GB950376A - Novel cross-linked foams of elastomeric copolymers and a process for the preparation thereof - Google Patents
Novel cross-linked foams of elastomeric copolymers and a process for the preparation thereofInfo
- Publication number
- GB950376A GB950376A GB488162A GB488162A GB950376A GB 950376 A GB950376 A GB 950376A GB 488162 A GB488162 A GB 488162A GB 488162 A GB488162 A GB 488162A GB 950376 A GB950376 A GB 950376A
- Authority
- GB
- United Kingdom
- Prior art keywords
- latex
- ethylene
- converted
- water
- foam
- 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
Links
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
-
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
In a process for the preparation of a cross-linked foam of an elastomeric copolymer, a gelled froth of a latex of an elastomeric copolymer of at least two olefins with the formula CH2=CHR wherein R is hydrogen or an alkyl radical having up to 4 carbon atoms is subjected to ionizing radiation. Specified olefins are ethylene, propylene, butene-1, ethylene-pentene-1 and propylene-hexene-1. The polymer contains from about 20 to about 90 or even up to 98 mole per cent. of polymerized ethylene with the balance being the other olefin. The copolymer is converted to an emulsion by homogenizing its solution in a hydrocarbon solvent with water and an emulsifying agent, using a homogenizer or colloid mill. By adding the emulsifying agent in two portions a water-in-oil emulsion is first formed and this is then converted to oil-in-water. Suitable emulsifying agents are sodium and potassium soaps, and anionic, cationic and nonionic surface-active agents. The emulsion is converted to a latex by flashing off the hydrocarbon solvent and the latex is concentrated by centrifuging. The latex is converted to a foam by adding further soap, and a stabilizer such as a reaction product of ethyl chloride, ammonia and formaldehyde and whipping the mixture into a froth. Gelling is then effected by adding zinc oxide and a suspension of sodium silicofluoride. The gelled froth is then cross-linked by ionizing radiation, suitably about 25 to 200 megarads, at 2.5 megarads per minute, from a Van de Graaff accelerator. X-ray or gamma-ray sources can also be used. In an example the elastomer is ethylene-propylene copolymer having 63 mole per cent. of polymerized ethylene. A 6.8% solution in benzene is emulsified in an equal volume of water to which potassium soap of disproportionated rosin acid has been added. Solvent is removed under vacuum to give a latex to which potassium oleate is added and further concentration is then effected by centrifuging. Conversion to a foam by the above method is then carried out. Specifications 856,733, 856,735, 856,736 and 856,737 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8827261A | 1961-02-10 | 1961-02-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB950376A true GB950376A (en) | 1964-02-26 |
Family
ID=22210404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB488162A Expired GB950376A (en) | 1961-02-10 | 1962-02-08 | Novel cross-linked foams of elastomeric copolymers and a process for the preparation thereof |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE613666A (en) |
| GB (1) | GB950376A (en) |
-
1962
- 1962-02-08 GB GB488162A patent/GB950376A/en not_active Expired
- 1962-02-08 BE BE613666A patent/BE613666A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE613666A (en) | 1962-08-08 |
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