US4584354A
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Graft copolymers and the method of their preparation
Assignee: Czech Academy of Sciences
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Filing: 1984-10-18
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Granted: 1986-04-22
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Expires: 2004-10-18
Abstract
Abstract Graft copolymers are formed having a backbone formed by monomeric units, selected from the group of vinyl monomers comprising acrylates, methacrylates, acrylamide, styrene and N-vinyl-2-phyrrolidone, and side branches formed by 10-80 wt. % of oligourethanes based on aliphatic, aromatic and alkylaromatic diisocyanates and low-molecular-weight diols with 2-4 carbon atoms in the molecule. The graft copolymers are prepared in two steps: the first step consists in the synthesis of oligourethane with the terminal unsaturated group; the second step is the radical copolymerization of this oligourethane with the above vinyl monomers.
Inventors
- 👤 Slavko Hudecek
- 👤 Ivana Hudeckova
- 👤 Pavel Cefelin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:08
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/06; C08F299/065; Y; Y10; Y10S; Y10S525/00; Y10S525/92
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
Grafted copolymers, comprising a basic polymer chain formed by monomer units selected from the group consisting of acrylates, methacrylates, acrylamide, styrene and N-vinyl-2-pyrrolidone, and side branches formed by 10-80 weight percent by oligourethanes based on aliphatic, aromatic and alkylaromatic diisocyanate and aliphatic low-molecular-weight diols having 2-4 carbon atoms in the molecule, said side branches and said basic polymer chain being linked through a single terminal ethylenic unsaturated bond introduced into said side branches through the reaction of 0.03-0.25 mol of hydroxyalkyl acrylate or methacrylate with each mol diisocyanate in the presence of an aprotic solvent, said copolymer having a physical network comprising rigid crystalline urethane-diol micro-domains capable of being reversibly broken down by heating and reformed by cooling.
Claim 2
Dependent Claim
118 words
Grafted copolymers, comprising a basic polymer chain formed by monomer units selected from the group consisting of acrylates, methacrylates, acrylamide, styrene and N-vinyl-2-pyrrolidone, and side branches formed by 10-80 weight percent by oligourethanes based on aliphatic, aromatic and alkylaromatic diisocyanate and aliphatic low-molecular-weight diols having 2-4 carbon atoms in the molecule, said side branches and said basic polymer chain being linked through a single terminal ethylenic unsaturated bond introduced into said side branches through the reaction of 0.03-0.25 mol of hydroxyalkyl acrylate or methacrylate with each mol diisocyanate in the presence of an aprotic solvent, said copolymer having a physical network comprising rigid crystalline urethane-diol micro-domains capable of being reversibly broken down by heating and reformed by cooling.
Claim 3
Dependent Claim
15 words
The grafted copolymer according to claim 1 wherein said aprotic solvent is dimethylformamide or dimethylsulfoxide.
Claim 4
Dependent Claim
86 words
A method for the preparation of the grafted copolymers according to claim 1, comprising the steps of first synthesizing a oligourethane having one terminal unsaturated group and, in a second step, copolymerizing said synthesized oligourethane by radical mechanism with low-molecular-weight vinyl monomers selected from the group consisting of acrylates, methacrylates, acrylamide, styrene and N-vinyl-2-pyrrolidone, said terminal unsaturated group being introduced into said oligourethane through the reaction of 0.03-0.25 mol of hydroxyalkyl acrylate or methacrylate with each mol of diisocyanante in the presence of an aprotic solvent.
Claim 5
Dependent Claim
15 words
The grafted copolymer according to claim 3 wherein said aprotic solvent is dimethylformamide or dimethylsulfoxide.
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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |