Patent US3865898A successfully refreshed from Google Patents.
US3865898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing block copolymers with carbamate linkages between a polyvinyl chain and a polymer having active hydrogens
Assignee: Individual
•
Filing: 1973-02-26
•
Granted: 1975-02-11
•
Expires: 1993-02-26
Abstract
Abstract Method for forming block copolymers by reacting a polymer constituent with bis(4-isocyanatocyclohexyl)methane and then reacting the resulting isocyanate-capped prepolymer with a dihydroperoxide to form a peroxycarbamate which is used to initiate the polymerization of an ethylenically-unsaturated monomer. The resulting block copolymers can be formed as transparent films.
Inventors
- 👤 Arthur V Tobolsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/86; C08F; C08F293/00
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
58 words
A METHOD FOR PREPARING BLOCK COPOLYMER, COMPRISING THE STEPS OF A. REACTING A POLYMER CONSTITUENT WITH DIS(4ISOCYANATOCYCLOHEXYL) METHANE AT A TEMPERATURE RANGING BETWEEN ABOUT 50* AND ABOUT 80*C THEREBY TO FORM AN ISOCYANATE-CAPED PERPOLYMER; B. REACTING AT A TEMPERATURE UP TO ABOUT 50*C SAID ISOCYANATE- CAPPED PERPOLYMER WITH A DIHYDROPEROXIDE OF THE FORMULA HOOC(CH3)2-R-C(CH2) 3OOH WHEREIN R IS
Claim 2
Independent Claim
58 words
A METHOD FOR PREPARING BLOCK COPOLYMER, COMPRISING THE STEPS OF A. REACTING A POLYMER CONSTITUENT WITH DIS(4ISOCYANATOCYCLOHEXYL) METHANE AT A TEMPERATURE RANGING BETWEEN ABOUT 50* AND ABOUT 80*C THEREBY TO FORM AN ISOCYANATE-CAPED PERPOLYMER; B. REACTING AT A TEMPERATURE UP TO ABOUT 50*C SAID ISOCYANATE- CAPPED PERPOLYMER WITH A DIHYDROPEROXIDE OF THE FORMULA HOOC(CH3)2-R-C(CH2) 3OOH WHEREIN R IS
Claim 3
Dependent Claim
17 words
A method in accordance with claim 1 wherein steps (a)-(d) are carried out in a nonoxidizing atmosphere.
Claim 4
Dependent Claim
13 words
A method in accordance with claim 2 wherein said nonoxidizing atmosphere is nitrogen.
Claim 5
Dependent Claim
18 words
A method in accordance with claim 1 wherein step (a) is carried out in an inert organic solvent.
Claim 6
Dependent Claim
18 words
A method in accordance with claim 1 wherein step (b) is carried out in an inert organic solvent.
Claim 7
Dependent Claim
12 words
A method in accordance with claim 1 wherein said dihydroperoxide is 2,5-dimethyl-2,5-bis(hydroperoxy)hexane.
Claim 8
Dependent Claim
12 words
A method in accordance with claim 1 wherein said dihydroperoxide is p-diisopropylbenzene-bis(hydroperoxide).
Claim 9
Dependent Claim
36 words
A method in accordance with claim 1 wherein said ethylenically-unsaturated monomer is a solvent for said peroxycarbamate and serves as said liquid medium, whereby said polymerization of step (d) is carried out as a bulk polymerization.
Claim 10
Dependent Claim
30 words
A method in accordance with claim 1 wherein said polymerization of step (d) is carried out in an inert organic solvent serving as at least portion of said liquid medium.
Claim 11
Dependent Claim
30 words
A method in accordance with claim 1 wherein said polymerization of step (d) is carried out in an inert nonsolvent liquid serving as at least portion of said liquid medium.
Claim 12
Dependent Claim
20 words
A method in accordance with claim 1 wherein steps (a)-(d) are performed without isolating any of the intermediate compounds formed.
Claim 13
Dependent Claim
15 words
A method in accordance with claim 1 wherein said isocyanate-capped prepolymer is isolated and purified.
Claim 14
Dependent Claim
14 words
A method in accordance with claim 1 wherein said peroxycarbamate is isolated and purified.
Claim 15
Dependent Claim
39 words
A method in accordance with claim 1 including the further step of adding in step (c) a polymerization catalyst in a quantity ranging between about 10 4 and about 10 2 gram moles per liter of said liquid medium.
Claim 16
Dependent Claim
36 words
A method in accordance with claim 1 including the further step of adding a chain extender for said prepolymer in step (b), the molar ratio of said chain extender to said dihydroperoxide being up to 10.
Claim 17
Dependent Claim
25 words
A method in accordance with claim 15 wherein the molar ratio of dihydroperoxide plus chain extender to said prepolymer is between about 0.8 and 1.2.
Claim 18
Dependent Claim
16 words
A method in accordance with claim 1 wherein said polymer constituent is a polyethylene glycol ester.
Claim 19
Dependent Claim
16 words
A method in accordance with claim 1 wherein said polymer constituent is a polyethylene glycol ether.
Claim 20
Dependent Claim
20 words
A method in accordance with claim 1 wherein said polymer constituent is a polyester of adipic, succinic or azelaic acid.
Claim 21
Dependent Claim
15 words
A method in accordance with claim 19 wherein said polymer constituent is ethylene-propylene adipate polyester.
Claim 22
Dependent Claim
15 words
A method in accordance with claim 1 wherein said ethylenically-unsaturated monomer is a vinyl monomer.
Claim 23
Dependent Claim
13 words
A method in accordance with claim 21 wherein said vinyl monomer is styrene.
Claim 24
Dependent Claim
14 words
A method in accordance with claim 1 wherein said monomer is an acrylic ester.
Claim 25
Dependent Claim
20 words
A method in accordance with claim 1 wherein said monomer is a mixture of acrylic acid and an acrylic estEr.
Claim 26
Dependent Claim
14 words
A method in accordance with claim 1 wherein said monomer is a methacrylate ester.
Claim 27
Dependent Claim
14 words
A method in accordance with claim 25 wherein said methacrylic ester is 2-hydroxyethyl methacrylate.
Claim 28
Dependent Claim
14 words
A method in accordance with claim 25 wherein said methacrylate ester is methyl methacrylate.
Claim 29
Dependent Claim
23 words
A method in accordance with claim 1 wherein said monomer is a mixture of a methacrylic ester and an acrylic or methacrylic acid.
References Cited (Backward Citations)
US3257476A
Cited
US3291859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |