US4127545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot melt crosslinked butyl sealant
Assignee: Cities Service Co
•
Filing: 1977-07-27
•
Granted: 1978-11-28
•
Expires: 1997-07-27
Abstract
Abstract Hot melt sealant compositions having improved adhesive bonding properties comprise a slightly crosslinked butyl rubber and critically-controlled amounts of a crystalline polymeric resin and a tackifying resin.
Inventors
- 👤 John E. Callan
- 👤 Eric L. Scheinbart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:16
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/18; C09J123/20; C09J123/22; C09J123/04; C09J123/08; C09J123/0846; C09J123/0853; C09J133/00; C09J133/04; C09J133/06; C09J133/08; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/18; C08L23/20; C08L23/22; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/06; C09J2301/00; C09J2301/30; C09J2301/304
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A hot melt sealant composition having a yield strength of about 60-350 psi at room temperature and comprising (a) a slightly crosslinked butyl rubber compound having a Mooney viscosity (ML 1+3 at 260° F.) of 55±5, (b) about 25-200 phr of a crystalline polymeric resin selected from the group consisting of ethylene-ethyl acrylate copolymers and ethylene-vinyl acetate copolymers, and (c) about 25-200 phr of a tackifying resin selected from the group consisting of hydrocarbon resins, phenolic resins, coumarone-indene resins, and natural and modified rosins.
Claim 2
Dependent Claim
84 words
A hot melt sealant composition having a yield strength of about 60-350 psi at room temperature and comprising (a) a slightly crosslinked butyl rubber compound having a Mooney viscosity (ML 1+3 at 260° F.) of 55±5, (b) about 25-200 phr of a crystalline polymeric resin selected from the group consisting of ethylene-ethyl acrylate copolymers and ethylene-vinyl acetate copolymers, and (c) about 25-200 phr of a tackifying resin selected from the group consisting of hydrocarbon resins, phenolic resins, coumarone-indene resins, and natural and modified rosins.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein the concentrations of crystalline and tackifying resins are each about 50-150 phr.
Claim 4
Dependent Claim
18 words
The composition of claim 2 wherein the concentrations of crystalline and tackifying resins are each about 100 phr.
References Cited (Backward Citations)
US3630980A
Cited
US3674735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |