EP0095670A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for producing aromatic polyester polycarbonate particles
Assignee: Mitsubishi Chemical Corp
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Filing: 1983-05-19
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Granted: —
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Expires: 2003-05-19
Abstract
Abstract A process for producing aromatic polyester polycarbonate particles from a methylene chloride solution of an aromatic polyester polycarbonate comprises continuously supplying the methylene chloride solution of an aromatic polyester polycarbonate to a particle-forming tank, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form aromatic polyester polycarbonate particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming tank and containing the aromatic polyester polycarbonate particles to wet pulverization treatment and recycling the treated slurry to the particle-forming tank.
Inventors
- 👤 Katsuhisa Kohyama
- 👤 Akira Matsuno
- 👤 Teruo Kidera
- 👤 Kenji Tsuruhara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 03:34
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J2369/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A process for producing aromatic polyester polycarbonate particles from a methylene chloride solution of an aromatic polyester polycarbonate, which comprises continuously supplying the methylene chloride solution of an aromatic polyester polycarbonate to a particle-forming tank, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form aromatic polyester polycarbonate particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming tank and containing the aromatic polyester polycarbonate particles to wet pulverization treatment and recycling the treated slurry to the particle-forming tank.
Claim 2
Dependent Claim
92 words
A process for producing aromatic polyester polycarbonate particles from a methylene chloride solution of an aromatic polyester polycarbonate, which comprises continuously supplying the methylene chloride solution of an aromatic polyester polycarbonate to a particle-forming tank, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form aromatic polyester polycarbonate particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming tank and containing the aromatic polyester polycarbonate particles to wet pulverization treatment and recycling the treated slurry to the particle-forming tank.
Claim 3
Dependent Claim
20 words
The process according to Claim 1 wherein the particle-forming tank is maintained at a temperature of from 40 to 95°C.
Claim 4
Dependent Claim
26 words
The process according to Claim 1 wherein the concentration of the aromatic polyester polycarbonate in the methylene chloride solution is from 3 to 35% by weight.
Claim 5
Dependent Claim
33 words
The process according to Claim 1 wherein the concentration of the aromatic polyester polycarbonate in the aqueous slurry in the particle-forming tank is from 5 to 30% by weight relative to the water.
Claim 6
Dependent Claim
35 words
The process according to Claim 1 wherein the amount of the aqueous slurry recycled to the particle-forming tank is from 10 to 99.5% by weight of the total aqueous slurry withdrawn from the particle-forming tank.
Claim 7
Dependent Claim
107 words
A process for producing aromatic polyester polycarbonate particles from a methylene chloride solution of an aromatic polyester polycarbonate, which comprises continuously mixing the methylene chloride solution of an aromatic polyester polycarbonate and water to form a mixture of an oil-in-water type suspension, continuously supplying the mixture to a particle-forming tank, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form aromatic polyester polycarbonate particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming tank and containing the aromatic polyester polycarbonate particles to wet pulverization treatment and recycling the treated slurry to the particle-forming tank.
Claim 8
Dependent Claim
107 words
A process for producing aromatic polyester polycarbonate particles from a methylene chloride solution of an aromatic polyester polycarbonate, which comprises continuously mixing the methylene chloride solution of an aromatic polyester polycarbonate and water to form a mixture of an oil-in-water type suspension, continuously supplying the mixture to a particle-forming tank, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form aromatic polyester polycarbonate particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming tank and containing the aromatic polyester polycarbonate particles to wet pulverization treatment and recycling the treated slurry to the particle-forming tank.
Claim 9
Dependent Claim
34 words
The process according to Claim 6 wherein the volume ratio of the methylene chloride solution of an aromatic polyester polycarbonate to water in the mixture of an oil-in-water type suspension is 1 : 0.1-4.
Claim 10
Dependent Claim
24 words
The process according to Claim 6 wherein the methylene chloride solution of an aromatic polyester polycarbonate and water are mixed in an agitation tank.
Claim 11
Dependent Claim
20 words
The process according to Claim 6 wherein the particle-forming tank is maintained at a temperature of from 40 to 95°C.
Claim 12
Dependent Claim
26 words
The process according to Claim 6 wherein the concentration of the aromatic polyester polycarbonate in the methylene chloride solution is from 3 to 35% by weight.
Claim 13
Dependent Claim
33 words
The process according to Claim 6 wherein the concentration of the aromatic polyester polycarbonate in the aqueous slurry in the particle-forming tank is from 5 to 30% by weight relative to the water.
Claim 14
Dependent Claim
35 words
The process according to Claim 6 wherein the amount of the aqueous slurry recycled to the particle-forming tank is from 10 to 99.5% by weight of the total aqueous slurry withdrawn from the particle-forming tank.
References Cited (Backward Citations)
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