US4320215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of vinyl chloride with phenolic compounds
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1979-11-07
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Granted: 1982-03-16
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Expires: 1999-11-07
Abstract
Abstract A method of preventing scale formation and adhesion onto the surfaces of a polymerization vessel and auxilliary equipment used in polymerization of vinyl chloride monomer, wherein the surfaces are coated prior to polymerization with a coating agent having the concurrent properties of (a) one or more functional groups having the ability to chelate, (b) one or more functional groups having the ability to inhibit action of free radicals, and (c) substantial insolubility to vinyl chloride monomer and insoluble to water. The concurrent presences of these functional characteristics syngergistically act to prevent scale adhesion onto the surfaces after substantial numbers of repeated polymerization charges.
Inventors
- 👤 Kazuya Yonezawa
- 👤 Tadashi Osawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:42
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/002; C08F2/004
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A method of polymerizing vinyl chloride or a mixture of monomers comprising a major proportion of vinyl chloride with a minor proportion of other monomers copolymerizable therewith, in a polymerization vessel having accessories; wherein prior to polymerization, the surfaces of said polymerization vessel and accessories are coated with a compound consisting essentially of a condensation product of a phenolic compound having two or three OH groups, at least two of said OH groups located on adjacent carbon atoms of aromatic nucleus with an aromatic aldehyde; and wherein said phenolic compound is selected from the group consisting of pyrogallol, hydroxyhydroquinone, and mixtures thereof.
Claim 2
Independent Claim
102 words
A method of polymerizing vinyl chloride or a mixture of monomers comprising a major proportion of vinyl chloride with a minor proportion of other monomers copolymerizable therewith, in a polymerization vessel having accessories; wherein prior to polymerization, the surfaces of said polymerization vessel and accessories are coated with a compound consisting essentially of a condensation product of a phenolic compound having two or three OH groups, at least two of said OH groups located on adjacent carbon atoms of aromatic nucleus with an aromatic aldehyde; and wherein said phenolic compound is selected from the group consisting of pyrogallol, hydroxyhydroquinone, and mixtures thereof.
Claim 3
Dependent Claim
41 words
The method of claim 1, wherein said other monomers are selected from the group consisting of vinyl acetate, vinyl propionate, methyl vinyl ether, methyl acrylate, butyl acrylate, methyl methacrylate, maleic acid, fumaric acid, ethylene, propylene, vinylidene chloride, vinyl fluoride and acrylonitrile.
Claim 4
Dependent Claim
12 words
The method of claim 1, wherein the polymerization is by suspension polymerization.
Claim 5
Dependent Claim
12 words
The method of claim 1, wherein the polymerization is by emulsion polymerization.
Claim 6
Dependent Claim
12 words
The method of claim 1, wherein the polymerization is by bulk polymerization.
Claim 7
Dependent Claim
28 words
The method of claim 1, wherein said coating compound is dissolved in a solvent, diluted with a diluent or suspended in water prior to application to said surface.
Claim 8
Dependent Claim
23 words
The method of claim 1, wherein said coating compound is applied in amounts ranging from 0.001 g/m 2 to 5 g/m 2 .
Claim 9
Dependent Claim
29 words
The method of claim 1, wherein said aromatic aldehyde is a member selected from the group consisting of aryl and aralkyl aldehyde having from 7 to 18 carbon atoms.
Claim 10
Dependent Claim
11 words
The method of claim 8, wherein said aromatic aldehyde is benzaldehyde.
Claim 11
Dependent Claim
48 words
The method of claim 1, wherein said compound is produced by a condensation reaction of (A) a phenolic compound having two or three OH groups on adjacent carbon atoms of aromatic nucleus and (B) aryl or substituted aryl compound having 6 to 18 carbon atoms with aromatic aldehyde.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |