GB1024195A - Production of finely divided expandable thermoplastics - Google Patents
Production of finely divided expandable thermoplasticsInfo
- Publication number
- GB1024195A GB1024195A GB1281/63A GB128163A GB1024195A GB 1024195 A GB1024195 A GB 1024195A GB 1281/63 A GB1281/63 A GB 1281/63A GB 128163 A GB128163 A GB 128163A GB 1024195 A GB1024195 A GB 1024195A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acrylonitrile
- added
- pentane
- expanding agent
- expanding
- 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
- C08J9/16—Making expandable particles
- C08J9/20—Making expandable particles by suspension polymerisation in the presence of the blowing agent
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)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
A finely-divided expandable thermoplastic is produced by polymerization of monomers in fine dispersion in an aqueous medium, a liquid or liquefiable gas expanding agent being added when the final spectrum of polymer particles sizes has been established the addition being completed at the latest when polymerization is 95% complete. Specified monomers are: styrene, vinyl chloride, vinylidene chloride, vinyl ethyl ether, vinyl acetate, N-vinyl carbazole, ethyl acrylate, acrylonitrile and methacrylamide. Specified expanding agents which are non-solvents for the polymer are: propane, butane, pentane, hexane, cyclopentane, cyclohexane, dichlorodifluoromethane and 1 : 2 : 2-trifluoro-1 : 1 : 2-trichloro-ethane. The process may be carried out at 50-100 DEG C. in the presence of 0.2-0.5% of a catalyst, e.g. benzoyl peroxide or azoisobutyronitrile. Pressure due to the vapour pressure of the reactants may be applied. Additives may be dyes, plasticizers, flame retardants, e.g. chloroparaffins or brominated oligomers of butadiene, and/or protective colloids. The expanding may be added to the extent of 3-15% of the monomer and may contain a solvent, e.g. methanol or ethanol but one component should have a b.p. below the softening point of the mixture. In Example 1, sodium pyrophosphate, styrene acrylonitrile, n-butyl stearate, benzoyl peroxide and a copolymer of N-vinylpyrrolidone and methyl acrylate are mixed in water and heated. Pentane is added as expanding agent. In the other examples, (2) the acrylonitrile and n-butyl stearate are omitted, (3) hexabromocyclododecane is added in place of acrylonitrile and n-butyl-stearate and the expanding agent is a pentane/1 : 1 : 2 - trifluoro - 1 : 2 : 2 - trichloroethane mixture, (4) methyl methacrylate is added in place of acrylonitrile and n-butyl stearate and the expanding agent is a pentane/methanol mixture.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB65570A DE1152261B (en) | 1962-01-19 | 1962-01-19 | Process for the production of finely divided, foamable thermoplastics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1024195A true GB1024195A (en) | 1966-03-30 |
Family
ID=66428756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1281/63A Expired GB1024195A (en) | 1962-01-19 | 1963-01-11 | Production of finely divided expandable thermoplastics |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1152261B (en) |
| FR (1) | FR1345924A (en) |
| GB (1) | GB1024195A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010115671A1 (en) | 2009-04-07 | 2010-10-14 | Evonik Stockhausen Gmbh | Use of hollow bodies for producing water-absorbent polymer structures |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1100955B (en) * | 1958-09-19 | 1961-03-02 | Dow Chemical Co | Process for the manufacture of a polymeric product of controlled particle size obtained by suspension polymerization of an alkenyl aromatic compound |
-
1962
- 1962-01-19 DE DEB65570A patent/DE1152261B/en active Pending
-
1963
- 1963-01-11 GB GB1281/63A patent/GB1024195A/en not_active Expired
- 1963-01-18 FR FR921877A patent/FR1345924A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010115671A1 (en) | 2009-04-07 | 2010-10-14 | Evonik Stockhausen Gmbh | Use of hollow bodies for producing water-absorbent polymer structures |
| DE102009016404A1 (en) | 2009-04-07 | 2010-10-21 | Evonik Stockhausen Gmbh | Use of hollow bodies for producing water-absorbing polymer structures |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1152261B (en) | 1963-08-01 |
| FR1345924A (en) | 1963-12-13 |
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