Patent US4528334A successfully refreshed from Google Patents.
US4528334A
Expired / Lapsed
US
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Carboxylated poly(oxyalkylenes)
Assignee: Union Carbide Corp
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Filing: 1984-04-30
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Granted: 1985-07-09
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Expires: 2004-04-30
Abstract
Abstract Graft copolymers are obtained which are substantially free of insoluble homopolymers by grafting 3 to 15 percent by weight of acrylic acid onto poly(oxyalkylene) compounds.
Inventors
- 👤 Robert J. Knopf
- 👤 Kenneth Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:29
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/06; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
187 words
A method for preparing graft copolymers of acrylic acid and a poly(oxyalkylene) which comprises adding in separate feed streams from about 3 percent to 15 percent by weight, based on the total weight of poly(oxyalkylene) charged, of acrylic acid and a catalytic amount of t-butyl perbenzoate, di-t-butyl peroxide or t-butyl hydroperoxide to an agitated bath of poly(oxyalkylene) whereby all of said components are intimately admixed at a temperature of about 100° C. to about 160° C. and maintaining said temperature until a graft copolymer of acrylic acid on said poly(oxyalkylene) is obtained which is substantially free of insoluble homopolymerized acrylic acid, said poly(oxyalkylene) having the formula: R"[(OC.sub.n H.sub.2n).sub.z OR'].sub.a wherein R" is a hydrocarbon radical containing up to 10 carbons which is free of aliphatic unsaturation and has a valence of a, a is an integer having a value of 1 to 4, R' is a hydrogen atom or a monovalent hydrocarbon radical containing up to 6 carbons which is free of aliphatic unsaturation, n has a value of 2 to 4, inclusive, and z is an integer having a value of about 8 to about 800.
Claim 2
Independent Claim
187 words
A method for preparing graft copolymers of acrylic acid and a poly(oxyalkylene) which comprises adding in separate feed streams from about 3 percent to 15 percent by weight, based on the total weight of poly(oxyalkylene) charged, of acrylic acid and a catalytic amount of t-butyl perbenzoate, di-t-butyl peroxide or t-butyl hydroperoxide to an agitated bath of poly(oxyalkylene) whereby all of said components are intimately admixed at a temperature of about 100° C. to about 160° C. and maintaining said temperature until a graft copolymer of acrylic acid on said poly(oxyalkylene) is obtained which is substantially free of insoluble homopolymerized acrylic acid, said poly(oxyalkylene) having the formula: R"[(OC.sub.n H.sub.2n).sub.z OR'].sub.a wherein R" is a hydrocarbon radical containing up to 10 carbons which is free of aliphatic unsaturation and has a valence of a, a is an integer having a value of 1 to 4, R' is a hydrogen atom or a monovalent hydrocarbon radical containing up to 6 carbons which is free of aliphatic unsaturation, n has a value of 2 to 4, inclusive, and z is an integer having a value of about 8 to about 800.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the poly(oxyalkylene) is derived from a mixture of ethylene oxide and propylene oxide.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the poly(oxyethylene) is started with a saturated aliphatic alcohol having up to 4 carbons.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the poly(oxyalkylene) is propylene oxide started with a saturated aliphatic alcohol having up to 4 carbons.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the separate acrylic acid and/or catalyst-containing reactant feed streams are added in a mixture with the poly(oxyalkylene).
Claim 7
Dependent Claim
29 words
Graft copolymer made by the method claimed in claim 1 which is substantially free of insoluble homopolymerized acrylic acid (contains less than 1% by weight of said insoluble homopolymer).
Claim 8
Dependent Claim
139 words
A homogeneous graft copolymer of acrylic acid on poly(oxyalkylene) having the formula R"[OC.sub.n H.sub.2n).sub.z OR'].sub.a wherein R" is a hydrocarbon radical containing up to 10 carbons which is free of aliphatic unsaturation and has a valence of a, a is an integer having a value of 1 to 4, R' is a hydrogen atom or a monovalent hydrocarbon radical containing up to 6 carbons which is free of aliphatic unsaturation, n has a value of 2 to 4, inclusive, and z is an integer having a value of about 8 to about 800, wherein the acrylic acid is in an amount of about 3 to 15 percent by weight based on the total weight of poly(oxyalkylene) and the graft copolymer is substantially free of insoluble homopolymer of acrylic acid (contains less than 1% by weight of said insoluble homopolymer).
Claim 9
Dependent Claim
139 words
A homogeneous graft copolymer of acrylic acid on poly(oxyalkylene) having the formula R"[OC.sub.n H.sub.2n).sub.z OR'].sub.a wherein R" is a hydrocarbon radical containing up to 10 carbons which is free of aliphatic unsaturation and has a valence of a, a is an integer having a value of 1 to 4, R' is a hydrogen atom or a monovalent hydrocarbon radical containing up to 6 carbons which is free of aliphatic unsaturation, n has a value of 2 to 4, inclusive, and z is an integer having a value of about 8 to about 800, wherein the acrylic acid is in an amount of about 3 to 15 percent by weight based on the total weight of poly(oxyalkylene) and the graft copolymer is substantially free of insoluble homopolymer of acrylic acid (contains less than 1% by weight of said insoluble homopolymer).
Claim 10
Dependent Claim
20 words
The graft copolymer of claim 7 wherein the poly(oxyalkylene) is derived from a mixture of ethylene oxide and propylene oxide.
Claim 11
Dependent Claim
22 words
The graft copolymer of claim 7 wherein the poly(oxyalkylene) is poly(oxyethylene) started with a saturated aliphatic alcohol having up to 4 carbons.
Claim 12
Dependent Claim
22 words
The graft copolymer of claim 7 wherein the poly(oxyalkylene) is poly(oxypropylene) started with a saturated aliphatic alcohol having up to 4 carbons.
Claim 13
Dependent Claim
25 words
The graft copolymer of claim 7 wherein the molecular weight (number average) of the poly(oxyalkylene) is in the range of about 1500 to about 4000.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |