GB1410979A - Process for the dispersion of blowing agents in thermoplastics - Google Patents
Process for the dispersion of blowing agents in thermoplasticsInfo
- Publication number
- GB1410979A GB1410979A GB1724872A GB1724872A GB1410979A GB 1410979 A GB1410979 A GB 1410979A GB 1724872 A GB1724872 A GB 1724872A GB 1724872 A GB1724872 A GB 1724872A GB 1410979 A GB1410979 A GB 1410979A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polymer
- blowing agent
- extruder
- mixture
- extrusion temperature
- 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
- C08J9/14—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 organic
- C08J9/143—Halogen containing compounds
-
- 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
- B29C44/3442—Mixing, kneading or conveying the foamable material
-
- 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
- C08J9/14—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 organic
- C08J9/141—Hydrocarbons
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)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
1410979 Extruding foam plastics IMPERIAL CHEMICAL INDUSTRIES Ltd 23 March 1973 [14 April 1972] 17248/72 Heading B5A [Also in Divisions B1 and C3] A foamed synthetic thermoplastic polymer is made by extruding a mixture of the polymer and 30-120% by wt. of blowing agent from a zone of high to lower pressure using a screw extruder. The blowing agent is injected by metering as a liquid into the extruder at a position where the polymer is molten and divided into a plurality of separate streams. The blowing agent, which is chemically inert towards and is completely miscible with the molten polymer at the high pressure within the extruder and has a b.p. at the high pressure which is above the extrusion temperature and a b.p. at the lower pressure which is below the extrusion temperature. The polymer mixture is free of any solid or liquid that decomposes to form a gas at the extrusion temperature and of any material having a critical temperature below the extrusion temperature. In the examples foamed polyethylene film was formed from polyethylene (optionally a low and high density mixture) and optionally titanium dioxide or silica using as blowing agent pentane or 1,2 - dichloro - 1,1,2,2 - tetrafluoroethane; the polymer mixture was fed into an extruder (see Fig. 1) via a feed hopper (not shown), where it was compressed and melted in an extruder, 1, which is heated externally (not shown), and has a single screw, 2, and compression section, 3; the melt is forced to divide into a plurality of streams in section 4, which is fluted and has a series of axial grooves 5, which are rigidly mounted on the screw (see Fig. 2). The blowing agent is fed to port 6 via metering pump 7 from a reservoir (not shown), and the polymer/blowing agent mixture is forced into a turbine mixing section, 8, having a series of spaced toothed rotors, 9 to 16, which may be staggered (see Fig. 3), and the polymer mixture is extruded through a die (not shown), in a conventional screw section 18, into a zone of lower pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1724872A GB1410979A (en) | 1972-04-14 | 1972-04-14 | Process for the dispersion of blowing agents in thermoplastics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1724872A GB1410979A (en) | 1972-04-14 | 1972-04-14 | Process for the dispersion of blowing agents in thermoplastics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1410979A true GB1410979A (en) | 1975-10-22 |
Family
ID=10091882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1724872A Expired GB1410979A (en) | 1972-04-14 | 1972-04-14 | Process for the dispersion of blowing agents in thermoplastics |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1410979A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2460974A1 (en) * | 1980-04-28 | 1981-01-30 | Asahi Dow Ltd | PROCESS FOR THE PREPARATION OF A POLYOLEFIN RESIN FOAM |
| US5622663A (en) * | 1995-06-14 | 1997-04-22 | Dow Corning Corporation | Method for preparing a continuous foam profile containing a filamentary core |
| WO1997020887A1 (en) * | 1995-12-06 | 1997-06-12 | P.A.T.I. S.P.A. | A film for use as a covering in agriculture and a method for its manufacture |
| CN108621358A (en) * | 2018-06-19 | 2018-10-09 | 华南理工大学 | A kind of differential gas injection structures and methods |
| CN110128741A (en) * | 2018-02-09 | 2019-08-16 | 中国科学院宁波材料技术与工程研究所 | Foam polyolefin material and preparation method thereof |
| CN115157528A (en) * | 2022-07-21 | 2022-10-11 | 浙江谦达机电科技有限公司 | Foaming machine head and foaming machine applying same |
-
1972
- 1972-04-14 GB GB1724872A patent/GB1410979A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2460974A1 (en) * | 1980-04-28 | 1981-01-30 | Asahi Dow Ltd | PROCESS FOR THE PREPARATION OF A POLYOLEFIN RESIN FOAM |
| US5622663A (en) * | 1995-06-14 | 1997-04-22 | Dow Corning Corporation | Method for preparing a continuous foam profile containing a filamentary core |
| WO1997020887A1 (en) * | 1995-12-06 | 1997-06-12 | P.A.T.I. S.P.A. | A film for use as a covering in agriculture and a method for its manufacture |
| CN110128741A (en) * | 2018-02-09 | 2019-08-16 | 中国科学院宁波材料技术与工程研究所 | Foam polyolefin material and preparation method thereof |
| CN108621358A (en) * | 2018-06-19 | 2018-10-09 | 华南理工大学 | A kind of differential gas injection structures and methods |
| CN108621358B (en) * | 2018-06-19 | 2024-01-09 | 华南理工大学 | Differential gas injection structure and method |
| CN115157528A (en) * | 2022-07-21 | 2022-10-11 | 浙江谦达机电科技有限公司 | Foaming machine head and foaming machine applying same |
| CN115157528B (en) * | 2022-07-21 | 2024-03-05 | 浙江谦达机电科技有限公司 | Foaming machine head and foaming machine using same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |