GB1287410A - Suspension polymerisation process - Google Patents
Suspension polymerisation processInfo
- Publication number
- GB1287410A GB1287410A GB6125168A GB6125168A GB1287410A GB 1287410 A GB1287410 A GB 1287410A GB 6125168 A GB6125168 A GB 6125168A GB 6125168 A GB6125168 A GB 6125168A GB 1287410 A GB1287410 A GB 1287410A
- Authority
- GB
- United Kingdom
- Prior art keywords
- suspending agent
- copolymer
- vinyl alcohol
- suspending
- pentane
- 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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F291/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Polymerisation Methods In General (AREA)
Abstract
1287410 Polymers of vinyl aromatic compounds; foamable polystyrene MONSANTO CHEMICALS Ltd 3 Dec 1969 [24 Dec 1968] 61251/68 Headings C3C and C3P Vinylaromatic polymers are prepared by polymerizing the monomer in an aqueous suspension system comprising a first suspending agent which is a vinyl alcohol homopolymer or a copolymer containing at least 95 mol. per cent of polymerized vinyl alcohol, a second suspending agent which is a copolymer containing 75-91 mol. per cent of vinyl alcohol, and a further suspending agent which is a copolymer of an acrylic acid (including alpha-substituted acrylic acids) and an acrylate (including alpha-substituted) ester, the first two suspending agents being present in the system before the proportion by weight of polymer is 30%, based on the total weight of polymer and monomer, and the further suspending agent being added after that proportion reaches 20% but not before the first and second suspending agents are present in the system. Blowing agents such as pentane may be present during the polymerization. The aqueous system may also contain a water-soluble inorganic salt or a surface active agent. In the examples styrene is polymerized in an aqueous solution containing a 98% hydrolysed polyvinyl acetate and an 88% hydrolysed polyvinyl acetate as first and second suspending agents respectively, benzoyl peroxide tertiary butylperbenzoate and pentane, and after 6 hours of polymerization an aqueous solution of a copolymer of acrylic acid and 2-ethylhexyl acetate is added as the further suspending agent. The product is foamable beads of polystyrene which can be prefoamed with steam.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6125168A GB1287410A (en) | 1968-12-24 | 1968-12-24 | Suspension polymerisation process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6125168A GB1287410A (en) | 1968-12-24 | 1968-12-24 | Suspension polymerisation process |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1287410A true GB1287410A (en) | 1972-08-31 |
Family
ID=10486781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6125168A Expired GB1287410A (en) | 1968-12-24 | 1968-12-24 | Suspension polymerisation process |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1287410A (en) |
-
1968
- 1968-12-24 GB GB6125168A patent/GB1287410A/en not_active Expired
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
PCNP | Patent ceased through non-payment of renewal fee |