US4016341A
Expired / Lapsed
US
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Bulk polymerization of vinyl chloride
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1975-10-23
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Granted: 1977-04-05
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Expires: 1995-10-23
Abstract
Abstract Vinyl chloride monomer, or a mixture thereof with a copolymerizable monomer or monomers, is bulkpolymerized so that the deposition of polymer scale on the inner walls of the polymerization vessel and other surfaces in contact with the monomer or monomers can be greatly reduced by coating them with phosphoric esters, polyphosphoric esters or their alkali metal salts before the polymerization is commenced. Clean-up operations following each polymerization run are much simplified.
Inventors
- 👤 Kinya Ogawa
- 👤 Kazuhiko Kurimoto
- 👤 Yoshitsugu Eguchi
- 👤 Satoshi Kuwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:32
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/002; C08F2/004
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
72 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters, and their alkali metal salts thereof.
Claim 2
Dependent Claim
72 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters, and their alkali metal salts thereof.
Claim 3
Dependent Claim
21 words
The method as claimed in claim 1 wherein said phosphoric ester is an ester of phosphoric acid with a monovalent alcohol.
Claim 4
Dependent Claim
14 words
The method as claimed in claim 1 wherein said phosphoric ester is trimethyl phosphate.
Claim 5
Dependent Claim
15 words
The method as claimed in claim 1 wherein said phosphoric ester is polyoxyethylene monolauryl phosphate.
Claim 6
Dependent Claim
27 words
The method as claimed in claim 1 wherein said phosphoric ester is selected from the group consisting of glucose-1-phosphoric acid, glucose-6-phosphoric acid, D-fructose-6-phosphoric acid and phytic acid.
Claim 7
Dependent Claim
21 words
The method as claimed in claim 1 wherein said phosphoric ester is an ester of phosphoric acid with a polyvalent alcohol.
Claim 8
Dependent Claim
28 words
The method as claimed in claim 6 wherein said polyvalent alcohol is selected from the group consisting of ethyleneglycol, glycerine, 1,4-sorbitan, 1,4,3,6-sorbide, sorbitol, mannitol and polyoxyethylene adducts thereof.
Claim 9
Dependent Claim
21 words
The method as claimed in claim 1 wherein said polyphosphoric ester is an ester of polyphosphoric acid with a polyvalent alcohol.
Claim 10
Dependent Claim
29 words
The method as claimed in claim 8 wherein said polyphosphoric acid is selected from the group consisting of pyrophosphoric acid, triphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid and hexametaphosphoric acid.
Claim 11
Dependent Claim
24 words
The method as claimed in claim 1 wherein said alkali metal salt is selected from the group consisting of lithium, sodium and potassium salts.
Claim 12
Dependent Claim
25 words
The method as claimed in claim 1 wherein the amount of said phosphoric compound is from 0.0001 to 500 g per m 2 of coating.
Claim 13
Dependent Claim
25 words
The method as claimed in claim 1 wherein the amount of said phosphoric compound is from 0.05 to 10 g per m 2 of coating.
Claim 14
Dependent Claim
23 words
The method as claimed in claim 1 wherein said phosphoric compound is dissolved in a solvent prior to coating and dried after coating.
Claim 15
Dependent Claim
16 words
The method as claimed in claim 1 wherein said phosphoric compound has substantial solubility in water.
Claim 16
Dependent Claim
80 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of a mixture of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters and their alkali metal salts thereof and at least one borate.
Claim 17
Dependent Claim
80 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of a mixture of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters and their alkali metal salts thereof and at least one borate.
Claim 18
Dependent Claim
27 words
The method as claimed in claim 15 wherein said borate is selected from the group consisting of alkali metal borates, alkali earth metal borates and ammonium borate.
Claim 19
Dependent Claim
29 words
The method as claimed in claim 15 wherein the amount of said borate is from 0.1 to 10 parts by weight per part by weight of said phosphoric compound.
Claim 20
Dependent Claim
24 words
The method as claimed in claim 15 wherein the amount of said mixture is from 0.0001 to 500 g per m 2 of coating.
Claim 21
Dependent Claim
24 words
The method as claimed in claim 15 wherein the amount of said mixture is from 0.05 to 10 g per m 2 of coating.
Claim 22
Dependent Claim
81 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of a mixture of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters and their alkali metal salts thereof and at least one polymerization inhibitor.
Claim 23
Dependent Claim
81 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of a mixture of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters and their alkali metal salts thereof and at least one polymerization inhibitor.
Claim 24
Dependent Claim
31 words
The method as claimed in claim 20 wherein said polymerization inhibitor is selected from the group consisting of diphenylamine, hydroquinone, naphthoquinone, cumylphenols, pyrocatechol, bisphenol A, 2-vinylpyridine, α-methylstyrene, cinnamic aldehyde and crotonaldehyde.
Claim 25
Dependent Claim
29 words
The method as claimed in claim 20 wherein the amount of said polymerization inhibitor is 0.1 to 10 parts by weight per part by weight of said phosphoric compound.
Claim 26
Dependent Claim
24 words
The method as claimed in claim 20 wherein the amount of said mixture is from 0.0001 to 500 g per m 2 of coating.
Claim 27
Dependent Claim
24 words
The method as claimed in claim 20 wherein the amount of said mixture is from 0.05 to 10 g per m 2 of coating.
Claim 28
Dependent Claim
85 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of a mixture of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters and their alkali metal salts thereof, at least one borate and at least one polymerization inhibitor.
Claim 29
Dependent Claim
85 words
In a method for the bulk polymerization of vinyl chloride monomer or a mixture thereof with a copolymerizable monomer or monomers, the improvement which comprises coating the walls of a polymerization vessel and other surfaces coming into contact with the monomer or monomers, prior to the polymerization, with a solution of a mixture of at least one phosphoric compound selected from the group consisting of phosphoric esters, polyphosphoric esters and their alkali metal salts thereof, at least one borate and at least one polymerization inhibitor.
Claim 30
Dependent Claim
25 words
The method as claimed in claim 25 wherein the amount of the said mixture is from 0.0001 to 500 g per m 2 of coating.
Claim 31
Dependent Claim
24 words
The method as claimed in claim 25 wherein the amount of said mixture is from 0.05 to 10 g per m 2 of coating.
References Cited (Backward Citations)
US2380552A
Cited
US3778423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |