Patent US4251430A successfully refreshed from Google Patents.
US4251430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire resistant additive for hardenable resin compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1978-12-08
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Granted: 1981-02-17
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Expires: 1998-12-08
Abstract
Abstract A hardenable resin composition (or a component thereof) containing as a fire retardant ingredient particulate aluminium hydroxide wherein 10 to 30% by weight of the particles have a diameter less than 1 micron, 45 to 75% by weight of the particles have a diameter in the range from 38 to 150 microns and less than 20% by weight of the particles have a diameter in the range from 1 to 38 microns. The invention includes a preferred blend of aluminium hydroxide.
Inventors
- 👤 Henry K. Kennedy-Skipton
- 👤 Thomas Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:24
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L67/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
84 words
Hardenable resin compositions containing unsaturated polyester resin hardenable by means of a peroxide catalyst, crosslinking monomer and containing, as an additive to enhance their fire resistance, particulate aluminium hydroxide wherein 12 to 33% by weight of the particles have a diameter less than 1 micron, 45 to 75% by weight of the particles have a diameter in the range from 38 to 150 microns and less than 20% by weight of the particles have a diameter in the range from 1 to 38 microns.
Claim 2
Dependent Claim
84 words
Hardenable resin compositions containing unsaturated polyester resin hardenable by means of a peroxide catalyst, crosslinking monomer and containing, as an additive to enhance their fire resistance, particulate aluminium hydroxide wherein 12 to 33% by weight of the particles have a diameter less than 1 micron, 45 to 75% by weight of the particles have a diameter in the range from 38 to 150 microns and less than 20% by weight of the particles have a diameter in the range from 1 to 38 microns.
Claim 3
Dependent Claim
121 words
Compositions according to claim 1 wherein the aluminium hydroxide is in the form of a blend of a coarse grade and a fine grade of particulate aluminium hydroxide; said coarse grade having an average particle diameter of 50 to 100 microns and containing less than 10% by weight of particles having a diameter less than 5 microns and at least 90% by weight of particles having a diameter less than 150 microns; said fine grade having average particle diameter of 0.4 to 0.8 microns and containing at least 80% by weight of particles having a diameter of less than 1 micron; and the ratio of coarse grade to fine grade in the said blend being in the range 2:1 to 5.6:1.
Claim 4
Dependent Claim
32 words
A composition as claimed in claim 1 wherein the polyester resin comprises a condensation product of propylene glycol and a compound selected from the group consisting of maleic anhydride and phthalic anhydride.
Claim 5
Dependent Claim
16 words
A composition as claimed in claim 3 wherein the crosslinking monomer comprises styrene or vinyl toluene.
Claim 6
Dependent Claim
13 words
A composition as claimed in claim 1 comprising an aromatic amine as promoter.
Claim 7
Dependent Claim
27 words
A composition as claimed in claim 1 comprising filler selected from the group consisting of calcium carbonate, quartz, china clay, bentonite, chalk, titanium dioxide and mixtures thereof.
Claim 8
Dependent Claim
28 words
A composition as claimed in claim 1 characterised in that the amount of aluminium hydroxide is in the range from 40 to 80% by weight of the composition.
Claim 9
Independent Claim
108 words
A method of improving the fire resistance of hardenable resin compositions containing cross-linking monomer and unsaturated polyester resin hardenable by means of a peroxide catalyst and of improving the fire resistance of components of such resin compositions in which method there is mixed with the said resin composition or component particulate aluminium hydroxide wherein 12 to 33% by weight of the particles have a diameter less than 1 micron, 45 to 75% by weight of the particles have a diameter in the range from 38 to 150 microns and less than 20% by weight of the particles have a diameter in the range from 1 to 38 microns.
Claim 10
Independent Claim
108 words
A method of improving the fire resistance of hardenable resin compositions containing cross-linking monomer and unsaturated polyester resin hardenable by means of a peroxide catalyst and of improving the fire resistance of components of such resin compositions in which method there is mixed with the said resin composition or component particulate aluminium hydroxide wherein 12 to 33% by weight of the particles have a diameter less than 1 micron, 45 to 75% by weight of the particles have a diameter in the range from 38 to 150 microns and less than 20% by weight of the particles have a diameter in the range from 1 to 38 microns.
Claim 11
Dependent Claim
117 words
A method according to claim 8 wherein the aluminium hydroxide is in the form of a blend of a coarse grade and a fine grade; said coarse grade having an average particle diameter of 50 to 100 microns and containing less than 10% by weight of particles having a diameter less than 5 microns and at least 90% by weight of particles having a diameter less than 150 microns; said fine grade having average particle diameter of 0.4 to 0.8 microns and containing at least 80% by weight of particles having a diameter of less than 1 micron; and the ratio of coarse grade to fine grade in the blend being in the range 2:1 to 5.6:1.
Claim 12
Dependent Claim
130 words
A blend of particulate aluminium hydroxide effective to improve the fire resistance of hardenable resins and hardener components for resin compositions, the blend consisting of a coarse grade and a fine grade of particulate aluminium hydroxide; said coarse grade having an average particle diameter of 50 to 100 microns and containing less than 10% by weight of particles having a diameter of less than 5 microns and at least 90% by weight of particles having a diameter of less than 150 microns; said fine grade having average particle diameter of 0.4 to 1.8 microns and containing at least 80% by weight of particles having a diameter of less than 1 micron; and the ratio of coarse grade to fine grade in the blend being in the range 2:1 to 5.6:1.
Claim 13
Dependent Claim
130 words
A blend of particulate aluminium hydroxide effective to improve the fire resistance of hardenable resins and hardener components for resin compositions, the blend consisting of a coarse grade and a fine grade of particulate aluminium hydroxide; said coarse grade having an average particle diameter of 50 to 100 microns and containing less than 10% by weight of particles having a diameter of less than 5 microns and at least 90% by weight of particles having a diameter of less than 150 microns; said fine grade having average particle diameter of 0.4 to 1.8 microns and containing at least 80% by weight of particles having a diameter of less than 1 micron; and the ratio of coarse grade to fine grade in the blend being in the range 2:1 to 5.6:1.
Claim 14
Dependent Claim
92 words
A hardener component for hardening a polyester resin composition, the component containing a peroxide catalyst for hardening the resin composition, a liquid dispersant for the catalyst and, as an additive to enhance fire resistance, particulate aluminium hydroxide wherein 12 to 33% by weight of the particles have a diameter less than 1 micron, 45 to 75% by weight of the particles have a diameter in the range from 38 to 150 microns and less than 20% by weight of the particles have a diameter in the range from 1 to 38 microns.
Claim 15
Dependent Claim
92 words
A hardener component for hardening a polyester resin composition, the component containing a peroxide catalyst for hardening the resin composition, a liquid dispersant for the catalyst and, as an additive to enhance fire resistance, particulate aluminium hydroxide wherein 12 to 33% by weight of the particles have a diameter less than 1 micron, 45 to 75% by weight of the particles have a diameter in the range from 38 to 150 microns and less than 20% by weight of the particles have a diameter in the range from 1 to 38 microns.
Claim 16
Dependent Claim
123 words
A hardener component as in claim 11 wherein the aluminium hydroxide is in the form of a blend of a coarse grade and a fine grade of particulate aluminium hydroxide; said coarse grade having an average particle diameter of 50 to 100 microns and containing less than 10% by weight of particles having a diameter less than 5 microns and at least 90% by weight of particles having a diameter less than 150 microns; said fine grade having average particle diameter of 0.4 to 0.8 microns and containing at least 80% by weight of particles having a diameter of less than 1 micron; and the ratio of coarse grade to fine grade in the said blend being in the range 2:1 to 5.6:1.
Claim 17
Dependent Claim
14 words
A hardener component as in claim 11 wherein the active hardener comprises benzoyl peroxide.
Claim 18
Dependent Claim
28 words
A hardener component as in claim 13 wherein the benzoyl peroxide is dispersed in a paste with dispersant, said paste also containing inorganic filler and said aluminium hydroxide.
Claim 19
Dependent Claim
23 words
A hardener component as in claim 11 wherein the amount of aluminium hydroxide is in the range from 40 to 80% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |