US4189451A
Expired / Lapsed
US
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Process and 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: 1980-02-19
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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 14:21
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; C08F4/00; C08F4/40; C08K; C08K5/00; C08K5/04; C08K5/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/31645; Y10T428/31649; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31703; Y10T428/31786; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
An improved process for preparing a cured polymeric article which includes curing a syrup consisting essentially of 10-40% by weight of methyl methacrylate polymer, having an inherent viscosity of 0.25-1.0, in monomeric methyl methacrylate, said polymer being selected from the group consisting of methyl methacrylate homopolymer and copolymers of methyl methacrylate with α,β-ethylenically unsaturated compounds, in the presence of a small amount of a metal salt of a 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 wherein the improvement comprises the presence of a salt of an oxo acid of sulfur activator selected from the group consisting of bisulfite, metabisulfite and thiosulfate salts.
Claim 2
Dependent Claim
150 words
An improved process for preparing a cured polymeric article which includes curing a syrup consisting essentially of 10-40% by weight of methyl methacrylate polymer, having an inherent viscosity of 0.25-1.0, in monomeric methyl methacrylate, said polymer being selected from the group consisting of methyl methacrylate homopolymer and copolymers of methyl methacrylate with α,β-ethylenically unsaturated compounds, in the presence of a small amount of a metal salt of a 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 wherein the improvement comprises the presence of a salt of an oxo acid of sulfur activator selected from the group consisting of bisulfite, metabisulfite and thiosulfate salts.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein said salt of an oxo acid of sulfur activator is present in a ratio to said salt of hemi-perester of maleic acid of from approximately 1:7 to approximately 4:1 by weight.
Claim 4
Dependent Claim
140 words
An improved mixture for preparing polymeric articles consisting essentially of a syrup containing 10-40% by weight of methyl methacrylate polymer, having an inherent viscosity of 0.25-1.0, in monomeric methyl methacrylate, said polymer being selected from the group consisting of methyl methacrylate homopolymer and copolymers of methyl methacrylate with α,β-ethylenically unsaturated compounds, and a small amount of a hemi-perester of maleic acid having the formula ##STR4## 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 of from 1 to the valence of the metal; and R is a saturated tertiary alkyl radical wherein the improvement comprises the presence of a salt of an oxo acid of sulfur activator selected from the group consisting of bisulfite, metabisulfite and thiosulfate salts.
Claim 5
Dependent Claim
140 words
An improved mixture for preparing polymeric articles consisting essentially of a syrup containing 10-40% by weight of methyl methacrylate polymer, having an inherent viscosity of 0.25-1.0, in monomeric methyl methacrylate, said polymer being selected from the group consisting of methyl methacrylate homopolymer and copolymers of methyl methacrylate with α,β-ethylenically unsaturated compounds, and a small amount of a hemi-perester of maleic acid having the formula ##STR4## 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 of from 1 to the valence of the metal; and R is a saturated tertiary alkyl radical wherein the improvement comprises the presence of a salt of an oxo acid of sulfur activator selected from the group consisting of bisulfite, metabisulfite and thiosulfate salts.
Claim 6
Dependent Claim
37 words
The mixture of claim 3 wherein said salt of an oxo acid of sulfur activator is present in a ratio to said salt of hemi-perester of maleic acid of from approximately 1:7 to approximately 4:1 by weight.
Claim 7
Dependent Claim
18 words
The mixture of claim 3 wherein said activator is an aqueous solution of sodium bisulfite or sodium metabisulfite.
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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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |