US4601935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
EPDM laminate
Assignee: Omnova Services Inc
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Filing: 1985-05-06
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Granted: 1986-07-22
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Expires: 2005-05-06
Abstract
Abstract Cured rubbery carbon black reinforced EPDM roofing membranes are joined at their primed seams by a seaming tape comprising a carbon black reinforced compounded lightly cured blend of a butyl rubber and a polyisobutylene. The tape can exhibit a peel strength of at least about 2.5 pli at about 158 DEG F.
Inventors
- 👤 Fredric D. Metcalf
- 👤 John G. Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:44
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/02; B32B25/04; B32B25/042; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/128; C09; C09J; C09J123/00; C09J123/02; C09J123/18; C09J123/20; C09J123/22; C09J123/26; C09J123/28; C09J123/283; E; E04; E04D; E04D5/00; E04D5/14; E04D5/141; E04D5/142; E04D5/148; B32B2323/00; B32B2323/16; B32B2419/00; B32B2419/06; C08J2323/00; C08J2323/02; C08J2323/16; C08L; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10T; Y10T428/00; Y10T428/19; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24405; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31855; Y10T428/31909; Y10T428/31924
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A laminate comprising two cured, carbon black reinforced rubbery EPDM membranes joined together at their primed seams by a seaming tape comprising a lightly cured to a low cross-link density, carbon black reinforced, compounded, tacky and rubbery composition comprising from about 40 to 60 parts by weight of polyisobutylene having an average viscosity molecular weight Mv×10 -4 of from about 0.60 to 1.40 and from 60 to 40 parts by weight of at least one rubber selected from the group consisting of butyl rubber, chlorinated butyl rubber and brominated butyl rubber having a raw Mooney viscosity (ML 1+8 at 212° F.) of from about 18 to 75 and an unsaturation of from about 0.6 to 2.5 mol %, said tape exhibiting a peel strength of at least about 2.5 pli at about 158° F. against said membranes.
Claim 2
Dependent Claim
137 words
A laminate comprising two cured, carbon black reinforced rubbery EPDM membranes joined together at their primed seams by a seaming tape comprising a lightly cured to a low cross-link density, carbon black reinforced, compounded, tacky and rubbery composition comprising from about 40 to 60 parts by weight of polyisobutylene having an average viscosity molecular weight Mv×10 -4 of from about 0.60 to 1.40 and from 60 to 40 parts by weight of at least one rubber selected from the group consisting of butyl rubber, chlorinated butyl rubber and brominated butyl rubber having a raw Mooney viscosity (ML 1+8 at 212° F.) of from about 18 to 75 and an unsaturation of from about 0.6 to 2.5 mol %, said tape exhibiting a peel strength of at least about 2.5 pli at about 158° F. against said membranes.
Claim 3
Dependent Claim
81 words
A laminate according to claim 1 where the EPDM of said membranes contains ethylene in an amount of from about 62 to 85%, where the non-conjugated diene in the EPDM is 1,4-hexadiene and where the EPDM has a raw Mooney viscosity (ML 1+8 at 250° F.) of from about 14 to 84 and where said rubber is butyl rubber having an unsaturation of about 1.5 mol % and a Mooney viscosity (ML 1+8 at 212° F.) from about 40 to 60.
Claim 4
Dependent Claim
20 words
A laminate according to claim 1 where the seams of said EPDM membranes have been solvent washed prior to priming.
Claim 5
Dependent Claim
15 words
A laminate according to claim 1 where said EPDM membranes are single ply roofing membranes.
Claim 6
Dependent Claim
20 words
A laminate according to claim 1 where a quinoid curing system has been used to lightly cure said rubbery composition.
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) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |