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US 6,187,829 B1Granted
Heat gellable latex composition and method of making same
AssigneeTextile Rubber & Chemical Company, Inc.
InventorAlan P. Sellers
Life of this patent
Estimating the term…
Abstract
There is disclosed a heat-gellable latex composition. The composition comprises a curable natural or synthetic elastomeric latex, an amount of a curing agent sufficient to cure the latex, an amount of ammonia sufficient to prevent gellation of the latex, an amount of a gelling agent sufficient to gell the latex, the gelling agent comprising the reaction product of zinc chloride and an ammonium-containing compound, and an amount of an accelerator sufficient to accelerate vulcanization of the latex, the accelerator comprising a zinc dithiocarbamate. A method for heat-gelling a latex composition is also disclosed.
Claims13
A foamable composition comprising:
- a vulcanizable latex rubber dispersion;
- an amount of a vulcanizing agent sufficient to vulcanize said latex rubber;
- an amount of ammonia sufficient to prevent gellation of said latex rubber;
- an amount of a gelling agent sufficient to gell said latex rubber upon removal of a sufficient amount of ammonia from said composition, said gelling agent comprising the reaction product of zinc chloride and an ammonium-containing compound;
- and
- an amount of an accelerator sufficient to accelerate vulcanization of said latex rubber, said accelerator comprising a zinc dithiocarbamate.
3 more elements
A foamable composition comprising:
- a vulcanizable latex rubber dispersion;
- approximately 1-5 parts by weight of a vulcanizing agent;
- at least 0.3 parts by weight ammonia;
- approximately 0.5-2 parts by weight zinc ammonium chloride;
- and
- approximately 0.5-5 parts by weight of a zinc dithiocarbamate.
3 more elements
A foamable composition comprising:
- a vulcanizable latex rubber dispersion;
- approximately 1-5 parts by weight sulfur;
- at least 0.3 parts by weight ammonia;
- approximately 0.5-2 parts by weight zinc ammonium chloride;
- and
- approximately 0.5-5 parts by weight zinc dibenzyl dithiocarbamate.
3 more elements
A method comprising the steps of:
- heating a foamable composition for a time sufficient to cause gellation, said composition comprising:
- a vulcanizable latex rubber dispersion;
- an amount of a vulcanizing agent sufficient to vulcanize said latex rubber;
- an amount of ammonia sufficient to prevent gellation of said latex rubber;
- an amount of a gelling agent sufficient to gell said latex rubber upon removal of a sufficient amount of ammonia, said gelling agent comprising the reaction product of zinc chloride and an ammonium-containing compound;
- and
- an amount of an accelerator sufficient to accelerate vulcanization of said latex rubber, said accelerator comprising a zinc dithiocarbamate.
4 more elements
A method comprising the steps of:
- frothing a composition to form a foam, said composition comprising:
- a vulcanizable latex rubber dispersion;
- an amount of a vulcanizing agent sufficient to vulcanize said latex rubber;
- an amount of ammonia sufficient to prevent gellation of said latex rubber;
- an amount of a gelling agent sufficient to gell said latex rubber upon removal of a sufficient amount of ammonia, said gelling agent comprising the reaction product of zinc chloride and an ammonium-containing compound;
- and
- an amount of an accelerator sufficient to accelerate vulcanization of said latex rubber, said accelerator comprising zinc dithiocarbamate;
- heating said frothed composition for a period of time to cause coagulation of said latex.
5 more elements
A one-part foamable latex composition which may be stored for extended periods of time prior to foaming, which composition comprises:
- a natural or synthetic elastomeric latex subject to cure;
- a curing system which comprises an ammonia-retarded dithiocarbamate accelerating agent, which agent is inhibited in accelerating function in the presence of ammonia;
- ammonia in an amount sufficient to inhibit the cure of the latex;
- a gelling agent comprising zinc ammonium chloride in an amount sufficient to gell the latex upon removal of a sufficient amount of ammonia from said composition;
- and
- a frothing agent in an amount sufficient to permit mechanical frothing of the composition into a foam.
3 more elements
A method comprising the steps of:
- heating a composition for a time sufficient to cause gellation, said composition comprising:
- a natural or synthetic elastomeric latex subject to cure;
- a curing system which comprises an ammonia-retarded dibenzyl dithiocarbamate accelerating agent, which agent is inhibited in accelerating function in the presence of ammonia;
- ammonia in an amount sufficient to inhibit the cure of the latex;
- a gelling agent comprising zinc ammonium chloride in an amount sufficient to gell the latex upon removal of a sufficient amount of ammonia from said composition;
- and
- a frothing agent in an amount sufficient to permit mechanical frothing of the composition into a foam.
4 more elements
A method of making an embossed latex foam product comprising:
- forming a foam by mechanically frothing a composition comprising:
- a natural or synthetic elastomeric latex subject to cure;
- a curing system which comprises an ammonia-retarded dithiocarbamate accelerating agent, which agent is inhibited in accelerating function in the presence of ammonia;
- ammonia in an amount sufficient to inhibit the cure of the latex;
- a gelling agent comprising zinc ammonium chloride in an amount sufficient to gell the latex upon removal of a sufficient amount of ammonia;
- and
- a frothing agent in an amount sufficient to permit mechanical frothing of the composition into a foam;
- forming the frothed composition into a layer;
- heating the frothed composition for a time sufficient to cause coagulation of said latex;
- and
- embossing said layer of frothed foam after it has coagulated, but before it has cured.
8 more elements
Dependencies are inferred from the claim text.