US4824512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low viscosity, pregelable rubber-based adhesives
Assignee: Henkel AG and Co KGaA
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Filing: 1987-07-24
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Granted: 1989-04-25
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Expires: 2007-07-24
Abstract
Abstract Rubber based adhesives containing liquid stereospecific polybutadiene rubber, one or more hardeners or hardener systems, fillers and optionally primers, which contain one or more chemically irreversibly depolymerized solid rubbers of natural or synthetic origin in quantities of from 1.5 to 5% by weight, based on the sum of the constituents, to a process for the production of these low-viscosity rubber-based adhesives by chemically irreversible depolymerization of one or more solid rubbers of natural or synthetic origin, and to the use of these low-viscosity rubber-based adhesives in the bonding of metal components in automotive manufacturing.
Inventors
- 👤 Hans-Peter Kohlstadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:51
CPC Classifications
C; C09; C09J; C09J109/00; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
94 words
A rubber-based adhesive composition comprising: (a) from about 20 to about 60% by weight of liquid stereospecific polybutadiene rubber; (b) from about 1.5 to about 5% by weight of one or more chemically irreversibly depolymerized solid rubbers of natural or synthetic origin; (c) from about 0.5 to about 15% by weight of one or more hardeners; (d) from about 25 to about 70% by weight of one or more fillers; (e) from 0 to about 8% by weight of one or more primers; and (f) from 0 to about 12% by weight of sulfur.
Claim 2
Dependent Claim
94 words
A rubber-based adhesive composition comprising: (a) from about 20 to about 60% by weight of liquid stereospecific polybutadiene rubber; (b) from about 1.5 to about 5% by weight of one or more chemically irreversibly depolymerized solid rubbers of natural or synthetic origin; (c) from about 0.5 to about 15% by weight of one or more hardeners; (d) from about 25 to about 70% by weight of one or more fillers; (e) from 0 to about 8% by weight of one or more primers; and (f) from 0 to about 12% by weight of sulfur.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein component (e) is present in from about 1 to about 8% by weight.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein component (f) is present in from about 2 to about 12% by weight.
Claim 5
Dependent Claim
19 words
The composition of claim 2 wherein component (f) is present in from about 2 to about 12% by weight.
Claim 6
Dependent Claim
16 words
The composition of claim 1 wherein component (a) has from about 40 to about 95% 1,4-configuration.
Claim 7
Dependent Claim
13 words
The composition of claim 5 wherein more than about 80% has the 1,4-configuration.
Claim 8
Dependent Claim
20 words
The composition of claim 5 wherein the molecular weight is in the range of from about 1000 to about 8000.
Claim 9
Dependent Claim
21 words
The composition of claim 1 wherein component (b) has a viscosity of from 2000 P to 20,000 P at 20° C.
Claim 10
Dependent Claim
19 words
The composition of claim 8 wherein component (b) is one or more chemically irreversibly depolymerized solid stereospecific cis-1,4-butadiene rubber.
Claim 11
Dependent Claim
16 words
The composition of claim 1 wherein component (b) is a chemically irreversibly depolymerized solid natural rubber.
Claim 12
Dependent Claim
11 words
The composition of claim 1 wherein component (c) is dibenzothiazyl disulfide.
Claim 13
Dependent Claim
28 words
The composition of claim 1 wherein component (c) is a two-stage hardener containing N-cyclohexyl-2-benzothiazyl sulfenamide and 2-mecaptobenzothiazole for the first stage and diorthotolyl quanidine for the second stage.
Claim 14
Dependent Claim
23 words
The composition of claim 1 wherein component (d) is at least one of zinc oxide, calcium oxide, silica, magnesium-aluminum silicates and carbon black.
Claim 15
Dependent Claim
77 words
The composition of claim 13 wherein component (d) contains from about 1 to about 4% by weight of zinc oxide, from about 3 to about 8% by weight of calcium oxide, from about 1 to about 5% by weight of silica, from 20 to about 50% by weight of magnesium-aluminum silicate, and from about 0.5 to about 2% by weight of carbon black, the percentages by weight being based on the total weight of the adhesive composition.
Claim 16
Dependent Claim
15 words
The composition of claim 1 wherein component (e) is present and is a phenol-cresol resin.
Claim 17
Dependent Claim
81 words
A process for the preparation of the rubber-based adhesives of claim 1 comprising the steps of A. chemically irreversibly depolymerizing one or more solid rubbers of natural or synthetic origin to a viscosity of from about 2000 P to about 20,000 P at 20° C., B. optionally dissolving the resulting depolymerized rubber in component (a), and C. mixing the depolymerized rubber from step A or the solution thereof from step B with the remaining components to form a homogeneous rubber mixture.
Claim 18
Dependent Claim
20 words
A process of claim 16 wherein the solid rubber of step A prior to depolymerizing is a stereospecific cis-1,4-butadiene rubber.
Claim 19
Dependent Claim
19 words
The process of claim 16 wherein in step A the solid rubber before depolymerizing is a solid natural rubber.
Claim 20
Dependent Claim
23 words
The process of claim 16 wherein step A is carried out at a temperature of from about 120° C. to about 150° C.
Claim 21
Dependent Claim
14 words
The process of claim 16 wherein step A is carried out on friction rolls.
Claim 22
Dependent Claim
16 words
The process of claim 16 wherein step A is carried out in an internal floating-weight kneader.
Claim 23
Dependent Claim
18 words
The process of claim 21 wherein step A is carried out in the presence of a depolymerization accelerator.
Claim 24
Dependent Claim
15 words
The process of claim 22 wherein the depolymerization accelerator is the zinc salt of pentachlorothiophenol.
Claim 25
Dependent Claim
16 words
A method of bonding metal in motor vehicles comprising applying thereto the composition of claim 1.
Claim 26
Dependent Claim
22 words
The process of claim 24 wherein the bonding is for the purpose of filling gaps and/or sealing joints in the motor vehicles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |