Patent US4189451A successfully refreshed from Google Patents.
US4189451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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
•
Filing: 1978-05-25
•
Granted: 1980-02-19
•
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 18:13
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.
References Cited (Backward Citations)
US3112320A
Cited
US3234194A
Cited
US3362942A
Cited
USRE27093E
Cited
US3484419A
Cited
US3534122A
Cited
US3639370A
Cited
US3775364A
Cited
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 |