GB973261A - Production of shaped articles from expandable thermoplastics - Google Patents
Production of shaped articles from expandable thermoplasticsInfo
- Publication number
- GB973261A GB973261A GB3648962A GB3648962A GB973261A GB 973261 A GB973261 A GB 973261A GB 3648962 A GB3648962 A GB 3648962A GB 3648962 A GB3648962 A GB 3648962A GB 973261 A GB973261 A GB 973261A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plastic
- mould
- styrene
- expanding agent
- polystyrene
- 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
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
-
- 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
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
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
Expanded shaped articles are produced by plasticizing a finely-divided expandable thermo-plastic containing an expanding agent in the cylinder of a screw injection moulding machine at temperatures above the softening point of the plastic and at a pressure at least equal to the pressure of the expanding agent at the prevailing temperature, and introducing the plasticized plastic through a nozzle into a mould from which air can escape, the volume of unexpanded plastic being less than the volume of the mould, and interrupting the communication between the plasticizing cylinder and the mould by closing the nozzle after the plastic has been introduced. Expanded articles of thermoplastics, e.g. polystyrene, styrene co-polymers, impact-resistant polystyrene made by polymerizing monomeric styrene and rubber, polyvinyl chloride, polyethylene, polypropylene, polisobutylene, polyamides, polyurethanes and polyvinyl carbazoles may be prepared. The expanding agent may be a hydrocarbon, halohydrocarbon, ammonium bicarbonate, ammonium citrate, sodium bicarbonate, a mixture of an alkali metal carbonate or bicarbonate and an organic acid, azo compounds, nitroso compounds and hydrazine derivatives. Examples relate to the foaming of polystyrene, a co-polymer derived from styrene and acrylonitrile, polymethyl methacrylate and polyethylene.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB0064154 | 1961-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB973261A true GB973261A (en) | 1964-10-21 |
Family
ID=6974274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3648962A Expired GB973261A (en) | 1961-09-27 | 1962-09-26 | Production of shaped articles from expandable thermoplastics |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB973261A (en) |
| NL (1) | NL283655A (en) |
-
0
- NL NL283655D patent/NL283655A/xx unknown
-
1962
- 1962-09-26 GB GB3648962A patent/GB973261A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL283655A (en) |
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