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US 3,956,217 AGranted
Latex setting materials
AssigneeThe Malaysian Rubber Producers' Research Association
InventorKeith Frederick Gazeley
Life of this patent
Estimating the term…
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.
Claims8
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.
4 more elements
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.
4 more elements
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.
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.
Dependencies are inferred from the claim text.