Patent US1933718A successfully refreshed from Google Patents.
Patent US4075286A successfully refreshed from Google Patents.
US4075286A
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US
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Preparation of block polymers using polyazo sequential free radical initiators
Assignee: Arkema Inc
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Filing: 1974-05-30
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Granted: 1978-02-21
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Expires: 1994-05-30
Abstract
Abstract A process for preparing a block polymer by first forming a polymer having azo functions by reacting vinyl polymer and a polyazo compound under conditions so that one of the azo functions rupture leaving the other azo function in tact; then, vinyl monomer is reacted with the polymer to produce the block copolymer. The polyazo compounds must contain at least one alkyl or aryl thio or oxa group alpha to at least one of the azo groups in the connecting chain between the azo groups to be useful as the sequential generator of free radicals.
Inventors
- 👤 Ronald Edward MacLeay
- 👤 Chester Stephen Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:38
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/04
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
121 words
A process for preparing a block copolymer which comprises (a) forming a polymer having azo functions present by reacting vinyl polymer and a polyazo compound under vinyl polymerization conditions controlled to cause one type of azo function to rupture leaving the other type or azo function intact, said rupture having the effect of initiating polymerization of said vinyl polymer; and (b) reacting vinyl monomer with the polymer step (a) under conditions to rupture the azo function of said step (a) polymer to produce a block copolymer, said polyazo compound having the formula (C--N ═ N--A--B--A'--N .sub.n (N--C').sub.2-n where: (a) n = 1 or 2; (b) C and C' are different unless--A--B--A'--is unsymmetrical and are selected from ##STR54## aryl of 6-14 carbons;
Claim 2
Dependent Claim
121 words
A process for preparing a block copolymer which comprises (a) forming a polymer having azo functions present by reacting vinyl polymer and a polyazo compound under vinyl polymerization conditions controlled to cause one type of azo function to rupture leaving the other type or azo function intact, said rupture having the effect of initiating polymerization of said vinyl polymer; and (b) reacting vinyl monomer with the polymer step (a) under conditions to rupture the azo function of said step (a) polymer to produce a block copolymer, said polyazo compound having the formula (C--N ═ N--A--B--A'--N .sub.n (N--C').sub.2-n where: (a) n = 1 or 2; (b) C and C' are different unless--A--B--A'--is unsymmetrical and are selected from ##STR54## aryl of 6-14 carbons;
Claim 3
Dependent Claim
21 words
(c) A and A' are the same or different, at least one being ##STR55## and the other being selected from ##STR56##
Claim 4
Dependent Claim
21 words
(c) A and A' are the same or different, at least one being ##STR55## and the other being selected from ##STR56##
Claim 5
Dependent Claim
6 words
(d) B is selected from ##STR57##
Claim 6
Dependent Claim
6 words
(d) B is selected from ##STR57##
Claim 7
Dependent Claim
6 words
(e) X is sulfur or oxygen;
Claim 8
Dependent Claim
6 words
(e) X is sulfur or oxygen;
Claim 9
Dependent Claim
12 words
(f) Y is selected from lower alkyl of 1-4 carbons, --CN, ##STR58##
Claim 10
Dependent Claim
12 words
(f) Y is selected from lower alkyl of 1-4 carbons, --CN, ##STR58##
Claim 11
Dependent Claim
14 words
(g) Z is selected from--CN, --Cl,--Br, --N 3 , --XCN, --R 1 , ##STR59##
Claim 12
Dependent Claim
14 words
(g) Z is selected from--CN, --Cl,--Br, --N 3 , --XCN, --R 1 , ##STR59##
Claim 13
Dependent Claim
16 words
(h) R is selected from hydrogen, lower alkyl of 1-6 carbons and aryl of 6-14 carbons;
Claim 14
Dependent Claim
16 words
(h) R is selected from hydrogen, lower alkyl of 1-6 carbons and aryl of 6-14 carbons;
Claim 15
Dependent Claim
32 words
(i) R 1 and R' 1 are the same or different and are selected from alkyl of 1-8 carbons, cycloalkyl of 3-10 carbons, aralkyl of 7-12 carbons and aryl of 6-14 carbons;
Claim 16
Dependent Claim
32 words
(i) R 1 and R' 1 are the same or different and are selected from alkyl of 1-8 carbons, cycloalkyl of 3-10 carbons, aralkyl of 7-12 carbons and aryl of 6-14 carbons;
Claim 17
Dependent Claim
22 words
(j) R 2 and R' 2 are the same or different and are alkyl of 1-10 carbons or cycloalkyl of 3-10 carbons;
Claim 18
Dependent Claim
22 words
(j) R 2 and R' 2 are the same or different and are alkyl of 1-10 carbons or cycloalkyl of 3-10 carbons;
Claim 19
Dependent Claim
36 words
(k) R 1 and R 2 , R' 2 and R 5 and R' 1 and R' 2 when taken together with the tertiary carbon linked to the azo group, form a cycloalkyl of 4-12 carbons;
Claim 20
Dependent Claim
36 words
(k) R 1 and R 2 , R' 2 and R 5 and R' 1 and R' 2 when taken together with the tertiary carbon linked to the azo group, form a cycloalkyl of 4-12 carbons;
Claim 21
Dependent Claim
8 words
(l) R 4 is tertiary-alkyl of 4-8 carbons;
Claim 22
Dependent Claim
8 words
(l) R 4 is tertiary-alkyl of 4-8 carbons;
Claim 23
Dependent Claim
47 words
(m) R 5 is a diradical selected from alkyl of 1-12 carbons terminated by carbon atoms and containing 0-1 carbonyls and 0-4 nonadjacent oxygen, sulfur and nitrogen atoms in its backbone structure, alkylcycloalkyl or alkylcycloalkylalkyl of up to 12 carbons aralkyl of 7-12 carbons and phenyl; and
Claim 24
Dependent Claim
47 words
(m) R 5 is a diradical selected from alkyl of 1-12 carbons terminated by carbon atoms and containing 0-1 carbonyls and 0-4 nonadjacent oxygen, sulfur and nitrogen atoms in its backbone structure, alkylcycloalkyl or alkylcycloalkylalkyl of up to 12 carbons aralkyl of 7-12 carbons and phenyl; and
Claim 25
Dependent Claim
20 words
(n) R 6 is selected from lower akylene and cycloalkylene of 2-10 carbons, and an aromatic radical of 6-12 carbons.
Claim 26
Dependent Claim
20 words
(n) R 6 is selected from lower akylene and cycloalkylene of 2-10 carbons, and an aromatic radical of 6-12 carbons.
Claim 27
Dependent Claim
22 words
The process of claim 1 wherein the monomer of step (a) is styrene and the monomer of step (b) is methyl methacrylate.
Claim 28
Dependent Claim
12 words
The process of claim 2 wherein the polyazo compound is 4-t-butylazo-4-methyl-3-thiapentyl 4-t-butylazo-4-cyanovalerate.
Claim 29
Dependent Claim
12 words
The process of claim 2 wherein the polyazo compound is 4-t-butylazo-4,6-dimethyl-3-thiaheptyl 4-t-butylazo-4-cyanovalerate.
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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |