Patent US4666978A successfully refreshed from Google Patents.
US4666978A
Expired / Lapsed
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Method of curing unsaturated polyester resins at low temperatures
Assignee: University of Southern Mississippi
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Filing: 1985-11-27
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Granted: 1987-05-19
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Expires: 2005-11-27
Abstract
Abstract Method of promoting the cure of unsaturated polyester resins with a peroxide initiator at room or below room temperatures (low temperatures) by including as a promoter N,N-dimethyl-p-toluidine (DMPT) or a blend of DMPT and N,N-dimethyl-m-toluidine (DMMT) and to the polyester composition containing such promoter. The use of the DMPT or blend of DMPT and DMMT as a promoter provides a fast cure at low temperatures without loss of physical properties of the cured resins.
Inventors
- 👤 Robson F. Storey
- 👤 Sudhakar Dantiki
- 👤 Melissa L. Hogue
- 👤 Arthur C. Bayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:39
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/04; C08F299/0442; C08F299/045
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
82 words
In the method of curing unsaturated polyester resins with a peroxide initiator at room temperature or below room temperature, the improvement wherein said curing is carried out in the presence of a promoter selected from the group consisting of N,N-dimethyl-p-toluidine and a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing at least 40% N,N-dimethyl-p-toluidine with said promoter being present in an amount sufficient to increase the cure rate in relation to dimethylaniline by a factor of at least 2 at 10° C.
Claim 2
Dependent Claim
82 words
In the method of curing unsaturated polyester resins with a peroxide initiator at room temperature or below room temperature, the improvement wherein said curing is carried out in the presence of a promoter selected from the group consisting of N,N-dimethyl-p-toluidine and a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing at least 40% N,N-dimethyl-p-toluidine with said promoter being present in an amount sufficient to increase the cure rate in relation to dimethylaniline by a factor of at least 2 at 10° C.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the curing is at a temperature below 20° C.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 80:20.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 65:35.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 60:40.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 40:60.
Claim 8
Dependent Claim
10 words
The method of claim 1 wherein the promoter is N,N-dimethyl-p-toluidine.
Claim 9
Dependent Claim
12 words
The method of claim 1 wherein the peroxide initiator is benzoyl peroxide.
Claim 10
Dependent Claim
12 words
The method of claim 2 wherein the peroxide initiator is benzoyl peroxide.
Claim 11
Dependent Claim
69 words
A polymerizable composition characterized by accelerated polymerization comprising a polymerizable unsaturated polyester resin, a peroxide initiator, and a cure promoter selected from the group consisting of N,N-dimethyl-p-toluidine and a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing at least 40% N,N-dimethyl-p-toluidine with said promoter being present in an amount sufficient to increase the cure rate in relation to dimethylaniline by a factor of at least 2 at 10° C.
Claim 12
Dependent Claim
69 words
A polymerizable composition characterized by accelerated polymerization comprising a polymerizable unsaturated polyester resin, a peroxide initiator, and a cure promoter selected from the group consisting of N,N-dimethyl-p-toluidine and a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing at least 40% N,N-dimethyl-p-toluidine with said promoter being present in an amount sufficient to increase the cure rate in relation to dimethylaniline by a factor of at least 2 at 10° C.
Claim 13
Dependent Claim
12 words
The composition of claim 10 wherein the peroxide initiator is benzoyl peroxide.
Claim 14
Dependent Claim
18 words
The composition of claim 11 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 80:20.
Claim 15
Dependent Claim
18 words
The composition of claim 11 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 65:35.
Claim 16
Dependent Claim
18 words
The composition of claim 11 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 60:40.
Claim 17
Dependent Claim
18 words
The composition of claim 11 wherein the blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine is in a ratio of 40:60.
Claim 18
Dependent Claim
43 words
In the method of curing unsaturated polyester resins with a peroxide initiator, the improvement wherein said curing is carried out in the presence of a promoter which is a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing from about 40% to 80% N,N-dimethyl-p-toluidine.
Claim 19
Dependent Claim
43 words
In the method of curing unsaturated polyester resins with a peroxide initiator, the improvement wherein said curing is carried out in the presence of a promoter which is a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing from about 40% to 80% N,N-dimethyl-p-toluidine.
Claim 20
Dependent Claim
37 words
A polymerizable composition characterized by accelerated polymerization comprising a polymerizable unsaturated polyester resin, a peroxide initiator, and a cure promoter which is a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing from about 40% to 80% N,N-dimethyl-p-toluidine.
Claim 21
Dependent Claim
37 words
A polymerizable composition characterized by accelerated polymerization comprising a polymerizable unsaturated polyester resin, a peroxide initiator, and a cure promoter which is a blend of N,N-dimethyl-p-toluidine and N,N-dimethyl-m-toluidine, said blend containing from about 40% to 80% N,N-dimethyl-p-toluidine.
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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |