CA1077183A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Mixing particulate additives into thermoplastics polymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-01-30
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Granted: 1980-05-06
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Expires: 1996-01-30
Abstract
Abstract ABSTRACT OF THE DISCLOSURE: Particulate additives such as carbon black and thermoplastics in a powdered form are mixed by first charging them to a rotary blade mixer and then charging the mixture obtained to an internal mixer. In this way the mixing cycle Or the internal mixer is drastically shortened with no adverse effect on the quality of the blend obtained. The process also permits a wider range of polymers to be mixed in an internal mixer and avoids the generation of steam and consequent loss of additive normally associated with carton black mixing operations carried out in Banbury mixers.
Inventors
- 👤 Hubert Lawes
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-10-23 20:57
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/80; B29B7/88; B29B7/885; C; C08; C08J; C08J3/00; C08J3/20; C08J3/203
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A method for mixing carbon black into a thermo-plastics polymer selected from low density polyethylene and copolymers of ethylene with acrylic or methacrylic acid or their methyl, ethyl or butyl esters or vinyl acetate,said poly-mer having been made by a process which produces polymer in a molten state, the method comprising (a) subjecting the polymer in the form of a powder 95% by weight of which is capable of passing through a 2,000 µm sieve and the carbon black to the mixing action of a rotary blade mixer in which the blades are rotating at a speed sufficient to fluidise the mixture and then (b) subjecting the mixture produced in the rotary blade mixer to the further mixing action of an internal mixer.
Claim 2
Independent Claim
123 words
A method for mixing carbon black into a thermo-plastics polymer selected from low density polyethylene and copolymers of ethylene with acrylic or methacrylic acid or their methyl, ethyl or butyl esters or vinyl acetate,said poly-mer having been made by a process which produces polymer in a molten state, the method comprising (a) subjecting the polymer in the form of a powder 95% by weight of which is capable of passing through a 2,000 µm sieve and the carbon black to the mixing action of a rotary blade mixer in which the blades are rotating at a speed sufficient to fluidise the mixture and then (b) subjecting the mixture produced in the rotary blade mixer to the further mixing action of an internal mixer.
Claim 3
Dependent Claim
14 words
A method as claimed in Claim 1 wherein the poly-mer is low density polyethylene.
Claim 4
Dependent Claim
36 words
A method according to Claim 1 wherein the blades of the rotary blade mixer are rotating such that the sum of the linear speeds of the tips of the blades is not less than 1,000 cm/second.
Claim 5
Dependent Claim
24 words
A method according to Claim 3 wherein the sum of the linear speeds of the tips lies in the range 4,000 to 40,000 cm/second.
Claim 6
Dependent Claim
26 words
A method according to Claim 1, 2 or 3 wherein 99% by weight of the polymer powder is capable of passing through a 1,2000 µm sieve.
References Cited (Backward Citations)
No citation records indexed.
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