US3058940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of water-soluble polyethylene glycol copolymers in aqueous medium
Assignee: Shawinigan Chemicals Ltd
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Filing: 1959-05-22
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Granted: 1962-10-16
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Expires: 1979-05-22
Abstract
No abstract record available.
Inventors
- 👤 Richard W Rees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:59
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR THE PREPARATION OF A COPOLYMER OF (A) A POLYETHYLENE GLYCOL, AND (B) A MONOMERIC LIQUID COPOLYMERIZABLE WITH THE POLYETHYLENE GLYCOL, SAID LIQUID BEING SELECTED FROM THE GROUP CONSISTING OF (A) VINYL ESTERS OF ALKANOIC ACIDS HAVING FOUR TO TEN CARBON ATOMS IN THE ESTER, (B) ALKYL ESTES OF ACRYLIC AND METHACRYLIC ACIDS HAVING ONE TO EIGHT CARBON ATOMS IN THE ALKYL RADICAL, AND (C) MIXTURES OF THE SAID VINYL AND ALKYL ESTERS, WHICH COMPRISES (1) AGITATING AT POLYMERIZATION TEMPERATURE IN THE RANGE BETWEEN 20% C. AND REFLUX TEMPERATURE A SYSTEM CONSISTING ESSENTIALLY OF: (I) WATER, (II) THE POLYETHYLENE GLYCOL, (III) THE COPOLYMERIZABLE LIQUID AND (IV) A WATER-SOLUBLE POLYMERIZATION CATALYST FOR THE COPOLYMERIZABLE LIQUID OF THE GROUP CONSISTING OF WATERSOLUBLE FREE RADICAL CATALYST AND WATER-SOLUBLE REDUCTIONACTIVATED CATALYST SYSTEMS, AND (2) CONTINUING THE AGITATION AT POLYMERIZATION TEMPERATURE UNTIL POLYMERIZATION IS SUBSTANTIALLY COMPLETE.
Claim 2
Dependent Claim
143 words
A PROCESS FOR THE PREPARATION OF A COPOLYMER OF (A) A POLYETHYLENE GLYCOL, AND (B) A MONOMERIC LIQUID COPOLYMERIZABLE WITH THE POLYETHYLENE GLYCOL, SAID LIQUID BEING SELECTED FROM THE GROUP CONSISTING OF (A) VINYL ESTERS OF ALKANOIC ACIDS HAVING FOUR TO TEN CARBON ATOMS IN THE ESTER, (B) ALKYL ESTES OF ACRYLIC AND METHACRYLIC ACIDS HAVING ONE TO EIGHT CARBON ATOMS IN THE ALKYL RADICAL, AND (C) MIXTURES OF THE SAID VINYL AND ALKYL ESTERS, WHICH COMPRISES (1) AGITATING AT POLYMERIZATION TEMPERATURE IN THE RANGE BETWEEN 20% C. AND REFLUX TEMPERATURE A SYSTEM CONSISTING ESSENTIALLY OF: (I) WATER, (II) THE POLYETHYLENE GLYCOL, (III) THE COPOLYMERIZABLE LIQUID AND (IV) A WATER-SOLUBLE POLYMERIZATION CATALYST FOR THE COPOLYMERIZABLE LIQUID OF THE GROUP CONSISTING OF WATERSOLUBLE FREE RADICAL CATALYST AND WATER-SOLUBLE REDUCTIONACTIVATED CATALYST SYSTEMS, AND (2) CONTINUING THE AGITATION AT POLYMERIZATION TEMPERATURE UNTIL POLYMERIZATION IS SUBSTANTIALLY COMPLETE.
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |