efficiency. Such solutions are also hazardous substances, being either toxic or inflammable. The present invention overcomes these problems and enables the bonding to be achieved in a simple manner without attendant health and other problems.
The liquid composition used for the dipping process according to this invention may, for example, be composed of a dispersion of 57% by volume of prevulcanised natural rubber latex in water mixed with a dispersion of 40% by volume of polyurethane latex in water in the proportions 6 5:2. Vita Liquid Polymers Ltd of Wythenshawe, Manchester supply suitable prevulcanised natural rubber latex as Grade 5936M and polyurethane latex as LC 8673. The composition, which may include stabilisers, colourants and other conventional agents, preferably also includes a 50% water-based emulsion of a di-iso-octyl phthalate plasticiser in equal amount to the polyurethane latex emulsion. The plasticiser is included to reduce the effect of stiffening of the finished product that results from inclusion of the polyurethane latex.
7

Claims (16)

Claims:
1. A method of manufacturing a rubber product for thermal-adhesive bonding with a polyurethane surface, wherein the product is formed from a latex-rubber composition including polyurethane.
2. A method according to Claim 1 wherein the rubber product is a cuffankle- or collar-seal for a polyurethane-coated diving-suit.
3. A method for establishing a bond between a rubber product and a polyurethane surface, wherein said product is formed from a latex-rubber composition including polyurethane, and the bond is established with hotmelt adhesive.
4. A method according to Claim 3 wherein the rubber product is a cuffseal, an ankle-seal or a collar-seal for a polyurethane-coated divingsuit.
5. A method according to Claim 4 wherein the seal and suit are brought together and held overlapping one another, and a join between them is established where they overlap by polyurethane tape that overlies the region of overlap and is bonded to them with the hot-mel adhesive.
6. A method according to Claim 5 wherein the seal and the suit are stitched together within the region of overlap prior to application of the tape.
7. A method according to any one of Claims 1 to 6 wherein the product is formed by dip-moulding into said composition.
8 8. A method according to Claim 7 wherein the proportion by dry weight of polyurethane latex in said composition is substantially within the range of 5 to 25 parts per 100 parts of the base rubber.
9. A method according to Claim 8 wherein the proportion by dry weight of polyurethane is substantially 10 parts to 100 parts of the base rubber.
10. A method according to any one of Claims 1 to 9 wherein said composition is a dispersion of natural rubber latex including polyurethane as aforesaid.
11. A method according to any one of Claims 1 to 10 wherein said composition comprises an aqueous dispersion of rubber latex and an aqueous dispersion of polyurethane latex mixed together.
12. A method according to any one of Claims 1 to 11 wherein said composition includes a plasticiser.
13. A method according to claim 12 wherein the plasticiser is a di-isooctyl phthalate plasticiser.
14. A method of manufacturing a rubber cuff- ankle- or collar-seal for a polyurethane-coated diving-suit, substantially as hereinbefore described with reference to Figure 1 of the accompanying drawing.
15. A method for manufacturing a rubber cuff- ankle- or collar-seal and attaching it to a polyurethane-coated diving-suit, substantially as hereinbefore described with reference to the accompanying drawing.
16. The product of a method according to any one of Claims 1 to 15.
GB0108658A 2000-04-06 2001-04-06 Latex rubber products Withdrawn GB2360974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0008338.6A GB0008338D0 (en) 2000-04-06 2000-04-06 Latex rubber products

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GB0108658D0 GB0108658D0 (en) 2001-05-30
GB2360974A true GB2360974A (en) 2001-10-10

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GBGB0008338.6A Ceased GB0008338D0 (en) 2000-04-06 2000-04-06 Latex rubber products
GB0108658A Withdrawn GB2360974A (en) 2000-04-06 2001-04-06 Latex rubber products

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1074370A2 (en) * 1999-07-28 2001-02-07 Precision Dippings Marketing Limited Rubber articles adapted to make weldable seals; their manufacture and use
GB2416667A (en) * 2004-08-03 2006-02-08 Douglas King Rubber attachments for diving suits
CN109703038A (en) * 2019-01-11 2019-05-03 赵雪虎 A kind of plastic bottle finishing is mechanical

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB977929A (en) * 1962-02-16 1964-12-16 Cirrus Aktiebolag Improvements in products of plastic and rubber and in their manufacture
DE1292376B (en) * 1958-04-24 1969-04-10 Henkel & Cie Gmbh Process for joining polyurethane layers with natural rubber or synthetic rubber layers
JPS53101061A (en) * 1977-02-17 1978-09-04 Dainichi Seika Kogyo Kk Resin composition for mechanical foam coating
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EP1074370A3 (en) * 1999-07-28 2002-09-04 Precision Dippings Marketing Limited Rubber articles adapted to make weldable seals; their manufacture and use
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