Patent EP0172427A2 successfully refreshed from Google Patents.
EP0172427A2
Expired / Lapsed
EP
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Process for production of vinyl chloride polymer
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1985-07-22
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Granted: —
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Expires: 2005-07-22
Abstract
Abstract This process is a process for production of a vinyl chloride polymer by suspension polymerization or emulsion polymerization of vinyl chloride monomer or a mixture of vinyl chloride monomer with a vinyl monomer copolymerizable with said vinyl chloride monomer in an aqueous medium, characterized in that the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated π bonds, while controlling the chloride ion concentration in the reaction mixture to not higher than 100 ppm. According to said process, scaling onto the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.
Inventors
- 👤 Shunichi Koyanagi
- 👤 Hajime Kitamura
- 👤 Toshihide Shimizu
- 👤 Ichiro Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:38
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/002; C08F2/004
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
115 words
A process for production of a vinyl chloride polymer by suspension polymerization or emulsion polymerization of vinyl chloride monomer or a mixture of vinyl chloride monomer with a vinyl monomer copolymerizable with said vinyl chloride monomer in an aqueous medium, characterized in that the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated Π bonds, while controlling the chloride ion concentration in the reaction mixture to not higher than 100 ppm.
Claim 2
Dependent Claim
115 words
A process for production of a vinyl chloride polymer by suspension polymerization or emulsion polymerization of vinyl chloride monomer or a mixture of vinyl chloride monomer with a vinyl monomer copolymerizable with said vinyl chloride monomer in an aqueous medium, characterized in that the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated Π bonds, while controlling the chloride ion concentration in the reaction mixture to not higher than 100 ppm.
Claim 3
Dependent Claim
18 words
A process according to Claim 1, wherein said scaling preventive contains at least one of dyes and pigments.
Claim 4
Dependent Claim
63 words
A process according to Claim 2, wherein said scaling preventive comprises at least one selected from azo dyes and pigments, anthraquinone dyes and pigments, indigoid dyes and pigments, phthalocyanine dyes and pigments, carbonium dyes and pigments, quinoneimine dyes, methine dyes, quinoline dyes, nitro dyes, benzoquinone and naphthoquinone dyes, naphthalimide dyes and pigments, perinone dyes, sulfide dyes, fluorescent dyes, azoic dyes and reactive dyes.
Claim 5
Dependent Claim
14 words
A process according to Claim 3, wherein said scaling preventive comprises an azine dye.
Claim 6
Dependent Claim
23 words
A process according to Claim 1, wherein said scaling preventive comprises an aromatic or heterocyclic compound having at least 5 conjugated π bonds.
Claim 7
Dependent Claim
27 words
A process according to Claim 5, wherein the aromatic or heterocyclic compound having at least 5 conjugated π bonds is one having at least one amino group.
Claim 8
Dependent Claim
51 words
A process according to Claim 6, the compound having at least one amino group is selected from aminonaphthalenes such as diaminonaphthalenes, triaminonaphthalenes and tetraaminonaphthalenes, 1,4-diaminoanthracens, 9,10-diaminophenanthrene, 2,2'-diaminodiphenyl, 1,1'-diamino-2,2'-dinaphthyl, 2-amino-5-phenyl oxazole, 1-aminophenanthridine, 2-amino-4-phenylthiazole, 2-amino-5-phenylthiazole, 3-amino-1,5-naphtyl, 1-aminophenanthridine, aminoacridines such as 4-aminoacridine, 2-aminoacridine, 1-aminoacridine and 3,6-diaminoacridine, and aminophenazines such as 1-aminophenazine, 2-aminophenazine and 2,3-diaminophenazine.
Claim 9
Dependent Claim
15 words
A process according to Claim 1, wherein said scaling preventive further comprises an inorganic compound.
Claim 10
Dependent Claim
49 words
A process according to Claim 8, wherein said inorganic compound is selected from silicic acids, silicates; salts of alkaline earth metals, zinc family metals, aluminum family metals, tin family metals, iron family metals, chromium family metals, manganese family metals, copper family metals and platinum family metals; and inorganic colloids.
Claim 11
Dependent Claim
20 words
A process according to Claim 9, wherein said inorganic compound is a silicate, silicic acid colloid or ferric hydroxide colloid.
Claim 12
Dependent Claim
18 words
A process according to Claim 8, wherein said scaling preventive contains at least one of dyes and pigments.
Claim 13
Dependent Claim
64 words
1 2. A process according to Claim 8, wherein said scaling preventive comprises at least one selected from azo and pigments, anthraquinone dyes and pigments, indigo dyes and pigments, phthalocyanine dyes and pigments, carbonium dyes and pigments, quinoneimine dyes, methine dyes, quinoline dyes, nitro dyes, benzoquinone and naphthoquinone dyes, naphthalimide dyes and pigments, perinone dyes, sulfide dyes, fluorescent dyes, azoic dyes and reactive dyes.
Claim 14
Dependent Claim
14 words
A process according to Claim 12, wherein said scaling preventive comprises an azine dye.
Claim 15
Dependent Claim
23 words
A process according to Claim 8, wherein said scaling preventive comprises an aromatic or heterocyclic compound having at least 5 conjugated π bonds.
Claim 16
Dependent Claim
27 words
A process according to Claim 14, wherein the aromatic or heterocyclic compound having at least 5 conjugated π bonds is one having at least one amino group.
Claim 17
Dependent Claim
51 words
A process according to Claim 15, the compound having at least one amino group is selected from aminonaphthalenes such as diaminonaphthalenes, triaminonaphthalenes and tetraaminonaphthalenes, 1,4-diaminoanthracens, 9,10-diaminophenanthrene, 2,2'-diaminodiphenyl, 1,1'-diamino-2,2'-dinaphthyl, 2-amino-5-phenyl oxazole, 1-aminophenanthridine, 2-amino-4-phenylthiazole, 2-amino-5-phenylthiazole, 3-amino-l,5-naphtyl, 1-aminophenanthridine, aminoacridines such as 4-aminoacridine, 2-aminoacridine, 1-aminoacridine and 3,6-diaminoacridine, and aminophenazines such as 1-aminophenazine, 2-aminophenazine and 2,3-diaminophenazine.
Claim 18
Dependent Claim
22 words
A process according to Claim 1, wherein a fixing agent is used for enchancement of the fixing characteristic of said scaling preventive.
Claim 19
Dependent Claim
64 words
A process according to Claim 17, wherein said fixing agent is at least one selected from olefin polymers, diene polymers, acetylene polymers, aliphatic vinyl or vinylidene polymers, aromatic vinyl polymers, heterocyclic vinyl polymers, acrylic or methacrylic polymers, polyethers, polysulfides, polysulfones, addition polymers, polyesters, polyamides, polyureas, polyurethanes, linear condensed polymers, heterocyclic condensed polymers, natural polymers, modified natural polymers, polysiloxanes, organic metal polymers and inorganic polymers.
Claim 20
Dependent Claim
28 words
A process according to Claim 1, wherein the portions of recovery system of unreacted monomers where scales may be sticked are further previously coated with the scaling preventive.
Claim 21
Dependent Claim
37 words
A process according to Claim 1, wherein the inner wall surface and the portions of the auxiliary equipment of polymerizer which may come into contact with the monomer have a surface roughness of 10 µm or less.
References Cited (Backward Citations)
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