Patent EP0340655A2 successfully refreshed from Google Patents.
EP0340655A2
Expired / Lapsed
EP
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Compositions comprising thermally incompatible polymers
Assignee: Himont Italia SpA
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Filing: 1989-05-02
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Granted: —
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Expires: 2009-05-02
Abstract
Abstract Process for the preparation of mixtures of thermally incompatible polymers, said process comprising: a) feeding into a first extruder (1) a thermoplastic polymer possessing relatively low processing temperatures; b) feeding into at least one second extruder (5) at least one thermoplastic polymer possessing relatively high processing temperatures; and c) feeding the molten polymer of the second extruder (5) into the first extruder (1) at a point near its outlet (4). l
Inventors
- 👤 Carlo Federici
- 👤 Giancarlo Attalla
- 👤 Lawrence Ph.D.L. Chapoy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:50
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/49; B29B; B29B7/00; B29B7/002; B29B7/30; B29B7/34; B29B7/38; B29B7/46; B29B7/48; B29B7/488; B29B7/74; B29B7/7466; B29C48/022; B29C48/023; C; C08; C08L; C08L101/00; B29B7/40; B29B7/80; B29B7/82; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29C48/09; C08L2205/00; C08L2205/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
A process for the preparation of a thermoplastic composition comprising a thermoplastic polymer A and a thermoplastic polymer B, said polymer B having a processability temperature higher than that of the polymer A, the difference between the lower limit of the processability temperature range of polymer B and the upper limit of the processability temperature range of polymer A being of at least 5°C, said process comprising the combination of: a) feeding the polymer A into a first extruder and processing said polymer A in said first extruder thus melting said polymer A; b) feeding the polymer B into a second extruder and processing said polymer B in said second extruder thus melting said polymer B; and c) feeding the molten polymer B obtained from step b) into said first extruder in a position close to the outlet thereof.
Claim 2
Dependent Claim
139 words
A process for the preparation of a thermoplastic composition comprising a thermoplastic polymer A and a thermoplastic polymer B, said polymer B having a processability temperature higher than that of the polymer A, the difference between the lower limit of the processability temperature range of polymer B and the upper limit of the processability temperature range of polymer A being of at least 5°C, said process comprising the combination of: a) feeding the polymer A into a first extruder and processing said polymer A in said first extruder thus melting said polymer A; b) feeding the polymer B into a second extruder and processing said polymer B in said second extruder thus melting said polymer B; and c) feeding the molten polymer B obtained from step b) into said first extruder in a position close to the outlet thereof.
Claim 3
Dependent Claim
37 words
The process of claim 1, wherein the difference between the lower limit of the processability temperature range of polymer B and the upper limit of the processability temperature range of polymer A is of at least 10°C.
Claim 4
Dependent Claim
37 words
The process of claim 1, wherein the difference between the lower limit of the processability temperature range of polymer B and the upper limit of the processability temperature range of polymer A is from 20°C to 100°C.
Claim 5
Dependent Claim
62 words
The process of claim 1 whrein the polymer A has processability temperatures from 100°C to 280°C and is selected from the group consisting of (co)polymers of olefins having general formula CH₂=CHR, wherein R is H or a C₁-C₆ alkyl radical; polystyrene; polystyrene modified with polar monomers; vinyl resins; ABS (acrylonitrilebutadiene-styrene) resins; AES (acrylonitrile-EPDM-styrene) resins; polyamides; acrylic and/or methacrylic resins and low-molecular-weight polycarbonates.
Claim 6
Dependent Claim
38 words
The process of claim 1 wherein the polymer B has a processability temperature of greater than 200°C and is selected from the group consisting of polycarbonates; polyphenyleneoxides; polyphenylene sulphides; polysulphones; polyetherimides; polyamideimides; polyetheroketones; polyetheroetheric ketones and polyester resins.
Claim 7
Dependent Claim
14 words
The process of claim 1, wherein the polymer B is a thermotropic liquid-crystalline polymer.
Claim 8
Dependent Claim
37 words
The process of claim 6, wherein the thermotropic liquid-crystalline polymer is a polyester obtained from a polycondensation reaction of aromatic and/or cycloaliphatic bicarboxylic acids with diphenols and/or with cycloaliphatic diols, possibly in admixture with aromatic hydroxy acids.
Claim 9
Dependent Claim
18 words
The process of claim 6, wherein the thermotropic liquid-crystalline polymer has a processability temperature of greater than 250°C.
Claim 10
Dependent Claim
28 words
The process of claim 1, wherein the thermoplastic polymer B is fed from the second extruder into the first extruder through a connecting junction provided with heating means.
Claim 11
Dependent Claim
35 words
The process of claim 1, wherein the introduction of the molten thermoplastic polymer B into the first extruder occurs at a distance from the outlet of this latter of from 1 to 15 screw diameters.
Claim 12
Dependent Claim
88 words
A thermoplastic composition comprising 1 to 99% by weight of a thermoplastic polymer A and 99% to 1% by weight of a thermoplastic polymer B, said polymer B having a processability temperature higher than that of the polymer A, the difference between the lower limit of the processability temperature range of polymer B and the upper limit of the pocessability temperature range of the polymer A being of at least 5°C, said thermoplastic composition being obtainable by the process of one or more of claims 1 to 10.
Claim 13
Dependent Claim
54 words
The thermoplastic composition of claim 11 consisting of a self-reinforced composite, in which the polymer B is a thermotropic liquid-crystalline polymer dispersed as reinforcing component in a matrix of the polymer A, said polymer B being in the form of continuous stretched fibres having an essentially unidirectional orientation in the sense of the extrusion.
Claim 14
Dependent Claim
119 words
An apparatus for carrying out the process as claimed in one or more of claims 1 to 10 or for preparing the thermoplastic composition as claimed in claim 11 or 12, said apparatus comprising a combination of: (1) a first extruder (1) for processing and melting said polymer A; (2) means (2, 3) for feeding said polymer A into said first extruder (1); (3) a second extruder (5) for processing and melting said polymer B; (4) means (6, 7) for feeding said polymer B into said second extruder (5); (5) means (8, 9) for feeding the molten polymer B coming from said second extruder (5) into said first extruder (1) in a position close to the outlet (4) thereof.
References Cited (Backward Citations)
No citation records indexed.
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