GB779917A - Improvements relating to the production of foam rubber - Google Patents

Improvements relating to the production of foam rubber

Info

Publication number
GB779917A
GB779917A GB256455A GB256455A GB779917A GB 779917 A GB779917 A GB 779917A GB 256455 A GB256455 A GB 256455A GB 256455 A GB256455 A GB 256455A GB 779917 A GB779917 A GB 779917A
Authority
GB
United Kingdom
Prior art keywords
gas
mould
foamed
rubber
gelled
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.)
Expired
Application number
GB256455A
Inventor
Kenneth Osborne Calvert
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.)
Dunlop Rubber Co Ltd
Original Assignee
Dunlop Rubber Co 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 Dunlop Rubber Co Ltd filed Critical Dunlop Rubber Co Ltd
Priority to GB256455A priority Critical patent/GB779917A/en
Priority to FR1140326D priority patent/FR1140326A/en
Publication of GB779917A publication Critical patent/GB779917A/en
Expired legal-status Critical Current

Links

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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • 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
    • C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • 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
    • C08J2321/00—Characterised by the use of unspecified rubbers
    • C08J2321/02—Latex

Abstract

After a vulcanizable compounded rubber latex is foamed, shaped in a mould and gelled, and before vulcanization, the shaped and gelled foam is treated with a coagulating gas to improve the firmness of structure of the vulcanized product. The preferred coagulating gas is carbon dioxide, and it may be used either alone or mixed with air, nitrogen or other non-active gas. The walls of the mould may be perforated and the gas passed through to the latex under slight pressure, or the mould and its contents may be placed in a chamber containing the gas. It is stated that the process is particularly valuable when the gelling agent is a mixture of zinc oxide and ammonium acetate. The gas may be introduced in the early stages of the vulcanization. Four examples are given in which natural rubber latices, or a mixture of natural and synthetic rubber latices, were foamed with a sodium castor oil soap foaming agent, placed in moulds and gelled, and in each case the foamed rubber in one mould was coagulated by carbon dioxide gas but not that in another mould. It is stated that comparison showed that, after vulcanization, the texture of the foamed rubber coagulated according to the invention was superior to that not so treated.
GB256455A 1955-01-28 1955-01-28 Improvements relating to the production of foam rubber Expired GB779917A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB256455A GB779917A (en) 1955-01-28 1955-01-28 Improvements relating to the production of foam rubber
FR1140326D FR1140326A (en) 1955-01-28 1956-01-23 Foam rubber manufacturing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB256455A GB779917A (en) 1955-01-28 1955-01-28 Improvements relating to the production of foam rubber

Publications (1)

Publication Number Publication Date
GB779917A true GB779917A (en) 1957-07-24

Family

ID=9741799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB256455A Expired GB779917A (en) 1955-01-28 1955-01-28 Improvements relating to the production of foam rubber

Country Status (2)

Country Link
FR (1) FR1140326A (en)
GB (1) GB779917A (en)

Also Published As

Publication number Publication date
FR1140326A (en) 1957-07-19

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