US3996142A
Expired / Lapsed
US
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Smoke and fire retardants for halogen-containing plastic compositions comprising the reaction product of magnesium oxide and a zinc salt of an acid
Assignee: COOKSON MINERALS Ltd UTTOXETER ROAD MEIR STOKE-ON-TRENT ST3 7XS UNITED KINGDOM A Co OF UNITED KINGDOM
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Filing: 1974-12-11
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Granted: 1976-12-07
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Expires: 1994-12-11
Abstract
Abstract Magnesium oxide and a zinc salt are reacted with one another to form a magnesium zinc complex salt which is added to a halogen-containing plastic composition to serve as a smoke and/or fire retardant during combustion of the plastic. This magnesium-zinc complex salt is normally added along with an antimony compound but may be used alone if desired.
Inventors
- 👤 Edward L. White
- 👤 William E. Robertson
- 👤 Joseph Schwarcz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:29
CPC Classifications
C; C09; C09K; C09K21/00; C09K21/02; C08; C08K; C08K3/00; C08K3/01; C08K3/016; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
52 words
A composition of matter comprising a magnesium-zinc reaction product, said composition prepared by slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 2
Dependent Claim
52 words
A composition of matter comprising a magnesium-zinc reaction product, said composition prepared by slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 3
Dependent Claim
17 words
Composition according to claim 1 in which the acid in the zinc salt is an inorganic acid.
Claim 4
Dependent Claim
17 words
Composition according to claim 1 in which the acid in the zinc salt is an organic acid.
Claim 5
Dependent Claim
45 words
Composition according to claim 1 in which an inorganic zinc salt is employed and is selected from the group consisting of zinc sulfate, zinc borate, zinc phosphate, zinc phosphite, zinc fluoborate, zinc orthophosphate, zinc sulfite, zinc fluosilicate, zinc silicate and zinc sulfamate and mixtures thereof.
Claim 6
Dependent Claim
53 words
Composition according to claim 1 in which an organic zinc salt is imployed and is selected from the group consisting of zinc trimellitate, zinc pyromellitate, zinc terephthalate, zinc fumarate, zinc phthalate, zinc maleate, zinc salicylate, zinc gluconate, zinc tartrate, zinc isophthalate, zinc orthophthalate, zinc adipates, zinc glutamates and zinc lactate and mixtures thereof.
Claim 7
Dependent Claim
49 words
Method for preparation of a magnesium-zinc reaction product which comprises slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 8
Dependent Claim
49 words
Method for preparation of a magnesium-zinc reaction product which comprises slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 9
Dependent Claim
97 words
Method for retarding smoke and fire in a halogen-containing polymer composition which comprises adding a magnesium-zinc reaction product to the components of said polymer composition during formulation thereof, said reaction product added in amounts in the range of from about 0.2 to about 20 parts per hundred parts by weight of said polymer, said reaction product prepared by slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 10
Dependent Claim
97 words
Method for retarding smoke and fire in a halogen-containing polymer composition which comprises adding a magnesium-zinc reaction product to the components of said polymer composition during formulation thereof, said reaction product added in amounts in the range of from about 0.2 to about 20 parts per hundred parts by weight of said polymer, said reaction product prepared by slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 11
Dependent Claim
12 words
Method according to claim 7 wherein the polymer composition is polyvinyl chloride.
Claim 12
Dependent Claim
11 words
Method according to claim 7 wherein the polymer composition is polystyrene.
Claim 13
Dependent Claim
11 words
Method according to claim 7 in which the polymer is polypropylene.
Claim 14
Dependent Claim
20 words
Method according to claim 7 in which an antimony compound is also added as a component in said polymer composition.
Claim 15
Dependent Claim
116 words
A normally combustible article of manufacture characterized by minimal smoking and burning, said article of manufacture comprising a halogen-containing polymer composition, said polymer composition having a smoke and fire retardant incorporated therein comprising a magnesium-zinc reaction product in an amount in the range of from about 0.2 to about 20 parts per hundred parts polymer resin, said reaction product containing from 2 to 10 moles of magnesium for each mole of zinc, said reaction product prepared by slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 16
Dependent Claim
116 words
A normally combustible article of manufacture characterized by minimal smoking and burning, said article of manufacture comprising a halogen-containing polymer composition, said polymer composition having a smoke and fire retardant incorporated therein comprising a magnesium-zinc reaction product in an amount in the range of from about 0.2 to about 20 parts per hundred parts polymer resin, said reaction product containing from 2 to 10 moles of magnesium for each mole of zinc, said reaction product prepared by slurrying from 2 to 10 moles of magnesium oxide in an aqueous solution containing 1 mole of a zinc salt of an acid, filtering the precipitate and heating the precipitate to dryness at a temperature of about 100° C.
Claim 17
Dependent Claim
17 words
Composition according to claim 12 in which the acid in the complex salt is an inorganic acid.
Claim 18
Dependent Claim
17 words
Composition according to claim 12 in which the acid in the complex salt is an organic acid.
Claim 19
Dependent Claim
15 words
Composition according to claim 12 in which said polymer composition also contains an antimony compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |