Patent US4760152A successfully refreshed from Google Patents.
US4760152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrrolidonyl acrylate block polymers
Assignee: Rhone Poulenc Surfactants and Specialties LP
•
Filing: 1987-03-02
•
Granted: 1988-07-26
•
Expires: 2007-03-02
Abstract
Abstract (1) Pyrrolidonyl acrylate block polymers having the formula ##STR1## wherein n has a value of 1 to 3; X and X' are dissimilar and each is hydrogen or methyl; y and z each have a value of from 1 to 40, except that at least one of y and z is greater than 1 and R is hydrogen or methyl; (2) preparation of said polymers and (3) uses of said polymers.
Inventors
- 👤 David J. Tracy
- 👤 Mohamed M. Hashem
- 👤 Fulvio J. Vara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:25
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/27; C07D211/00; C07D211/04; C07D211/68; C07D211/70; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; C08F20/36; C08F290/00; C08F290/02; C08F290/06; C08F290/062; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2618; C08G65/2621; C08G65/263; Y; Y10; Y10S; Y10S525/00; Y10S525/925; Y10S525/928; Y10S526/00; Y10S526/911
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
The compound having the formula: ##STR10## wherein n is an integer having a value of from 1 to 3; X and X' are dissimilar and each of X, X' and R is selected from the group consisting of hydrogen and methyl and y and z are integers each having a value of from 1 to 40, except, when X is methyl, y has a value greater than one and, when X' is methyl, z has a value greater than one.
Claim 2
Dependent Claim
80 words
The compound having the formula: ##STR10## wherein n is an integer having a value of from 1 to 3; X and X' are dissimilar and each of X, X' and R is selected from the group consisting of hydrogen and methyl and y and z are integers each having a value of from 1 to 40, except, when X is methyl, y has a value greater than one and, when X' is methyl, z has a value greater than one.
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein n is 1.
Claim 4
Dependent Claim
9 words
The compound of claim 2 wherein R is hydrogen.
Claim 5
Dependent Claim
9 words
The compound of claim 2 wherein R is methyl.
Claim 6
Dependent Claim
18 words
The compound of claim 2 wherein y and z each have a value of from 6 to 40.
Claim 7
Dependent Claim
21 words
The compound of claim 5 wherein the value of z is greater than the value of y and X' is methyl.
Claim 8
Dependent Claim
21 words
The compound of claim 5 wherein the value of y is greater than the value of z and X is methyl.
Claim 9
Dependent Claim
192 words
The process which comprises reacting under anhydrous conditions, at a temperature between about 120° and of about 180° C. under a pressure of between about 15 and about 80 psig for a period of from about 10 minutes to about 3 hours a lactam having the formula ##STR11## wherein n has a value of from 1 to 3; X is hydrogen or methyl and y has a value of from 2 to 40, with at least a 2 molar excess of an epoxide having the formula ##STR12## wherein X' is other than X and is hydrogen or methyl to produce an intermediate product having the formula ##STR13## wherein z has a value of from 2 to 40; dissolving said intermediate product in an inert solvent to form a solution containing between about 25 wt. % and about 75 wt. % intermediate product; reacting said intermediate product under acidic conditions in the presence of an antioxidant with an acrylic acid having the formula ##STR14## wherein R is hydrogen or methyl, removing water and unreacted acid from the resulting reaction mixture and recovering the product of claim 1 as the product of the process.
Claim 10
Dependent Claim
62 words
The process of claim 8 wherein said lactam is produced by reacting, under anhydrous conditions at a temperature between about 120° and about 180° C. a precursor lactam having the formula ##STR15## wherein n has a value of from 1 to 3, with at least a 2 molar excess of an epoxide having the formula ##STR16## wherein X is hydrogen or methyl.
Claim 11
Dependent Claim
12 words
The process of claim 8 wherein n of said lactam is 1.
Claim 12
Dependent Claim
13 words
The process of claim 9 wherein n of said precursor lactam is 1.
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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |