US4222925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanizable silicon terminated polyurethane polymer compositions having improved cure speed
Assignee: ADCO TECHNOLOGIES Inc
•
Filing: 1978-08-02
•
Granted: 1980-09-16
•
Expires: 1998-08-02
Abstract
Abstract Room-temperature-curable silicon-terminated organic sealant compositions having improved cure speeds, and metal and glass primer compositions for use therewith. These sealant compositions comprise a blend of a small amount of N-beta-aminoethyl, gamma - aminopropyl trimethoxy silane with an organosilicon-capped, isocyanate-terminated polyurethane polymer. The composition further comprises a carbon black filler containing less than 0.05% of water and preferably further comprises a moisture-curing catalyst such as dibutyl tin diacetate.
Inventors
- 👤 Earle R. Bryant
- 👤 Gerald H. Knittel
- 👤 Lon E. Dircks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:57
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K5/00; C08K5/54; C08L; C08L2666/00; C08L2666/28; C08L2666/44; C08L2666/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
In a sealant composition comprised of a prepolymer which is a blend of: (a) a silicon terminated vulcanizable polyurethane polymer of the formula ##STR2## wherein R is a lower alkyl radical of from 1 to 6 carbon atoms, R' is a divalanet bridging radical selected from the group consisting of a divalent hydrocarbon radical, and a divalent hydrocarbon ether radical, and wherein Z is a member selected from the group consisting of S and NR", where R" is H or a lower alkyl radical of from 1 to 6 carbons with (b) a small amount of N-beta aminoethyl, gamma aminopropyl trimethoxy silane, the improvement comprising adding, as a reinforcing filler, a high strength carbon black containing less than 0.05% of water to obtain a sealant having a viscosity as indicated by K value of less than 850, and a cure speed of at least 70 psi cleavage in three hours elapsed time.
Claim 2
Dependent Claim
152 words
In a sealant composition comprised of a prepolymer which is a blend of: (a) a silicon terminated vulcanizable polyurethane polymer of the formula ##STR2## wherein R is a lower alkyl radical of from 1 to 6 carbon atoms, R' is a divalanet bridging radical selected from the group consisting of a divalent hydrocarbon radical, and a divalent hydrocarbon ether radical, and wherein Z is a member selected from the group consisting of S and NR", where R" is H or a lower alkyl radical of from 1 to 6 carbons with (b) a small amount of N-beta aminoethyl, gamma aminopropyl trimethoxy silane, the improvement comprising adding, as a reinforcing filler, a high strength carbon black containing less than 0.05% of water to obtain a sealant having a viscosity as indicated by K value of less than 850, and a cure speed of at least 70 psi cleavage in three hours elapsed time.
Claim 3
Dependent Claim
19 words
The sealant composition of claim 1 containing up to 25% by weight of plasticizer based on weight of polymer.
Claim 4
Dependent Claim
24 words
The sealant composition of claim 1 having a tensile strength of at least 900 psi and an elongation at break of at least 250%.
Claim 5
Dependent Claim
18 words
The sealant composition of claim 1 having a cleavage value of at least 70 psi after 3 hours.
Claim 6
Dependent Claim
13 words
The sealant composition of claim 4 wherein the catalyst is dibutyl tin diacetate.
Claim 7
Dependent Claim
22 words
The sealant composition of claim 5 wherein R is CH 3 , R' is C 3 H 6 and Z is NH.
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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |