US3956217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latex setting materials
Assignee: Malaysian Rubber Producers Research Association
•
Filing: 1974-05-29
•
Granted: 1976-05-11
•
Expires: 1994-05-29
Abstract
Abstract Self-setting products, having utility in sealing pipe-joints, are made by mixing a latex of natural or synthetic rubber and a sensitising agent therefor with a copolymerizable unsaturated organic monomer, and initiating polymerisation of the monomer for example by means of a redox catalyst syatem so as to gel the latex and cause the product to set.
Inventors
- 👤 Keith Frederick Gazeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:04
CPC Classifications
C; C08; C08F; C08F253/00; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A method of making a set product, which method comprises: a. providing a fluid composition comprising: a latex of natural or synthetic rubber, from 1.5 to 15 pphr by weight of a stabilizer for the latex, from 20 to 200 pphr by weight of a polymerizable ethylenically unsaturated organic material comprising at least one monomer which will polymerize in the presence of the latex, selected from styrene and acrylic and methacrylic monomers, from 2 to 20 pphr by weight of a heat sensitizer for the latex selected from the group consisting of polyoxyalkylene diols and polyvinyl methyl ethers, the composition containing not more than 50% by weight of water, and b. initiating polymerization of the polymerizable unsaturated organic material at ambient temperature so as to cause the composition to form a set product.
Claim 2
Independent Claim
133 words
A method of making a set product, which method comprises: a. providing a fluid composition comprising: a latex of natural or synthetic rubber, from 1.5 to 15 pphr by weight of a stabilizer for the latex, from 20 to 200 pphr by weight of a polymerizable ethylenically unsaturated organic material comprising at least one monomer which will polymerize in the presence of the latex, selected from styrene and acrylic and methacrylic monomers, from 2 to 20 pphr by weight of a heat sensitizer for the latex selected from the group consisting of polyoxyalkylene diols and polyvinyl methyl ethers, the composition containing not more than 50% by weight of water, and b. initiating polymerization of the polymerizable unsaturated organic material at ambient temperature so as to cause the composition to form a set product.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, wherein the polymerisable unsaturated organic material includes a minor proportion of an unsaturated polyester resin to stiffen the set product.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 1, wherein polymerisation of the polymerisable unsaturated organic material is initiated by incorporating a catalyst system in the fluid composition.
Claim 5
Dependent Claim
42 words
A method as claimed in claim 3, wherein the catalyst system is a redox catalyst system comprising an organic peroxide or hydroperoxide and activator selected from the group consisting of tetraethylene pentamine, sodium formaldehyde sulphoxylate, sodium bissulphite, potassium bissulphite and mixtures thereof.
Claim 6
Dependent Claim
42 words
A method as claimed in claim 1, wherein the fluid composition includes an amount of 10 to 200 pphr by weight of a plasticiser or extender for the rubber selected from the group consisting of light mineral oils and principally saturated hydrocarbons.
Claim 7
Independent Claim
138 words
A method of making a set product, which method comprises: a. providing a fluid composition comprising: a latex of natural or synthetic rubber, from 1.5 to 15 pphr by weight of a stabilizer for the latex, from 20 to 200 pphr by weight of a polymerizable ehtylenically unsaturated organic material comprising at least one monomer which will polymerize in the presence of the latex, selected from styrene and acrylic and methacrylic monomers, from 10 to 200 pphr by weight of a plasticizer or extender for the rubber selected from the group consisting of light mineral oils and processing oils comprising principally saturated hydrocarbons, the composition containing not more than 50% by weight of water, and b. initiating polymerization of the polymerizable unsaturated organic material at ambient temperature so as to cause the composition to form a set product.
Claim 8
Independent Claim
138 words
A method of making a set product, which method comprises: a. providing a fluid composition comprising: a latex of natural or synthetic rubber, from 1.5 to 15 pphr by weight of a stabilizer for the latex, from 20 to 200 pphr by weight of a polymerizable ehtylenically unsaturated organic material comprising at least one monomer which will polymerize in the presence of the latex, selected from styrene and acrylic and methacrylic monomers, from 10 to 200 pphr by weight of a plasticizer or extender for the rubber selected from the group consisting of light mineral oils and processing oils comprising principally saturated hydrocarbons, the composition containing not more than 50% by weight of water, and b. initiating polymerization of the polymerizable unsaturated organic material at ambient temperature so as to cause the composition to form a set product.
Claim 9
Dependent Claim
144 words
A two-component mixture consisting of Components A and B, in which: Component A contains
(in part by weight unless
otherwise stated):
Natural or synthetic rubber latex
100
Surfactant 1.5 to 15
Activator part of redox catalyst system
0.05 to 3.0
Component B contains
Styrene or acrylic monomer
20 to 200 pphr
Plasticiser or extender
0. to 200 pphr
selected from the group consisting
of light mineral oils and
principally saturated hydrocarbons
Peroxide part of redox catalyst system
0.3% to 5.0% of monomer
Heat sensitizer for rubber latex
0 to 20 pphr
selected from the group consisting
of polyoxyalkylene diols
and polyvinyl methyl ethers Components A and B being formulated to provide, on mixing, a fluid composition containing not more than 50% by weight of water which gels in not more than 24 hours after mixing at ambient temperature to form a coherent set product.
Claim 10
Dependent Claim
144 words
A two-component mixture consisting of Components A and B, in which: Component A contains
(in part by weight unless
otherwise stated):
Natural or synthetic rubber latex
100
Surfactant 1.5 to 15
Activator part of redox catalyst system
0.05 to 3.0
Component B contains
Styrene or acrylic monomer
20 to 200 pphr
Plasticiser or extender
0. to 200 pphr
selected from the group consisting
of light mineral oils and
principally saturated hydrocarbons
Peroxide part of redox catalyst system
0.3% to 5.0% of monomer
Heat sensitizer for rubber latex
0 to 20 pphr
selected from the group consisting
of polyoxyalkylene diols
and polyvinyl methyl ethers Components A and B being formulated to provide, on mixing, a fluid composition containing not more than 50% by weight of water which gels in not more than 24 hours after mixing at ambient temperature to form a coherent set product.
Claim 11
Dependent Claim
142 words
A two component mixture consisting of Components A and B, in which: Component A contains
(in parts by weight unless
otherwise stated)
Natural or synthetic rubber latex
100
Surfactant 1.5 to 15
Activator part of redox catalyst system
0.05 to 3.0
Plasticiser or extender
0. to 200 pphr
selected from the group consisting
of light mineral oils and
principally saturated hydrocarbons
Component B contains
Styrene or acrylic monomer
20 to 200 pphr
Peroxide part of redox catalyst system
0.3% to 5% of monomer
Sensitising agent for rubber latex
0 to 20 pphr
selected from the group consisting
of polyoxyalkylene diols
and polyvinyl methyl ethers Components A and B being formulated to provide, on mixing, a fluid composition containing not more than 50% by weight of water which gels in not more than 24 hours after mixing to form a coherent set product.
Claim 12
Dependent Claim
142 words
A two component mixture consisting of Components A and B, in which: Component A contains
(in parts by weight unless
otherwise stated)
Natural or synthetic rubber latex
100
Surfactant 1.5 to 15
Activator part of redox catalyst system
0.05 to 3.0
Plasticiser or extender
0. to 200 pphr
selected from the group consisting
of light mineral oils and
principally saturated hydrocarbons
Component B contains
Styrene or acrylic monomer
20 to 200 pphr
Peroxide part of redox catalyst system
0.3% to 5% of monomer
Sensitising agent for rubber latex
0 to 20 pphr
selected from the group consisting
of polyoxyalkylene diols
and polyvinyl methyl ethers Components A and B being formulated to provide, on mixing, a fluid composition containing not more than 50% by weight of water which gels in not more than 24 hours after mixing to form a coherent set product.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |