Polyurea gel compositions and articles therefrom
AssigneeRaychem Corporation
InventorsJames A. Rinde, Frank W. Mercer, Keith Dawes, Rudolf R. Bukownik
Life of this patent
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Abstract
Crosslinkable gel compositions cure rapidly to provide gel compositions which possess superior combinations of chemical and physical properties and aging resistance. These compositions are particularly useful for environmentally protecting substrates, especially electrical conductors, connectors, and splices and for sealing around jacketed cables, for example where they enter splice cases.
Claims40
A composition which comprises a crosslinked polyurea and which has a Voland hardness of from 1 to 500 g. and an ultimate elongation of at least 50%.
A method of making a crosslinked polyurea composition having a Voland hardness of from 1 to 500 g and an ultimate elongation of at least 50%, comprising the step of reacting together
- (1) a first organic compound containing amine groups;
- and
- (2) an second organic compound containing isocyanate groups or isocyanate precursor groups;
- in the presence of a diluent, which is inert to reaction with the first organic compound and inert to reaction with the second organic compound, in an amount of from at least 25% by weight to 95% by weight of the combined weights of the first organic compound, the second organic compound and the diluent.
A method of protecting a substrate, comprising
- (1) providing a composition comprising a crosslinked polyurea having a Voland hardness of from 1 to 500 g and an ultimate elongation of at least 50%;
- and
- (2) applying the composition to the substrate.
A kit comprising at least two containers, each of said containers comprising at least one material selected from the group consisting of:
- (1) a first organic compound containing amine groups;
- (2) an second organic compound containing isocyanate groups or isocyanate precursor groups;
- and
- (3) a diluent which is inert to reaction with the first organic compound and inert to reaction with the second organic compound, the total amount of the diluent in the containers being from 25% by weight to 95% by weight of the combined weights of the first and second organic compounds and the diluent in the containers;
- the division of materials between the containers being such that the first organic compound and the second organic compound are stable when the containers are maintained at room temperature (25.degree. C.) under dry conditions for 6 months;
- the contents of the containers when mixed and fully cured providing a crosslinked polyurea gel which has a Voland hardness of from 1 to 500 g. and an ultimate elongation of at least 50%.
A crosslinkable composition which when fully cured has a Voland hardness of from 1 to 500 g and an ultimate elongation of at least 50% and which comprises a first organic compound containing amine groups, a second organic compound containing isocyanate or isocyanate precursor groups, and a diluent in an amount from 25% by weight to 95% by weight of the combined weights of the first organic compound, the second organic compound and the diluent.
A method of protecting a substrate, which comprises placing on the substrate a mixture comprising:
- (1) a first organic compound containing amine groups;
- (2) an second organic compound containing isocyanate groups or isocyanate precursor groups;
- and
- (3) a diluent, which is inert to reaction with the first organic compound and with the second organic compound, in an amount of from at least 25% by weight to 95% by weight;
- and
- curing the mixture.
A method for preparing a composition of predetermined dielectric constant, comprising:
- (A) selecting a blend of diluents each of which exhibits a dielectric constant different from any other of the diluents selected, the weight ratios of the diluents being chosen such that the blend has a desired dielectric constant;
- and
- (B) incorporating said blend into a composition comprising a crosslinked polyurea gel in an amount such that the composition exhibits the desired dielectric constant.
Dependencies are inferred from the claim text.