US4200480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive joining of pipes
Assignee: Pratt and Lambert Inc
•
Filing: 1977-11-07
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Granted: 1980-04-29
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Expires: 1997-11-07
Abstract
Abstract Pipe sections of polyester fiberglass, epoxy fiberglass or of other diverse or same materials are adhesively joined together or to reaction vessels by applying to one mating surface an adhesive composition comprising a solution of non-reactive elastomer as for example, butadieneacrylonitrile rubber dissolved in a mixture of polymerizable acrylic monomers and acrylic acid monomer such as methyl methacrylate and acrylic acid, containing a polymerization catalyst such as benzoyl peroxide, and applying to the other mating surface a tertiary amine activator, bringing the mating surfaces together and allowing the adhesive to cure to a set. In another embodiment the tertiary amine is encapsulated in a rupturable microsphere and dispersed in the adhesive composition. The microspheres may be ruptured before or after the adhesive is applied.
Inventors
- 👤 Leon E. Wolinski
- 👤 Peter D. Berezuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:01
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; B; B29; B29C; B29C65/00; B29C65/48; B29C65/4805; B29C65/483; B29C65/485; B29C66/00; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; C08; C08F; C08F283/00; C08F291/00; C08L; C08L33/00; C09J4/00; C09J4/06; F; F16; F16L; F16L13/00; F16L13/10; F16L13/103; B29C66/70; B29C66/71; Y; Y10; Y10S; Y10S138/00; Y10S138/01; Y10S285/00; Y10S285/919; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/31504; Y10T428/31536
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
220 words
A method for joining a pipe section with at least one end having a first mating surface, said section adapted to be joined to another element having a second mating surface adapted to fit together with and be joined to the first mating surface, applying to at least one of said mating surfaces a free radical polymerization catalyst activator, applying to at least one of said mating surfaces an activatable, curable adhesive comprising a solution of a non-reactive elastomeric polymer resin member selected from the group consisting of homopolymers of butadiene and lower alkyl substituted butadienes, copolymers of styrene or acrylonitrile or methylmethacrylate with butadiene or lower alkyl substituted butadienes, carboxy modified acrylonitrilebutadiene copolymers, neoprene, butyl rubber, silicones other than dimethyl silicone, polysulfide rubber, pyridinebutadiene copolymer, chlorosulfonated polyethylene, polyethers of epichlorhydrin, and the said polymers and copolymers having vinyl group-containing monomers grafted thereon, said member being dissolved in a free radical addition polymerizable acrylic monomer and a free radical addition polymerizable acid monomer co-polymerizable with said acrylic monomer, said solution containing a catalytically effective amount of a non-activated free radical addition polymerization catalyst having a half-life of at least about one-half hour at 85° C., joining said mating surfaces in a contact relationship and activating the polymerization catalyst, and maintaining said contact relationship until said adhesive cures to a set.
Claim 2
Independent Claim
220 words
A method for joining a pipe section with at least one end having a first mating surface, said section adapted to be joined to another element having a second mating surface adapted to fit together with and be joined to the first mating surface, applying to at least one of said mating surfaces a free radical polymerization catalyst activator, applying to at least one of said mating surfaces an activatable, curable adhesive comprising a solution of a non-reactive elastomeric polymer resin member selected from the group consisting of homopolymers of butadiene and lower alkyl substituted butadienes, copolymers of styrene or acrylonitrile or methylmethacrylate with butadiene or lower alkyl substituted butadienes, carboxy modified acrylonitrilebutadiene copolymers, neoprene, butyl rubber, silicones other than dimethyl silicone, polysulfide rubber, pyridinebutadiene copolymer, chlorosulfonated polyethylene, polyethers of epichlorhydrin, and the said polymers and copolymers having vinyl group-containing monomers grafted thereon, said member being dissolved in a free radical addition polymerizable acrylic monomer and a free radical addition polymerizable acid monomer co-polymerizable with said acrylic monomer, said solution containing a catalytically effective amount of a non-activated free radical addition polymerization catalyst having a half-life of at least about one-half hour at 85° C., joining said mating surfaces in a contact relationship and activating the polymerization catalyst, and maintaining said contact relationship until said adhesive cures to a set.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the adhesive solution comprises an acrylonitrile-butadiene rubber dissolved in methyl methacrylate and acrylic acid monomers and the polymerization catalyst is benzoyl peroxide.
Claim 4
Dependent Claim
63 words
The method of claim 1 wherein the activator comprises a tertiary amine of the formula R 1 R 2 R 3 N 1 wherein R 1 and R 2 are lower alkyl and R 3 is phenyl, tolyl or xylyl; the adhesive solution comprises a non-reactive elastomeric polymer dissolved in methyl methacylate and acrylic acid monomers and the polymerization catalyst is benzoyl peroxide.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein said pipe section and the said other element are of the same composition.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said pipe section and the said other element are of diverse compositions.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein the said other element is a pipe section.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein the said other element is a pipe section.
Claim 9
Dependent Claim
25 words
The method of claim 4 wherein said pipe section and said other element are selected from the class consisting of epoxy fiberglass and polyester fiberglass.
Claim 10
Dependent Claim
14 words
The method of claim 8 wherein the said other element is a pipe section.
Claim 11
Dependent Claim
29 words
The method of claim 2 wherein said other element is a pipe section and both pipe sections are selected from the class consisting of epoxy fiberglass and polyester fiberglass.
Claim 12
Independent Claim
252 words
A method for joining a pipe section with at least one end having a first mating surface, said section adapted to be joined to another element having a second mating surface adapted to fit together with and be joined to the first mating surface, applying to at least one of said mating surfaces a free radical polymerization catalyst activator, applying to at least one of said mating surfaces an activatable, curable adhesive comprising a solution of a non-reactive elastomeric polymer resin member selected from the group consisting of homopolymers of butadiene and lower alkyl substituted butadienes, copolymers of styrene or acrylonitrile or methylmethacrylate with butadiene or lower alkyl substituted butadienes, carboxy modified acrylonitrilebutadiene copolymers, neoprene, butyl rubber, silicones other than dimethyl silicone, polysulfide rubber, pyridinebutadiene copolymer, chlorosulfonated polyethylene, polyethers of epichlorhydrin, and the said polymers and copolymers having vinyl group-containing monomers grafted thereon, said member being dissolved in a free radical addition polymerizable acrylic monomer and a free radical addition polymerizable acid monomer co-polymerizable with said acrylic monomer, said solution containing a catalytically effective amount of a non-activated free radical addition polymerization catalyst having a half-life of at least about one-half hour 85° C., said solution having dispersed therein rupturable microspheres encapsulating a free radical polymerization activator whereby to form an adhesive dispersion, in any order applying to at least one of said mating surfaces the adhesive dispersion and rupturing the microspheres joining said mating surfaces in a contact relationship and maintaining the contact relationship until the adhesive cures to a set.
Claim 13
Independent Claim
252 words
A method for joining a pipe section with at least one end having a first mating surface, said section adapted to be joined to another element having a second mating surface adapted to fit together with and be joined to the first mating surface, applying to at least one of said mating surfaces a free radical polymerization catalyst activator, applying to at least one of said mating surfaces an activatable, curable adhesive comprising a solution of a non-reactive elastomeric polymer resin member selected from the group consisting of homopolymers of butadiene and lower alkyl substituted butadienes, copolymers of styrene or acrylonitrile or methylmethacrylate with butadiene or lower alkyl substituted butadienes, carboxy modified acrylonitrilebutadiene copolymers, neoprene, butyl rubber, silicones other than dimethyl silicone, polysulfide rubber, pyridinebutadiene copolymer, chlorosulfonated polyethylene, polyethers of epichlorhydrin, and the said polymers and copolymers having vinyl group-containing monomers grafted thereon, said member being dissolved in a free radical addition polymerizable acrylic monomer and a free radical addition polymerizable acid monomer co-polymerizable with said acrylic monomer, said solution containing a catalytically effective amount of a non-activated free radical addition polymerization catalyst having a half-life of at least about one-half hour 85° C., said solution having dispersed therein rupturable microspheres encapsulating a free radical polymerization activator whereby to form an adhesive dispersion, in any order applying to at least one of said mating surfaces the adhesive dispersion and rupturing the microspheres joining said mating surfaces in a contact relationship and maintaining the contact relationship until the adhesive cures to a set.
Claim 14
Dependent Claim
55 words
The method of claim 11 wherein the non-reactive polymer is dissolved in methyl methacrylate and acrylic acid monomers, the polymerization catalyst is benzoyl peroxide, the activator is a tertiary amine R 1 R 2 R 3 N wherein R, and R 2 are lower alkyl radicals and R 3 is phenyl or tolyl or xylyl.
Claim 15
Dependent Claim
13 words
The method of claim 12 wherein the non-reactive polymer is an acrylonitrile-butadiene rubber.
Claim 16
Dependent Claim
36 words
The method of claim 11 wherein the adhesive dispersion is applied to at least one of said mating surfaces and joining said surfaces together in a contact relationship with a force sufficient to rupture the microspheres.
Claim 17
Dependent Claim
30 words
The method of claim 12 wherein the said other element is a pipe section and both pipe section are selected from the class consisting of epoxy giberglass and polyester fiberglass.
Claim 18
Dependent Claim
35 words
The method of claim 11 comprising first rupturing the microspheres in the dispersion then applying resultant adhesive composition to at least one of said mating surface, and joining said surfaces together in a contact relationship.
Claim 19
Dependent Claim
26 words
The method of claim 1, wherein the adhesive contains, in addition, up to 20% of an exoxide resin not reactive with any of the other components.
Claim 20
Dependent Claim
26 words
The method of claim 11, wherein the adhesive contains, in addition, up to 20% of an exoxide resin not reactive with any of the other components.
Claim 21
Dependent Claim
14 words
The method of claim 1, wherein the catalyst is activated by a tertiary amine.
Claim 22
Dependent Claim
14 words
The method of claim 11, wherein the catalyst is activated by a tertiary amine.
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |