Patent US4197215A successfully refreshed from Google Patents.
US4197215A
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Composition for polymerizing and curing methyl methacrylate monomer-polymer syrups in the presence of metal salts of hemi-peresters of maleic acid
Assignee: EIDP Inc
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Filing: 1978-05-25
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Granted: 1980-04-08
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Expires: 1998-05-25
Abstract
Abstract In the use of certain metal salts of the hemi-perester of maleic acid as catalysts for the polymerization and curing of ethylenically unsaturated monomers and of methyl methacrylate-containing syrups the addition of an activator such as sodium bisulfite provides a substantial reduction in the curing time. The process is relatively insensitive to the amount of filler used. The salts of maleic hemi-peresters, in combination with the activators, are also useful for polymerizing ethylenically unsaturated monomers.
Inventors
- 👤 Ronald S. Dudinyak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:41
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; C08F4/00; C08F4/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
An initiator system for ethylenically unsaturated monomers consisting essentially of (A) a metal salt of hemi-perester of maleic acid having the formula ##STR3## wherein Me is a metal selected from the group consisting of Group IA metals, Group IIA metals, zinc, lead, cobalt, nickel, manganese and copper; x is an integer having a value from 1 to the valence of the metal; and R is a saturated tertiary alkyl radical; (B) an activator which is a salt of an oxo acid of sulfur selected from the group consisting of bisulfite, metabisulfite and thiosulfate salts or the free acid, said activator salt having a cation selected from the group consisting of Group IA metals, Group IIA metals, and ammonium, and said activator being present in a weight ratio to said metal salt of hemi-perester of maleic acid of from approximately 1:7 to 4:1; and (c) a polar liquid.
Claim 2
Dependent Claim
147 words
An initiator system for ethylenically unsaturated monomers consisting essentially of (A) a metal salt of hemi-perester of maleic acid having the formula ##STR3## wherein Me is a metal selected from the group consisting of Group IA metals, Group IIA metals, zinc, lead, cobalt, nickel, manganese and copper; x is an integer having a value from 1 to the valence of the metal; and R is a saturated tertiary alkyl radical; (B) an activator which is a salt of an oxo acid of sulfur selected from the group consisting of bisulfite, metabisulfite and thiosulfate salts or the free acid, said activator salt having a cation selected from the group consisting of Group IA metals, Group IIA metals, and ammonium, and said activator being present in a weight ratio to said metal salt of hemi-perester of maleic acid of from approximately 1:7 to 4:1; and (c) a polar liquid.
Claim 3
Dependent Claim
14 words
The initiator system of claim 1 wherein said cation is sodium, potassium, or calcium.
Claim 4
Dependent Claim
14 words
The initiator system of claim 1 or 2 wherein said polar liquid is water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |