Patent US3671492A successfully refreshed from Google Patents.
US3671492A
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1:1 alternating copolymers of carbonyl or thiocarbonyl-containing non-conjugated compounds and conjugated compounds and method of preparation
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1970-03-16
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Granted: 1972-06-20
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Expires: 1990-03-16
Abstract
Abstract A novel alternating copolymer is prepared by copolymerizing a compound having a polar group, such as a carbonyl or thiocarbonyl group, at a non-conjugated position and a conjugated vinyl compound in the presence of an organoaluminum halide. Alternating copolymers thus-produced are superior in thermal stability to conventional random copolymers and is resistant to coloration. Alternating copolymers obtained by copolymerizing vinyl acetate and methyl acrylate or acrylonitrile are preferred examples of these products.
Inventors
- 👤 Kohei Nakaguchi
- 👤 Shohachi Kawasumi
- 👤 Masaaki Hirooka
- 👤 Hiroshi Yabuuchi
- 👤 Hiroyoshi Takao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:36
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/06; C08F4/12; C08F214/00; C08F236/00; C08F236/02; C08F236/04; C08F236/14; C08F236/16; C08F236/18; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
An alternating copolymer according to claim 1, wherein said monomer of Group A is an unsaturated ester of carboxylic acid, and said monomer of group B is selected from the group consisting of acrylonitrile, an acrylate, an acrylamide, acrylic acid and the above compounds in which the Alpha - or Beta -position of the monomer of group B is substituted by a hydrocarbon group having one to 20 carbon atoms, a halogen-containing hydrocarbon group having one to 20 carbon atoms or a halogen atom.
Claim 2
Dependent Claim
47 words
An alternating copolymer according to claim 1, wherein said monomer of group A is a vinyl or allyl ester of a carboxylic acid and said monomer of group B is selected from the group consisting of acrylonitrile, an ester of acrylic acid, an acrylamide and acrylic acid.
Claim 3
Dependent Claim
59 words
An alternating copolymer according to claim 1, wherein said monomer of group A is selected from the group consisting of vinyl acetate, vinyl formate, vinyl propionate, vinyl stearate, vinyl benzoate, vinyl chloroacetate, allyl acetate, N-vinyl pyrrolidone and N-vinyl acetamide, and said monomer of group B is selected from the group consisting of acrylonitrile, alkyl acrylates, acrylamides and acrylic acid.
Claim 4
Dependent Claim
24 words
An alternating copolymer according to claim 1, wherein said monomer of group A is vinyl acetate and said monomer of group B is acrylonitrile.
Claim 5
Dependent Claim
32 words
An alternating copolymer according to claim 1, wherein said monomer of group A is vinyl acetate and said monomer of group B is methyl acrylate, ethyl acrylate, butyl acrylate or acrylic acid.
Claim 6
Dependent Claim
292 words
A process for producing a copolymer, which comprises contacting at a temperature of from -150* C to +100* C a monomer of group A and a monomer of group B described in claim 1 with (1) an organoaluminum halide having the formula: AlR''''''nX3-n wherein R'''''' is a hydrocarbon radical having one to 20 carbon atoms; X is a halogen atom; and n is an arbitrary value from 1 to 2, or a mixture of at least two compounds having the formulas: A. AlR''''''nX3-n , B. BrIV3 and C. BX''3 wherein R'''''' and RIV each is a hydrocarbon radical having one to 20 carbon atoms; X and X'' each is a halogen atom; and n is an arbitrary value of 1 to 2, or with (2) an organometal halide complex obtained by contacting, in the presence of at least one monomer of the group B, (a) an organic compound having the formula: M''''''RVX''''p n where M'''''' is a metal of Group IIb, IIIb or IVb of Mendeleev''s Periodic Table; RV is a hydrocarbon group having one to 20 carbon atoms; X'''' is a halogen atom; p is the valency of the metal; and n is an arbitrary value of 1 to p, and (b) a halogeno-compound having the formula: MIVX''''''mRVIq-n where MIV is a metal of Group IIIb or IVb of Mendeleev''s Periodic Table; X'''''' is a halogen atom; RVI is a hydrocarbon radical having one to 20 carbon atoms; q is the valency of the metal; and m is an arbitrary value of 1 to q, and at least one metal component of (a) and (b) is aluminum or boron and wherein the catalyst is employed in an amount of from about 0.05 to about 10 moles per mole of monomer (B).
Claim 7
Dependent Claim
21 words
A process according to claim 7, wherein the organo-aluminum halide is an alkylaluminum dihalide, an alkylaluminum sesquihalide or a dialkylaluminum halide.
Claim 8
Dependent Claim
33 words
A process according to claim 7, wherein the copolymerization is effected in the presence of 0.01 to 5 percent of oxygen or an organic peroxide per mole of the monomer of group B.
Claim 9
Dependent Claim
24 words
A process according to claim 7, wherein the copolymerization is carried out in a liquid monomer, a hydrocarbon medium or a halogenated hydrocarbon medium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |