GB2276336A - Coating foam rubber - Google Patents

Coating foam rubber Download PDF

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Publication number
GB2276336A
GB2276336A GB9408797A GB9408797A GB2276336A GB 2276336 A GB2276336 A GB 2276336A GB 9408797 A GB9408797 A GB 9408797A GB 9408797 A GB9408797 A GB 9408797A GB 2276336 A GB2276336 A GB 2276336A
Authority
GB
United Kingdom
Prior art keywords
silicone rubber
foamed
rubber
block
foamed material
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.)
Granted
Application number
GB9408797A
Other versions
GB2276336B (en
GB9408797D0 (en
Inventor
Aaron Sherman
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.)
Individual
Original Assignee
Individual
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
Priority claimed from GB909024596A external-priority patent/GB9024596D0/en
Application filed by Individual filed Critical Individual
Priority to GB9408797A priority Critical patent/GB2276336B/en
Publication of GB9408797D0 publication Critical patent/GB9408797D0/en
Publication of GB2276336A publication Critical patent/GB2276336A/en
Application granted granted Critical
Publication of GB2276336B publication Critical patent/GB2276336B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36—After-treatment
    • C08J9/40—Impregnation
    • C08J9/42—Impregnation with macromolecular compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/28—Materials for coating prostheses
    • A61L27/34—Macromolecular materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L27/56—Porous materials, e.g. foams or sponges
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/28—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for medicine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/52—Mammary prostheses
    • 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
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C08J2205/05—Open cells, i.e. more than 50% of the pores are open
    • 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
    • C08J2307/00—Characterised by the use of natural rubber
    • 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
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers

Abstract

A composite foamed product, particularly a prosthesis, is prepared by impregnating a silicone rubber into an open-celled foamed material. The foamed material may be a natural rubber sheet (10) and the silicone rubber is urged into the cells of the foamed material by means of a roller (12). <IMAGE>

Description

FOAMED PRODUCTS Field of the Invention This invention relates to the manufacture of foamed products and is particularly concerned with the manufacture of foamed products for use as prostheses, which term is to be interpreted broadly as including any form of artificial or replacement part of the human body. It includes a medical model such as may be used to simulate tissue, flesh or skin.
It is an object of the present invention to provide an improved method of making a foamed product.
Summary of the Invention According to the present invention there is provided a method of manufacturing a foamed product, said method comprising: a) providing a block or pad of an open-celled foamed material, b) applying a controlled amount of a silicone rubber to a surface of the block or pad, c) causing the silicone rubber to penetrate the cells of the foamed material by the application of pressure so that the interiors of the cells become coated with the silicone rubber, and d) causing or allowing curing of the silicone rubber so as to produce a composite open-celled foamed product which has the elasticity and resilience characteristics of the foamed material but for which the whole, or substantially the whole, of the exposed surface of the product, including the surfaces of the cells, is afforded by a silicone.
The foamed material is preferably foamed natural rubber.
The applied silicone rubber may be caused to penetrate the cells of the foamed rubber by passing the block or pad backwards and forwards between a pair of rollers. The action of the rollers may be such as to cause the silicone rubber to be dispersed substantially uniformly throughout the foamed block or pad.
The arrangement may alternatively be such that, after a measured quantity of the silicone rubber has been applied to the surface of the foamed material, a roller is applied to the surface to cause the silicone rubber to penetrate the cells of the foamed material.
In a further alternative arrangement a measured quantity of the silicone rubber is prepared and a selected fraction of this quantity is applied to the surface of a foamed rubber block, a roller is then applied to the surface of the block and the silicone rubber is caused to penetrate the pores of the rubber block, a second fraction of the total quantity of the silicone rubber is then applied to the surface of the block and the process is repeated until all the silicone rubber has been used.
Brief Description of the Drawing The single figure of the accompanying drawing is a diagrammatic representation of a stage in the manufacture of a composite foamed product.
Description of the Preferred Embodiment A sheet of open-celled foamed natural rubber 10 is prepared for treatment by attaching a thin sheet of gauze to the underside thereof. The gauze is bonded to the rubber sheet 10 and, after curing in an oven and washing, the rubber sheet 10 is placed on a work surface 11 with the gauze disposed beneath the rubber sheet 10. The rubber sheet 10 may be, for example, 10, 15 or 20 mm. in thickness, depending on the required end use of the final product, and it may be, for example, 300 mm. by 500 mm. in area.
A quantity of an RTV silicone rubber, i.e. a room temperature vulcanised silicone rubber, containing a thinner, to obtain the required viscosity, and a catalyst, to effect curing of the silicone rubber, is then prepared and a third of the prepared quantity of silicone rubber is spread substantially evenly over the surface of the rubber sheet 10.
The applied silicone rubber is combed and then a roller 12 is moved over the surface of the rubber sheet to apply a controlled pressure to the surface of the sheet and to cause the silicone rubber to penetrate the pores of the foamed rubber sheet. Once the initial amount of silicone rubber has been rolled in, a second third of the initial quantity of silicone rubber is spread on to the surface of the rubber sheet 10 and this second applied layer is then, in its turn, rolled into the rubber sheet 10.
Then, once this second layer has been rolled into the rubber sheet 10, the third and final portion of the prepared quantity of silicone rubber is spread over the surface of the rubber sheet 10 and it, in turn, is rolled in.
The distance by which the applied silicone rubber penetrates the surface of the rubber sheet 10 will depend, for example, on the initial viscosity of the silicone rubber and on the total quantity of silicone rubber which is used. The distance of penetration may be, for example, 2 or 3 mm. if the final foamed product is to be used as a medical model or simulation organ on which surgical techniques can be practised.
After the three layers of silicone rubber have been rolled into the rubber sheet 10, the impregnated sheet is then allowed to stand at room temperature for about twenty four hours to allow curing of the RTV silicone rubber. It is to be appreciated that the silicone rubber can be applied as a single portion to the surface of the rubber sheet, as two portions, or as four or more portions. It has been found, however, that application of the silicone rubber in three portions is relatively efficient and produces an applied silicone rubber coating which is reasonably uniformly dispersed throughout the area of the rubber sheet 10.
After curing of the silicone rubber, the rubber sheet 10 can then be cut into segments of the required size, depending on the use to which the material is to be put. Although the above example has been given of the application of the silicone rubber impregnant to only one surface of the rubber sheet 10, it is to be appreciated that the procedure outlined above can be repeated to obtain a foamed rubber product having treated upper and lower surfaces.
It is also to be appreciated that, although in the example given above, the silicone rubber impregnant only penetrated a fraction of the thickness of the rubber sheet 10, e.g. 2 or 3 mm. in respect of a total thickness of 10 or 15 mm., the amount of silicone rubber which is used may be such that it penetrates the full depth of the rubber sheet 10.
In some cases, it may be preferable to apply the pressure to the silicone rubber to cause it to penetrate the open cells of the foamed material by passing the rubber sheet 10 between a pair of rollers, the rubber sheet 10 being fed backwards and forwards between the rollers until the applied silicone rubber has been caused to penetrate the foamed material to the required extent.
If the rubber sheet is passed between a pair of rollers, the silicone rubber will tend to be dispersed throughout the whole of the foamed material, and layers of silicone rubber can be applied to both sides of the rubber sheet before it is passed between the rollers. The concentration of silicone within the foamed material will tend to be greatest adjacent the upper and lower surfaces of the rubber sheet.
Thus, if the required characteristics of the final product call for the application of silicone to the upper and lower surface portions of the rubber sheet, passage of the rubber sheet between a pair of rollers will be the preferred method of manufacture.
This is in contrast with the method illustrated in the drawing in which, by the use of a single roller 12 which is passed over the upper surface of the rubber sheet 10, the applied silicone will be concentrated in the portion of the foamed rubber sheet 10 adjacent the upper surface thereof.
Although the invention has been developed specifically for the production of prostheses, the method can be applied to the production of other foamed products the characteristics of which are such that the application of a silicone to the surfaces of at least the cells adjacent the surface of the article will be of benefit. The method can thus be applied to the production of, for example, the mouths and other parts of puppets or to models produced for exhibition purposes, such as model prehistoric or other animals.

Claims (7)

Claims:
1. A method of manufacturing a foamed product, said method comprising: a) providing a block or pad of an open-celled foamed material, b) applying a controlled amount of a silicone rubber to a surface of the block or pad, c) causing the silicone rubber to penetrate the cells of the foamed material by the application of pressure so that the interiors of the cells become coated with the silicone rubber, and d) causing or allowing curing of the silicone rubber so as to produce a composite open-celled foamed product which has the elasticity and resilience characteristics of the foamed material but for which the whole, or substantially the whole, of the exposed surface of the product, including the surfaces of the cells, is afforded by a silicone.
2. A method as claimed in Claim 1, in which the foamed material is foamed natural rubber.
3. A method as claimed in Claim 2, in which the applied silicone rubber is caused to penetrate the cells of the foamed rubber by passing the block or pad backwards and forwards between a pair of rollers.
4. A method as claimed in Claim 3, in which the action of the rollers is such as to cause the silicone rubber to be dispersed substantially uniformly throughout the foamed block or pad.
5. A method as claimed in Claim 1, in which, after a measured quantity of the silicone rubber has been applied to the surface of the foamed material, a roller is applied to the surface to cause the silicone rubber to penetrate the cells of the foamed material.
6. A method as claimed in Claim 1, in which a measured quantity of the silicone rubber is prepared and a selected fraction of this quantity is applied to the surface of a foamed rubber block, a roller is then applied to the surface of the block and the silicone rubber is caused to penetrate the pores of the rubber block, a second fraction of the total quantity of silicone rubber is then applied to the surface of the block and the process is repeated until all the silicone rubber has been used.
7. A method as claimed in Claim 1, and substantially as hereinbefore described with reference to the accompanying drawings.
GB9408797A 1990-11-13 1991-10-15 Foamed products Expired - Fee Related GB2276336B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9408797A GB2276336B (en) 1990-11-13 1991-10-15 Foamed products

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB909024596A GB9024596D0 (en) 1990-11-13 1990-11-13 Foamed products
GB9121797A GB2249738B (en) 1990-11-13 1991-10-15 Foamed products
GB9408797A GB2276336B (en) 1990-11-13 1991-10-15 Foamed products

Publications (3)

Publication Number Publication Date
GB9408797D0 GB9408797D0 (en) 1994-06-22
GB2276336A true GB2276336A (en) 1994-09-28
GB2276336B GB2276336B (en) 1995-07-19

Family

ID=26297943

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9408797A Expired - Fee Related GB2276336B (en) 1990-11-13 1991-10-15 Foamed products

Country Status (1)

Country Link
GB (1) GB2276336B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19650143A1 (en) * 1996-12-04 1998-06-10 Reichenecker Hans Storopack Expanded plastics moulding with an outer plastic coating and coating application process
EP3589421A4 (en) * 2017-02-28 2021-01-06 Cidra Corporate Services LLC Processes for coating reticulated foams

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894165A (en) * 1973-05-23 1975-07-08 G S Staunton & Co Inc Coated flexible reticulate structures and method for the preparation thereof
DE2932090A1 (en) * 1979-08-08 1981-02-26 Norbert Lutz Elastic moulded supports of silicone rubber impregnated polyurethane - for linings, protective inserts for shoes and transporting packings
WO1989008555A1 (en) * 1988-03-14 1989-09-21 Sili-Tex, Inc. Silicone polymer encapsulated substrates

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894165A (en) * 1973-05-23 1975-07-08 G S Staunton & Co Inc Coated flexible reticulate structures and method for the preparation thereof
DE2932090A1 (en) * 1979-08-08 1981-02-26 Norbert Lutz Elastic moulded supports of silicone rubber impregnated polyurethane - for linings, protective inserts for shoes and transporting packings
WO1989008555A1 (en) * 1988-03-14 1989-09-21 Sili-Tex, Inc. Silicone polymer encapsulated substrates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19650143A1 (en) * 1996-12-04 1998-06-10 Reichenecker Hans Storopack Expanded plastics moulding with an outer plastic coating and coating application process
EP3589421A4 (en) * 2017-02-28 2021-01-06 Cidra Corporate Services LLC Processes for coating reticulated foams

Also Published As

Publication number Publication date
GB2276336B (en) 1995-07-19
GB9408797D0 (en) 1994-06-22

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19991015