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US 11,447,614 B2Granted
Combination of silica and graphite and its use for decreasing the thermal conductivity of vinyl aromatic polymer foam
AssigneeSynthos S.A.
InventorsFilip Lukasz Kondratowicz, Piotr Rojek, Marzena Mikoszek-Operchalska, Kamil Utrata
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Abstract
The invention relates to the co-use of a) a certain type of silica and b) a certain type of graphite, wherein the silica and the graphite are used in a weight ratio in a range of from 1:1 to 1:10, for decreasing the thermal conductivity of vinyl aromatic polymer foam.
Claims22
Expanded polymer foam comprising a) silica, b) graphite and c) vinyl aromatic polymer, wherein
- a) the silica is amorphous and has
- a BET surface of from 1 to 100 m2/g,
- an average particle size in a range of from 3 nm to 1,000 nm, and
- the silica is present in an amount of from 0.01 to less than 2 wt. %, based on the weight of the polymer (inclusive of solid and, if any, liquid additives), and
- b) the graphite has
- a carbon content in a range of from 50 to 99.99 wt. % and
- a particle size in a range of from 0.01 to 100 μm, and
- the graphite is present in an amount in a range of from 0.01 to 10 wt. %, based on the weight of the vinyl aromatic polymer (inclusive of solid and, if any, liquid additives),
- wherein the silica and the graphite are present in a weight ratio in a range of from 1:1 to 1:10,
- the foam having
- a density of 8 to 30 kg/m3, and
- a thermal conductivity of 25−35 mW/K•m.
9 more elements
A process for preparing a polymer foam, comprising expanding an expandable polymer granulate, the granulate comprising one or more propellants, a) silica, b) graphite and c) vinyl aromatic polymer, wherein
- a) the silica is amorphous and has
- a BET surface of from 1 to 100 m2/g,
- an average particle size in a range of from 3 nm to 1,000 nm, and
- the silica is present in an amount of from 0.01 to less than 2 wt. %, based on the weight of the polymer (inclusive of solid and, if any, liquid additives, but exclusive of propellant), and
- b) the graphite has
- a carbon content in a range of from 50 to 99.99 wt. % and
- a particle size in a range of from 0.01 to 100 μm, and
- the graphite is present in an amount in a range of from 0.01 to 10 wt. %, based on the weight of the vinyl aromatic polymer (inclusive of solid and, if any, liquid additives, but exclusive of propellant)
- wherein the silica and the graphite are present in a weight ratio in a range of from 1:1 to 1:10.
6 more elements
Dependencies are inferred from the claim text.