Patent US628347A successfully refreshed from Google Patents.
Patent US3800007A successfully refreshed from Google Patents.
US3800007A
Expired / Lapsed
US
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Process for preparing block copolymers with peroxy containing chain- transfer agents and products
Assignee: Pennwalt Corp
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Filing: 1971-10-18
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Granted: 1974-03-26
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Expires: 1991-10-18
Abstract
Abstract Block copolymers are prepared by polymerizing an unsaturated monomer in the presence of a polymerization catalyst and a chain transfer agent which is a cumyl peroxide containing one or more alkyl or cycloalkyl substituents, which substituents have at least one benzylic hydrogen atom, at a temperature below that which the peroxide decomposes, and subsequently polymerizing the peroxy containing polymer so formed in the presence of additional monomer at a temperature above the decomposition point of the peroxide.
Inventors
- 👤 R Bafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:09
CPC Classifications
C; C08; C08F; C08F293/00; Y; Y10; Y10S; Y10S260/00; Y10S260/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
37 words
The process of claim 1 in which the initial polymerization step (a) is conducted at a temperature of -10* to 70* C. and the second polymerization (b) is conducted at a temperature of 80* to 150* C.
Claim 2
Dependent Claim
15 words
The process of claim 1 in which the chain transfer peroxide is p-isopropylcumyl t-butyl peroxide.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the chain transfer peroxide is bis(p-isopropylcumyl) peroxide.
Claim 4
Dependent Claim
15 words
The process of claim 1 in which the chain transfer peroxide is 2,4,6-trimethylcumyl t-butyl peroxide.
Claim 5
Dependent Claim
15 words
The process of claim 1 in which the chain transfer peroxide is p-methylcumyl cumyl peroxide.
Claim 6
Dependent Claim
15 words
The process of claim 1 in which the chain transfer peroxide is p-methylcumyl t-butyl peroxide.
Claim 7
Dependent Claim
14 words
The process of claim 1 in which the chain transfer peroxide is 1-t-butylperoxy-1-methyl indane.
Claim 8
Dependent Claim
15 words
The process of claim 1 in which R is methyl, isopropyl or sec-butyl; R'' is
Claim 9
Dependent Claim
10 words
The process of claim 9 in which R is isopropyl.
Claim 10
Dependent Claim
35 words
The process of claim 1 in which the initial polymerization step (a) is conducted at a temperature of up to 80* C. and the second polymerization step is conducted at a temperature above 80* C.
Claim 11
Dependent Claim
23 words
The process of claim 11 in which the monomer of step (a) is styrene and the monomer of step (b) is methyl methacrylate.
Claim 12
Dependent Claim
15 words
The process of claim 1 in which the addition polymerization initiator is a free-radical catalyst.
Claim 13
Dependent Claim
13 words
The process of claim 13 in which the addition initiator is dibenzoyl peroxide.
References Cited (Backward Citations)
US2984648A
Cited
GB857145A
Cited
US3189664A
Cited
US3485894A
Cited
US3429951A
Cited
US3706818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |