GB1257724A - - Google Patents
Info
- Publication number
- GB1257724A GB1257724A GB1257724DA GB1257724A GB 1257724 A GB1257724 A GB 1257724A GB 1257724D A GB1257724D A GB 1257724DA GB 1257724 A GB1257724 A GB 1257724A
- Authority
- GB
- United Kingdom
- Prior art keywords
- extruder
- temperature
- polymeric substances
- weight
- expanding agent
- 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
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/461—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length dispensing apparatus, e.g. dispensing foaming resin over the whole width of the moving surface
-
- 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
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)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
1,257,724. Moulding expanded granules. SOC. ITALIANA RESINE S.p.A. 24 June, 1969 [15 July, 1968], No. 31923/69. Heading B5A. [Also in Division C3] An extrusion process for continuously preparing expandable compositions containing polystyrene polymers, styrene copolymers with less than 1% by wt. divinyl benzene or graft copolymers of styrene with less than 20% by weight of elastomeric substances comprises charging the polymeric substances into an extruder together with citric, oxalic or tartaric acid or an alkali metal salt thereof in amount 0À2 to 1À0% by weight with respect to the polymeric substances, contacting the molten products with an expanding agent comprising an halogenated aliphatic hydrocarbon of boiling point in the range - 30‹ to + 30‹ C. in amount ranging from 5 to 10% by weight, with respect to the polymeric substances in the extruder, at a temperature of 190‹ to 230‹ C. and maintaining the pressure sufficiently high to keep the expanding agent in the liquid phase, homogenizing the polymeric substances and expanding agent while lowering the temperature of the mixture within the extruder such that the temperature of the mass at the discharge end of the extruder is 100‹ to 130‹ C., and granulating the homogenized product leaving the extruder, the temperature being simultaneously lowered to ambient temperature. The granulation may be effected by forcing the product discharged from the extruder through a foraminated plate and then cutting the resulting threads cooled by a cold water spray.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT839023 | 1968-07-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1257724A true GB1257724A (en) | 1971-12-22 |
Family
ID=11126474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1257724D Expired GB1257724A (en) | 1968-07-15 | 1969-06-24 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1257724A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2162789A (en) * | 1984-07-16 | 1986-02-12 | Cosden Technology | Process for making expandable polystyrene |
-
1969
- 1969-06-24 GB GB1257724D patent/GB1257724A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2162789A (en) * | 1984-07-16 | 1986-02-12 | Cosden Technology | Process for making expandable polystyrene |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |