GB1298287A - Method of producing shaped articles of thermoplastic resins - Google Patents
Method of producing shaped articles of thermoplastic resinsInfo
- Publication number
- GB1298287A GB1298287A GB5878970A GB5878970A GB1298287A GB 1298287 A GB1298287 A GB 1298287A GB 5878970 A GB5878970 A GB 5878970A GB 5878970 A GB5878970 A GB 5878970A GB 1298287 A GB1298287 A GB 1298287A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- heat capacity
- outer layer
- blowing agent
- mould
- 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
- C08J9/34—Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core
-
- 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
- B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/0423—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by density separation
- B29C44/043—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by density separation using a rotating mould
-
- 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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
- B29C67/207—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising impregnating expanded particles or fragments with a binder
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating 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)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
1298287 Moulding foamed thermoplastic articles SEKISUI KAGAKU KOGYO KK 10 Dec 1970 [11 Dec 1969] 58789/70 Heading B5A In a method of making a shaped thermoplastic article having a foamed core and an unfoamed outer layer, particles of (a) a thermoplastic resin containing a solid thermally decomposable blowing agent and (b) a thermoplastic resin not containing such a blowing agent and having a lower heat capacity than particles (a), are introduced into a mould, and the mould heated and rotated; the particles (b), since they have a lower heat capacity than the particles (a), melt first and adhere to the mould surface as it rotates to form the unfoamed outer layer, while on further heating the particles (b) melt and the blowing agent contained therein decomposes to form the foamed core of the article. Preferably the ratio of the heat capacity of particles (a) to the heat capacity of particles (b) is greater than 50 and less than 1000. The difference in heat capacities is effected either by using different resins for the outer layer and core, or by using the same resin throughout, the particles (a) being in this case larger than the particles (b). Examples are described involving polystyrene, polyethylene, polypropylene, polyvinylchloride, methacrylic resin, acrylonitrilebutadiene - styrene copolymer, acrylonitrile - styrene copolymer and polycarbonate resins. Blowing agents mentioned are dinitropentamethylene tetramine, dimethyldinitrosoterephthalazide, benzene sulphonyl hydrazide, toluenesulphonylhydrazide, azobisisobutyronitrile, diazoaminobenzene, trihydrazinetriazine, paratoluenesulphonylsemicarbazide, oxybisbenzenesulphonylsemicarbazide and azodicarbonamide. The particles (a) may have a lower melting point and a higher density than particles (b).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9986069 | 1969-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1298287A true GB1298287A (en) | 1972-11-29 |
Family
ID=14258540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5878970A Expired GB1298287A (en) | 1969-12-11 | 1970-12-10 | Method of producing shaped articles of thermoplastic resins |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1298287A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111057294A (en) * | 2018-10-16 | 2020-04-24 | 中国石油化工股份有限公司 | Light-storage foaming type polyethylene floating ball composition and preparation method thereof |
-
1970
- 1970-12-10 GB GB5878970A patent/GB1298287A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111057294A (en) * | 2018-10-16 | 2020-04-24 | 中国石油化工股份有限公司 | Light-storage foaming type polyethylene floating ball composition and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2061112A1 (en) | 1971-07-22 |
| DE2061112B2 (en) | 1975-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |