US4451615A
Expired / Lapsed
US
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Polyisoprene toughened adhesive composition
Assignee: Henkel Loctite Ireland Ltd
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Filing: 1983-03-16
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Granted: 1984-05-29
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Expires: 2003-03-16
Abstract
Abstract A structurally toughened heat resistant adhesive composition comprising a solution of polyisoprene elastomer in polymerizable acrylate ester monomers. The adhesive composition also contains an adhesion promoter, a cross-linking agent, a free-radical generator and a free-radical accelerator. The adhesive compositions are generally used as two-part systems, and yield bonds with improved heat and solvent resistant properties. The polymerizable acrylate ester monomers may be monofunctional or a combination of mono- and polyfunctional monomers. Among the useful classes of monomers are alkyl and cycloalkyl acrylates, alkyl and cycloalkyl methacrylates, alkoxy acrylates and methacrylates, alkylene diacrylates and dimethacrylates. A few of the preferred monomers are methyl methacrylate, lauryl methacrylate, isobornyl methacrylate, and tetrahydrofurfuryl methacrylate. The preferred polyisoprene rubbers are generally copolymers (or block copolymers) of (i) isoprene with styrene, acrylonitrile, or methacrylonitrile; (ii) homopolymers of polyisoprene; or (iii) copolymers of either (i) or (ii) with a functional monomer; or (iv) mixtures of the above. Most preferred are the homopolymers of isoprene.
Inventors
- 👤 Ronald S. Charnock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:28
CPC Classifications
C; C09; C09J; C09J4/00; C09J4/06; C08; C08F; C08F279/00; C08F279/02; C08F287/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
In a two-component adhesive composition of the type having a first component comprising a solution of polymer in at least one polymerizable monomer in combination with an adhesion promoter and a free radical catalyst system, and a second component comprising an activator, an improved composition providing increased high temperature resistance in the cured adhesive wherein: said polymer is present at levels of 20% or more of the total composition and is selected from the class of isoprene block copolymer rubbers having a molecular weight in excess of 5,000; and said monomer is an acrylate ester.
Claim 2
Dependent Claim
95 words
In a two-component adhesive composition of the type having a first component comprising a solution of polymer in at least one polymerizable monomer in combination with an adhesion promoter and a free radical catalyst system, and a second component comprising an activator, an improved composition providing increased high temperature resistance in the cured adhesive wherein: said polymer is present at levels of 20% or more of the total composition and is selected from the class of isoprene block copolymer rubbers having a molecular weight in excess of 5,000; and said monomer is an acrylate ester.
Claim 3
Dependent Claim
43 words
The composition of claim 1, wherein the acrylate ester monomer is selected from the class consisting of monofunctional monomers represented by the formula: ##STR6## wherein R 1 is H, CH 3 or lower alkyl; R 2 is alkyl, cycloalky, alkylhydroxy, alkylene or tetrahydrofurfuryl.
Claim 4
Dependent Claim
30 words
The composition of claim 2, wherein the acrylate ester monomer is selected from the group consisting of methyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.
Claim 5
Dependent Claim
39 words
The composition of claim 1, wherein the acrylate ester monomer is a mixture of mono- and poly-functional acrylates and wherein the polyfunctional acrylate is present in amounts of between about 1% and 40% by weight of the total composition.
Claim 6
Dependent Claim
29 words
The composition of claim 4, wherein the monofunctional acrylate is selected from the group consisting of methyl methacrylate and cyclohexyl methacrylate and the polyfunctional acrylate is a glycol dimethacrylate.
Claim 7
Dependent Claim
17 words
The composition of claim 1, wherein the elastomeric rubber is a block copolymer of isoprene and styrene.
Claim 8
Dependent Claim
17 words
The composition of claim 1, wherein the elastomeric rubber is a block copolymer of isoprene and acrylonitrile.
Claim 9
Dependent Claim
17 words
The composition of claim 1, wherein the elastomeric rubber is a block copolymer of isoprene and methacrylonitrile.
Claim 10
Dependent Claim
14 words
The adhesive composition of claim 1, wherein the activator is an aldehyde-amine condensation product.
Claim 11
Dependent Claim
13 words
The adhesive composition of claim 9, wherein the aldehyde-amine condensation product is butyraldehyde-aniline.
Claim 12
Dependent Claim
23 words
The adhesive composition of claim 9, wherein the second component consists of a solution of said aldehyde-amine condensation product in an inert solvent.
Claim 13
Dependent Claim
15 words
The composition of claim 1, wherein the second component further comprises a free-radical polymerizable component.
Claim 14
Dependent Claim
21 words
The adhesive composition of claim 1, wherein the adhesion promoter is selected from the group consisting of acrylic and methacrylic acid.
Claim 15
Dependent Claim
13 words
The adhesive composition of claim 1, wherein the adhesion promoter is a silane.
Claim 16
Dependent Claim
40 words
The adhesive composition of claim 1, wherein the composition when cured and aged at a temperature of 180° C. for 24 hours shows increased shear strength when compared to the shear strength of the composition when cured at room temperature.
Claim 17
Independent Claim
123 words
A method of bonding a pair of substrates comprising applying a composition comprising: a first component comprising a solution of polymer in at least one polymerizable monomer in combination with an adhesion promoter and a free radical catalyst system, and a second component comprising an activator, said composition being an improved composition providing increased high temperature resistance in the cured adhesive wherein: said polymer is present at levels of 20% or more of the total composition and is selected from the class of isoprene block copolymer rubbers having a molecular weight in excess of 5,000 and said monomer in an acrylate ester, to at least one of the substrates and joining the two substrates for sufficient time to permit the composition to cure.
Claim 18
Independent Claim
123 words
A method of bonding a pair of substrates comprising applying a composition comprising: a first component comprising a solution of polymer in at least one polymerizable monomer in combination with an adhesion promoter and a free radical catalyst system, and a second component comprising an activator, said composition being an improved composition providing increased high temperature resistance in the cured adhesive wherein: said polymer is present at levels of 20% or more of the total composition and is selected from the class of isoprene block copolymer rubbers having a molecular weight in excess of 5,000 and said monomer in an acrylate ester, to at least one of the substrates and joining the two substrates for sufficient time to permit the composition to cure.
References Cited (Backward Citations)
US3300547A
Cited
US3757828A
Cited
US4138449A
Cited
US4155950A
Cited
US4181635A
Cited
US4287317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |