GB813941A - Method for forming thermoplastic resinous materials into expanded foam structures and articles thereby obtained - Google Patents
Method for forming thermoplastic resinous materials into expanded foam structures and articles thereby obtainedInfo
- Publication number
- GB813941A GB813941A GB39508/56A GB3950856A GB813941A GB 813941 A GB813941 A GB 813941A GB 39508/56 A GB39508/56 A GB 39508/56A GB 3950856 A GB3950856 A GB 3950856A GB 813941 A GB813941 A GB 813941A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- carbon dioxide
- polystyrene
- dichlorodifluoromethane
- copolymers
- 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
- C08J9/12—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 by a physical 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
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/10—Applying counter-pressure during expanding
-
- 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
- B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
- B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
-
- 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
- B29C44/3415—Heating or cooling
- B29C44/3426—Heating by introducing steam in the mould
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
At least 50 per cent by weight of a material suitable for foaming has the general formula ArCR = CH2 in which Ar is an aromatic radical, and R has an H atom and a CH3 radical. Polystyrene is preferably used but polyvinyltoluene and its copolymers may advantageously be used, as may polymers and copolymers of a -methyl styrene, ar-methyl styrene, vinylidene chloride, and mono and dichlorostyrene and ar-dimethyl styrene. A foamed structure, e.g. an insulating panel, is formed by a process which comprises compression moulding polystyrene granules at a fusing temperature into a coherent sheet; then incorporating therein under pressure a gaseous blowing agent, e.g. carbon dioxide, dichlorodifluoromethane, pentane, or other low-boiling hydrocarbon; then heating to a foaming temperature in a bath of ethylene glycol. The carbon dioxide may amount to 2-12 per cent by weight of the polystyrene sheet and is applied under pressure of 200-2000 pounds/square inch. If dichlorodifluoromethane is used its percentage by weight may be 5-15. Numerical examples are given.ALSO:A foamed structure, e.g. an insulating panel, is formed from a thermoplastic resinous material, for example polystyrene, with its surface characteristics selectively controlled, by a process which comprises compression moulding the resinous granules at a fusing temperature into a coherent mass; then incorporating in the mass under pressure, a gaseous blowing agent, for example carbon dioxide, dichlorodifluoromethane, pentane, or other low-boiling hydrocarbons; and then heating the said mass in a bath of ethylene glycol, to a foaming temperature. The carbon dioxide which may amount to 2-12 per cent. by weight of the polystyrene sheet is applied under a pressure of from 200-2,000 pounds per sq. inch. If dichlorodifluoromethane is preferred to carbon dioxide its percentage by weight may be from 5-15. At least 50 per cent. by weight of a suitable foamable material has the general formula Ar-CR=CH2 in which Ar is an aromatic radical and R has an H atom and a CH3 radical. Polyvinyltoluene and its copolymers may advantageously be used, as may polymers and copolymers of a -methyl styrene, ar-methyl styrene, vinylidene chloride, and mono- and di-chlorostyrene and ar-dimethyl styrene. The foamed product, which may be at least three times its unexpanded volume, can be hot worked immediately after expansion by compression moulding techniques. Numerical examples are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US813941XA | 1956-02-29 | 1956-02-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB813941A true GB813941A (en) | 1959-05-27 |
Family
ID=22163860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39508/56A Expired GB813941A (en) | 1956-02-29 | 1956-12-28 | Method for forming thermoplastic resinous materials into expanded foam structures and articles thereby obtained |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB813941A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0113903A2 (en) * | 1982-12-20 | 1984-07-25 | Japan Styrene Paper Corporation | Process for producing prefoamed polymer particles |
-
1956
- 1956-12-28 GB GB39508/56A patent/GB813941A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0113903A2 (en) * | 1982-12-20 | 1984-07-25 | Japan Styrene Paper Corporation | Process for producing prefoamed polymer particles |
| EP0113903A3 (en) * | 1982-12-20 | 1985-06-19 | Japan Styrene Paper Corporation | Process for producing prefoamed polymer particles |
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